U.S.S. CABRILLA (SS-288) — war patrol report SS-288_CABRILLA.pdf

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START OF REEL
JOB NO. [HANDWRITTEN: AR-302-76]

1.0
1.1
1.25
1.4
1.6

2.8 2.5
3.2 2.2
3.6 2.0
4.0
1.8

OPERATOR [HANDWRITTEN: EDWARDS]
DATE [HANDWRITTEN: 4-12-76]

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION

REEL TARGET, START & END
NAVEXOS 3968

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Cabrilla
An edible fish inhabiting the Mediterranean Sea and
waters off the coast of California.
(SS-288; dp. 1,526; l. 311'9"; b. 27'3"; dr. 15'3"; s.
20 k.; cpl. 66; a. 1 4", 10 21" tt.; cl. Gato)

Cabrilla (SS-288) was launched 24 December 1942
by Portsmouth Navy Yard; sponsored by Mrs. L. B.
Combs; commissioned 24 May 1943, Commander D. T.
Hammond in command; and reported to the Pacific
Fleet.
Cabrilla arrived at Pearl Harbor 30 August 1943, and
cleared on the first of eight war patrols.
After a daring exploit in which four Filipino guerrillas
were taken off Negros Island, Cabrilla completed her
patrol at Fremantle, Australia, her base for the next
five patrols. During her second patrol, Cabrilla laid
mines in the Gulf of Siam, and sank her first Japanese
merchantman, then returned to Fremantle to prepare for
her third patrol, a reconnaissance of Sunda Strait. Her
fourth and fifth patrols, off Makassar, and in the Celebes
and Sulu Seas, found her again striking with telling
results against Japanese merchant shipping. Most suc-
cessful of her patrols was the sixth, in the South China
Sea, from 13 September to 25 October 1944. During this
period, she sank a total of 24,557 tons
of shipping, including a 10,059-ton tanker. Cabrilla made
her seventh war patrol in vicious weather in the Kuriles
and her last patrol found her on
lifeguard duty for aviators downed at sea while carrying
out attacks on Japan.
Homeward-bound after 2 arduous years, Cabrilla
cleared Fremantle 31 August 1945 for the States. Fol-
lowing overhaul at Philadelphia, she sailed for the
Canal Zone for exercises (19 February-17 March 1946),
then underwent preinactivation overhaul at Philadel-
phia. Cabrilla was placed out of commission in reserve
7 August 1946.
Cabrilla received six battle stars for World War II
service. Of her eight patrols, six were designated as
"Successful War Patrols." She is credited with having
sunk a total of 38,767 tons of shipping.

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SS288/A12-1
Serial 015
CONFIDENTIAL
[STAMP: DECLASSIFIED]

From:
To:
Via:
Subject:

Enclosure:

1. U.S.S. CABRILLA (SS288)
c/o Fleet Post Office
San Francisco, Calif.

6 November 1943

The Commanding Officer.
The Commander in Chief, U.S. Fleet.
Official Channels.
U.S.S. CABRILLA (SS288), report of War Patrol
number one.

(A) Subject report.

Enclosure (A), covering the first war patrol of
this vessel, conducted in the vicinity of San Bernardino and
Surigao Straits, in Mindanao Sea, Panay Gulf, and approaches
to Iloilo and Guimaras Straits, during the period 12 September
1943 to 6 November 1943, is forwarded herewith.

[SIGNATURE: D.T. Hammond]
D.T. HAMMOND.

DECLASSIFIED NLT 0445, OPNVINST 5510.1C
BY [HANDWRITTEN: OP-09B9C] DATE [HANDWRITTEN: 5/2/72]
[STAMP: DECLASSIFIED]

62133 [STAMP: FILMED]

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SS288/A12-1
Serial 015
CONFIDENTIAL

U.S.S. CABRILLA (SS288)

Report of First War Patrol.

(A) Prologue

11 June 1943. Completed and delivered by Portsmouth Navy Yard,
Portsmouth, N.H.

12-13 June 1943. Commissioning period at Portsmouth Navy Yard,
Portsmouth, N.H.

June 1943. Commenced trials, shakedown and training period.

1-31 July 1943. Granted special availability for installation of
chrome plated liners in main engines.

1 August 1943. Completed trials, and forty- two day training and
shakedown period.

2-30 August 1943. Enroute New London, Conn. to Pearl Harbor, T.H.
Conducted training dives, fire control drills, tracking
exercise problems, emergency drills, and battle surface
drills while enroute. Fueled and made minor repairs in
Panama.

31 August-11 September 1943. In Pearl Harbor area. Made minor
voyage repairs. Installed third 20 MM mount aft and deck
lockers for one 20 MM gun and ammunition, and two fifty
caliber machine guns and ammunition. Conducted special
sound listening tests on trim pump for comparison with
experimental pump installed in U.S.S. SKATE. Conducted
training exercises for a period of six days which included
torpedo firing and simulated day and night attacks on in-
bound convoy. The convoy exercise was considered to be
extremely valuable.

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288/A12-1
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CONFIDENTIAL

(A) Narrative

U.S.S. CABRILLA (SS288)

12 September 1943
1300 VW Departed Pearl for assigned area via Midway. Surface es-
          cort until dark.

12-16 September 1943
Enroute Midway - conducted daily dives and training.
Sighted several friendly planes enroute.

16 September 1943
0530 Y Contacted air escort.
0755 Y Moored starboard side U.S.S. TULLIBEE, at Submarine Base,
          Midway.
1734 Y Departed Midway for patrol areas, having received 13,650
          gallons of fuel, and effected minor repairs.
2400 Y Changed time to (minus) 12 and date to 18th.

16-21 September 1943
Enroute on assigned track to patrol areas. Conducting
daily training dives and drills.

18 September 1943
Underway on surface.

19 September 1943
Underway on surface.

20 September 1943
Underway on surface.

21 September 1943
1830 Y Changed time to zone (minus) 11.

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SS288/A12-1
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CONFIDENTIAL
U.S.S. CARRILLA (SS288)

21 September 1943
Underway on surface.
0019 L Radar contact at approximately 8,000 yards. Turned out
to be first experience with radar contact on rain squall.

22 September 1943
Underway on surface. Made training dive.

23 September 1943
Underway on surface. Made training dive.
1300 L Changed time to zone (minus) 10.

24 September 1943
Underway on surface.
0528 K Submerged.
0727 K Sighted mast bearing 151 1/2 (T), estimated range 22,000
yards. Commenced approach.
0735 K Identified ship as a destroyer.
0740 K Sighted two auxiliary aircraft carriers in column. DD was
patrolling approximately 2,000 yards ahead of leading
carrier. The two carriers appeared to be about the same
size. Estimated length 600 feet, displacement 17,000
tons. The upper works of the leading one resembled the
KAGA class, having four-stick masts and small bridge
structure. The second one, which was attacked, had four-
stick masts and no bridge structure - similar to RYUJO
except that flight deck extended farther forward. Planned
to fire bow tubes at leading one on sharp track and attempt
to bring stern tubes to bear on second one for a large
track angle shot. Maneuvers to keep clear of escort, which
passed down the starboard side at about 500 yards range,
plus high speed of the task force, estimated to be twenty
knots, made things happen too fast and had to settle for
sharp track on second carrier.

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BS283/A12-1
Serial 015
CONFIDENTIAL                                                                U.S.S. CABRILLA (SS288)

    0800 K      Position Lat 27-57 N      Long 146-07 E

    0801 K      Commenced firing a spread of six torpedoes at eight second
                intervals. Range 1,000 yards, average track 65 starboard.

    0801:34 K   Heard first explosion.

    0801:39 K   Heard second explosion.

                The times of explosions checked approximately for estimated
                run of first and second torpedoes. The DD on the starboard
                bow and ahead of the carrier was being observed at the time
                of the explosions and hits were not observed. Commenced
                maneuvering to bring stern tubes to bear after firing sixth
                bow tube.

    0803 K      Sound picked up fast screws close aboard on the port beam
                and almost simultaneously a very loud explosion which shook
                the boat a bit was heard. Interpreted this to be a second
                escort, which had been suspected but not sighted, starting
                a depth charge attack, or bomb dropped by aircraft, and
                immediately ordered deep submergence and rigged for depth
                charge. As it turned out, this was probably a mistake
                which prevented firing the stern tubes since only one ex-
                plosion was heard at this time. It was later decided that
                this explosion could have been on board the carrier.

    0806 K      at 375 feet, commenced silent running and evasion to south-
                westward.

    0813 K      Received three depth charges.

    0852 K      Received two depth charges.

    0900 K      Received four depth charges.

    1005 K      Heard distant explosion.

    1008 K      Distant explosion.

    1030 K      Main induction leaking small amount of water - due to depth
                and not damage by depth charges.

    1037 K      Commenced reload forward and checking torpedoes in after
                tubes.

    1103 K      Distant explosion.

[HANDWRITTEN: (7)]                                                                -4-                                                                 [HANDWRITTEN: 5]

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SS286/A12-1
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CONFIDENTIAL
U.S.S. CABRILLA (SS288)

1109 K Finished reload forward. Had difficulty with #7 tube -
        torpedo pulled for inspection could not be reloaded.

1243 K Inner door to #7 tube closed - all tubes loaded and ready.
        Started up to periscope depth. Venting negative and pumping
        which had been flooded in to get through a
        temperature layer at 170 feet, made the trip back up a long
        and hard one.

1315 K Reached periscope depth.

1316 K Sighted DD bearing 038 T, range about 12,000 yards.

1324 K Sighted carrier bearing 036 T, range about 16,000 yards -
        in the approximate position of attack. Carrier was well
        down by the stern and apparently stopped. DD was searching
        between us and carrier.

330 K Commenced approach. Sighted sea plane circling in vicinity
        of damaged carrier.

1400 K Sighted plane at estimated range of 2,000 yards on bow
        zero. Went deep for bombing, or to avoid being sighted if
        not already located.

1420 - 1425 K On way back to periscope depth, sound picked up loud
        screws on constant bearing 328 relative. Depth control was
        poor as periscope depth was reached and had to flood nega-
        tive at 60 feet on the way up without having a look. Screws
        drew rapidly across bow and suddenly stopped bearing 015
        relative. Believed plane had coached DD on again, went deep
        and commenced evading.

1500 K Decided DD was not in contact or that he had no more depth
        charges and started back to periscope depth.

1535 K Reached periscope depth and sighted both carriers bearing
        016 T, distance about 14,000 yards and one DD patrolling
        between us and carriers. Thought the second one would be
        well on the way to Tokyo by this time. The damaged carrier
        was close astern of the other one - either in tow or at slow
        speed under own power. Due to distances to possible aid,
        had assumed up until this time that there was plenty of time
        to finish the damaged one off since he had not moved appreci-
        ably in seven hours, and had considered the problem to be a
        matter of reaching firing range without being detected.
        Estimated enemy course 250, speed 5 knots. Went to normal
        approach course.

[HANDWRITTEN: (10)]
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LS283/A12-1
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CONFIDENTIAL

U.S.S. GABRIEL (SS263)

1606 K Lost sight of carriers in rain squall. Then last seen
        one or more planes were still circling.

1650 K Good visibility and carrier still not sighted. They must
        have been getting underway when sighted at 1535 K and had
        increased speed or had made a radical change in course.
        They were probably headed in the direction of Chichi
        Jima, which was the closest possible anchorage, (approxi-
        mately 190 miles). Decided to remain submerged until after
        sunset to avoid planes and then make night search in that
        direction.

1840 K Surfaced and commenced radar search in direction of Chichi
        Jima.

2300 K Sent serial one to Comsubpac telling of attack and search.

2340 K Decided original base course had probably been resumed in
        rain squall or after dark and that the force was headed for
        Tokyo. Had the damaged carrier been in tow on the assumed
        course, contact should have been established by this time.
        Since speed was too great to regain position ahead
        before daylight attack. Gave up search and proceeded to
        assigned area.

25 September 1943

        Underway on surface enroute to assigned area.

0924 K SD radar contact, range 7 miles. Submerged without sighting
        plane.

0927 K Received one bomb while passing 200 feet on the way down.

1015 K Heard four depth bombs at intervals of about fifteen seconds.
        Plane was apparently dropping around diving point or along
        assumed track.

1130 K Came to periscope depth.

1210 K Sighted smoke bearing 280 T, commenced approach.

1228 K Sighted mast, estimated range 20,000 yards.
        Lat 25-27 N Lon 144-07 E

1234 K Sighted mast of second ship.

1238 K Sighted seaplane circling around the two ships.

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(D)                                                               7

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SS238/A12-1
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CONFIDENTIAL
U.S.S. CABRILLA (SS288)

1250 K Smokin ship appeared to be small freighter with PC type
        escort. Still had not seen much except sharp angles on bow
        and lots of smoke.

1304 K Targets had zigged and identified smoker as a trawler type
        AS ship of about 1,000 tons - mast, stack, mast - one fore
        and two aft. The "escort" was a PC type AS vessel.
        Range and speed had been greatly overesti-
        mated. First became suspicious when it was observed that
        the trawler was not smokin regularly, but would occasion-
        ally let out a heavy puff.

1305 K Secured approach and began evasion.
        These two alone with a plane searched in the immediate vi-
        cinity for the rest of the day. The search moved gradually
        to the southwest along the track of CABRILLA since using
        radio the night before and at the time the plane put us
        down. Do not understand how they arrived so quickly after
        aircraft attacked, since the nearest possible base was ap-
        proximately 150 miles away.

1355 K Surfaced. Trawler and patrol boat last sighted at 1800
        and were not in sight upon surfacing.

2006 K Sent serial two Consubpao reporting negative results on
        night search for task force.

                                26 September 1943

        Underway on surface.

0622 K Submerged. Decided to avoid possible mornin air search
        since it would be possible to run submerged for six hours
        and still reach desired position prior to sunset.

1129 K Surfaced

1900 K Lat 21-00 N                 Long 141-35 E
        Commenced patrollin on course 347 T.

                                27 September 1943

        Underway on surface - patrollin on course 347 T. Made
        trainin dive.

1015 K Lat 21-25 N                 Long 141-25 E
        Proceedin to area in accordance with operation order -
        slightly north of assigned track.

1630 K Changed time to zone (minus) 9.

                                -7-
[HANDWRITTEN: (12)]

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B3238/A12-1
Serial 015
CONFIDENTIAL

U.S.S. CABRILLA (SS288)

28 September 1943

Underway on surface. Made training dive.

0901 I Passed to Command of Commander Task Force Seventy-one with-
          out serial in accordance with operation order.
          Last serial from Comsubpac #89 K
          First serial from Commander Task Force 71 #9.

2113 I Received serial 14 - welcoming message from Commander
          Task Force 71.

29 September 1943

Underway on surface. Held training dives and drills. Dis-
          covered air leaks into #2 MBT.

1700 I Lat 15-20 N Long 130-00 E
          Entered area 305. Proceeding to approaches to Port Jose
          Panganiban.

30 September 1943

Underway on surface. Held training dive and drills.

1700 I Changed time to zone (minus) 8.

1 October 1943

Underway on surface.

0500 H Attempting to make land fall on Polillo Islands and fix
          position. Heavy rain squalls toward Luzon and generally
          foul visibility.

0531 H Sighted small fishing boat and submerged - may have been
          a native fishing fleet by DR, one star sight, probable
          fishing area around a six fathom bank, and soundings -
          Lat 14-52 N Long 122-39 E
          Patrolling on east-west line to intercept possible North-
          bound traffic from Port Jose Panganiban and Lamon Bay.
          Intend to patrol north of Jesus Point tomorrow if position
          can be fixed accurately enough to go in to observe for both
          northbound traffic and traffic via Polillo Strait.

1005 H Visibility improving - sighted small island bearing 172 T.

1100 H Three low lying islands visible but unable to identify and
          fix position. Visibility still not good.

[HANDWRITTEN: 13]
[HANDWRITTEN: 310 I]                                                              -8-
                                                                        [HANDWRITTEN: 9]

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S288/.12-1
Serial 015
CONFIDENTIAL
U.S.S. CABRILLA (SS288)

1748 H Surfaced. Overcast and heavy squalls to the west. Con-
sidered possible traffic route to the north from Port Jose
had been covered for one day and that to attempt to
station during the night close enough to observe Port Jose
under existing visibility conditions would not be justified.
Decided to spend no more time here and proceeded to Legaspi-
San Bernardino Strait area.

1800 H NH fathometer head grounded out.

2 October 1943

Underway on surface - proceeding to San Bernardino -
Legaspi area.

0450 H Sighted Catanduanes Island, bearing - 215 T, distance about
15 miles.

0519 H Fixed position and submerged.

Conducted submerged patrol along 100 fathom curve on east
coast of Catanduanes Island. Heavy rain squalls throughout
the day. Position in doubt.

1802 H Surfaced.

3 October 1943

Patrolling on surface attempting to reach entrance to Albay
Gulf. Heavy rain squalls and extremely poor visibility
continue. Unsatisfactory attempt made to use QC as fatho-
meter.

0538 H Submerged, position still in doubt.

1746 H Surfaced.

4 October 1943

Patrolling on surface.

0527 H Submerged. Position still in doubt. Heavy rain practically
continuous throughout day. Air conditioning system out of
commission for half of day due to electrical trouble. Until
now air conditioning had not been properly appreciated.

1751 Surfaced.

[HANDWRITTEN: 14]
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[HANDWRITTEN: 10]

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S1250/A12-1
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CONFIDENTIAL

U.S.S. CABRILLA (SS288)

5 October 1943

Patrolling on surface. Rain and poor visibility continues.

0200 H SJ radar out of commission.

0456 H Submerged. Patrolling approaches to Albay Gulf and San
        Bernardino Strait.

0700 H Visibility improving. Fixed position for the first time in
        three days.

1809 H Surfaced.

6 October 1943

Patrolling approaches to San Bernardino Strait and Legaspi
on surface.

0119 H Received Contaskfor 71 serial 29 assigning special mission.

0434 H Submerged. Small sailboats in sight off Bingay Point,
        Luzon throughout the day.

1821 H Surfaced.

7 October 1943

Patrolling approaches to San Bernardino Strait and Legaspi
on surface. SJ radar back in commission.

0435 H Submerged.

0834 H Sighted small, single mast, high stack trawler bearing
        256 T. Lat 12-58 N Long 124-13 E
        Could not close range sufficiently to determine whether
        or not it was an armed patrol boat but it was of the same
        type as used for such purposes in this area.

0900 H Trawler rounded Bingay Point close inshore and entered
        Albay Gulf.

        Small sail boats sighted during the day between Bingay
        Point and Port Gubat, Luzon.

1815 H Surfaced.

[HANDWRITTEN: ⑤]
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[HANDWRITTEN: 11]

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H 236/A12-1
Serial 013
CONFIDENTIAL
U.S.S. CABRILLA (SS288)

8 October 1943
Patrolling approaches to San Bernardino Strait and Legaspi
on surface.
0433 H Submerged.
1042 H Sighted two small vessels of about 100 tons each. They
passed close to Bingay Point and Rapu Rapu Island Light
and on to the north towards Catanduanes Island. These two
were suitable gun targets but decided against giving away
our position as we had two more days in this vicinity and
still hoped for a torpedo target.
Small sail boats in sight during the day off Bingay Point.
1815 H Surfaced.

9 October 1943
Patrolling approaches to San Bernardino Strait and Legaspi
on surface.
0435 H Submerged.
Small sail boats in sight throughout the day.
1815 H Surfaced. Departed San Bernardino area for Surigao Strait.
Sent serial one to Contaskfor 71 acknowledging assignment
of special mission.
2015 H Received Contaskfor 71 serial 42 concerning special mission.

10 October 1943
Enroute Surigao Strait on surface.
0440 H Submerged off east coast of Samar Island.
1741 H Surfaced.
2300 H Commenced transit of Surigao Strait.

11 October 1943
Transiting Surigao Strait on surface.
0316 H Sighted sail boat close aboard off Binit Point, Panaon
Island and avoided.

[HANDWRITTEN: (16)]
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SS288/A12-1
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CONFIDENTIAL

U.S.S. CABRILLA (SS288)

0345 H Cleared Surigao Strait.
0422 H Submerged - patrolling approaches to Surigao Strait.
1803 H Surfaced.
2055 H Sighted sail boat and avoided.

12 October 1943

Underway on surface enroute to daylight position south of
Siaton Point, Negros.
0434 H Submerged - patrolling southwest of Siaton Point.
0950 H Sighted sail boat on southeasterly course along coast of
Negros.
1809 H Surfaced.

13 October 1943

Patrolling on surface southwest of Siaton Point, Negros.
0436 H Submerged. Patrolling on Cebu-Davao route and enroute
to possible shipping route from Linapacan Strait to
Basilan Strait or Tapiantana Channel.
1310 H Surfaced.

14 October 1943

Underway on surface - enroute to possible track of ship-
ping south through Linapacan Strait.
0200 H On desired track patrolling on surface.
0447 H Submerged.
1800 H Surfaced patrolling towards Linapacan Strait.
2200 H Enroute Panay Gulf.

15 October 1943

Underway on surface enroute Panay Gulf.

[HANDWRITTEN: 17]
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[HANDWRITTEN: 13]

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SS288/A12-1
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CONFIDENTIAL
U.S.S. CABRILLA (SS288)

0437 H Submerged. Patrolling southwest of Naso Point, Panay.

1610 H Sighted smoke bearing 313 T. Commenced approach.
      Lat 10-28 N Long 121-45 E.

1703 H Above contact identified as two small armed trawlers of
      about 500 tons each standing toward Naso Point, Panay on
      a southeasterly course. Small guns mounted forward and
      aft. These two were either AS vessels or mine sweepers.
      Secured approach.

17 H Surfaced.

                  16 October 1943

      Patrolling on surface off Naso Point, Panay.

0444 H Submerged.

1823 H Surfaced.

                  17 October 1943

      Patrolling on surface in Panay Gulf.

0018 H Sighted small boat and evaded.

0435 H Submerged northwest of Sojoton Point, Negros.

1825 H Surfaced.

                  18 October 1943

      Patrolling on surface in Panay Gulf.

0438 H Submerged west of Matatindoc Point, Negros.

1233 H Sighted sail boat on northerly course off Matatindoc Point.

1815 H Surfaced.

                  19 October 1943

      Patrolling on surface off west coast of Negros.

0306 H Sighted sail boat on westerly course.

0430 H Submerged. Plan to make submerged reconnaissance and ac-
      complish special mission today. Several small sail boats
      sighted during the day.

                  -13-
[HANDWRITTEN: (R with a line through it, circled)]
[HANDWRITTEN: 14]

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U.S.S. CABRILLA (SS288)

1812 H Surfaced.

20 October 1943

Patrolling on surface off west coast of Negros.

0436 H Submerged. Sighted several small sail boats during the
        day.

1851 H Surfaced and completed special mission. Separate report
        of reconnaissance and special mission submitted.

21 October 1943

Underway on surface enroute to Surigao Strait.

0444 H Submerged.

1755 H Surfaced.

2326 H Commenced transit of Surigao Strait.

22 October 1943

Underway on Surface in Surigao Strait.

0430 H Cleared Surigao Strait.

0447 H Submerged. Patrolling eastern approaches to Surigao.

1731 H Surfaced. Enroute Fremantle. Fuel and time factors
        will not permit return via Davao in accordance with
        CTF 71 serial 53.

23 October 1943

Enroute Fremantle on surface.

1200 H Submerged.

1730 H Surfaced.

2134 H Radar contact at 9,600 yards. Commenced tracking and
        maneuvering to obtain favorable background for surface
        attack. Sky was overcast and squally with occasional
        lightning flashes.

[HANDWRITTEN: ⑲]
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[HANDWRITTEN: 15]

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SS233/A12-1
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CONFIDENTIAL
U.S.S. CABRILLA (SS288)

2352 H In position for attack although rain squalls had out-
          maneuvered us and the target had the background ad-
          vantage. Target had checked on course 270, speed 8 knots for a
          period of more than two hours. Still had not seen
          target except during flashes of lightning.

2359 H Target showed silhouette of small tanker. Since course
          and speed had been accurately determined, decided to
          accept long range rather than closing in and taking
          chance of being sighted in a flash of lightning.

                                        24 October 1943

          Making surface attack on small tanker.

0002:41 H Lat 5-25 N Long 127-15 E
          Commenced firing a spread of four torpedoes at intervals
          of eight seconds. Range 2500 yards, track angle 65 port.

0004:10 H Loud roar heard on JK on bearing of target.
          Muffled explosions were heard by sound and in all com-
          partments at the following times: 0005:53, 0005:57, and
          0008:11.
          At the time it appeared that one or more hits had definitely
          been obtained but post firing analysis of times changed
          the picture.

0003:30 H Turned away and continued tracking.

0015 H Commenced closing target. Radar tracking indicated that
          he had started zig-zagging but had not slowed.

0040-0050 H Observed target making radical course changes.

0053 H Fired two torpedoes at eight second intervals, range
          2,900 yards, track angle 160 starboard. The firing of
          these two was later regretted but at the time felt sure
          he had been hit and that another hit would stop him.

0058:48 H Heard muffled explosion.

0058: 56 H Heard muffled explosion.

0103 H Target opened fire and fired three rounds, apparently
          firing blind as nothing came near us. Flashless powder
          was not used - bright flashes being observed prior to
          the bang of two of the three shots.
          Retired to make reload and analyze.

[HANDWRITTEN: 20]
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SS288/A12-1
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CONFIDENTIAL

U.S.S. CABRILLA (SS288)

Post Firing Analysis

The only possible hit, based on times of explosions and
estimated torpedo run, was the noise heard on the JK at
.0004:10. It is not likely that explosions were heard at
the end of torpedo runs as the depth of the water was
approximately 2000 fathoms. It is believed that the ex-
plosions heard were depth charges, dropped shortly after
a dud hit or after sighting torpedo wakes.
The course and speed were accurately solved by plot and
TDC and it is believed that two of the four torpedoes
should have hit, and that dud hits were obtained or they
ran under the target. Sea conditions made it inadvisable
to set torpedo depth at less than ten feet.
It is quite likely that the size of the target was
greatly over-estimated. Felt that thirty days since the
last contact might have made us overanxious to shoot at
anything. Decided not to expend anymore torpedoes and
gave it up as a bad job.

0130 H Enroute Fremantle on surface.
0500 H Submerged.
1718 H Surfaced.

25 October 1943

Enroute Fremantle on surface.
0511 H Submerged.
1725 H Surfaced.

26 October 1943

Enroute Fremantle on surface.
0515 H Submerged.
0806 H Sighted flight of four unidentified bombers or trans-
        ports on southeasterly course. Apparently enroute
        Menado to Ambon or Davao to Ambon.
        Position Lat 0-21 N Long 127-52 E
1730 H Surfaced.

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U.S.S. CABRILLA(SS288)

27 October 1943
Enroute Fremantle on surface.
0448 H Submerged.
1748 H Surfaced.

28 October 1943
Enroute Fremantle on surface.
0457 H Submerged.
1800 H Surfaced.

29 October 1943
Enroute Fremantle on Surface.
0449 H Submerged.
1743 H Surfaced.

30 October 1943
Enroute Fremantle on surface.
0457 H Submerged.
1812 H Surfaced.

31 October 1943
Enroute Fremantle on surface.
0502 H Submerged.
1815 H Surfaced.

1 November 1943
Enroute Fremantle on surface. Made trim dive.
0714 H SD radar contact moved in from ten to seven miles. Sub-
merged without sighting plane.
Lat 13-40 S Long 119-10 E
0830 H Surfaced.

[HANDWRITTEN: 22]
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U.S.S. CABRILLA (SS288)

1035 H SD radar contact moved in from ten to nine miles. Sub-
merged without sighting plane.
Lat 14-03 S Long 118-48 E

1816 H Surfaced.

1915 H Sent serial two to CTF 71 giving ETA Fremantle.

2 November 1943

Enroute Fremantle on surface. Made trim dive.

0920 H Radar and sight contact with high wing patrol plane
bearing 142 T, distance eight miles on southerly course.
Submerged.
Lat 16-20 S Long 116-32 E
Plane not identified - similar to U.S.N. PBY or Jap
KAWANISHI type 97 patrol bomber.

1039 H Surfaced..

3 November 1943

Enroute Fremantle on surface. Made trim dive.

4 November 1943

Enroute Fremantle on surface. Made deep dive and located
main induction leak and checked for other leaks.

5 November 1943

Enroute Fremantle on surface.

6 November 1943

Arrived Fremantle 0720 commenced refit.

[HANDWRITTEN: (23)]
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U.S.S. CABRILLA (SS288)

(C) Weather

     1. Generally excellent weather was encountered enroute
Honolulu to San Bernardino in the Philippine area, and enroute
Fremantle, with the exception of considerable low visibility and
squally weather in vicinity of Port Jose, Panganiban and San
Bernardino, and bad surface haze in Molukka Sea.

(D) Tidal Information

     1. Currents encountered were as follows:

Locality                                Drift      Set
Sulu Sea off Naso Pt., Panay            3/4 kt.    Variable
Off Surigao Strait                      1/2 kt.    180º
Off Eastern Mindanao                    1/3 kts.   200º
Lat 4º N Long 127º E                    1.5 kts.   090º
Molukka Sea                             1.0 kt.    100º

(E) Navigational aids

     A powerful fixed white light is located on the hill on
eastern Rapu Rapu Island.

[HANDWRITTEN: 24]
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**CONFIDENTIAL**
**(F) Ship Contacts**

| TIME | DATE | LAT. | LONG. | TYPE | INITIAL RANGE | ESTIMATED COURSE | ESTIMATED SPEED | ESTIMATED HOW CONTACTED REMARKS |
|---|---|---|---|---|---|---|---|---|
| 0727 Sept | 27- | 146- | 05 E | 2 AGV | 20000 YARDS | 310 T | 20 kts | P First attack |
| 1210 Sept | 25 '43 | 27 N | 02 E | one ton AS trawler one PC type AS vessel | 11000 YARDS | ZIG ZAG Course 120 T & 240 T | VARIOUS | P Evidently conducting systematic search for CABRILLA |
| 1703 Oct | 15 '43 | 28 N | 45 E | two small trawlers | 10000 YARDS | Base Course 120 T | 10 kts | Periscope AS patrols or minesweepers |
| 2134 Oct | 23 '43 | 25 N | 30 E | one tanker (about 3000 tons) | 9600 YARDS | Base Course 270 T | 8 k

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U.S.S. CABRILLA (33288)
(G) Aircraft Contacts.

| TIME | DATE | LAT. | LONG. | TYPE | HOW CONTACTED | REMARKS |
|---|---|---|---|---|---|---|
| 1330 | Sept 24 | 28-05 North | 146-00 East | Obs Seaplane | P | Plane sighted periodically as long as carrier in sight |
| 0924 | Sept 25 | 29-31 | 144-03 | Unidenti-fied | Radar | Contact verified by small bomb on way down. |
| 1730 | Sept 25 | 29-30 | 143-58 | Obs Seaplane | P | Circling trawler & PC boat |
| 0806 | Oct 26 | 0-21 | 127-52 | 4 Bombers | Periscope | Heading in a southeasterly direction from Menado to Ambon |
| 0714 | Nov 1 | 1-40 | 119-10 | Unidenti-fied | Radar | Radar contact moved in from 10 to 7 miles. Sub-merged. |
| 1035 | Nov 1 | 1-03 | 118-48 | Unidenti-fied | Radar | Radar contact moved in from 10 to 9 miles. Sub-merged. |
| 0920 | Nov 2 | 0-20 | 116-32 | Unidenti-fied | Sighted & Radar | Similar to USN PBY or KAWANISHI type 97 patrol bomber. On souther-ly course. |
[HANDWRITTEN: 22]
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(H) ATTACK DATA

Time 0801 Date September 24, 1943 Lat 27°-55'N Long 146°-05'E

Description

Ship attacked was an ACV in company with one other
ACV and a FUBUKI type DD. Sound bearings after the at-
tack indicated that another escort might have been
present although only one was sighted. Visibility con-
ditions were excellent and contact was established
through periscope while submerged at an estimated range
of 20,000 yards. The DD was patrolling ahead of the two
carriers in column. Carrier attacked had four stick
masts and no upper works - similar to RYUJO except that
flight deck extended all the way to the bow.

Ships sunk 0
Ships damaged or
probably sunk one 17,00 ton auxiliary carrier.
Damage determined 2 hits heard by sound and through hull in all
by compartments. Target observed dead in water and
down by the stern 7 hours after the attack in the
approximate position of attack.

Target draft 15'
Target course 320°
Target speed 20 kts.
Firing range 1000 yards

Own speed 3 kts.
Own course 190°
Own depth 65'
Angle 60

Type of attack
Submerged at periscope depth. Fired first torpedo
on periscope bearing and all others on TDC generated
bearing. TDC generated bearing checked exactly on
upon firing fourth torpedo.

[HANDWRITTEN: &]
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U.S.S. CABRILLA (SS288)

TORPEDO ATTACK NO. 1

| | #1 | #2 | #3 | #4 | #5 | #6 |
|---|---|---|---|---|---|---|
| Tubes fired | | | | | | |
| Track angles | 50°S | 54°S | 54°S | 57°S | 63°S | 76°S |
| Gyro angles | 10°L | 10°R | 10°R | 10.5°R | 13°R | 22°R |
| Depth set | 10 | 10 | 10 | 10 | 10 | 10 |
| Power | high | high | high | high | high | high |
| Hit or Miss | hit | hit | miss | miss | miss | miss |
| Erratic | no | no | no | no | no | no |
| Mark Torpedo | 14-3A | 14-3A | 14-3A | 14-3A | 14-3A | 14-3A |
| Serial No. | 22388 | 39241 | 25243 | 39210 | 39270 | 39163 |
| Mark Exploder | 6-1 | 6-1A | 6-1A | 6-1A | 6-1A | 6-1A |
| Serial No. | 11997 | 17798 | 10862 | 11920 | 7096 | 12370 |
| Actuation Set | contact | contact | contact | contact | contact | contact |
| Mark Warhead | 16 | 16 | 16 | 16 | 16 | 16 |
| Serial No. | 10467 | 2001 | 1244 | 1791 | 1727 | 1615 |
| Explosive | TPX | TPX | TPX | TPX | TPX | TPX |

Firing Interval 8 sec.
Type spread 40 divergent
Sea conditions slightly choppy
Overhaul activity Submarine Base, Pearl Harbor.
Remarks At least three of the six fired should have hit.
         Reasons for misses other than spread unknown.
         It is possible that there were duds.

-23-

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U.S.S. CABRILLA (SS288)

(H) ATTACK DATA

TORPEDO ATTACK NO. 2

Time 0003-0053 Date October 24, 1943 Lat 05°-25'N Long 127°-
                                                      15'E
Attack A (000241) H B (0053) H

Description Small unescorted tanker. Picked up by SJ Radar at a
            range of 9600 yards. Sky was overcast and shifting rain
            squalls made poor visibility. Target was not sighted
            except in flashes of lightning until just prior to firing.
            Too little was seen of target to accurately estimate the
            size.

Ships sunk             0        0
Ships damaged or
probably sunk          0        0
Tonnage                3000     3000
Target draft           15'      15'
Target course          270°     290°
Target speed           8 kts.   8 kts.
Firing range           2500     2900

Own speed              5        5
Own course             035°     270°
Depth                  on surface on surface

Type attack
            Night surface radar attacks except for final bearings
            on TBT. The target was tracked for a period of over
            two hours and it is felt that the course and speed data
            were very accurate.

Attacks A & B were made on the same target.

[HANDWRITTEN: 29]

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U.S.S. CABRILLA (SS288)

TORPEDO ATTACK NO. 2
                  Attack 2-A                                      2-B
                  #1    | #3    | #4    | #2    | #5    | #6
Tubes fired       |     |     |     |     |     |
Track angles      | 65P   | 66P   | 67P   | 68P   | 160S  | 160S
Gyro angles       | 90°L  | 10°L  | 12°L  | 10°L  | 1°R   | 2°R
Depth set         | 10'   | 10'   | 10'   | 10'   | 10'   | 10'
Power             | high  | high  | high  | high  | high  | high
Hit or miss       | miss  | miss  | miss  | miss  | miss  | miss
Erratic           | no    | no    | no    | no    | no    | no
Mark Torpedo      | 14-3A | 14-3A | 14-3A | 14-3A | 14-3A | 14-3A
Serial No.        | 22788 | 23144 | 24470 | 39253 | 25417 | 39166
Mark Exploder     | 6-1   | 6-1A  | 6-1A  | 6-1   | 6-1A  | 6-1
Serial No.        | 10072 | 12072 | 17524 | 11892 | 11138 | 11995
Actuation Set     | contact | contact | contact | contact | contact | contact
Mark Warhead      | 16    | 16    | 16    | 16    | 16    | 16
Serial No.        | 2348  | 10480 | 2432  | 2251  | 5748  | 1127
Explosive         | TPX   | TPX   | TPX   | TPX   | TPX   | TPX
Firing interval   | 8 sec.| 8 sec.| 8 sec.| 8 sec.| 8 sec.| 8 sec.

Type spread       | 1° divergent                          | 1/2° divergent
Sea conditions    | Moderate sea running. Considered too rough for
                  | depth setting less than 10'.
Overhaul activity:| All overhauled at Submarine Base, Pearl Harbor.
Remarks           | The results obtained on the first attack were most
                  | disappointing since the course and speed was ac-
                  | curately determined and two hits should have been
                  | made. One dud hit may have been obtained at
                  | 0004:10 H but it is extremely doubtful. It is be-
                  | lieved that the size of the target was greatly over-
                  | estimated and that the torpedoes probably underran.
                  | Post firing analysis indicated that the last two
                  | torpedoes should not have been fired - the decision
                  | that it was too small to hit was made two torpedoes
                  | later than it should have been.
                  | -25-

[HANDWRITTEN: 30]                                                              [HANDWRITTEN: 26]

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U.S.S. CABRILLA (SS288)

(I) MINES - none encountered.

(J) ANTI-SUBMARINE MEASURES AND EVASION TACTICS

Anti-submarine measures were encountered following the attack
on the ACV and on the following day. The DD in company with the
CVs used echo ranging on two loops and stopped occasionally
to listen. A sharp temperature drop at 160 feet undoubtedly
helped to make the echo ranging ineffective. Evaded at deep sub-
mergence at slow speed, making frequent changes in course but in
general keeping stern to the DD.

On 25 September, when forced down by aircraft, the two
AS vessels which suddenly appeared on the scene apparently had
listening equipment only. Although they came quite close, passing
almost directly overhead on one occasion, it is doubted that we
were ever heard. Depth of 400 feet and silent running was elected
at this time rather than high speed to get clear.

(K) MAJOR DEFECTS, DAMAGE & IMPROVEMENTS

The Bendix Underwater Log continues to be useless since it
is fitted with a surface ship bellows. The original bellows was
found to be badly sprung and was therefore replaced in Pearl Harbor,
but not with a submarine type since none was available. The inability
of the present bellows to withstand pressure makes it impossible to
make an accurate adjustment that will hold both for surface and sub-
merged operations. In addition, the sword arm is bent or the bear-
ings are misaligned, making it very difficult to raise it. It is
recommended that a Pitometer Log be installed during the next re-
fit, unless the promised submarine bellows arrives and the instru-
ment can be proved reliable and accurate.

Both H.P. Air Compressors have frequent valve failures due to
faulty design and material. It is understood that the Bureau has
solved the problem with new type valves and valve cages; and these
should be provided as quickly as possible. During the patrol about
thirty valve ring discs were replaced on the first three stages, and
one 4th stage discharge valve body was replaced.

The Ward Leonard starting panel for the I.C. Motor Generators
is considered to be of improper design for shipboard use. Each
starter consists of a silver plated roller that rides up over four
pairs of silver contacts. Since the eight contacts are separately
mounted, it is practically impossible to keep them in perfect align-
ment, with the result that both contactors and rollers are very
badly pitted. With the original two sets and two spare sets vari-
ously burned, we are now avoiding further use by shifting generators
weekly instead of daily.

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U.S.S. CABRILLA (SS288)

The new Cities Service type NHD Hydrogen Detector is a well-
built accurate and reliable instrument, but it is not so rugged as
to require no other spares than the two extra analyzer blocks
furnished. After six months use it has burned up two analyzer
blocks and two small resistors in the motor circuit, the latter re-
quiring a home-made replacement. Adequate spares for every non-
standard item in the instrument should be furnished.

Numerous hydraulic leaks were experienced due to faulty
brazing.

Bridge gyro repeater flooded out on a dive to 400 feet.

The Gould 6-stage Centrifugal Trim Pump installed on this
vessel appears to be the answer to many submariners' prayers. De-
clared inaudible by New London and Pearl Harbor, it was used while
evading a depth charge destroyer after the first attack, and
again the following day upon getting very heavy 400 feet almost
directly under two listening anti-submarine vessels. Pumping did
not appear to attract notice from the listening vessels. In addition
to this tremendous advantage, its capacity runs from 350 to 130
gallons per minute down to 400 feet.

(L) RADIO

I. Communications:

Reception was normal throughout the patrol. JAP inter-
ference was especially noticeable after messages had been
sent, during the period while waiting for "ROGER", presum-
ably in the hope of causing us to retransmit our message.

Last serial received from CTF 17 - 93L
Last serial sent to CTF 17 - 2
First serial from CTF 71 - 9
Last serial from CTF 71 - 74
Last serial to CTF 71 - 3

II. Materiel.

The standard pressure-proof speaker on the bridge was
knocked out on the depth charging of Sept. 24th.

[HANDWRITTEN: 32]
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(M) RADAR.

I. SJ Radar.

The keyer tube, V1 (813), developed an open filament on
Sept. 20 and was replaced by the remaining spare. On Oct.
5, after 125 hours operation, this tube also failed. No
more spares were carried so as an outside chance tried an
803(TBL-7 power amplifier tube) in the SJ 813 socket, after
rigging the prongs to fit the proper terminals in the old
813 base. As was expected, the substitution failed.

By a method suggested by F.J. Fowler, R1c, U.S.N.R.,
decided to try reactivating the thoriated filament of the
813. This was accomplished as follows:

The tubes in the TBL-7 transmitter were removed and two
leads were run from one of the tube sockets to the filament
prongs of the 813. The TBL-7 filament rheostat was adjusted
to give 12 volts on the 813 filament (20% overload) for 20
seconds, and then lowered to 11.5 volts (15% overload) for
3 hours. No grid, screen, or plate voltages were applied
during this time. The tube was then replaced in the radar
and operation was restored to normal.

On Oct. 27, after 250 hours continuous operation, the 813
again failed. The same procedure was tried again but
operation was restored for only 11 hours.

It was then decided that a higher voltage in the re-
activating process may again restore the weak filament.
Since the TBL-7 would not provide the necessary voltage, the
SD Radar transmitter was used to provide 17.5 volts (75%
overload). This voltage was held for 40 seconds and then re-
duced to 12 volts for 4 hours. Operation of the radar was
again restored to normal, this time for a period of 12 hours
before failure.

No other major difficulties were experienced. Replacement
of one defective 616 tube (V10) in the knocker circuit, and
routine repairs and maintenance comprised the remainder of
the work performed.

No interference was encountered.

II. SD Radar.

The only operational difficulty encountered was on Sept.
25 when the 8014 oscillator tubes in the transmitter failed
after 246 hours operation.

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[HANDWRITTEN: 33]
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U.S.S. CABRILLA (SS288)

(N) SOUND GEAR AND SOUND CONDITIONS

I. Sound conditions were normal; no unusual phenom na were
observed.
From the limited experience with the JP sound equipment
to date, it is believed that screws will invariably be picked
up by this equipment sooner than by supersonic equipment.

II. Materiel.

A. NM Fathometer:
Early in the patrol the NM head developed a zero ground
reading due either to flooding or burned out insulation.
As a consequence this equipment was inoperative during
patrol inasmuch as repairs could not be made at sea.

B. JK-QC Echo Ranging - Listening Equipment:
A hydraulic oil leak developed inside the JK-QC head
hydraulic shaft, caused oil to enter and fill the void
space in the shaft holding the cables which lead to the
heads. Oil under pressure was forced into these cables
causing the outside rubber coating to rupture. It is be-
lieved that oil has entered the heads. Although resist-
ance readings were normal on the QC side, erratic readings
were found on the JK. A megger reading showed the resist-
ance of the hydraulic oil to be infinity.
The training mechanism drive pinion slipped axially
on its shaft causing poor contact to be made with the
electrical limit switch pinion, resulting in loud knocking
when the tops of the two gears were made contact.
A taper pin was installed and the trouble was remedied.

C. JP - Sonic Listening Equipment.
Some difficulty was experienced with the training
equipment. A more rigid bearing arrangement for the
shafting outside the hull is desirable. A supporting
structure built up from the hull and complete detachment
of the upper bearing from the superstructure should be an
improvement.

[HANDWRITTEN: 34]
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U.S.S. CABRILLA (SS288)

(O) DENSITY LAYERS

It was determined that our nearly incompressible hull ac-
quires 900 pounds of buoyancy per degree temperature drop right on
down to 400 feet. However, about 200 pounds per degree of this
acquired buoyancy is gradually lost as the main ballast cools over
a period of hours (especially noticeable if the vents are left open).
No marked exceptions to the above rule were observed.

The following density layers are listed:

| Area        | Lat.    | Long.   | Date  | Local time | Depths    | Temperatures | Slope |
||||-------||||-------|
| Hawaii      | 21-08N  | 158-13W | 9/4   | 0800       | 000-360'  | 30-75°       | 8.3   |
| Midway      | 26-25N  | 172-52E | 9/18  | 0600       | 170-220'  | 81-74°       | 14.0  |
| Bonin Is.   | 28-00N  | 145-36E | 9/24  | 0800       | 120-440'  | 83-70°       | 4.0   |
| do          | 25-10N  | 144-00E | 9/25  | 0600       | 130-260'  | 83-68°       | 11.5  |
| do          | do      | do      | do    | 1630       | 180-380'  | 83-68°       | 7.5   |
| do          | 22-00N  | 142-40E | 9/26  | 0600       | 160-200'  | 85-82°       | 7.5   |
| Molukka Sea | 01-43S  | 126-35E | 10/27 | 0500       | 170-240'  | 83-75°       | 11.4  |

[HANDWRITTEN: 35]

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U.S.S. CABRILLA (SS288)

(D) Health, Food Habitability.

The health of the crew remained excellent throughout
the patrol. After our first all day dive about 20 men
developed colds, but the epidemic was of short duration.

The food was very good. Some shortages developed
towards the end of the patrol but these can be prevented
in the future. The fresh meat stowage is excellent.
While building, particular attention was given to pro-
viding adequate air circulation. Also, it is believed
that the ozone machine installed in the cold room has
minimized the formation of harmful bacteria.

Habitability was not good. Every conceivable method
of ventilation was tried but no satisfactory solution
was found. The ventilation was particularly inadequate
when patrolling at slow speeds on the surface. The
exhaust system is believed to be the cause of the
trouble.

[HANDWRITTEN: 36]
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[HANDWRITTEN: 1 012]
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U.S.S. CABRILLA (SS288)

(Q) PERSONNEL

The performance of duty under combat conditions of all
officers and men was in keeping with the highest traditions of the
Naval Service.
At the beginning of the patrol a large percentage of the
crew was new to submarines as well as going to sea under any con-
ditions.
The efficiency of the crew began to improve noticeably
shortly after the attack and depth charging while enroute to the
area and continued to improve throughout the patrol. The state of
training at the end of the patrol is considered to be very good.

(R) MILES STEAMED--FUEL USED

Pearl to Midway             1280 miles (RPM)     14,721 gals.
Midway to area              3340 miles (RPM)     32,145 gals.
In the area                 2840 miles (RPM)     18,270 gals.
Area to Fremantle           3021 miles (RPM)     29,782 gals.
TOTAL                      10,481 miles (RPM)    94,918 gals.

(S) DURATION
Days enroute to area - 16
Days in area         - 24
Days enroute to base - 14
Days submerged       - 34

(T) FACTORS OF ENDURANCE REMAINING
Torpedoes      FUEL         PROVISIONS   PERSONNEL FACTOR
12             12,900 gals. 15 days      ?

Limiting factor this patrol - Operation Order.

[HANDWRITTEN: 37]
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CONFIDENTIAL
FC5-10/A16-3
SERIAL 058

From:
To :
Via :

Subject:

1. The first patrol of CABRILLA, conducted in the
Western Pacific, the SIBUYAN and VISAYAN SEAS, covered a
period of fifty-six days, from 12 September to 6 November
inclusive. CABRILLA spent more than the average time submerged.
This was necessary because of the nature of the patrol area.
Good submarine targets were scarce throughout the whole of this
area.

2. Three attacks were made and a total of twelve
torpedoes were expended. Damage only was inflicted in the
attack of 24 September and two valuable targets escaped. Enemy
aircraft and escort vessels were undoubtedly a great handicap
to the CABRILLA but the value of the damaged target was so
great it is considered that circumstances indicated the
acceptance of a greater calculated risk in pushing in for the
kill. No damage was inflicted on the enemy in the second and
third attacks on the tanker on 24 October.

3. The material condition of CABRILLA on completion
of the patrol is in general excellent.

4. The CABRILLA successfully accomplished a special
mission.

SUBMARINE SQUADRON SIXTEEN
U.S.S. RASHER, Flagship

7 November 1943.

The Commander Submarine Squadron SIXTEEN.
The Commander in Chief, UNITED STATES FLEET.
The Commander Task Force SEVENTY ONE.
The Commander SEVENTH FLEET.

U.S.S. CABRILLA (SS283) - Report of 1st
War Patrol - comment on.

[SIGNATURE: J. M. HAINES]
J. M. HAINES.

1 012
[HANDWRITTEN: 34]

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[STAMP: Ser. No. 1047-1]
[STAMP: R.S. No. 1 012]

FE24-71/A16-3 UNITED STATES NAVY 12-lcs
Serial 0930
25 November, 1943.

C O N F I D E N T I A L

SECOND ENDORSEMENT to
CABRILLA SS288/A12-1 serial
015 of 6 Nov. 1943.

From: Commander Task Force SEVENTY-ONE.
To : Commander in Chief, UNITED STATES FLEET.
Via : Commander SEVENTH FLEET.

Subject: U.S.S. CABRILLA (SS288) First War Patrol -
Comment on.

1. Forwarded, concurring in general with the remarks of
Commander Submarine Squadron 16. It is felt that the scarcity of
contacts in the PHILIPPINES may also be partially attributed to
the commanding officer's unfamiliarity with the area on this, his
first war patrol in the Pacific theater.

2. Twelve Mark 14-3A torpedoes were fired during attacks
on two targets. Two hits were obtained; six torpedoes missed be-
cause of control errors or torpedoes under-running the target; and
four spread misses resulted. Exploders were Mark 6 Mod 1, magnet-
ically inactivated.

3. This patrol is considered "successful" for purposes
of awarding the Submarine Combat Insignia.

4. In addition to successfully completing a special
mission, the CABRILLA is congratulated on inflicting the following
damage upon the enemy:

Damaged

1 Aux. carrier (CHUYU class) 17,200 tons

5. The above listed damage was inflicted in areas under
the operational control of the Commander Submarines, Pacific Fleet,
who is requested to credit same on his records.

[SIGNATURE: R. V. CHRISTIE]

[Circle symbol] (Distribution &
Authentication
on following page.)
[HANDWRITTEN: 35]

— page 39 —
F224-71/A16-3 UNITED STATES NAVY 12-lcs
Serial 0930
C O N F I D E N T I A L
Subject: U.S.S. CABRILLA (SS288) First War Patrol -
Comment on.

— page 40 —
[STAMP: Rec'd. No. 144.R.]
[STAMP: L.G. No. 1.012.]
UNITED STATES FLEET
COMMANDER SEVENTH FLEET

A16-3
Serial: [HANDWRITTEN: 02510]
11/ag

[STAMP: 19 DEC 1943]

C O N F I D E N T I A L

THIRD ENDORSEMENT to
CABRILLA SS288/A12-1
ser. 015 of 6 Nov. 1943.

From: The Commander Seventh Fleet.
To : The Commander in Chief, United States Fleet.

Subject: U.S.S. CABRILLA (SS289) First War Patrol -
Comment on.

1. Forwarded.

[SIGNATURE: C. E. Van Hook]
C. E. VAN HOOK,
Deputy.

Copy to:
OpNav

[STAMP: FILMED]
[HANDWRITTEN: 37]

— page 41 —
U.S.S. CABRILLA (SS288)
c/o Fleet Post Office
San Francisco, Calif.

23 January 1944

SS288/A12-1
Ser 02
DECLASSIFIED T-I-A-L

To: The Commanding Officer,
Via: Commander in Chief, U.S. Fleet.
(Official)

Subject: U.S.S. CABRILLA (SS288), Report of War Patrol
Number Two.

Enclosure: (A) Subject Report.

1. Enclosure (A), covering the Second War Patrol of
this vessel conducted in the South China Sea during the period
1 December 1943 to 23 January 1944, is forwarded herewith.

[SIGNATURE: D.T. Hammond]
D.T. HAMMOND.

[STAMP: DECLASSIFIED]

[STAMP: DECLASSIFIED ART. 0445, OPNAVINST 5510.10
BY [HANDWRITTEN: OP-09B9C] DATE [HANDWRITTEN: 5/29/72]]

— page 42 —
SS238/A12-1
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288)

(A) PROLOGUE

     Completed First War Patrol and arrived in FREMANTLE, WEST
AUSTRALIA, on 6 November 1943. Refit, which included dock-
ing, completed by Submarine Repair Unit on 21 November
1943.

     Conducted training exercises, deep dive, sound tests,
and effected minor post refit repairs during the period
22 November to 27 November 1943. Did not fire torpedoes
or guns due to rough seas and lack of target for gun
practice.

     During the training period five torpedo tube outer doors
developed leaks. Upon docking on 28 November it was found
that five gaskets had been blown out and that the remaining
gaskets had been installed edgewise. Installed new gaskets
properly and undocked on 28 November 1943.

     Completed final loading and ready for sea on 30 November
1943.

- 1 -

— page 43 —
SS288/A12-1
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L
(B) NARRATIVE

                                                                U.S.S. CABRILLA (SS288)

                                                                1 December 1943

1500 H Departed FREMANTLE, W.A., for submarine exercise area in
        company with U.S.S. ISABEL for day and night training
        exercises.

1730 H Cancelled day exercises to correct leaky loading hatch and
        make electrical repairs to bow plane rigging and tilting
        gear.

2240 H Completed night exercises, released ISABEL, and set course
        for EXMOUTH GULF via bombing restriction area in accordance
        with Commander Task Force 71.1 operation order No. 45-43
        of 29 November 1943.

                                                                2 December 1943

        Enroute patrol area via EXMOUTH GULF on surface. Conducted
        training dives and drills.

1200 H Lat 29-35 S Long 113-19 E.

                                                                3 December 1943

        Enroute patrol area via EXMOUTH GULF on surface. Conducted
        training dives, fire control drills, and surface tracking
        problem. Made battle surface and fired all guns for
        training.

1200 H Lat 24-48 S Long 112-27 E.

                                                                4 December 1943

        Enroute patrol area via EXMOUTH GULF on surface.

0600 H Sighted VLAMING HEAD LT. and set course to enter EXMOUTH
        GULF.

0700 H Exchanged calls with outbound U.S.S. LARK.

0914 H Moored alongside Netherlands tanker ONDINA and commenced
        fueling.

1145 H Completed fueling, having received 9,760 gallons of fuel.
        Underway clearing EXMOUTH GULF.

                                                                - 2 -

— page 44 —
U.S.S. GABRILLA (SS288)
SS288/A12-1
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C-O-N-F-I-D-E-N-T-I-A-L

1518 H Made trim dive.
1538 H Surfaced. With VLANGHEAD LT. bearing 180°(T), distance
          10 miles, set course for LOMBOK STRAIT.
          5 December 1943
          Enroute patrol area on surface. Made training dives,
          held drills, and tracking problems.
1200 H Lat 17-33 S Long 114-31 E.

          6 December 1943
          Enroute patrol area on surface. Conducted training dives
          and swung ship.
1200 H Lat 13-28 S Long 115-04 E.

          7 December 1943
          Enroute patrol area on surface.
1146 H Sighted LOMBOK ISLAND bearing 017°(T) distance about 40
          miles.
1200 H Lat 9-27 S Long 115-47 E.
1225 H Submerged for rest of day to transit LOMBOK STRAIT during
          darkness.
1845 H Surfaced in rain squall. Sky completely overcast.
1920 H Located entrance to LOMBOK STRAIT by radar and set course
          to enter.
2030 H Entered LOMBOK STRAIT, navigating by radar.
2230 H Cleared LOMBOK STRAIT, navigated by radar throughout and
          saw hazy outline of land only when rain slackened. Set
          course for MAKASSAR STRAIT.

          8 December 1943
          Enroute patrol area on surface. Complete overcast, seas
          making up and wind increasing from the west. Poor visibility
          and rain squalls throughout the night.

          - 3 -

— page 45 —
SS288/A12-1
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C-O-N-F-I-D-E-N-T-I-A-L
U.S.S. CABRILLA (SS288)

0544 H Sighted patrol bomber (MAVIS) bearing 240°(T), distance
       about three miles, on parallel course and flying very low.
       A plane had no business here at this early hour unless
       looking for something in particular. It is believed that
       because through LOMBOK Strait last night might have been detected
       by sound or radar. Due to visibility conditions it is im-
       probable that we were sighted.
       Lat 6-52 S Long 116-30 E.

0544 H Submerged - apparently not sighted by plane. Decided to
       stay submerged until visibility improves.

1122 H Surfaced. Visibility better but still overcast with
       threat of more rain.

1200 H Lat 06-00 S Long 116-50 E.

1204 H Sighted sailboat and avoided on surface.

1507 H Upon clearing rain squall sighted sailboat with sails
       down bearing 345°(T) distance about three miles. Submerged
       to avoid detection.

1823 H Surfaced - sailboat still in sight. This boat could have
       been a watcher or could have been merely lying to with sails
       down due to strong winds and extremely rough sea. Unable
       to obtain fix.

2219 H Picked up LELA ISLANDS by radar, closed to identify and fix
       position. Set course for CAPE WILLIAM.

                               9 December 1943

       Enroute patrol area on surface in MAKASSAR STRAIT. Sky
       overcast, visibility poor, wind and sea calming down.

0529 H Submerged off CAPE MANDAR. Bridge hatch has developed a
       bad leak which stops at 60 feet. Several attempts were
       made to correct this condition during the refit period and
       attempts to make adjustment while enroute have been un-
       successful.

1200 H Lat 3-22 S Long 118-39 E.

1823 H Surfaced.

2120 H Sighted sailboat and avoided.

                               - 4 -

— page 46 —
SS288/A12-1 U.S.S. CABRILLA (SS288)
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L

10 December 1943

Enroute patrol area on surface in MAKASSAR STRAIT. Clear
and calm - brilliant moonlight.

0601 H Submerged.

1200 H Lat 00-07 S Long 118-56 E.

1619 H Sighted float-type plane (DAV?) bearing 206°(T) distance
6 miles on easterly course.
Lat 00-27 N Long 118-59 E.

1828 H Surfaced.

1930 H Sighted sailboat and avoided.

2131 H Sighted SC type patrol boat bearing 318°(T) distance 600
yards and avoided.
Lat 1-08 N Long 119-25E.

2200 H Departed MAKASSAR STRAIT and set course for SIBUTU PASSAGE.

11 December 1943

Enroute patrol area on surface. Made training dives.

1200 H Lat 04-03 N Long 119-47 E.

2050 H Entered SIBUTU PASSAGE.

2200 H Sighted sailboat and avoided.

2217 H Sighted sailboat and avoided.

2226 H Departed SIBUTU PASSAGE and set course for BALABAC STRAIT,
passing to eastward of CAGAYAN SULU.

- 5 -

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SS288/A12-1
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C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288)

12 December 1943

Enroute patrol area on surface. Made trim dive.

0529 H Sighted sailboat and avoided.

1200 H Lat 6-56 N Long 119-00 E.

1753 H Sighted BALABAC ISLAND bearing 280°(T), distance about
40 miles.

2110 H Commenced transit of LUMBUCAN CHANNEL, BALABAC STRAIT.

2300 H Cleared BALABAC STRAIT and set course to gain daylight
position off ROYAL CAPTAIN SHOAL to intercept probable
enemy traffic through PALAWAN PASSAGE.

13 December 1943

Enroute to patrol area, searching for traffic in PALAWAN
PASSAGE, brilliant moonlit night.

0136 H Sighted submarine bearing 280°(T) distance about 3 miles.
Turned toward to identify and reduce own silhouette.
Lat 8-15 N Long 116-42 E.

0142 H Did not appear to be U.S. submarine. Commenced end around
to gain position ahead for daylight attack if definitely
identified as enemy. Considered possibility of PORYO
and BILLFISH being in the vicinity. Estimated course
035, estimated speed 14 knots.

0203 H Submarine turned toward us and disappeared. Submerged
immediately. Since we had a larger silhouette, it is
possible that we were sighted first and that he was also
trying to gain position ahead when we first made contact.
Could hear nothing on sound for one hour and at

0306 H Surfaced and set course to gain daylight position ahead on
estimated track of submarine through PALAWAN PASSAGE.

0338 H Sighted smoke bearing 310°(T) distance about 24,000 yards.
Decided this offered a much better chance of inflicting
damage than trying to regain contact with the submarine
not yet positively identified as enemy. Commenced closing
smoke and tracking.
Lat. 8-26 N Long 116-37 E.

- 6 -

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SS288/A12-1
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C-O-N-F-I-D-E-N-T-I-A-L
                                                              U.S.S. CABRILLA (SS288)

0400 H Estimated course 215°, estimated speed 15 knots. Commenced
         and around run at full speed for daylight attack; angle
         on bow about 120° port.

0500 H Made out occasional glow of light on target - at first
         thought this to be signalling.

0530 H Made out huge electrically lighted red cross on funnel and
         white flood lights forward and aft of funnel. Continued
         closing for a better look in daylight.

0555 H Made out white hull and definitely identified ship as
         having proper markings of hospital ship. Decided not to
         expend fuel to get ahead to take pictures and gave up
         chase. This ship did not smoke continuously but would
         periodically lay down a huge cloud of it. It is believed
         that this might have been done purposely to draw possible
         submarines away from other traffic.

0606 H Submerged for the day. This seems to be a good spot for
         traffic approaching PALAWAN PASSAGE and BALABAC STRAIT.

1200 H Lat 08-00 N Long 116-07 E.

1805 H Surfaced. Set course for vicinity of CAPE KAMAO.

                                                              14 December 1943

Enroute vicinity of CAPE KAMAO on surface.

0603 H Sighted SULLOW REEF bearing 298°(T) distance about 3
         miles. Had been set at a rate of about 1 knot in the
         opposite direction to that expected.

1200 H Lat 7-04 N Long 112-56 E.

         Passed within approximately 100 miles of assigned area.
         Proceeding with plan to complete special mission prior to
         moonrise on 18 December 1943.

                                                              15 December 1943

Enroute vicinity of CAPE KAMAO on surface. Made trim dive.
Crossed most probable Singapore - Empire traffic route
during the day.

1200 H Lat 6-28 N Long 108-23 E.

                                                              - 7 -

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SS288/A12-1
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C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288)

16 December 1943

     Enroute vicinity CAPE KAMAO on surface. Crossed most
     probable Singapore - Saigon route during the day. Held
     drills and conducted battle problem.

0635 H Submerged.

1200 H Lat 6-35 N Long 105-34 E.

1700 H Set clocks back one hour to zone (-) 7 time.

1801 G Surfaced.

17 December 1943

     On special mission in GULF OF SIAM.

0539 G Submerged.

1200 G Lat 8-05 N Long 102-55 E.

1805 G Surfaced.

18 December 1943

     On special mission in GULF OF SIAM.

0452 G Submerged.

1200 G Lat 10-07 N Long 102-43 E.

1824 G Surfaced.

2207 G Completed special mission. Separate report including track
     chart submitted.
     Set course for return to assigned area.

19 December 1943

     Enroute GULF OF SIAM to assigned area.

0558 G Submerged.

1200 G Lat 08-59.5 N Long 102-50 E.

1750 G Surfaced.

                                   - 8 -

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SS288/A12-1
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C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288)

20 December 1943

Enroute GULF OF SIAM to assigned area. Crossed Singapore -
Siagon traffic route during the day.

0605 G Submerged.

1200 G Lat 07-07 N Long 104-49 E.

1306 G Surfaced.

21 December 1943

Enroute GULF OF SIAM to assigned area.

1200 G Lat 06-54 N Long 107-52 E.

1330 G On most probable traffic route from Empire to Singapore.
Patrolling along this route on course 035°(T) enroute as-
signed area.

22 December 1943

Enroute GULF OF SIAM to assigned area on probable
Singapore - Empire traffic route. Made trim dive and
conducted drills.

1200 G Lat 08-50 N Long 109-42 E.

1800 G Entered assigned patrol area. Twenty-one days were re-
quired to reach the assigned area. The special mission
consumed seven of these days and required running approxi-
mately 1200 miles (900 miles surface and submerged in
shallow water) farther than the direct route to the assigned
area. A considerable portion of this time was spent in
likely contact areas.

23 December 1943

Patrolling on surface across probable Empire - Siagon -
Singapore traffic routes. Made trim dive.

1200 G Lat 10-14.5 N Long 110-54 E.

1500 G Set clocks ahead to zone (-) 8 time.

- 9 -

— page 51 —
SS288/A12-1
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288)

1620 H Sighted oil drum - no evidence of wreckage or water dis-
coloration.

24 December 1943

Patrolling on surface across possible Empire - Saigon -
Singapore routes in eastern part of area. Made trim dive.
Discovered crack in forward group 600 pound blow manifold;
probably cracked upon surfacing on 23 December. Rigged
clamps to prevent increase in crack and to reduce leakage
when manifold is used for surfacing. This manifold will be
isolated while submerged except when preparing to surface.

1200 H Lat 10-35 N Long 110-41.5 E.

2103 H Heard following unintelligible voice transmission on 2880
Kcs - "ABLE VICTOR FOX".

25 December 1943

Patrolling on surface across possible Singapore - Saigon -
Empire routes. Made trim dive. Bridge hatch leak has gradu-
ally become worse and new leaks so badly at 40 to 45 feet
that use of radar for submerged radar approach would be im-
possible. Efforts to adjust have failed and the difficulty
is attributed to a dead rubber gasket. The spare gasket
normally carried on board disappeared during the last refit,
unknown to the ship's force.

1200 H Lat 10-34.5 N Long 110-46.5 E.

26 December 1943

Patrolling on surface across most probable Empire -
Singapore route. Heavy swells, occasional squalls, and
generally poor visibility. Made trim dive.

1200 H Lat 09-38 N Long 110-12 E.

27 December 1943

Patrolling on surface across most probable Singapore -
Empire route. Squally and overcast with heavy swells.

1200 H Lat 10-36 N Long 110-38.5 E.

- 10 -

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SS288/A12-1
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C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288)

28 December 1943

Patrolling on surface across most probable Singapore -
Empire route. Squalls and heavy swells continue with
poor visibility night and day. Made trim dive.

1200 H Lat 10-29 N Long 110-43 E.

29 December 1943

Patrolling on surface in assigned area closing coast to
patrol inshore traffic routes. Poor visibility and heavy
swells continue.

0657 H Submerged for the day. Patrolling five to ten miles east
of PULO CECIR DE MER ISLAND. This is believed to be a focal
point for Singapore - Saigon - Empire traffic using inshore
routes.

1200 H Lat 10-35.5 N Lat 109-05 E.

1840 H Surfaced. A strong southwesterly current of about three
knots was experienced throughout the day and we remained
in approximately the same spot while running at three knots.
Broached twice during the day while making four knots.

30 December 1943

Patrolling inshore routes on surface proceeding to CAPE
PADARAN for daylight patrol. Rain squalls, heavy swells,
and poor visibility continue. Due to heavy swells decided
to attempt surface patrol during daylight.

0800 H SD radar contact at 11 miles. Submerged to avoid detection
and decided to remain submerged for the day since visi-
bility conditions were not suitable for surface patrol
this near KAMRANH BAY sea plane base. Closing CAPE PADARAN
submerged.

1200 H Lat 11-20 N Long 109-23 E.

1841 H Surfaced in very rough sea and took water down conning
tower hatch.

1900 H Commenced raining with increasing winds. Inshore patrol
impractical due to visibility conditions and strong un-
predictable currents; standing away from coast until
weather improves.

- 11 -

— page 53 —
0

SS288/A12-1
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C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288).

1905 H Heard the following unintelligible voice transmission on
          2880 Kcs - "ABLE VICTOR GEORGE". There was apparently
          more to this transmission that was not readable. POMPON
          in adjacent area, is on this frequency but the two trans-
          missions, or parts of transmissions, heard to date do not
          fit the pre-arranged code.

          31 December 1943

          Patrolling to eastward from CAPE PADARAN towards off-shore
          traffic routes. Heavy swells, continuous rain, and in-
          creasing winds from the Northeast.

0200 H Barometer began falling slowly.

1100 H Barometer began falling rapidly, about .07" in fifteen
          minutes. The wind increased to gale force and began shift-
          ing to the east; heavy rain and very rough sea.

1200 H Lat 09-18 N Long 110-02 E.

1400 H Storm center passed to southward and barometer began to
          rise slowly. Wind, sea, and rain moderating.

1500 H Fathometer out of commission for rest of patrol due to
          flooding.

1600 H Visibility improving with general clearing of weather.
          Heading toward coast to patrol inshore traffic routes.

          1 January 1944

          Patrolling on surface enroute PULO CECIR DE MER for day-
          light submerged patrol.

0720 H Submerged. Patrolling five to ten miles east of PULO
          CECIR DE MER ISLAND.

1200 H Lat 10-27.5 N Long 109-04.5 E.

1858 H Surfaced. Poor visibility throughout the day. CECIR
          DE MER not visible at times at eight miles.

          2 January 1944

          Patrolling inshore traffic routes on surface, enroute CAPE
          PADARAN for daylight submerged patrol. Light winds and
          calm sea for first time since entering area. Low lying
          clouds and surface haze still makes poor visibility toward
          coast.

- 12 -

— page 54 —
* SS288/A12-1
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U.S.S. CABRILLA (SS288)

0645 H Doubtful SD radar contact at 24 miles.
0649 H SD radar pip at 20 miles.
0649 H Submerged.
1200 H Lat 11-07 N Long 109-10 E.
1848 H Surfaced.

3 January 1944

Patrolling on surface off CAPE PADARAN.

0315 H SJ radar contact at 2700 yards bearing 005 relative. Dark
but clear night and could not see anything. Turned away
and commenced tracking.

0328 H Lost contact at 4300 yards. The pip was weak and began
to fade at 3000 yards.

0332 H Reversed course and regained contact at 4000 yards and
resumed tracking. Determined object to be dead in the
water. Closed range to 2100 yards and still could not see
anything.

0400 H Contact still dead in water. Decided it must be a sail
boat with sails down or other small boat. Opened range
and returned to vicinity for further investigation at day-
light and failed to sight anything. Under visibility con-
ditions existing at the time, the smallest of patrol boats
or submarines could have been seen at 2100 yards.

0617 H Submerged.
0958 H Surfaced.
1200 H Lat 10-51 N Long 109-58.5 E.

4 January 1944

Patrolling on surface off CAPE PADARAN. Moderate sea and
poor visibility.

0638 H Submerged to patrol 5 - 10 miles off CAPE PADARAN.

0800 H Found current to be running 215(T) at approximately 3.5
knots setting us toward mine field south of CAPE PADARAN.
Visibility very poor inshore - CAPE PADARAN light and shore
line not visible at times at eight miles.
- 13 -

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SS288/A12-1 U.S.S. CABRILLA (SS288)
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L

0900 H By steering 070(T) at four knots making good course 135(T).
1200 H Lat 11-11 N Long 109-06 E.
1530 H Sighted masts and bridge structure bearing 225°(T) with
         large port angle on bow, estimated range 16000 yards.
         Commenced approach.
         Lat 11-07 N Long 109-07 E.
1535 H Sighted second ship astern and to port of the first one
         sighted. Both ships were smoking and would have been
         picked up at a much greater range with good visibility.
         Identified both ships as heavily loaded AKs, estimated
         tonnage 4000 - 6000 tons each. They were similarly con-
         structed: composite well decks and counter sterns with
         single stick mast, single funnel, single stick mast.
1610 H Course of AKs 075(T), not zig zagging, speed 6 knots.
         They were heading into a fairly heavy sea and is estimated
         that they were making turns for at least nine knots.
         Planned to fire three torpedoes at each on 110 port track.
1624 H. Second AK in column changed course to the right, passed
         astern of the leading one, and then changed back to the
         left and drew ahead to form a line of bearing 160(T).
         This maneuver increased the mean range by about 1000
         yards, but the plan to fire three at each still looked
         good, but at a greater range.
1646 H Farther AK now overlapping the near one by a half ship's
         length. Changed firing plan and decided to fire four
         torpedoes using the stack of the near one as a point of
         aim, expecting the spread to take care of the second
         target if the data was correct.
         Range 2200 yards; track angle 105 port.

1646-39H Fired #1
1646-47H Fired #2
1646-55H Fired #3
1647-02H Fired #4

         First torpedo passed ahead.
1648-24H Heard and observed second torpedo hit forward of stack
         of near AK.
1648-33H Heard and observed third torpedo hit aft of stack of
         near AK.

         Upon attempting to close #4 tube door it was discovered
         that the torpedo was still in the tube - part way out
         apparently, as door could not be closed.

- 14 -

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1648-46H With farther AK overlapping the one already hit by a
        half ship's length, fired #5 to hit using stack of
        second AK as point of aim.

1648-58H Fired #6 at second target, designed to go astern.

1650-16H Heard and observed #5 hit the first AK directly under
        stack. The first two hits had stopped him on the track
        of the torpedo labeled for the second target.
        After firing #5 and #6 the second AK turned away and
        dropped two depth charges. The second torpedo fired at
        this ship (number six) passed astern of the first ship and
        along port side of the second one.

1651 H  Fired #4 tube again and torpedo cleared but was not heard
        running.

1652-33H Observed AK hit by three torpedoes sink - 5 min. and 46
        sec. after first hit.

1653 H  Second AK commenced firing after deck gun at periscope
        while heading away. (Gun firing continued for about
        30 minutes.) Commenced trailing and tracking submerged
        and determined course to be 130(T), speed 9 knots.

1800 H  Target commenced changing course in small steps toward
        original base course (075(T)).

1830 H  Lost contact.

1858 H  Surfaced and commenced search. Assumed that he would come
        back to the general direction of the afternoon base course
        at dark.

1930 H  Sent serial one to Commander Task Force Seventy-one for
        information since AK when last seen was headed for PONPON
        area.

2006 H  SJ radar and sight contact bearing 070(T), range 9250
        yards. Commenced tracking and end around run. Target was
        undoubtedly the same as the afternoon contact.

2230 H  AK course 075(T), speed 6 knots, for about two hours.
        Having gained station 10,500 yards ahead and 3000 yards
        from track, submerged with AK in sight from bridge.

2301 H  Sighted AK in periscope on approximate bearing generated
        by TDC. Had been unable to use radar to continue tracking
        after submerging due to excessive water being taken in
        bridge hatch at radar depth.

                                - 15 -
U.S.S. CABRILLA (SS288)

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U.S.S. CABRILLA (SS288)

2314-30H Track angle 87 starboard, range 1050 yards - periscope
          estimate just prior to firing. Bearings indicated less
          speed or greater range and reluctantly reduced speed one
          knot since speed of 6 knots had checked for over two
          hours while on surface.

2314-30H Fired #1
2314-38H Fired #2
2314-46H Fired #3

2315-13H Heard and felt one hit. Although the time of this hit
          checks closely with the estimated torpedo run for number
          two, it is believed that the range was less than estimated
          and that the first two torpedoes passed ahead and the third
          one hit. Bearing of target after firing indicated that he
          was dropping back on bearing.

2319-50H Heard torpedo explode at end of run.
2320-10H Heard torpedo explode at end of run.

2324 H AK commenced firing forward deck gun down torpedo tracks
          in our direction. Could not hear screws.

2328 H Heard screws start up and observed AK changing course
          toward us, still firing deck gun in our direction.
          seemed that he might have listening gear.

2331 H AK heading directly for us at a range of about 1000 yards.
          Went deep.

2333 H Screws stopped.
2335 H Screws for about one minute.
2337 H Screws for about one minute.
2340 H Screws for about two minutes.
2344 H Steady, slow screws, on constant bearing.

2348 H AK heard to pass directly overhead but the expected depth
          charges were not received.

2352 H Screws stopped and were not heard again.

                                        5 January 1944

0025 H Started back to periscope depth.

0035 H Nothing in sight at periscope depth.

0045 H No radar or sound contacts.

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0050 H Surfaced. No sight or radar contacts. Commenced searching
          in the immediate vicinity. Since screws were heard to
          stop four minutes after passing directly overhead and were
          not heard to start again, it was believed that he must
          still be in the immediate vicinity if still afloat.
0200 H No contacts. Effective visible range on this target before
          the attack was 10,000 yards, and radar range about 12,000
          yards. Continued search toward the northeast without
          further contact.
0644 H Submerged.
1200 H Lat 10-29 N Long 110-36.5 E.
1839 H Surfaced.

          6 January 1944
          Patrolling on surface across possible traffic routes in
          eastern part of area. Moderate seas, fair visibility.
1200 H Lat 10-43 N Long 111-46.5 E.

          7 January 1944
          Patrolling on surface across possible traffic routes in
          eastern part of area. Moderate seas, fair visibility.
          Made trim dive.
0800 H Set course to return to vicinity of CAPE PADARAN - CECIR
          DE MER.
1200 H Lat 09-58 N Long 111-17 E.
1400 H Wind and sea making up from north-northeast. Commenced
          raining.
2130 H Rain, strong wind and heavy swells continue; swells are
          now about twenty feet high. Since inshore patrol submerged
          would be impracticable and ineffective decided to reverse
          course and continue patrol of off-shore routes to the
          eastward.

          8 January 1944
          Patrolling across probable traffic routes on surface in
          central part of area. Rain and heavy swells continue
          from the northeast. Made trim dive.
0700 H Obtained fix and set course for FIERY CROSS REEF to patrol
          west of DANGEROUS GROUND for remaining time in area.
1200 H Lat 9-58.5 N Long 111-33 E.

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9 January 1944

Patrolling on surface west of FIERY CROSS REEF. Made
trim dive.
1200 H Lat 09-29 N Long 111-30.5 E.
1815 H Submerged for plane reported by lookout. Later decided
it was probably a bird since a plane, unless carrier
based, is not likely to be in this locality so late in
the day.
1845 H Surfaced.

10 January 1944

Patrolling on surface west of DANGEROUS GROUNDS. Made
trim dive.
1150 H Sighted SPRATLY ISLAND bearing 189(T), distance 10 miles.
1200 H Lat 08-46 N Long 111-54 E.
1500 H Departed area about four hours ahead of time designated
in operation order in order to patrol across track of
reported northbound convoy during daylight on 11 January
1944.

11 January 1944

Enroute Fremantle on surface. Made trim dive.
0900 H Reached desired position for days patrol.
0945 H Submerged.
1200 H Lat 06-06.5 N Long 114-18 E.
1842 H Surfaced and continued patrol.
2245 H CREVALLE requested position of CABRILLA on voice circuit.
Did not answer since this considered unnecessary and un-
desirable. Had intercepted CREVALLE message to Comtaskfor
71 requesting rendezvous with CABRILLA for transfer of
patient and expected rendezvous orders via VIXØ.
2315 H CREVALLE still calling and requesting position. Answered
with dawn position in plain language using point "E" of
shipping route information data as reference point.

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U.S.S. CABRILLA (SS288)

2330 H Proceeding to daylight position indicated to CREVALLE.

12 January 1944

Enroute daylight rendezvous with CREVALLE to receive
patient.

0200 H Received serial 7 from Task Force Commander directing
rendezvous with CREVALLE. Proceeding to designated po-
sition via daylight position already indicated to
CREVALLE.

0730 H Sighted submarine bearing 018 relative, distance about
eight miles. Closed range and identified CREVALLE.
Lat 7-15 N Long 115-53 E.

0830 H DEMPSTER, Albert J., 223 63 82, Y1c received on board
via rubber boat from CREVALLE. Diagnosis: acute ap-
pendicitis. Gave data on area and convoy search on
11th to CREVALLE.

0835 H Set course for BALABAC STRAIT.

1125 H Submerged to patrol PALAWAN and BALABAC approaches for
remainder of day and to permit passage through BALABAC
during darkness.

1200 H Lat 7-38 N Long 116-16 E.

1834 H Surfaced.

2130 H Entered LUMBUCAN channel, BALABAC STRAIT.

2310 H Departed BALABAC STRAIT and set course for SIBUTU pas-
sage to pass eastward of CAGAYAN SULU.

13 January 1944

Enroute Fremantle on surface.

0435 H Sighted CAGAYAN SULU ISLANDS bearing 158(T), distance
fourteen miles.

1135 H Passed west of PEARL BANK.

1200 H Lat 05-51 N Long 119-33 E.

1342 H Submerged to patrol northern approaches to SIBUTU pas-
sage for remainder of day and pass through SIBUTU during
darkness. TA'I TAWI not in sight due to low clouds and
rain squalls.

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1510 H Visibility improved, sighted BONGAO ISLAND and fixed
  position.
1833 H Surfaced in SIBUTU passage.
1915 H Departed SIBUTU passage and set course for MAKASSAR
  STRAIT.

                                14 January 1944

Enroute Fremantle on surface.

1128 H SD radar contact moved in from 12 to 11 miles. Submerged
  without sighting plane to avoid detection. Remained sub-
  merged for the rest of the day and maintained high
  periscope watch. Expected shipping with air coverage,
  but apparently the plane was on a routine reconnaissance
  flight. A float type plane had been sighted in this
  vicinity on the way north.
1200 H Lat 01-33 N Long 119-42.5 E.
1818 H Surfaced.
2300 H Passed fourteen miles west of SOUTH WATCHER ISLAND.

                                15 January 1944

Enroute Fremantle on surface.

0523 H Submerged.
1200 H Lat 01-36 S Long 118-38 E.
1826 H Surfaced.
1918 H Radar and sight contact with sailboat. 030 relative,
  range 2000 yards. Avoided.
2051 H Radar and sight contact with sailboat, sails down,
  bearing 270 relative, range 1350 yards. Avoided.
2133 H Radar and sight contact with sailboat bearing 023 rela-
  tive, range 2150 yards. Avoided.
2314 H Radar and sight contact with sailboat, sails down, bear-
  ing 280 relative, range 1850 yards. Avoided.

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16 January 1944

Enroute Fremantle on surface.

0703 H Submerged.

0907 H Sighted trawler type patrol boat bearing 180(T), range
        12,000 yards. Estimated tonnage 500. Had one small
        caliber gun mounted forward and one aft. Apparently
        enroute MAKASSAR CITY to vicinity of LAUT STRAIT;
        course 300, speed 6 knots.
        Lat 04-18 S Long 117-41 E.

1007 H Lost contact with patrol boat.

1200 H Lat 04-22.5 S Long 117-38 E.

1535 H Surfaced.

1820 H Sighted LIMA ISLANDS bearing 251(T), distance 10 miles.

17 January 1944

Enroute Fremantle on surface.

0300 H Indications of radar on same frequency on 3J screen.

0330 H Radar and sight contact bearing 171(T), range 6500
        yards. Indications of another radar were strong 10
        degrees either side of the contact just prior to getting
        a pip at 6500 yards. Believed to be U.S. submarine,
        probably TINOSA. Turned away and commenced tracking.
        Estimated course 020, speed 14 knots.
        Lat 06-57S Long 116-26 E.

0341 H Sighted SEKALA ISLAND bearing 252(T), distance 8 miles.

0343 H Lost radar contact at 9000 yards. Resumed course for
        LOMBOK STRAIT.

0545 H Sighted LOMBOK ISLAND.

0602 H Submerged for day to transit LOMBOK STRAIT during dark-
        ness. On probable traffic route from SURABAYA to AMBON.

1200 H Lat 07-37.5 S Long 116-07 E.

1912 H Surfaced.

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U.S.S. CABRILLA (SS288)

2100 H Entered LOMBOK STRAIT.

2145 H Strong indications of radar on same frequency on SJ screen.

2219 H Radar contact 345 relative, range 4000 yards. Changed
  course to right and increased speed. Range decreased to
  3400 yards during turn - nothing sighted. Commenced
  tracking and estimated course to be 010, speed 17 knots.
  Plot then indicated a radical change away and rapid in-
  crease in range. This contact was made in the narrow
  part of the strait between NUSA BESAR and LOMBOK, which is
  a logical place for a patrol boat. However, the indi-
  cations of another radar on the same frequency plus the
  apparently evading action indicated a U.S. submarine.
  COD was expected in this vicinity.
  Lat 08-40 S Long 115-43 E.
  Lost contact at 8000 yards and resumed course to clear
  LOMBOK.

2310 H Departed LOMBOK STRAIT and set course for FREMANTLE. In
  the southern approach to LOMBOK STRAIT unusually heavy
  swells were encountered suddenly - sea having been calm
  through LOMBOK. Solid green ones over the bridge necessi-
  tated slowing to 10 knots. The sea settled down after
  about two miles as suddenly as it had churned up. Ap-
  parently a strong ebb current through LOMBOK bucking
  the INDIAN OCEAN current caused by southerly winds
  created the disturbance.

18 January 1944

Enroute Fremantle on surface. Made trim dive.

1200 H Lat 11-34 S Long 114-36 E.

19 January 1944

Enroute Fremantle on surface. Made trim dive.

1017 H SD radar contact moved in from 16 to 15 miles; probably US
  plane. Submerged.
  Lat 15-55 S Long 113-14 E.

1100 H Surfaced.

1200 H Lat 16-05 S Long 113-10 E.

20 January 1944

Enroute Fremantle on surface. Made trim dive. Completed
equalizing charge and six hour test discharge.

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U.S.S. CABRILLA (SS288)

1200 H Lat 20-43 S Long 112-04 E.
1700 H Indication of another radar on SD screen.

21 January 1944

Enroute Fremantle on surface.

0805 H Indications of another radar on SD screen.
1140 H Indications of another radar on SD screen.
1200 H Lat 25-17 S Long 111-26 E.
1717 H Possible periscope feather was sighted by the Junior Officer
of the Deck bearing 320 relative, estimated range 3000 yards.
Periscope was not seen but a white streak and spray, which
persisted for about thirty seconds, moving across the di-
rection of movement of whitecaps could have been caused by a
periscope. Took avoiding action and sent serial three to
Commander Task Force Seventy-one.
Lat 26-15 S Long 111-28 E.

22 January 1944

Enroute Fremantle on surface. Made trim dive.

1200 H Lat 29-44 S Long 112-52 E.
1214 H Sighted PBY plane bearing 160(T) on northerly course, radar
range at same time 12 miles. As we were not in the bombing
restricted lane, submerged to let him go by.

1237 H Surfaced.

23 January 1944

Enroute Fremantle on surface.

0500 H Arrived at designated rendezvous and proceeded into harbor,
Fremantle, West Australia. Completed Second War Patrol.

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(C) WEATHER

The weather while in the area (Central SOUTH CHINA SEA) was
bad in general, and was characterized by frequent rain squalls,
variable cloudiness, moderate to heavy swells caused by consistently
strong northeast winds. The visibility was poor about fifty per-
cent of the time, particularly inshore, due to low lying clouds
and surface haze.

On the 30th and 31st of December a 50 knot northeast gale
arose producing 25 foot seas which reduced our ground speed to
zero and pit log speed through the water to 2½ knots, while making
turns for 8 knots and heading into it. The storm center appeared
to pass south of our position, moving in a westerly direction, and
the wind and sea abated after about an 18 hour blow.

(D) TIDAL INFORMATION

The northward passage from LOMBOK to SIBUTU, 8 - 11 Dec-
ember, was assisted by a 1.2 to 2.2 K NE and N set the entire dis-
tance; and the southward run, 14 - 17 January, was assisted by 1.5
and 1.0 K S sets off MANGKALIHAT and CAPE WILLIAM, the rest of the
run being devoid of any appreciable currents. Currents at SIBUTU
and PEARL REEF were SE, 1.0 to 2.0 K, on both passages.

In the SOUTH CHINA SEA, the NE monsoon was well under way,
which resulted in a continuous SW current of 1.0 to 3.0 knots,
varying with the force of the wind but stronger near the east coast
of FRENCH INDO CHINA. However, in the vicinity of the DANGEROUS
GROUND (southern half), the current set northward at 0.2 to 0.8 K
in spite of the NE monsoon. Between ROYAL CHARLOTTE REEF and the
BORNEO coast, sets of 0.5 to 1.0 K W and NW were experienced.

In the GULF of SIAM (southern half), the current set to
the westward at 1.0 K consistently.

(E) NAVIGATIONAL AIDS

No lights were observed.

CAPE PADARAN lighthouse was used during daylight.

CAPE MELVILLE lighthouse was visible at five miles in the
moonlight.

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U.S.S. CABRILLA (SS288)

(F) SHIP CONTACTS

NO. | TIME | LAT. | TYPE | BRG.& | COURSE | HOW | REMARKS
    | DATE | LONG. |      | RANGE | SPEED  |     |
----|------|-------|------|-------||-----|
1.  | 2131 H | 1-08N | Patrol | 318 T | -      | SN  | Avoided
    | 10 Dec | 119-25E| boat(SC)| 3 mi  |        |     |
2.  | 0136 H | 8-15N | Sub  | 280 T | 035    | SN  | Started around and
    | 13 Dec | 116-42E|      | 3 mi  | 14 K   |     | dove when sighted
3.  | 0338 H | 8-26N | Hosp. | 310 T | 215    | Smoke| While making
    | 13 Dec | 116-37E| ship | 12 mi | 15 K   |     | run around
    |      |       |      |       |        |     | closed suffi-
    |      |       |      |       |        |     | ciently to see
    |      |       |      |       |        |     | lighted red
    |      |       |      |       |        |     | cross, & after
    |      |       |      |       |        |     | dawn, white
    |      |       |      |       |        |     | hull, etc.
4.  | 1530 H | 11-07N | 2 AKs| 224 T | 075    | P   | Sank leading
    | 4 Jan  | 109-07E|      | 8 mi  | 6 K    |     | ship; chased
    |      |       |      |       |        |     | second ship.
5.  | 2006 H | 10-40N | 1 of the | 070 T | 075    | R   | One hit sank
    | 4 Jan  | 109-19E| above AKs| 5 mi  | 5 K    |     | or damaged
6.  | 0730 H | 7-15N | USS CRE- | 044 T | -      | SD  | Rendezvous
    | 12 Jan | 115-53E| VALLE| 8 mi  |        |     |
7.  | 0907 H | 04-18S | Trawler | 180 T | 300 T  | P   | receive pat.
    | 16 Jan | 117-41E| type | 5 mi  | 6 K    |     | 500 tons, too
    |      |       | patrol |       |        |     | small for tor-
    |      |       |      |       |        |     | pedoes & too
    |      |       |      |       |        |     | well armed.
8.  | 0330 H | 06-57S | Sub  | 171 T | 020 T  | R   | gun attack.
    | 17 Jan | 116-26E|      | 3 mi  | 14 K   |     | Probably USS
    |      |       |      |       |        |     | TINOSA, a-
    |      |       |      |       |        |     | voided.
9.  | 2219H  | 08-40S | Unident.| 175 T | 010    | R   | Radar on same
    | 17 Jan | 115-43E|      | 2 mi  | 17 K   |     | frequency as
    |      |       |      |       |        |     | SJ, probably
    |      |       |      |       |        |     | COD; avoided.

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(G) AIR CONTACTS

NO. | TIME    | LAT.    | TYPE    | BRG. &  | COURSE | HOW | REMARKS
    | DATE    | LONG.   |         | RANGE   | SPEED  |     |
----||||||-----|
1.  | 0544H   | 6-52S   | MA 71S  | 240 T   | 020    | SD  | Submerged
    | 8 Dec   | 116-30E |         | 3 mi    | -      |     |
2.  | 1619H   | 0-27N   | DAVE    | 206 T   | East   | P   | While submerged
    | 10 Dec  | 118-59E |         | 5 mi    | -      |     |
3.  | 0800H   | 11-27N  | Unident.| -       | -      | R   | Submerged
    | 30 Dec  | 109-33E |         | 11 mi   |        |     |
4.  | 1130H   | 1-35N   | Unident.| -       | -      | R   | Closed from 12
    | 14 Jan  | 119-43E |         | 11 mi   |        |     | to 11; dove.
5.  | 1017H   | 15-55S  | Unident.| -       | -      | R   | Closed from 16
    | 19 Jan  | 113-14E |         | 13 mi   |        |     | to 15; dove.
6.  | 1214H   | 29-48S  | P3Y     | 163T    | North  | SD  | Outside of
    | 22 Jan  | 113-02E |         | 12 mi   |        |     | bombing restric-
    |         |         |         |         |        |     | tion line. Sub-
    |         |         |         |         |        |     | merged to let
    |         |         |         |         |        |     | him pass by.

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(H) ATTACK DATA

U.S.S. CABRILLA Torpedo Attack No. 1 Patrol No. 2
Time 1647 H Date - 4 January 1944 Lat 11-05 N Long 109-10 E

TARGET DATA - DAMAGE INFLICTED

Description: Two loaded AKs in open order column with large port
angles on bow were sighted by periscope watch while submerged
at a range of 16,000 yards, which was the estimated maximum
range of visibility at the time. They were unescorted and
were heading into a fairly heavy sea, not zig zagging. The
course being steered indicated that they were probably enroute
from SAIGON to MANILA on the most direct route.

Ships Sunk: One
Type: AK - Single stick mast, stack, single stick mast,
counter stern. Similar to TONE MARU, page 131,
ONI 208 J.
Tonnage: 4,070

Damage determined by: Observed three torpedo hits and saw
ship sink 5 minutes and 46 seconds after first hit.

Target draft: 24' Course: 072(T) Speed: 6 knots Range: 2200 yds.

OWN SHIP'S DATA

Speed: 3 knots Course: 145(T) Depth: 64 feet Angle: 0

FIRE CONTROL AND TORPEDO DATA

Type attack: Submerged attack at periscope depth. Course and speed
of target was determined by plot and TDC.
It was planned to fire three torpedoes at each AK at a
range of about 1500 yards. Prior to reaching a favorable
firing position the second ship, which was on the port
quarter of the leader, changed course to the right, passed
astern of the leading one and formed a line of bearing of
about 160(T). This maneuver increased the mean range but the
plan to fire three at each still held. However, before reach-
ing the desired position the farther ship drew ahead and over-
lapped the leading one by a half ship's length and it was de-
cided to fire a four torpedo spread using the stack of the
near ship as a point of aim and expecting the spread to take
care of the second ship.

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Two of the first four torpedoes hit the leading, or near,
target. The fourth, which should have hit the second target,
stuck in the tube. It was then decided to fire tubes five
and six at the second target. Number five was observed to
hit the first target, which had been slowed or stopped by
this time, and number six missed ahead of the second target
due to a change of course away after firing.
Torpedoes #1 and #5 were fired on periscope bearings
and numbers 2,3,4, and 6 on bearings generated by TDC,
using a 2° divergent spread.

Tubes fired | 1 | 2 | 3 | 4 | 5 | 6
Track angles | 106P | 107P | 108P | 108P | 112P | 111P
Gyro angles | 2°L | ½°L | ½°R | 2°R | 5°L | 4°L
Depth set | 10' | 10' | 10' | 10' | 10' | 10'
Power | Hi | Hi | Hi | Hi | Hi | Hi
Hit or miss | Miss | Hit | Hit | Miss | Hit | Miss
Erratic | No | No | No | No | No | No
Mark torp. | 14-3A | 14-3A | 14-3A | 14-3A | 14-3A | 14-3A
Serial No. | 23838 | 24259 | 24311 | 22908 | 22902 | 23901
Mark exploder | 6-4 | 6-4 | 6-4 | 6-4 | 6-4 | 6-4
Serial No. | 6719 | 10820 | 6886 | 6887 | 6884 | 6874
Actuation set | Contact and magnetic features operative
Actuation actual | contact | contact | | contact | |
Mark warhead | 16 | 16 | 16 | 16 | 16 | 16
Serial No. | 10325 | 2208 | 1907 | 2239 | 1267 | 368
Explosive | TPX | TPX | TPX | TPX | TPX | TPX
Firing interval | 8 second
Type spread | 2° divergent
Sea conditions | Fairly heavy swells with white caps
Overhaul activity | Navy 137

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Remarks:
Number one torpedo was a spread miss. Number four, which
failed to leave the tube, should have hit the second target
as it was spread to astern of the leader. Number six
missed due to target maneuvers.
Number two was observed to hit forward of the stack of
the leading target, number three observed to hit aft of the
stack and number five to hit directly under the stack.
It is unfortunate that this ship was on the track of the
fifth torpedo since she had already begun to list and was
obviously sinking.
After firing number six tube, number four was fired
again and the torpedo left the tube but was not heard
running.

U.S.S. CABRILLA Torpedo attack No. 2 Patrol No. 2
Time 2314 H Date 4 January 1944 Lat 10-33 N Long 109-47 E.

TARGET DATA - DAMAGE INFLICTED

Description: The remaining ship of the two attacked in the after-
noon was trailed and tracked submerged and then chased on
the surface. Regained contact by radar and sighting at
2006 H and made end around run. Bright moonlight night -
sea conditions same as in the afternoon.

Ships damaged
and probably sunk: One
Type: AK - Single stick mast, stack, single stick mast,
counter stern, similar to NAGANO MARU, page 134,
ONI 208-J.
Tonnage: 3,824
Damage determined by: Heard and felt one timed torpedo hit.
No screws were heard for approximately 14 minutes
after the hit, then screws were heard intermittently
for a period of about 26 minutes. Four minutes after
hearing slow screws pass directly overhead, propellers
stopped and were not heard again. Surfaced and began
search in the direction of the last true bearing. One
hour after screws were heard to stop and failed to re-
gain contact. This ship apparently could not make more
than nine knots under existing sea conditions before
being hit.

Target craft: 24' Course: 075(T) Speed: 5 knots Range: 1050 yds.

OWN SHIP'S DATA

Speed: 3 knots Course: 345(T) Depth: 62 feet Angle: 0

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FIRE CONTROL AND TORPEDO DATA

Type attack: Tracked target by radar on surface and determined
  course and speed, made around run and submerged 10,500
  yards ahead and 3,000 yards from target's track.
  Due to excessive water being taken through leaking con-
  ning tower hatch at radar depth, radar tracking could not be
  continued after submerging. The target was picked up in the
  periscope on the approximate bearing generated by the TDC at
  a range of about 4,000 yards. The approach was continued using
  periscope bearings and estimated ranges.
  A 4° divergent spread of three torpedoes was fired, the
  first being fired on periscope bearing and the last two on
  bearings generated by the TDC.

Tubes fired | 1 | 2 | 3
|---|---|---
Track angles | 87°S | 92°S | 86°S
Gyro angles | 3°L | 2°R | 5°L
Depth set | 10' | 10' | 10'
Power | Hi | Hi | Hi
Hit or miss | Miss | Miss | Hit
Erratic | No | No | No
Mark torpedo | 14-3A | 14-3A | 14-3A
Serial No. | 23061 | 24033 | 24228
Mark Exploder | 6-4 | 6-4 | 6-4
Serial No. | 6700 | 7034 | 6727
Actuation set | Magnetic and contact
Actuation actual | - | - | contact
Mark warhead | 16 | 16 | 16
Serial No. | 2235 | 2211 | 1385
Explosive | TPX | TPX | TPX
Firing interval | 8 seconds
Type spread | 4° divergent
Sea conditions | Fairly heavy swells with white caps
Overhaul activity | Navy 137

- 30 -

— page 72 —
SS288/A12-1
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L

Remarks:
          Torpedo number one was aimed to hit, number two was
          spread 4° ahead and number three was spread 4° astern. Since
          the range was not accurately known at the time of firing any
          one of the three could have hit, giving a torpedo run of
          from 27 to 43 seconds. The target bearing dropped aft after
          firing and it is believed that the first two passed ahead
          and that the third one was the hit.

(I) MINES

          "Nothing observed".

(J) ANTI-SUBMARINE MEASURES

          The ship which was not hit on the first attack on 4 Janu-
          uary 1944, turned away and dropped depth charges, apparently
          intended to set off approaching torpedoes.
          Maneuvers of this same AK after the night attack on the
          same day indicated that he might have sound listening equip-
          ment. It was later decided that this was unlikely and that
          the intermittent use of propellers indicated troubel with
          engines rather than listening and tracking tactics.
          Small caliber gun fire, about 3", at periscope, was used
          by this ship after both attacks.

- 31 -

— page 73 —
SS288/A12-1
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288)

(K) MAJOR DEFECTS AND DAMAGE.

1. Excessive smoking of engines reported on previous
patrol still prevails and is considered a definite detriment to
successful surfaced attacks. Engines cannot be brought up to maxi-
mum power or even speeded up quickly in an emergency without ex-
cessive smoking.
2. Continuous surfaced running at slow speeds on Main
Engines resulted in exhaust valves sticking on several occasions due
to excessive carbon. This was overcome by almost daily lubrication
with penetrating oil and freeing up by working the valves by hand.
3. For the second successive patrol the trim manifold has
developed water leaks through the valves into the trimming tanks.
On occasions water has leaked from sea, which on other occasions
it has resulted in a transfer of water ballast from one trimming
tank to another. It is believed that too soft a metal has been
used in the construction of either valves or seats or both, re-
sulting in excessive deterioration during the period of about half
a patrol.
Similar leaky valves have been experienced for two
patrols in all high pressure air manifolds.
4. A battery discharge at the 6-hour rate was made three
days before the termination of this patrol. The capacity was found
to be 98.4% which was considerably under the expected capacity.
Following the discharge, a normal charge was started but had to be
secured when battery temperature reached 130°F. In eight hours
charging, the finishing rate was not quite reached. A need for
working the battery is indicated and the relief crew will be re-
quested to put in two equalizing charges, twelve hours apart,
followed by a battery discharge.
5. For the second successive patrol the fathometer has
flooded out about midway through the patrol. The frequency with
which this item reappears in patrol reports of other boats suggests
that a more rugged design for submarines is necessary if successful
use is to be made of this instrument.
6. Number 4 torpedo tube has a groove about 10" long
gouged into the muzzle section by a torpedo which failed to eject
properly. The torpedo moved forward far enough for the guide stud
to clear the tube and then was forced back into the tube with the
guide stud out of alignment with the guide slot. Cause of this
casualty is not known. The impulse pressure was checked before
firing; all charging valves and the impulse charging manifold were
closed; popnet operation normal. A thorough inspection and in-
vestigation will be made during the next refit period.
7. Forward group 600# MBT blow manifold developed a deep crack
in the casting by #1 MBT blow valve. This crack necessitated se-
curing of the forward group blow manifold while submerged and a
slow blowing of the tanks when surfacing. The manifold failed
under normal operating pressures which indicates the casting is
faulty and should be replaced rather than repaired.

- 32 -

— page 74 —
SS-88/A12-1
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288)

8. The bow planes make a loud groan and chatter while
being tilted at periscope depth in power and emergency operation.
This condition was reported last refit and supposedly remedied by
a generous greasing. Operation of the planes on the surface or
out of the water does not produce these noises.
9. See addenda on page 36.
(L) COMMUNICATIONS

Radio reception was normal throughout the patrol. No
Jap interference was noted.

First CTF 71 serial received: 32 of 1 Dec.
Last CTF 71 serial received: 35 of 22 Jan.
Last serial sent to CTF 71: 3
One serial missing: 31

(M) RADAR

1. SJ RADAR

The performance of the SJ Radar was very good. During
the homeward passage, once north of LOMBOK and once in LOMBOK
STRAIT on 17 January, interference, presumably from another SJ
appeared on our screen. This interference appeared as a series
of transmitted pulses moving slowly back and forth across screen.
At first the interference was very weak and appeared intermittently,
probably only as the other radar made its sweep over us. Later it
was detected continuously and at saturation, indicating that the
other radar was quite close. Contact was established at 6000 yards
in the first case and at 4000 yards in the second case - both
contacts were probably U.S. submarines although neither was
definitely identified.
No major material difficulties were encountered. An
elusive source of screen noise was found due to an unbalanced
transmitter exhaust blower. A jittery sweep was found due to a
faulty coaxial cable which was intermittently shorting out.

2. SD RADAR

The operation of the SD Radar was very good. Early in
the patrol, routine checks indicated a below normal, and dropping
antenna resistance to ground. Cleaning, and a change of shoe in-
sulators, had no effect on the resistance to ground. No water was noted at the
mast drain plugs. In the course of the patrol the ground dropped
to 35 megohms, but this low resistance had no apparent effect on
the performance of the radar.

- 33 -

— page 75 —
SS288/A12-1
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L

(N) SOUND GEAR AND SOUND CONDITIONS

     1. Sound conditions were normal; no unusual phenomena
were observed.

     2. Materiel

          A. NII Fathometer

               Early in the patrol, the NII head developed a zero
          ground, due either to flooding or burned out insulation.
          As a consequence, this equipment was inoperative during
          the remainder of the patrol.

          B. QB Echo ranging - Listening Equipment

               A hydraulic oil leak developed inside the QB head
          hoisting shaft, causing oil to enter and fill the void
          in the shaft containing the cables which lead to the head.
          Oil under pressure was forced into these cables, causing
          the outside rubber coating to rupture. It is believed
          that oil has entered the heads. No apparent change in
          listening properties of the equipment have been noticed.

(O) DENSITY LAYERS

Date         Long         Lat          Description of Layer
12/27/43     110°53'E     11°07'N      Temperature dropped 5° in 20 feet
Time of day 0720 (-8)                  79° to 74°, 170' to 190'
                                       Did not penetrate layer.

1/4/44       109°18'E     10°40'15"N   Temperature dropped 13° in 162 feet.
Time of day 1600 (-8)                  78° to 65°, 208' to 370'
                                       Drop was at a constant rate for
                                       first 140'. Drop of but 1° in
                                       last 22'.

1/9/44       111°30'E     9°30'N       Temperature dropped 3° in 45 feet
Time of day 1730 (-8)                  81° to 78°, 195' to 240'
                                       Did not penetrate layer.

- 34 -

— page 76 —
- SS288/A12-1
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288)

(P) HEALTH, FOOD AND HABITABILITY

Health of the crew was in general excellent, and no
sick days were lost. The acute appendicitis case received from
the CRIVALLE fared very well on orange juice, morphine, ice cubes,
and sulfathiazole for two weeks, and departed bunk-weary and hungry.
Food was disappointingly lacking in palatability and variety.
At least 75% of the beef used was extremely tough and stringy.
Habitability was very good.

(Q) PERSONNEL

Two experienced officers, including the executive officer,
and seventeen men were transferred to relief crews upon completion
of the last patrol. The officer replacements, although much less
experienced, were entirely satisfactory. Replacements in the case
of inexperienced enlisted men were disappointing. Nine of the new
men were new to submarines, eight of these without experience at
sea in any type ship.
During the early stages of the patrol, about fifty percent
of the lookouts were ineffective due to lack of training, and sur-
prise and emergency dives were somewhat hazardous since diving
stations were necessarily manned by inexperienced men. A Lookout
school and a submarine training device at Fremantle would undoubtedly
be a help.
The state of training at the end of the patrol is considered
to be very good.
The performance of duty of officers and men under combat
conditions was of the highest order.

(R) MILES STEAMED - FUEL USED

| | Miles(RPM) | Gallons of fuel |
| :| :| :|
| Fremantle to area via Exmouth Gulf | 4412       | 41,190          |
| In area                          | 3580       | 21,835          |
| Area to Fremantle                | 3201       | 34,035          |
| Total                            | 11,193     | 97,060          |

(S) DURATION

Days enroute to area and on special mission | 21
Days in area                               | 20
Days enroute to Base                       | 13
Days submerged enroute & special mission   | 12
Days submerged in area                     | 6

- 35 -

— page 77 —
SS288/A12-1
Serial 02
C-O-N-F-I-D-E-N-T-I-A-L

U.S.S. CABRILLA (SS288)

(T) FACTORS OF ENDURANCE REMAINING

| Torpedoes | Fuel | Provisions | Personnel Factor |
|---|---|---|---|
| 12 | 6,000 gals. | 15 days | 15 days |

(U) REMARKS

Due to the strong southerly to southwesterly currents along
the coast of INDO CHINA during the Northeast Monsoon season, it seems
unlikely that northbound shipping would follow the inshore route
except in case of absolute necessity at this time of the year. The
route recommended for low powered steamers from SINGAPORE via
PALAWAN PASSAGE, or via the DANGEROUS GROUNDS appear to be more
logical routes for northbound shipping. The one contact in the
area indicated that shipping from SAIGON may depart from the coast
and take the most direct route to MANILA or the empire.

Numerous voice transmissions were heard on 2880 Kcs at
night, both while enroute and in the CHINA SEA. They were mostly
unintelligible, but occasionally quite clear and distinct.
"Shakespeare", "Dubois", "Oatmeal", "Opal", and "Spotty" were call
names heard frequently in the SULU SEA, CELEBES SEA, and MAKASSAR
STRAIT. The transmissions heard from these stations concerned
course changes only.
The code available for use in case of coordinated attack
was suitable only if in visual contact or the approximate position
of other submarines in the vicinity was known. It is recommended
that reference points be provided for use when not in visual contact.

"ADDENDA TO SECTION K"

(K) Additional item.

9. On last dive of patrol, approximately 18 hours before
arrival, #3 main engine flooded when outboard exhaust valve failed
to close on power and was closed by hand a little late. Since then
all efforts to fire this engine have failed. It is believed that
all water has been removed but that exhaust valves are sticking
open resulting in a loss of compression. Efforts to free up ex-
haust valves have met with only partial success.
Insufficient time remains prior to arrival to definitely
fix the cause of failure to fire. This engine is due for complete
overhaul during the refit period commencing 23 January 1944.

- 36 -

— page 78 —
FC5-16/A16-3
Serial # [HANDWRITTEN: 07]
. C-O-N-F-I-D-E-N-T-I-A-L

SUBMARINE SQUADRON SIXTEEN

U.S.S. RASHER, Flagship,
3 February 1944.

FIRST ENDORSEMENT to
CABRILLA (SS288) Report
of 2nd War Patrol Serial
02 dated 23 January 1944.

From: The Commander Submarine Squadron SIXTEEN.
To : The Commander in Chief, UNITED STATES FLEET.
Via : The Commander Submarines, SEVENTH FLEET.
The Commander, SEVENTH FLEET.

Subject: U.S.S. CABRILLA (SS288) - Report of Second War
Patrol - Comments on.

1. The second war patrol of the U.S.S. CABRILLA
covered a period of fifty four (54) days of which forty two (42)
were spent in enemy-controlled waters and in her assigned area
in the South China Sea. Other than an unidentified submarine
and the hospital ship contacted on 13 December, only two worth-
while targets were contacted and attacks were delivered on both
of these ships. The first undoubtedly resulted in a sinking,
but the second ship although probably damaged took the offensive
causing the CABRILLA to go to deep submergence thereby losing
contact with the target which was not regained. Coverage of the
patrol area was thorough and deserving of more numerous contacts
although operations were somewhat handicapped by general poor
weather. The U.S.S. CABRILLA successfully performed her special
mission in an expeditious and efficient manner.

2. The rendezvous with the U.S.S.CREVALLE on 12
January and the transfer of the sick man to the U.S.S. CABRILLA
via rubber boat was well done. The recovery of this man is
another triumph for sulpha drugs, the Squadron Medical Officer
having diagnosed the case as a ruptured appendix which responded
to treatment with sulfathiazole.

3. Torpedo performance was good. A total of nine
torpedoes were fired with the ship at periscope depth and all
appear to have run normally with the exception of the torpedo
in #4 tube which failed to leave the tube on attack #1. This
is considered a tube or firing valve casualty.

4. The material condition of the ship is excellent.
All defects encountered will be corrected during the current
normal refit period.

5. The Squadron Commander congratulates the Command-
ing Officer, Officers and Crew of the CABRILLA for the successes
attained on this patrol.

[SIGNATURE: J. M. Haines]
J. M. HAINES.

— page 79 —
[HANDWRITTEN: 0]
FE24-71/A16-3                               UNITED STATES NAVY           12/ems
Serial: 0119                                                               February 11, 1944.
                                                               [HANDWRITTEN: 2-01892]
C-O-N-F-I-D-E-N-T-I-A-L
                                                               [HANDWRITTEN: Spare]
SECOND ENDORSEMENT to:
CABRILLA (SS288) Report
of 2nd War Patrol Serial
02 Dated 23 January, 1944.

From:         The Commander Submarines, SEVENTH FLEET.
To:           The Commander in Chief, UNITED STATES FLEET.
Via:          The Commander, SEVENTH FLEET.

Subject:      U.S.S.CABRILLA (SS288) - Report of Second War
              Patrol - Comments on.

              1. The remarks of the Commander Submarine Squadron
SIXTEEN are complete and are concurred in.

              2. This patrol is considered successful for purpose
of awarding the Submarine Combat Insignia. The Commanding Officer,
Officers and Crew of the CABRILLA are congratulated on inflicting
the following damage on the enemy:

              SUNK
              1 - AK (TONE MARU TYPE) - - - - - 4,070 Tons

              DAMAGED
              1 - AK (NAGANO MARU TYPE) - - - - - 3,824 Tons

                                                               R. W. CHRISTIE.

DISTRIBUTION:
Cominch             (3) - Direct
Vice Opnav          (2) - Direct
Vice Opnav
Op-23c              (1)
ComlstFlt           (1)
Com2ndFlt           (1)
Com3rdFlt           (1)
Com7thFlt           (1)
Comsubs1stFlt       (2)
Comsubs2ndFlt       (1)
CTF-71              (4)
CTF-72              (2)
CSS-16              (1)
Divcoms Ron-16(1)
Each S/M W.A. (1) - NOT TO BE TAKEN TO SEA - BURN
                                                               [SIGNATURE: P. F. Straub Jr.]
                                                               P. F. STRAUB, Jr.,
                                                               Flag Secretary.
[HANDWRITTEN: OK]

— page 80 —
[HANDWRITTEN: 844]
UNITED STATES FLEET
COMMANDER SEVENTH FLEET
[STAMP: Reg. No. 2847]
[STAMP: R.S. No. 018177]

A16-3/(P-6/cw)
Serial: [HANDWRITTEN: 0873]

[STAMP: 18 APR 1944]

C-O-N-F-I-D-E-N-T-I-A-L

THIRD ENDORSEMENT to:
CO USS CABRILLA Conf.
ltr. Serial 02 dated
23 January 1944.

From: The Commander SEVENTH FLEET.
To : The Commander in Chief, United States Fleet.

Subject: USS CABRILLA - Report of Second War Patrol.

1. Forwarded.

[SIGNATURE: R.H. Cruzen]
R. H. CRUZEN,
By direction.

[HANDWRITTEN: Original]

— page 81 —
U.S.S. CABRILLA (SS288)
Care of Fleet Post Office,
San Francisco, California.

SS288/A16-3
Serial 6
DECLASSIFIED
[UNCLEAR: CONFIDEN]T-I-A-L

12 April 1944.

From: The Commanding Officer.
To: The Commander in Chief, U.S. Fleet.
Via: Official Channels.

Subject: U.S.S. CABRILLA (SS288) - Report of
War Patrol Number Three.

Enclosure: (A) Subject report.

1. Enclosure (A) covering the Third War
Patrol of this vessel conducted in Sunda Strait
during the period 6 March to 12 April 1944 is
forwarded herewith.

W.C. THOMPSON.

[STAMP: DECLASSIFIED]

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
B: [HANDWRITTEN: OP-09B9C] DATE [HANDWRITTEN: 5/25/82]

[HANDWRITTEN: X]

— page 82 —
CONFIDENTIAL

(A) PROLOGUE

CABRILLA arrived Fremantle, W.A. 23 January
1944 from second war patrol. Refit, which
included docking, completed by Submarine
Repair Unit #137 on 6 February 1944.

6 February Commander D.T. Hammond, U.S. Navy relieved
by Lt. Comdr. W.C. Thompson, Jr., U.S. Navy
as Commanding Officer.

6 February to 15 February.
Completed loading. Conducted day and night
training, deep dive, calibration degaussing
and post repair trials. Fired practice
torpedoes including one from #4 tube. This
tube had been damaged by war shot not
leaving tube completely on second Patrol.
Fathometer head flooded again on deep dive.

17 February
1300(H) Completed final loading. Fathometer head
repaired and reinstalled. Departed Fremantle
for Training Area Affirm.

1600-2300 Fathometer tested satisfactorily on deep
dive. Made numerous day and night approaches
and two battle surfaces, firing all guns.

REMARKS ON TRAINING

The two additional days accorded new
commanding officers were most beneficial.
I found the CABRILLA crew exceptionally
well trained - a compliment to the former
commanding officer and the Executive Officer
Lt. Comdr. H.D. Sipple, USN.

This vessel was able to approach each of the
three targets assigned her ridiculously
close on all night approaches without being
sighted (400 - 600 yards). For the much
needed lookout training of refit crews and
to commanding officers a truer picture
of visible distance, I recommend two
properly equipped lookout teams be assigned
each target when conducting day and
particularly night exercises. (I was able to
see RASHER at 2,500 yards). Our battle
surfaces on target towed by CHANTICLER
were failures because we were unable to see
the target in the rough seas.

-1-

— page 83 —
(B) NARRATIVE

17 February
2300         With Rottnest Light bearing 145°T, distant 21
             miles departed training area in accordance
             with ComTaskFor. Seventy One Operation Order
             No. 21-44 of 15 February 1944, for patrol area
             via Darwin and bombing restriction lane.

18-23 February
1200         18th Lat. 29-40S Long. 113-24E
             19th      24-29        112-10
             20th      19-28        113-42
             21st      17-03        118-05
             22nd      14-08        122-32
             23rd      12-36        127-11
             Conducted training dives and drills. Constant
             helm superimposed on reasonably long zig legs
             during daylight.

24 February
1200         1. Lat. 12-33 S Long. 127-19
0056         Returning as ordered to Fremantle to replace
             damaged port propeller. How or when damage
             occurred is unknown to anyone aboard.

25-29 February
1200         25th Lat. 14-13 S Long. 122-31 E
             26th      17-02        117-52
             27th      19-51        113-28
             28th      24-36        112-34
             29th      29-28        113-18
             Returning Fremantle idling port shaft.
             Constant helm on zig plan during daylight.
             Conducted training dives and drills.

1 March      Approaching Fremantle harbor.
170735       Entered marine railway.
2318         Undocked after changing port propeller.
2333         Moored in nest alongside U.S.S. ORION.

2-4 March    Moored in nest alongside U.S.S. ORION.
             Making preparations for sea.

5 March      Underway for training exercises in area
0830         "Cast".

-2-

— page 84 —
NARRATIVE (CONTINUED)

6 March
        Surface and submerged approaches in area
        "Cast".
0445    Returning Fremantle Harbor.
0742    Moored in rest alongside U.S.S. ORION.
1300    Departed in accordance with ComTaskFor Seventy
        One Operation Order No 27-44 of 6 March 1944
        for patrol area via Exmouth on track 100 miles
        west of bombing restriction lane. Zigzagging
        during daylight.

7 March
1200            Lat. 28-48 S Long. 112-53 E
0300    BEAVER, Paul, Jr., TM2c stricken with acute
        appendicitis (his first attack)
0611    Submerged remaining in proximity of Geraldton
        to await developments - too rough for PBY
        here.
0900    Patient much improved, surfaced, continued
        toward Exmouth, zig-zagging during daylight.
        Conducted training dives and drills.
1935    C/c 305 patrolling west of bombing restriction
        lane enroute Exmouth.

8 March
1200            Lat. 25-14 S Long. 109-38 E
0535    Reached patrol lane c/c to 006ºT, 2 Eng.
        speed. Made dawn trim dive.
0857    C/c 300 for new patrol station to arrive
        dawn following day.
1230    SD contact 15 miles, closing rapidly.
        Visibility 3 miles, ceiling about 3,000 feet
        and hazy and not in bombing restriction lane,
        but decided to identify plane if possible.
        Sighted PBY (Contact #1) at 2 miles and
        exchanged recognition signals.

9 March
1200            Lat. 22-00 S Long. 106-46 E
        Made dawn trim dive on station, commenced
        patrolling 090-270ºT at two engine speed
        reversing course every two hours. Noted
        intermittent SJ interference from 2300 until

        -3-

— page 85 —
NARRATIVE (CONTINUED)

9 March
0400 In direction of and assumed to be
BONEFISH. Using A.R.C. after dusk.

10-11 March
1200 10th Lat. 22-04 S Long. 106-33 E
11th 22-00 ? 106-46 E
Patrolling 090-270° at 2 engine speed
reversing course every two hours. Made dawn
trial dive, gradual 7° negative gradient to
test depth. Using A.R.C. after dusk. Again
[UNCLEAR: no] interference.

12-13 March
1200 12th Lat. 21-59 S Long. 106-49 E
13th 16-14 S 106-56 E
Conducted training dives and tracking drill.
1200-12th C/o for Sunda Strait via Christmas Island.
Plan reconnoitre Christmas Island during
afternoon 14th and close it during dark of
moon.

14 March
1200 Lat. 10-51 S Long. 106-08 E
Conducted training dives.
1400 ... Closed Christmas Island to 15 miles, submerged
and closed to 2 miles. Carefully scouted east,
north and northwest coasts; entered Flying
Fish Cove. Cupboard bare. Took several
pictures. Departed dusk. On surfacing 6 miles
away after dark, two searchlights were
illuminated. One light apparently on point
near radio tower at settlement on Flying Fish
Cove; other halfway up hill above largest
building. Lower light very bright and appeared
as horizontal bank of eight lights; upper
light single and relatively weak. Lights were
trained to seaward and on clouds, water, land,
etc - possibly a signal. There is a small
well kept settlement grouped near radio tower
with possibly one or two guns on point.
No indication of radar masts or of radar on
A.R.C.

15 March
1200 Lat. 07-27 S Long. 104-58 E
0800 BEAVER, Paul, jr., TM2c returned to duty.
No operation.
-4-

— page 86 —
NARRATIVE (CONTINUED)

15 March
0900 Dived on sighting "Lily" type bomber (Plane
     Contact #2). Conducted training exercises
     submerged.
1012 Surfaced.
1315 Submerged for training drills and to approach
     Sunda St. unobserved. Checked for air and oil
     leaks.
1625 Sighted "Lily or Sally" type bomber (Plane
     Contact #3).
1925 Surfaced. Heading into strait from south to
     be well clear of HMS TANTIVY and cover
     southern approaches.
     Night is very dark and overcast, yet islands
     distant at 25 miles are clearly visible and one
     peak at 50 miles is distinguishable.
     Decided patrol about 10 miles SSW of Krakatoa
     on 310 - 130 T covering southern entrances
     and checking currents.

16 March
0630 Submerged 10 miles SSW of Krakatoa Island.
1200 Sighted sailboat bearing 060°T, 6,000 yds.;
     it remained in sight until 1800 disappeared
     to SW.
1955 Surfaced; set course for the northern
     entrance (narrows).

17 March
1200 Lat. 06-08 S Long. 105-40 E
     Patrolling 325-145°T reversing course hourly.
     8-10 miles SW Thwartway Island.
0632 Submerged.
0945 JP reported light screws bearing 177°T.
0956 Sighted masts (ship contact #1), bearing 170°T
     8,000 yards. Est. course 055. Battle stations.
1015 Broke off approach upon identifying ship as
     small interisland auxiliary schooner with two
     heavy masts, single stack and unusually large
     bowsprit. Possibly small net tender of about
     500 T. however large bowsprits are common
     in this area; apparently unarmed. Took picture.

-5-

— page 87 —
NARRATIVE (CONTINUED)

17 March
2003         Surfaced. Retired on 230°T due brilliant
             lighting and several close unidentified radar
             contacts believed to be mostly sailboats and
             debris.

2355         Strong odor of honeysuckle near Krakatoa Is.

18 March
1200         Lat. 06-04 S Long. 105-39 E

             Patrolling 230-050°T reversing course hourly.
             8-15 miles SW Thwartway Island.

0304         Avoided radar contact believed to be small
             boat.

0627         Submerged...9 miles SW Thwartway Island.

0924         Sighted masts (ship contact #2) commenced
             approach, range 7,000 yards, bearing 046°T.
             Broke off approach upon identifying small 500
             Ton. 2 mast, single stack interisland freighter.

1506         Sighted sailboat 4

1717         Sighted single mast (ship contact #3) bearing
             058°T, range 6,000 yards. Commenced attack.
             Broke off approach; ran silent, avoided at
             1,500 yards when identified as SC or PC
             patrol boat. Nine fathoms of water under the
             keel at 66 feet. However after approaching
             with 0 angle on the bow to about 2,000 yards
             we reversed course and departed on about
             050°T.

1952         Surfaced. Patrolling 335-145°T 8 miles SW
             Thwartway Island. Sighted signalling from
             Thwartway Island.

2135         Avoided radar contact believed sailboat.

19 March
1200         Lat. 06-04 S Long. 105-39 E

             Patrolling 145 -325°T reversing course hourly.
             8-10 miles SW Thwartway Island.

0114         Avoided radar contact of 1,500 yards, believed
             to be sailboat.

0627         Submerged. Favoring channel east of Thwartway
             for Batavia traffic.

-6-

— page 88 —
NARRATIVE (CONTINUED)

19 March
1456
Sighted single mast (ship contact #4) thought
possibly Nip sub. entering strait from north,
range 10,000 yds. Commenced approach. At
range of 3500 yds. and while periscope down,
target headed toward. Realized then and
observed he was SC. Rigged for silent running
and depth charge attack. Attempted to evade
at periscope depth but angle on bow always
close to zero.

1545
Headed for 100 feet. Target passed directly
overhead as we were passing 70 ft., but no
depth charges. Bravely went to 120 feet in
22-24 fathoms of water with uneven bottom.
No gradient. Secured all equipement except
JP, including IC and gyro, but still could not
shake him.

At 1830
tide changed and many strong eddy
currents and water noises were set up;
steering and depth control very difficult.
His screws faded to southward.

1900
Periscope depth, all clear.

1958
Surfaced. Clearing area to patrol 300-120°T
during darkness between Krakatoa Is. and
Princes Is. Hydraulic accumulator started
groaning when charging and continued to do so
throughout patrol despite our best efforts
to quiet it.

20 March
1200
Lat. 06-00 S Long 104-59 E

Patrolling between Krakatoa and Princes Is.
on courses 300-120°T reversing hourly.

0200
Shifting station to arrive dawn 13½ miles
bearing 138°T from Tabuan Is.

0633
Submerged on new station. Found beautiful
very steep 18° negative gradient just below
230 feet.

1115
Sighted smoke (ship contact #5) bearing 291°T
est. 35,000 yards distant; believed on land.
However set possible solution on TDC selecting
target course from chart, came to normal
approach course. Surface is flat as a mirror.

1148
Smoke still believed to be on land but
increased speed to 2/3.

-7-

— page 89 —
NARRATIVE (CONTINUED)

20 March
1220         Sighted 2 stick masts and stack of ship
             smoking heavily. C/c to 030° to trap target off
             Berak Pt., Sumatra. A/a full. Battle stations.
             Estimated range about 20,000 yards. Observations
             made at 2/3 speed; 80 - 100 ft. for full speed.

1244         Observation. Sound picked up targets screws.
             Target course 050°T, speed 8 kts. A/a full.

1251         Slowed to 4 kts. for periscope observation at 65ft.
             Using 90 ft. mast head height. A/a full.
             Range about 5,500 yds. Changed target course to
             060°T.

1306         Stopped at 100 ft. to check with sound bearing.
             Sound (JP & JB) insists 140 RPMs. Slowed target
             to 7 kts. on sound bearings. A/a full.

1313         Observation. Setup good, gaining bearing. A/a
             full. Range about 3,000 yards.

1317         C/c to 020°T to close track faster.

1321         Observation. No escort and no planes. Set tubes
             on 7 ft. Target identified as similar to
             Katyosan Maru (2500 tons). Range about 2,200 yds.

1324         Steady on 350° to close for 100° stbd. track,
             and 1,000 yd. torpedo run. Observations at 64
             ft. while ship is stopped. Made ready tubes 1,
             2, 3. Unable obtain sound range. Sound bearings
             beginning to differ with T.D.C. setup so at
1326         up periscope. Target had changed course toward
             us. Previous data had been entered. A change
             of target course to about 080°T was expected
             due to navigation but not so soon. [HANDWRITTEN: Trying for]
1327         up the [UNCLEAR: quick] shot. Target passing about 300 yds.
             ahead Port ahead flank, stbd, ahead full. Shut outer
             doors.

1333         Steady on 090°T. Had crossed targets track,
             angle on bow 170° P.

1334         A/a 1/3. With target on course 080°T, speed 6½
             kts. track 164°P. an excellent sound range of
             1,000 yds., and periscope check bearing for
             each shot, Fired tubes 1, 2, 3. First two
             torpedoes were heavy smokers and all missed
             astern.

1336         Chasing at full speed for another salvo.

-8-

— page 90 —
NARRATIVE (CONTINUED)

20 March
1338: Two explosions 15 sec. apart then 3 more
(torpedoes?).

1340 100 feet, still chasing. 2 more explosions,
then two more. Had not seen escort or plane
but sound reported "fast" screws bearing 180°
true. Went to test depth under 14° negative
gradient - just in case - and continued chase.
C/c left to open distance to track as target
must be dropping charges off stern.

1342 Explosion.

1344 Stopped to check sound bearing of target.
Heard nothing. A/a full. Coming to periscope
depth.

1350 Passing 100 ft. JP reported pinging. Sound
bearings check fair on target. Made ready
4, 5, 6 tubes except outer doors.

1354 Explosion. C/c to 070° T.

1356 Explosion. Gravity reported (erroneously) to
be 1.138. Decided to fire without furthur chase,
target had c/c to 050° T., range 3,000 yds.
Using 7 kt target speed and 160° P. track,
fired 4, 5, 6 tubes. All were heavy smokers.
I was using periscope spread but apparently did
not make it clear to T.D.C. operator. First
torpedo must have missed astern but it
was very close. Second torpedo with ½° L.
aimed ahead missed well ahead.
Seeing second torpedo to be wide I aimed
third at left tangent of target. With its
½° R spread it also barely missed astern.
I am convinced that except for this spread
error the second and third would have hit.
The discrepancy has been well discussed and
I believe will not occur again.

1358 Target smoking heavily. C/c to 160° T. Went
to 200 ft for reload.

1401 Two explosions about 30 sec. apart (torps?).

1406 Explosion.

1410 Unusually heavy explosion.

-9-

— page 91 —
NARRATIVE (CONTINUED)

20 March
1445   Gravity 1.148 corrected, however longer chase
       hardly practicable. Secured Battle Stations.
       Resumed patrol. Expected patrols within 3 hours
       but none developed - not even a plane. Perhaps
       target had no radio and gave the alarm visually
       to Thwartway Is. on passing through the narrows.
       Target had two heavy cables astern and armed
       guard in whites on after gun. No damage was noted
       by depth charges (believed 11 in all plus 5
       torpedo explosions) although some shock the boat
       and broke two supposedly shock proof light
       globes.

2005   Surfaced. Set course to patrol during night
       and following day between Princes Is. and
       Krakatoa Is. to let shallow water at narrows
       cool off one day.

2255   Avoided 2,800 yd. radar contact.

21 March
1200   Lat. 06°-24' S Long. 105°-18' E.

0209   Radar contact; believed to be sailboat and
       again at 0500. Avoided 1,500 yd. contact;
       believed to be sailboat.
0625   Submerged.

2007   Surfaced.

2300   On reaching finishing rate of battery charge,
       set course for narrows.

22 March
1200   Lat. 06°-07' S Long. 105°-39' E.

0420   Patrolling SE - NW reversing course hourly.
       9 miles bearing 230° T from Thwartway Is.

0620   Submerged.

1200   Sighted smoke bearing 350° T. Closed at 2/3
       speed for one hour. True bearing did not change
       except for our motion. Assumed smoke on land,
       slowed to 1/3 speed.

1410   Sighted smoke bearing 035° T. Closed at 2/3
       speed for twenty minutes. Bearing did not
       change and chart indicated smoke in dangerous
       waters or on land. I believe even a small
       vessel, particularly a smoker, would have been
       spotted passing through narrows.

-10-

— page 92 —
NARRATIV CONTINUED)

22 March
2005 Surfaced. Closed Thwartway Is. to 8 - 10 miles,
     resumed 320 -140° T. hourly reversal patrol.

23 March
1200 Lat. 06°-05' S Long. 105°-42' E

0455 Passed small banca, no sails, close aboard. We
     were easily visible.

0619 Submerged.

1558 Sighted "Lily" or "Sally" type plane close
     aboard (Plane contact #4) apparently searching
     strait. Went to 100 ft. for 30 minutes.

2008 Surfaced. Sighted much driftwood throughout
     day including logs, requiring careful use
     of periscope. Avoided several close radar
     contacts, believed to be driftwood.

24 March
1200 Lat. 05°-59' S Long. 105°-40' E

     Patrolling 310 - 130° T., reversing course
     hourly, 8 - 10 miles SW Thwartway Island.

0216 Radar contact (ship contact #6) Bearing 014° T.,
     range 11,000 yds. Manned Battle Stations.
     Commenced tracking and closing at standard
     speed on 4 engines. We were trimmed down to
     14" freeboard to reduce visibility.

0238 Determined target speed to be 10.5 kts., course
     generally 070° T. but conforming to channel.
     Unable to attack prior passage through narrows
     and, with Stroom rock supposedly awash on my
     present course in the narrows, decided to
     follow target through strait then attack.

0300 Sighted target smoking heavily, range 7,000 yds.
     Water very phosphorent. Severe sheet lightning.

0312 On course 070° T. with problem checking nicely,
     range to target 4,800 yds., closing. Stroom Rock
     about abeam to stbd. and no worries except
     4kt. current. O.O.D. sighted object (ship
     contact #7) bearing 010° T. Radar then produced
     a range of 3,000 yds. In brilliant lightning
     O.O.D. observed last contact to have destroyed
     lines but was smaller. Bearing rapidly increased to
     045° T. range 1700 yds. QB heard this target's
     light screws though we were at std. speed.

-11-

— page 93 —
NARRATIVE [UNCLEAR: C]ONTINUED

24 March
0312 Did not want to close Patrol by turning to so
0316 Right full rudder, port ahead full, slow, back-
     ing 2/3. Apparently missed Stroom rock. Put
     Patrol vessel astern and stopped. Range 2,800
     not closing and bearing drawing to eastward.
     Did not have setup to fire at patrol vessel
     and also did not believe him to be torpedo
     target except as last resort due to his size
     and shallow draft. Kept original target
     generating on T.D.C. with occasional check
     range and bearing .

0321 Range to original target 9,800 yds.

0325 With patrol vessel range about 4,500 yds.
     bearing still drawing right, decided to attempt
     passage through narrows again, this time
     hugging Sumatra coast. Right full rudder a/a
     std. on course 000° T.

0334 SJ reported indications of another radar, not
     similar to SJ interference , all clear on A.R.C.
     C/c to 0360° T. to transit narrows.

0337 Patrol vessel closing again, bearing 060° T.,
     range 4,000 yds. drawing left. Severe lightning.

0345 Patrol vessel closed to 2500 yds and flashed
     small red light in our direction (similar to
     type attachable to our binoculars). Radar
     found another pip bearing 240° T., range 3,000
     yds. (own speed 16 kts) - - and still
     Stroom rock. Figured I was trapped but no gun
     fire from patrols on beach so swung right again
     and dodged the 240° T. pip. Sound could not
     pick up screws on latter bearing. Would have
     swapped 10 years for a P.P.I.

0400 C/c to 200° T.

0408 Radar contact 5,000 yds, bearing 160° T. and
     several pings (I wonder) on sound gear. Avoided.

0409 Began (and I since believe incorrectly) to
     consider these narrows hot.

0410 Fwd. Torp. Rm. reports jar as tho we hit log
     Confirmed by after room, probably submerged or
     semi-submerged driftwood and it may have hit
     screws with little or no damage.

-12-

— page 94 —
NARRATIV CONTINUED)
24 March
0418 Reluctantly gave up the chase for the following
      reasons:

1.  Did not desire gun battle with one, two or
    possibly three patrol vessels, and did not
    believe contact torpedoes would hit patrol sighted.
2.  In lightning flashes and with visibility existing
    I am almost certain we could not have made
    passage undetected, certainly not within half hours
    time.
3.  Too late to run eastward of Thwartway Is. and
    only 3,000 yds between Stroom rock and
    Thwartway Island.
4.  I had lost target and did not know whether
    his destination was north, North east or east
    (probably north). With dawn shortly after 0600
    I do not believe end around practical.
5.  I did not want to be below periscope depth in
    these waters for any length of time with current,
    uneven bottom and navigational dangers. Nor
    could transit narrows before daylight submerged.
6.  Believed target smaller than 3,000 tons and,
    with no other radar contacts in addition to
    the patrol sighted I did not believe possible to
    gain worth the risk.
7.  Once north of narrows could not have returned
    prior to next evening and possibly not then
    unless overcast.

0600 Sighted possible flat-top, closed and identified
     as Tiga Island.
0620 Submerged bearing 245° T, 24,000 yds from Thwart-
     way Island. Was pulled out of desired position
     by Tiga Is. contact.
0943 Sighted large sailboat (est. 200° T.) headed
     SW through strait, and several small fishermen.
1045 JP sound reported light screws bearing 315° T.
     came to 030° closed at full speed at 80'ft.
1107 until periscope observation at 55 ft. still
     revealed nothing.

-13-

— page 95 —
NARRATIVE (CONTINUED)

24 March
1107      However JP insisted bearings changed to 047°
          true and may have been serial 4. I believe
          this improbable however.

1920      Sighted possible smoke bearing 185° T.
          distance about 35,000 yds.

2005      Surfaced c/c to 055° to intercept possible
          smoke. No futher evidence.

2105      Observed signalling on Hout Is.

2106      Radar and sight contact bearing 080°,
          range 3,600 yds. Avoided. Believed medium
          sailboat without sails as sound heard no
          screws. Radar lost contact after 4,000 yds.

2300      Radar contact 296° T., 3,400 yds. Avoided.

2327      Lost contact at 4,300 yds. Believed sailboat.

25 March
1200      Lat 05°-57' S Long. 105°-46' E

          Patrolling 150 -330 ° T. reversing hourly 8
          to 10 miles SW Thwartway Is. favoring west
          channel. I was convinced most of larger
          traffic uses this channel passing between
          Sebesi and Sebuku or north of Sebuku and
          hugging Sumatra coast in narrows.

0618      Submerged about 8,000 yds off Sumatra coast
          in channel.

0708      Sighted large sailboat (est. 200 tons)
          headed ST through channel.

0710      Observed structure on Winsor Is. believed
          to be radio or radar tower.

1025      Several small sailboats in sight.

1334      Sighted Inter-island steamer (ship contact
          #8), bearing 344° T., range 7,000 yds.
          headed NE hugging Sumatra coast. He is a
          very ill-kept small sea truck, stack aft.
          No apparent armament. Est. 800 tons.
          Beautiful gun target. Closed range to
          3,000 yds for closer inspection. Took
          picture.

-14-

— page 96 —
NARRATIVE (CONTINUED)

25 March
1411 Sighted patrol vessel (ship contact #9) PC
     type bearing 090° T., range 6,000 yds. Angle
     on bow zero. Attempted evade at 2/3 speed.

1418 Periscope range closed to about 3,500 yds. Rigged
     for silent running.

1423 Observed range decreased to 1,500 yds. Rigged
     for depth charge. Angle on bow 10 port.
     Attempting get off his track keeping him
     astern. No pinging. Slowed to 50 RPM's.

1426 With SC on constant bearing, planed to 100
     ft. in 26 fathoms of water. Kept SC astern
     and he passed on by. est.range 800 - 1000 yds.
     Bearings and sound intensity indicate he
     plowed back and forth a couple of times then
     departed not too suspicious.

1455 Screws very faint. Coming to periscope depth.

1503 All clear. Believe SC was on routine patrol
     East then south then west of Thwartway Is.

1600 Considerable driftwood including a few skinned
     sawed logs sighted throughout day.

1822 Sighted smoke (ship contact #10) bearing 060
     range about 25,000 yds. entering straits
     hugging Sumatra coast. Commenced approach.

1848 Still tracking smoke. Am in awkward position,
     dark approaching rapidly, target to eastward
     and with land background. Unless situation
     changes materially plan to attack on surface
     after dark.

1857 Several scattered sailboats in sight,
     closest 2,000 yds. Target has two masts with
     rigging to each. Probably for sails; single
     stack. Range about 12,000yds angle on the bow 15
     port. #1 periscope stuck in raised position.
     Battle stations.

1919 Target bearing 055° T. Distance off track
     3,000 yds. Plotted in navigational position for
     close maneuvering. #1 periscope fixed.

-15-

— page 97 —
NARRATIVE (CONTINUED)
25 March
1926 Target not seen again through periscope,
      thought almost continuously raised. Target
      was never heard on sound (JK and JP). Dark
      moon in west.

1935 Broke off approach. Opened coast for quicker
      surfacing.

1955 Radar depth.

2006 All clear. Surfaced. Chasing target between
      Sebesi and Sebuluis. on 4 engines. Secured
      Battle stations.

2035 Headed fair for Sebesi - Sebuku passage when
      radar developed contact 026° T, range 11,000
      yds. Believing this to be new and NE bound
      target. Decided to knock this one off before
      it could reach narrows then chase westbound
      target. Commenced approach. Battle stations.
      Trimmed down.

2051 Target radars stopped about 1,000 yards off
      beach. Maneuvering for Sebuku for background
      Several small radar contacts 3000 - 4200 yds.
      Debated disregarding these pips to track and
      search. Though apprehensive of closing
      4200 yd pip astern.

2055 Target bearing 018, range 6700 yds. Now headed
      north of Tiga Is.

2105 Target bearing 010, range 4200 yds. Pip
      indicates two masts.

2109 Radar indicates another target 1000 yds beyond,
      believed mine lobe. With Sebuku as our background
      and target in open decided close for identification
      then double back south of Tiga and shoot after
      target settled on SW course. Target frequently
      shows glow of white light, probably on his
      chart desk. Target speed 8 kts.

2111 Closed to 1,750 yds. Target very small,
      maximum length 160 ft. angle on bow about
      90° port. Continued to observe target for
      about 15 minutes, not smoking. Definitely
      not torpedo target. Broke off attack and cut
      south of Tiga Is. at slow speed, blowing
      ballast tanks dry. Apparently they have not but
      think we may have mined this area. Secured
      Battle stations.

-16-

— page 98 —
NARRATIVE (CONTINUE)

25 March
2128 Chasing original target at full speed headed west
beating the bushes about 6,000 yds off. Several
momentary thrills on small islands along coast
but nothing productive. Easily outran several
2 -4000 yd. radar contacts. Crossed south of
Tabuan Is., Closing Benkulen Peninsula. Cannot
believe target has left strait yet.

26 March
1200 Lat. 05°-58' S Long. 105°-49' E

0042 Chasing target of Sumatra coast. With Cape Redak
bearing 330°, distance 8,000 yds, doubled back
straight across gulf on 076° T.

0127 Radar contact 080° T., range 8,000 yds. Started
tracking.

0137 Closed range to 4,500 yds. Radar indicates two
targets (Ship contact #10 & #11)

0142 Battle stations. Lowered stbd. sound head.
No Pinging.

0206 Opened range too much. Lost targets at 7,500
yds. Closed to 6,000 yds. Sound is more
efficient than radar on these targets except
for ranges. Reported light fast screws.

0223 Target course 280° T. speed 7 kts. Using Tabuan
Is. for background commenced attack. Range
3,700 yds. Selected larger ship with lines of
small man of war as target. The smaller target
is small interisland steamer. Smoking very little
Setup looks good.

0229 Closed range to 2,100 yds. 90 stbd. track.
Target appears very small. Checked time.
Decided maximum target length 160 ft. and not
worth torpedoes. Closed range to 1,600 yds.
for verification, then cleared at full speed
direct for Tabuan Is.
I believe larger target was SC or PC. he
dismissed his ward at Lat 05-58 S Long. 104-54 E
and c/c to about 103° T. speed 10 kts.
Smaller steamer rounded Benkulan Peninsula and
disappeared - an excellent gun target.
In retrospect, I believe ship sighted at dusk,
ship escorted off Tiga Is., and ship escorted
all the same vessel. He was observed to have
large masts.

-17-

— page 99 —
* NARRATIVE NTINUED
26 March I think he stopped at dusk, possibly waiting
for escort. Therefore sound did not hear him.
I can not understand his not smoking after
dark unless he reduced speed. Radar always
clearly picked up the masts but not the stack.
My guess is he is an auxiliary schooner of
about 600 tons and was escorted for morale
purposes.

0246 Secured from Battle stations. Decided patrol
off Cape Redak for remainder of night and next
day. Not enough time to reach narrows before
dawn. Resumed battery charge.

0627 Submerged. Sharp 16° drop in temperature below
205 feet.

0651 Sighted PC patrol (Ship contact #12) bearing
087° T., range about 8,000 yds. on NW course.

0754. PC disappeared bearing 007½°.

1252 Sighted PC patrol bearing 326° T., range 6,000
yds. Believed same as 0651 contact. Avoiding
at 2/3 speed.

1306 Rigged for silent running. Minimum range about
2,000 yds.

1419 Sighted smoke (ship contact #13) bearing about
033° T. GABRILLA and PC headed for smoke.

1425 Secured from silent running.

1441 Smoke identified as auxiliary schooner est.
200 tons, on westerly course.

1500 PC continued on easterly course and disappeared.
Hope I have three spare fish, flat seas and
deep water for this nuisance on 5 April -
probable misses, but my morale - hm.

1955 Surfaced. Will spend three hours this area
then proceed narrows again by more probable
striking force route south of Krakatoa Is.
Have been off this route for 30 hours.

27 March Lat. 06-02 S Long. 105-40 E.

0610 Submerged about 8 miles SW Thwartway Is.

-18-

— page 100 —
NARRATIV CONTINUED)

27 March
1335 Sighted signal station and control post on
      Eastern mound of Thwartway Is., also
      several scattered sailboats.

1954 Surfaced. SJ Radar out of commission.
      Retiring to westward until radar is repaired.

2050 SJ Radar back in commission. Patrolling
      between Krakatoa and Java until lightning
      abates. Avoided several radar and sight
      contacts 1500 - 4000 yds. Several scattered
      severe thunder storms illuminated the area.

28 March
1200 Lat. 06-05 S Long. 105-39 E.

0200 C/c to 0400 T. to close narrows.

0400 Patrolling narrows 130°- 340° T.

0615 Submerged about 7½ miles SW Thwartway Is.

1400 Battle Problem and tracking drills. Much
      driftwood and the inevitable sailboats
      throughout the day. Currents noticeably
      stronger during last few days.

1955 Surfaced. Patrolling narrows 290°-100° T.
      until moonset. Avoided numerous 1,000 yds. radar
      contacts - probably debris.

29 March
1200 Lat. 06-04 S Long. 105-38 E.

0218 Developed 5,000 yd. radar contact into rain-
      squall. Avoided several closer radar contacts;
      two believed sailboats, others debris.

0617 Submerged 7½ miles SW Thwartway Is. Sighted
      usual sailboats and one at 1030 closed to
      1,000 yds. restricting observations
      somewhat for about 40 minutes.

1950 Surfaced. Patrolling 120-300° half hour legs
      10 miles SW Thwartway Is.

30 March
1200 Lat. 06-05 S Long. 105-38 E.

      Avoided usual close radar contacts - debris probably
      or small sailboats.

-19-

— page 101 —
NARRATIVE (CONTINUED)
30 March
0618 Submerged.

1130 Sailboat closed to about 500 yds. restricting
     periscope observations for 1 hour.

1530 JP sound reported and sighted PC type patrol
     (ship contact #14) bearing 097° T., range
     6,000 yds. on approx. course 220° T.

1536 Rigged for silent running. Increased speed to
     50 turns for better evasion. Avoided;
     minimum range about 2,500 yds.

1617 Secured from silent running. PC departed east
     and south of Krakatoa for first time.

1850 Sighted smoke bearing 038° T. C/c to 335° to
     close west passage.

1911 Last glimpse of smoke bearing 043° T. Made ob
     observations at 55 ft. But no mast seen.
     Two puffs were sighted at one time, possibly
     indicating two ships. Visibility excellent in
     this direction until 1930.

1950 Surfaced. Decided to close Sumatra coast to
     eliminate west passage. Headed for Tiga Is.
     Moon bright, visibility excellent.

2034 Sighted small object bearing 290° T. est.
     range 4,000 yds. Since we were getting radar
     ranges on land behind him at 10,000 yds, believed
     him to be sailboat. Avoided.

2051 After ascertaining no targets on Sumatra side
     and delaying until even slow speed target
     would have entered narrows, headed for east
     channel, passing 10,000 yds. south Thwartway.

2100-2110 Passed through rainsquall.

2130 A/a full. C/c to 200° T to search Java coast
     8 - 10,000 yds offshore. Visibility excellent
     except to westward in small rainsquall.
     Observed narrows all clear. Passed occasional
     small rainsqualls which are very minor obstacles
     to visibility.

2336 Closed Behoud Passage to 10,000 yds, all
     clear. C/c to 340°

-20-

— page 102 —
NARRATIVE (CONTINUED)

31 March
1200 Lat. 06-04 S Long. 104-46 E

Searching for target at full speed, course
340° T. covering Princes Is.

0020 C/o 045° doubling back toward Krakatoa.

0100 C/o 275° after ascertaining east channel all
clear. Now headed for Cape Redak just in case
we missed him after surfacing.

0333 C/c 350° T. slowed to 7 kts. Patrolling off
Cape. I now believe smoke was headed for
Batavia. We searched all medium and slow
speed positions and, if hi h speed, he should
have become visible before or on surfacing.

0514 Investigated 4,000 yd. radar contact. Ident-
ified as very small with zero speed, and,
after daylight saw it was large floating tree.

0620 Submerged off Cape Redak.

1950 Surfaced. C/c to 115° T. at std. speed to
patrol between Princes and Krakatoa Is.

2205 Investigated two small dark objects off
Sumatra coast - small islands. Visibility
excellent.

2230 Noticeable sulphur fumes, believed from
Krakatoa. (12 miles upwind.).

1 April
1200 Lat. 06-03S Long. 105-40 E.

0105 Set course for narrows at 7 kts. Moon has
set but visibility excellent.

0610 Submerged about 7½ miles SW Thwartway Is.
Water is about 10° warmer in narrows than
off Cape Redak.

1303 Sighted PC type patrol (ship contact #15)
bearing 032° T., range about 7,000 yds.
Avoided at 2/3 speed.

1420 PC disappeared bearing 317° T. probably
headed for Cape Redak. Minimum range
4,000 yds.

-21-

— page 103 —
NARRATIVE (CONTINUED)

1 April
1615 Discolored water, much debris and couple of
     sailboats.
1954 Surfaced. Patrolling 115-295°, 8 - 12 miles SW
     Thwartway Is.
2100 Signalling on eastern end Thwartway Is.

2 April
1200 Lat 06-07 S Long. 105-38 E
     Avoided several unidentified radar contacts
     1300 to 4000 yds. believed to be debris and two
     sailboats.
0610 Sighted dark object between us and Hout Is., not
     in radar range. Submerged, commenced approach.
0622 Object definitely a ship, possibly PC or
     sailboat. Rigged for silent running. Constant
     bearing. No sound contact.
0645 Object identified as fairly large single-masted
     sailboat, range 2,500 yds. Secured silent running.
     Sighted three additional sailboats during day.
1953 Surfaced in brilliant moonlight. Noted insistent
     signalling on Thwartway - same characters each
     time apparently a challenge directed at us.
     Range about 7 miles. Visibility excellent but
     wonder if he actually saw us.
2027 Thwartway signalman ceased challenging.
     Retiring toward Krakatoa, half-expecting a patrol
     boat soon.
2050 Again call or challenge from Thwartway for about
     3 minutes. Range now 11 miles.
2128 Sighted small patrol or power boat bearing 150°T,
     range about 7,000 yds. Avoided. Decided dive
     between Krakatoa and Princes Is. tomorrow at
     dawn, due to brilliant moonlight, possible
     challenging and appearance of possible patrol
     boat at 2128.
2302 Decided make another search toward narrows
     before dawn.

-22-

— page 104 —
NARRATIVE (CONTINUED)

3 April
1200                                Lat. 06-21 S Long. 105-22 E

0100 Narrows clear of traffic, retiring on course
     225° T.

0228 Patrolling 090-270° T. between Krakatoa and
     Princes Is. Reversing course half-hourly.

0624 Submerged. 8° drop in temperature 120-210 ft.

1952 Surfaced.

4 April
1200                                Lat. 06-04 S Long. 105-42 E.

     Patrolling between Krakatoa and Princes Is.

0215 Set course for narrows to arrive after moonset.

0525 Avoided SJ and sight contact, 1,550 yds. -
     small boat.

0617 Submerged 8 miles SW Thwartway Is.

1022 Sighted small single masted steam launch (ship
     contact #16) (200 tons) bearing 045° T. range
     8,000 yds. on approx. course 100°T.

1032 Sighted small tugboat (ship contact #17) (200
     tons) with boat (50 tons) in tow on bearing
     028° T. range 7,000 yds. course 250° T.

1744 Sighted smoke bearing 059° T. est. range
     35,000 yds. observations at 53 ft. Commenced
     approach. Assuming target using east passage.

1753 True bearing indicates smoke in approximately
     same location.

1900 Smoke no longer visible, bearing still same
     locality.

1915 Scattered rainsqualls but clear toward target.

1920 SJ radar depth to insure target does not pass
     undetected between us and Fourth Pt., Java.

1940 Surfaced in heavy rain. Closed Java coast to
     8,000 yds. then at -

1948 c/c 025° T. toward Thwartway searching for target.
     Rainsquall passed to southwest.

                                   -23-

— page 105 —
NARRATIVE (CONTINUED)
4 April.
2009 Persistent signalling from Thwartway in our
direction, runs about 14,000 yds. Dark background
behind us, visibility excellent toward Thwartway.
No one was ever observed to answer his signals.

2030 After exhausting even very slow speed possibilities
for target, c/c to 210° T. and searched at full
speed 10,000 yard off Java coast toward Behouden
Passage. Cannot believe target got by but do not
want to take chance. Visibility improving rapidly.

2135 Investigated 2700 yd. radar contact - sailboat.

2312 Behouden Passage observed clear. c/c to 330° T.
to double back at 2353 toward Krakatoa on 045° T.

5 April
1200 Lat. 06-00 S Long. 104-50 E.

0007 East channel all clear. Set course for Cape Redak.

0220 Slowed to 10 kts. patrolling N-S reversing course
hourly off Cape Redak and south of Tabuan Is.

0625 Submerged after another disappointing chase.
(I now believe smoke must have come from near
Pulomerak, N.W. Java distance over 40,000
yds and from a stack.

1956 Surfaced. Beating bushes at 14 kts. off Sumatra
south and S.W. coasts.

2320 Cleared CABRILLA Serial One. Reversed course.

6 April
1200 Lat. 08-11 S Long. 105-05 E.
Searching Sumatra Southwest and south coasts at
14 knots headed for Cape Redak.

0235 With Cape Redak bearing 340° T, distance 15,000
yds. departed area for Christmas Is. at 14 kts.

0627 Zigzagging.

0700 Sighted "Lily" or "Sally" type bomber headed
directly for us, course 300° T., range about
4 miles. Submerged.

0745 Surfaced.

1915 Ceased zigzagging.

-24-

— page 106 —
NARRAT E (CONTINUED)

6 April
2245 Sighted Christmas Is. ahead, distance 30 Miles.

2343 With nearest land 25,000 yds, a/a full to
eliminate smoking later. Plan to enter Flying Fish
cove near center on 180° T. until obtaining
land background then head toward settlement.

7 April
1200 Lat. 12-07 S Long. 106-46 E.

0000 A/a std. to reduce white spray. Moon hidden
under large cloud.

0010 Closed to 6,000 yds when cloud uncovered moon.
All buildings and shore were outstanding in
brilliant moonlight. Carefully searched with
radar. No shipping present. No apparent
activity and no lights anywhere. A/a full
cove and working to northward.

0045 Investigated radar contact bearing 282° T.
range 9,000 yds at full speed. Target
immediately disappeared despite search.
Believed to have been minor lobe on radar.

0123 With NE tip of Christmas Is. bearing 235° T.
distance 7,000 yds set great circle course
for northern end bombing restriction lane.

0628 Dawn trim dives.

0646 Surfaced.

8 April
1200 Lat. 15-59 S Long. 109-49 E

Conducting training dives.

9 April
1200 Lat. 20-07 S Long. 112-59 E

Conducting training dives and drills.

1046 Sighted northbound U.S. Submarine, believed
to be COD, bearing 117° T., distance 8 miles.

1130 Entered bombing restriction lane, c/c to
186° T. started zigzagging during daylight.

-25-

— page 107 —
NARRATIVE (CONTINUED)
10 - 11 April
1200 Lat. 25-23 S Long. 112-20 E
     29-51 S 113-37 E.

     Conducting training dives and drills.
     Zigzagging during daylight.

1329-10th Sighted smoke bearing 120° T, distance 18
     miles.

0643-11th Sighted and exchanged calls with U.S.S.
     ROBALO.

12 April
0730 Arrived off Fremantle Harbor. Conducted sound and
     magnetic survey range runs.

1100 Entered harbor and moored to port side of PELLIAS.

-26-

— page 108 —
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— page 110 —
(F) CONTACTS (CONTINUED)

Apparently ships over 2000 tons seldom use Sunda
Strait. Small auxiliary schooners, launches and sea trucks
handle the shipping. The channel west of Thwartway Island
and close to the Sumatra side seems to be used exclusively.
I do not believe the straits are mined although no "hips"
were sighted using the East channel. One small ship was
trailed north of Tiga Island headed west, so apparently
they fear our mines or submarines in other more direct
routes. Upon clearing Legundi Island they head directly for
cape Redak probably hugging the coast from there on.

(G) AIRCRAFT CONTACTS
| Time | S Lat | Type | Range | Course | How | Remarks |
| Date | E Long | | (mi) | Speed | | |
|---|---|---|---|---|---|---|
| 1 1230H | 25-10 | Friend- | 15 | 120 | R | Exchanged |
| 8 Mar | 109-33 | 1 PBY | | 150k | | recog. sig. |
|---|---|---|---|---|---|---|
| 2 0859H | 07-53 | "Lily" | 4 | 215 | SD | Dived |
| 15 Mar | 105-00 | | | 200k | | |
|---|---|---|---|---|---|---|
| 3 1625H | 07-10 | "Lily" | 6 | 090 | P | |
| 15 Mar | 104-54 | or | | 200k | | |
| | | "Sally" | | | | |
|---|---|---|---|---|---|---|
| 4. 1558H | 06-05 | "Lily" | 9 | 075 | P | |
| 23 Mar | 105-40 | or | | 200k | | |
| | | "Sally" | | | | |
|---|---|---|---|---|---|---|
| 5 0700H | 07-10 | "Lily" | 4 | 300 | SD | Dived |
| 6 Apr | 104-40 | or | | 200k | | |
| | | "Sally" | | | | |

-29-

— page 111 —
(H).
USS CABRILLA Torpedo Attack No.1 (a&b) Patrol No. 3.
Time-1334(H) Date 20 March 1944 Lat.05-53S Long.105-04E.

Target Data - - Damage Inflicted

Description: Single, unescorted AK similar to Katyosan
Maru (2500 tons).except shorter stack and
closer to bridge, low composite or split
superstructure, and possibly no crosstrees
on masts. Sighted smoke through periscope.
Visibility excellent, seas glassy.

Ship Sunk or Damaged None.
(a) (b) (a) (b) (a)
Target Draft 16' Course 080 050 Speed 6½ 7 Range 1000
(b)
3000

OWN SHIP DATA
(a) (b)
Speed Course 090 070 Depth 65' Angle 0

Fire Control and Torpedo Data

Glassy seas plus long, high speed chase handicapped
periscope observations. Speeds over 4kts. created a surface
wash in this flat water at 65 ft. I planned to fire three
torpedoes, 100°s track, 800 - 1000 yds. range with 3°
divergent speed. The 30° change of target course toward at
about 1500 yds. range caused target to pass ahead within
arming distance of the torpedoes and inside of our turning
circle. I fully realize my fatal error in not detecting
this course change earlier thus permitting easy (1) stern
tube shots; (2) down the alley shot; or (3) shorter range
170° P track. As it was, however, I believe a large track,
zero gyros preferable to large gyros, better track with an
uncertain T.D.C. setup. Using first 90 ft. and later 75 ft.
mast head height my ranges were high during tracking.
Fired 3 torpedoes in salvo (a) using 3° divergent spread,
1,000 yd. excellent sound and periscope range, 170° P
track. This should have covered at least a 3 knot error in
speed, yet for causes unknown, all missed astern. Chased
and increased target speed to 7 kts. Fired salvo (b) 160°
P track, 3,000 yds. range, periscope spread plus an
accidental 3° divergent spread. Points of aim were NOT
¼ length ahead, left tangent of target. First and third
torpedo missed astern, the second well ahead. I thought
the second torpedo erred until discussion revealed the
double spread. I considered further chase surface or
submerged impracticable.

-30-

— page 112 —
(H) CONTINUED
                 (a)        (b)
           #1     #2     #3     #4     #5     #6
Tubes Fired - #1     #2     #3     #4     #5     #6
Track Angle - 164 P  165    165    158P   159    160
Gyro Angle  - 6R     5R     5½R    1R     ½R     1½R
Depth Set   - 8      8      8      7      7      7
Power       - Hi     Hi     Hi     Hi     Hi     Hi
Hit or Miss - miss   miss   miss   miss   miss   miss
Erratic     - No     No     No     No     No     No
Mk. Torpedo - 14-3a  14-3a  14-3a  14-3a  14-3a  14-3a
Serial No.  - 25859  40579  40491  24290  22894  24754
Mk. Exploder - 6-4    6-4    6-4    6-4    6-4    6-4
Serial No.  - 7817   6187   6530   6714   10513  6876
Actuation Set- C      C      C      C      C      C
Mk. Warhead - 16     16     16     16     16     16
Serial No.  - 1543   3789   11690  11448  10239  11036
Explosive   - TPX    TPX    TPX    TPX    TPX    TPX
Firing Int. - 8sec   8      8      8      8      8
Type Spread - divergent (½L,0,½R) divergent and periscope
                                          (See remarks)

Sea Cond.   - calm sea.
Overhaul Act.- Subsco
Remarks:    - All torpedoes except #3 tube were heavy
              smokers. Reasons for misses first salvo
              unknown. Misses in second salvo were
              due to double spread inadvertently applied
              by fire control party. All torpedoes ran
              hot, straight, normal except for smoke.

-31-

— page 113 —
**(I)**
MINES.
Sunda Strait had been reported mined.
However this vessel's track and observations indicate
very strongly that no mines exist except possibly ( not
probably ) between Thwartway Island and Java. No mine-
sweeping operations were observed. A track chart is
being submitted with this report.

**(J)**
ANTI-SUBMARINE MEASURES.
During the search on 19 March, PC apparently
heard and changed course for us at 3,500 yards passing
directly overhead. However we had not yet rigged for
silent running. Nothing new in his methods but we could
not lose him until tide changed and water noises increased.
He dropped no depth charges.
The merchantman attacked on 20 March dropped
several depth charges.
No echo ranging was heard during the patrol
although QB sound gear was manned on the surface and QB
and JK while submerged.
Anti-submarine measures were very ineffective
in this area.

**(K)**
MAJOR DEFECTS AND DAMAGE.

1.  Bridge - CT - Inter-communications.
    Efficient communications between these
    stations is, and has been for several years, essential, yet
    to date no reliable system has been developed. This vessel
    has experimented with several types of bridge speakers
    without success. A pressure-proof speaker designed and
    installed by Lt. L.W. OTT, USN repair officer of U.S.S.
    ORION is the most promising, however due to failure of our
    office type amplifier system this speaker has not had a
    fair trial. At present this vessel uses a water-proofed
    sound power handset connected by an easily detachable
    female socket to two pressure proof mounted male plugs.
    A set of male plugs is installed at each T.B.T., the
    Conning Tower outlet is at T.D.C. and manned by Executive
    Officer. This system is fairly satisfactory and very
    reliable except it handicaps the Commanding Officer with
    a hand set to hold and a short cord to keep clear, in
    addition to constant use of binoculars.

2.  Vibration Submerged.
    Excessive vibration and heavy rumbling
    noise is noted at speeds greater than two-thirds submerged.
    This vibration is believed to be in the periscope shears
    and bridge structure and should be eliminated in new
    construction.

-32-

— page 114 —
(K) MAJOR DEFECTS AND DAMAGE (CONTINUED)

3. SJ Radar Upper Bearing.

The clearance in the upper bearing of SJ
radar mast on this class of Portsmouth built boats is
excessive. The SJ head vibrates violently at speeds over
18 kts. when the rudder is used and is believed to
vibrate at high speeds submerged.

4. Vapor Compression Still.

Midway during the patrol a salt water leak
into the fresh water side of #1 still developed. Ship's
force dismantled #1, silver soldered #10 coil (inboard)
in three places and reassembled still. Difficulty was
experienced in reassembly which was completed only after
the removal of one spacer from each coil. At present the
still operates satisfactorily tests showing no salt
present in the condensate. Due to deterioration of coils
from operation and three acid baths since original
installation it is deemed advisable to replace all ten
coils in #1 still. Total hours on still to breakdown is
1051. Present total hours is 1120.

5. Target Bearing Transmitters.

The luminous paint on the T.B.T.'s has been
completely inactive for the last two patrols. Resurfacing
the T.B.T.'s has been requested by this vessel during each
refit since November 1943, yet on departure 6 March 1944
no corrective action had been taken due to lack of the
proper paint. It is seldom necessary to read the bearings
in darkness if the T.B.T.'s can transmit bearings
electrically. However on flooding or casualty to T.B.T.
system, it is essential to be able to read the target
bearings at the T.B.T. and verbally send them to the TDC.

6. Bow Planes.

The tilting box on the bow plane "A" end
Waterbury speed gear does not return to neutral
properly after putting the desired tilt on the planes.
This causes continuous pumping of the "A" end and
creeping of the planes. The control piston shows
signs of scoring. This packing is apparently cocked and
binding and has foreign matter in it. Possibly the
centering spring for the tilt box is broken or weakened.

-33-

— page 115 —
(K)
MAJOR DEFECTS AND DAMAGE (CONTINUED)

7. HYDRAULIC ACCUMULATOR.

During the last refit, the accumulator piston
was pulled, some deep scratches honed smooth and packing
renewed. The print specifies "Leather, mineral tanned,
similar to VIM" with flax or hemp filler. The removed
packing (installed by Navy Yard, Portsmouth) was not
leather. Due to unavailability of the specified type,
"Garlock" packing was used as a substitute. After three
weeks after repacking, the accumulator started groaning
deeply on charging and light scoring noted on piston.
Slacking off on packing gland and thorough oiling of
packing and moving parts failed to remedy trouble. Possibly
this type packing is too hard and inflexible, also the
hydraulic system apparently contains grit as minor scoring
is occurring on other pistons.

(L) RADIO.

Radio reception was normal. All serials were
received. In transmitting our Serial One on 8470kcs as
prescribed, VIX asked for repeats on 6 groups. Likewise,
their "IMI" was difficult for us to read due to heavy Jap
interference during transmissions and shortly thereafter.
The interference consisted of powerful rythmic keying,
evidently designed to aid their D/F efforts and to block
our communications.

(M) RADAR.

1. The operation of the SJ Radar has been satisfactory.
The major material difficulty occured in the gradual
breakdown of the porcelain insulation around "L-3", the oil
filled inductance in the transmitter. This breakdown was
indicated by corona discharge from the inductance to the
nearby metal brackets. The discharge was intermittent for
a period of about a week and then continuous until one of
the metal supporting brackets of L-3 was removed, which
then eliminated the trouble. Complete loss of sensitivity
(echoes) resulted during this arcing; no other indications
were evident in the appearance of the sweep or the
transmitted pulse.
All other material difficulties were minor.

2. Due to the daily submerged patrol, the SD radar
was used only enroute to and from the area. In these periods,
when in the proximity of land, the radar has indicated
adequate sensitivity on the land targets. However, on two
occasions lookouts have reported sighting planes which
have moved in to 3 to 4 miles and an 8° position angle
without radar contact. Complete circuit checks and
replacement of all tubes has not resulted in an apparent
change in operation.

-34-

— page 116 —
(M) AR (CONTINUED)
Officers did not have time to verify either of
these contacts.

(N) SOUND

Sound conditions in the operating area were good.
Though the water was not deep, it was very calm and
listening ranges were on occassion exceptional. On the
ship contact March 17th, the J.P. sound gear reported
a range of approximately 10,000 yds,
and before periscope contact was made. In the attack
March 20th sound ranges up to 1100 yards were obtained.
In all contacts, the JP gear detected the target before,
and retained contact later, than the supersonic sound
gears.
The hand training gear pinion on the QO - JK head
meshes improperly with the power drive gear. With use,
the gears became excessively noisy and it became necessary
to remove the hand training gears.

(O) DENSITY LAYERS.

The following density layers were found during the
course of this patrol:

Date. | Long. | Lat. | Time | Description.
------|||------|
3/15/44 | 105°-00' E | 07°-20' S | 0400 | 10° Drop from 300'
      |                 |                 |      | to 340'. Not
      |                 |                 |      | penetrated.
3/15/44 | 105°-02' E | 08°-05' S | 2200 | 9° Drop from 240'
      |                 |                 |      | to 340'. Not
      |                 |                 |      | penetrated.
3/18/44 | 104°-40' E | 06°-00' S | 2250 | 18° Drop from 265'
      |                 |                 |      | to 340'. Not
      |                 |                 |      | penetrated.
3/20/44 | 105°-00' E | 06°-00' S | 0600 | 19° Drop from
      |                 |                 |      | from 280' to 345'.
3/25/44 | 104°-50' E | 06°-00' S | 2240 | 15° Drop from 205'
      |                 |                 |      | to 285'. Temp.
      |                 |                 |      | steady from 285'
      |                 |                 |      | to 310'.
3/26/44 | 105°-20' E | 06°-20' S | 2245 | 11° Drop from 250'
      |                 |                 |      | to 310'. Not
      |                 |                 |      | penetrated.
4/4/44 | 105°-20' E | 06°-22' S | 0000 | 9° Drop from 110'
      |                 |                 |      | to 205'. Not
      |                 |                 |      | penetrated.

-35-

— page 117 —
(P) HEALTH, FOOD, AND HABITABILITY

Health of the crew was in general good, but
there is a noticeable decrease in their energy, interest
and alertness on a submerged patrol such as this one, as
compared to one spent mostly on the surface.
Two bed patients were treated for six days
each. BEAVER, Paul J., TM2c suffered a first attack of
acute appendicitis on the first night out. Sulfathiazole,
ice packs, liquid diet and rest brought him back to duty
with no apparent ill effects. SMITH, W.L., TM1c was turned
in on 2 April with acute PHARYNGITIS, and treated with
Sulfathiazole, Dobell's solution, and a plentiful supply
of liquids.
Food was much enjoyed by all hands, due to the
improved quality and variety available this time, and to
the exceptional abilities of SHOPP, J.N., CCS(PA), USN,
who is undoubtedly the most popular man aboard (and is
not due for transfer). No change was made in the routine
except evening meal was served at 1930.
Habitability of the boat was good except for
the frequent periods of silent running, which adequately
illustrated the primary value of Air Conditioning. It
is hoped that the efficiency of the plant can be improved
during the refit, since all of our experimentation still
does not produce as cool a boat as others of this class.

(Q) PERSONNEL

New men received for this patrol turned out to
be far better submariners on the average than previous
groups. Possibly we are enjoying the fruits of the much
needed weeding out policy especially in the refit crews;
certainly they are more and better submarine school
graduates these days.
Only one man is considered temperamentally
disqualified. The remainder of those being left in are
strictly for rest purposes following the four patrol
rotation system.
Quiet a few old hands found shallow water
patrolling hard on their nerves. This is probably a very
potent factor on the endurance of any submarine crew,
although its effects cannot be specifically ascribed.
Nine officers were carried on this patrol
and worked out very successfully. The advantages of a
"decoder" and some rotation of jobs for better training
exceed the disadvantages of a little crowding. However,
our C.P.O.'s gave up their bunk room before the first
patrol, so accommodation was not a problem.
The performance of both officers and men on this
not-too-exciting patrol was all that could be desired.

-36-

— page 118 —
-37-
(R) MILES STEAMED - FUEL USED.
Fremantle to area = 2585 miles, 30,250 gallons.
In area 2760 miles. 21,900 gallons.
Area to Fremantle = 1955 miles. 22,400 gallons.
Totals = 7300 miles. 74,550 gallons.

(S) DURATION.
Days enroute to area

— page 119 —
(U)
R.MARKS.
In planning this patrol I made the following
assumptions:

1. Radar, periscope and probably JP sound should
   detect capital ships at 20,000 yards (or their
   screws at 9,000 yards).
2. A large task force would have destroyer
   screens and not smaller vessels and would use the
   east channel, especially after passing through
   narrows, because of greater sea room, deeper water
   and a more direct route to South or South east
   objectives;
3. Relatively high speeds would be used rendering
   listening by screws useless and echo ranging
   necessary to detect submarines;
4. Warships would probably be using radar;
5. and the transit of the strait would
   probably be at night and not without previous
   air and surface patrol of the strait.

Therefore patrolling was done with QB, ARC
and of course SJ manned on surface; JP and QB
sound plus periscope submerged. Periscope
observations were made at 60 feet or less every
ten minutes except when briefly restricted by
sailboats, planes, evasion, etc. Bow planes were
secured at least every 10 - 15 minutes for
increasing JP sound detection. ARC never detected
any external indications. Station was maintained
based on the above assumptions except when seeking
targets.

Several beautiful gun targets were allowed
to pass due to the nature of this patrol.

-38-

— page 120 —
UNITED STATES NAVY

FC5-16/A16-3
Serial # 0245
18 April 1944.

FIRST ENDORSEMENT to
CO CABRILLA Conf. Ltr.
SS288/A16-3 serial 6
of 12 April 1944 Report
of War Patrol No. 3.

From: The Commander Submarine Squadron SIXTEEN.
To : The Commander-in-Chief, United States Fleet,
Via : (1) The Commander Submarines SEVENTH FLEET.
 (2) The Commander SEVENTH FLEET.

Subject: U.S.S. CABRILLA (SS288) Report of Third War Patrol -
 comment on.

 1. The third war patrol of the U.S.S. CABRILLA extended over
the period March 6 - April 12, 1944, a total of 37 days, of which 21 were
spent in the patrol area in SUNDA STRAIT. This was the first patrol of
the Commanding Officer in that capacity. Despite the hazards of confined
and shallow waters, CABRILLA conducted an efficient scouting patrol and
reconnoitered FLYING FISH COVE, CHRISTMAS ISLAND, while enroute to and
from the area.

 2. Only two contacts with worthwhile torpedo targets were made.
CABRILLA conducted a submerged approach on the first of these, an unescorted
freighter of about 2,500 tons, but was forced to fire a 170° track due to
a change of course of the target. Three torpedoes were fired and all missed
astern. CABRILLA chased submerged and fired a second salvo of three tor-
pedoes at a range of 3,000 yards, track 150°. All torpedoes missed. On
the second contact, an escorted freighter, CABRILLA was unable to gain an
attack position before the target had reached the narrows of the strait.
Considerable patrol craft activity was encountered and on one occasion
CABRILLA was detected and chased but was able to evade when sound conditions
were rendered unfavorable by a change of tide. Due to the assigned task
on this patrol, several run targets were allowed to proceed unmolested.

 3. The CABRILLA returned in good material condition and it is
expected that she can be refitted in the normal time. The hydraulic
accumulator will be repacked with an acceptable split ring packing. Al-
though "Garlock" is on the approved list, experience indicates that con-
siderable difficulty is encountered in its use.

 4. Health and morale of the officers and crew is excellent.

 5. The Squadron Commander congratulates the Commanding Officer,
officers and crew on the conduct of this arduous patrol and shares with
them their regret that no damage was inflicted on the enemy.

[SIGNATURE: H.H. McLean]
H.H. McLEAN.

[HANDWRITTEN: X]

— page 121 —
FE24-71/[HANDWRITTEN: (A16-3)]
Serial: 0390

C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
USS CABRILLA Conf. Ltr.
SS288/A16-3 Serial 6
dated 12 April, 1944.
Report of Third War
Patrol.

From: The Commander Submarines, SEVENTH FLEET.
To : The Commander in Chief, UNITED STATES FLEET.
Via : The Commander SEVENTH FLEET.

Subject: U.S.S. CABRILLA (SS288) - Third War Patrol -
Comment on.

1. The remarks of the Commander Submarine Squadron
SIXTEEN are concurred in.

2. CABRILLA very thoroughly and most effectively
fulfilled her primary mission of conducting a reconnaissance
patrol of SUNDA STRAIT. The absence of really worthwhile
torpedo targets indicates that this Strait is used very little
by the enemy for large ship passage between the JAVA SEA and
INDIAN OCEAN. The many patrol boat contacts indicate the
enemy is most anxious to deny the use of SUNDA STRAIT to Allied
forces.

3. This patrol is designated as "Not Successful"
for purposes of award of the Submarine Combat Insignia.

4. The Force Commander congratulates the Commanding
Officer, Officers, and Crew on the excellent manner in which
this difficult and trying reconnaissance patrol was conducted.

5. No damage was inflicted on the enemy.

[SIGNATURE: R. W. Christie]
R. W. CHRISTIE.

DISTRIBUTION:
(O next page.)

[HANDWRITTEN: X]
- 1 -
UNITED STATES NAVY
26 April 1944.
12-bt
022818
ORIGINAL COPY

— page 122 —
FE24-71/A16-3
Serial: 0390
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
ComSubPac ltr.
Ser 0000 Serial 6
dated 12 April, 1944.
Report of Third War Patrol.

Subject: U.S.S. CABRILLA (SS288) - Third War Patrol -
         Comment on.

DISTRIBUTION:
Cominch (3) - (Direct)
Vice Opnav (2) - (Direct)
Vice Opnav Op-23c (1)
ComlStFlt (1)
Com2ndFlt (1)
Com3rdFlt (1)
Com7thFlt (2)
ComSubslstFlt (4)
ComSubs2ndFlt (4)
ComTaskFor-71 (4)
ComTaskFor-72 (2)
ComSubRon-12 (1)
ComSubRon-16 (1)
DivComs Ron-12 (1)
DivComs Ron-16 (1)
S/M School N.L. Conn. (2)
Each S/M W.A. (1) - NOT TO BE TAKEN TO SEA - BURN

[SIGNATURE: K.Z. [illegible]]
P. F. STRAUB, Jr.,
Flag Secretary.

- 2 -

— page 123 —
UNITED STATES FLEET
COMMANDER SEVENTH FLEET

A16-3(F-3/roj)
Serial: [HANDWRITTEN: 01126]

C-O-N-F-I-D-E-N-T-I-A-L

THIRD ENDORSEMENT to
USS CABRILLA Conf. ltr.
SS288/A16-3 Serial 6
dated 12 April 1944.
Report of Third War
Patrol.

From: The Commander SEVENTH FLEET.
To : The Commander in Chief, UNITED STATES FLEET.

Subject: U.S.S. CABRILLA (SS288) - Third War Patrol.

1. Forwarded.

[STAMP: Reg. No. OM-4435]
[STAMP: R.S. No. 022818]

12 MAY 1944

[SIGNATURE: R. H. Cruzen]
R. H. CRUZEN,
By direction.

[HANDWRITTEN: X]

— page 124 —
U.S.S. CABRILLA (SS288)
Care of Fleet Post Office,
San Francisco, California.

SS288/A16-3
Serial 8                                                              9 June 1944

[TYPED: DECLASSIFIED] [STAMP: S-E-C-R-E-T] [TYPED: C-O-N-F-I-D-E-N-T-I-A-L]

From:                                   The Commanding Officer.
To:                                     The Commander in Chief, U.S. Fleet.
Via:                                    Official Channels.

Subject:                                U.S.S. CABRILLA (SS288) - Report of
                                        War Patrol Number Four.

Enclosure:                              (A) Subject Report.

                                        1.      Enclosure (A) covering the Fourth
War Patrol of this vessel conducted in Lombok
Strait, The Celebes Sea and Sibutu Passage during
the period 6 May to 9 June 1944 is forwarded
herewith.

                                                [SIGNATURE: W.C. Thompson]
                                                W.C. THOMPSON.

DECLASSIFIED-OAS. 0445, OPNAVINST 5510.1C
BY [HANDWRITTEN: JP-989C] DATE [HANDWRITTEN: 5/25/72]                                [STAMP: DECLASSIFIED]

8 0

— page 125 —
CONFIDENTIAL.
(A) PROLOGUE.

                                        Arrived Fremantle, W.A. 12 April 1944 from
                                        third War Patrol. Refit undertaken by U.S.S,
                                        PELIAS and Sub. Div. 121 Relief Crew and
                                        completed 26 April including conversion
                                        # 4 M.B.T. to Fuel Ballast Tank.

27 April to 5 May.
                                        Completed loading stores; sound tests; deep
                                        submergence; three days of day and night
                                        training and the firing of three torpedoes;
                                        magnetic signature taken.

(B) NARRATIVE (ALL TIMES HOUR).

6 May
    1300 Departed Fremantle for Patrol area via
         Exmouth Gulf in accordance with Com. Task
         Group Seventy One point one operation
         order 53-44 of 5 May 1944.
    1500-2300 Conducted surface and submerged approaches
         on target.
    2300 Set course for Exmouth via bombing
         restriction lane.

7-8 May
    1200 7 May Lat. 29-59S Long. 113-39E
    1200 8 May Lat. 24-50S Long. 112-33E

                                        Enrout Exmouth steering constant helm
                                        superimposed on zig plan during daylight.
                                        Conducted training dives and drills.
    0640, 8 May. Sighted merchantman bearing 340° T. on
                                        southerly course; avoided. (Not counted
                                        as ship contact).

9 May.
    1200 Lat. 22-10S Long. 114-08E
    0700 Entering Exmouth Gulf.
    0950 Moored alongside fuel barge. Fueling
         accomplished due to earnest and ingenious
         efforts of C.O. Navy 81, Lt. J.L. WOLLFORD,
         USNR and CABRILL, Chief Engineer Lt(jg).,
         A.M. FLOWERS, USN. During delay all hands
         thoroughly enjoyed a non-Navy Field Day of
         swimming, fishing, shooting, sunbathing and
         rest. Exploded myth that every hook wetted
         in Exmouth catches a fish.

-1-                                     8 02066

— page 126 —
NARRATIVE (CONTINUED).

9 May
1545 Underway for patrol station.

1736 Made several practice and two firing battle
     surfaces on ship aground at entrance. Excellent
     realistic training. Arrangements were made by
     Lt. WOLLFORD, USNR.

10 May
1200          Lat. 17-56S     Long. 114-49E

     Enroute patrol station zigzagging during daylight.
     Conducting training dives and drills. S.J. radar
     range unit out of commission due broken lead at
     crystal in delay tank (See comments under S.J.
     radar.)

1824 Reversed course for Exmouth to pick up new range
     unit for S.J. Increased speed to 75% load on 4
     Engs. to arrive at 1300, 11 May.

11 May
1200          Lat. 21-42S     Long. 114-15E

1354 anchored Exmouth. Skytrain delayed due inclement
     weather which also prevented our fueling.

1713 Underway for patrol station. S.J. range units
     exchanged. Adjusting speed to arrive station
     (Southern entrance Lombok Strait) dawn 14 May.

12-13 May.
1200 12 May Lat. 17-45S     Long. 114-43E
     13 May Lat. 12-20S     Long. 115-19E

     Enroute Lombok Strait. Conducting drills but only
     two dives daily due already one day late arriving
     station.
13 May #2 and #3 Mufflers and elbows eaten through and
     occasionally sparking.

14 May
1200          Lat. 08-53S     Long. 115-41E

0335 arrived on station 22 hours late. Apparently
     southern approaches completely clear of patrols.
     Rip tides very violent.

0528 Submerged midway between Lombok and Nusa Besar
     and north of Nusa Besar, expecting to be swept
     to southward.

                               -2-

— page 127 —
NARRATIVE (CONTINUED).

14 May
1835 Surfaced about 8 miles south of entrance having
been swept back by 5 kt. current. Depth control
was most difficult - gradients of 85° F. in
Strait to 68° at entrance. Sudden changes of
5° at periscope depth were not unusual. This
coupled with the turbulent waters and comp-
aratively green planesmen caused many very near
broaches and a low battery on surfacing.
Patrolling for remainder of night within 20,000
yds. radar range of both Nusa Besar and Lombok,
sound gear and ARC also manned.

15 May
1200 Lat. 08-51S Long. 115-42E

0529 Submerged midway between northern Nusa Besar
and Lombok Island.

0750 Investigated very loud and determined screw beat
150 RPM. Turned out to be porpoise but clearest,
most consistent and realistic we've ever heard.

1854 Surfaced. Depth control much better throughout
day although again swept almost out of strait.
Patrolling within 20,000 yds. Nusa Besar and
Lombok with sound gear and ARC manned.

16 May
1200 Lat. 08-44S Long. 115-42E

0532 Submerged well north of and on line midway
between Nusa Besar and Lombok.

1523 Battle problems conducted.

1710 Took picture of southwestern Lombok Island.

1859 Surfaced. On reaching finishing rate on battery
charge, entered straits for complete coverage
of whole strait selecting as midpoint a position
about 20,000 yds. from Bali, Nusa Besar and
Lombok, hereafter referred to as "Point Affirm".

17 May
1200 Lat. 08-36S Long. 115-40E

0550 Submerged 1 mile NW of Point Affirm.

0727 Sighted two masts bearing 293° T. range 10,000
yds. (Ship contact #1). Manned battle stations.

0838 Rigged for silent running as target appeared A/S
vessel but large enough for torpedoing. Target
course 105° T., speed 5kts.

-3-
8 02066

— page 128 —
NARRATIVE (CONTINUED).
17 May
0843 Took pictures as target definitely identified as
     Javanese auxiliary schooner with typical heavy
     bowsprit, two extremely tall masts, low island
     and low stack amidships, and lifeboat swung
     athwartships aft. However he was radio equipped,
     painted gray, manned with white uniformed sailors
     (two lookouts fwd, one each beam, one astern).
     A single 30 Cal. machine gun atop his super-
     structure was his only visible armament; no depth
     charges. Continued approach for practice but
     decided not to fire - estimated draft 5 feet,
     length 150 ft. at W.L., tonnage not exceeding 800.

0920 Secured from battle stations. Since diving we had
     maintained 53 ft. depth, keeping vertical antenna
     (SD radar mast) continuously exposed listening
     for contacts. This exposed about 14 ft. of
     periscope and at one stage of the approach I
     thought perhaps we had been sighted and the
     schooner sent after us. He passed on by but we
     secured the radio circuit and maintained 60 ft.
     depth patrol. Incidentally we heard nothing on
     radio circuits prior securing at 0730.

0951 Took several pictures of Bali.

1857 Surfaced. Pulled clear to south to charge batteries
     remaining within 20,000 yds. of Besar and Lombok.

18 May
1200          Lat. 08-36S Long. 115-48E

              Patrolling at point Affirm.

0435 Sighted patrol boat bearing 065° T. range about
     7,500 yds. in moon streak. (ship contact #2).
     We had good background so presented 180° angle
     on bow and watched him go by on approx course 110°
     T. He appeared to be SC of about 100 ft. He was
     never within radar range.

0531 Submerged 1 mile north of point Affirm. 14°
     negative gradient between 120 - 270 feet.

1421 Sighted small ship bearing 285° T range 7,200 yds.
     (ship contact #3) Manned battle stations.

1500 Took pictures. Target identified as typical, small,
     engines-aft half loaded sea truck of 6-700 tons
     painted gray but no armament visible. Decided he
     was not a torpedo target but he provided an
     excellent battle problem. Course 095° T., speed
     6.5 kts.

-4-

— page 129 —
NARRATIVE (CONTINUED).
18 May
1523 Secured from battle stations.
1851 Surfaced. Retired to south to charge batteries.
1945-2013 SJ out of commission.
2132 Strong SJ interference about 185° T.
2158 SJ Radar contact bearing 182° T., range 5,750
yds. Target northbound at about 17½ knots.
Assumed to be expected U.S. Sub. so pulled
clear at full speed to eastward and permitted
to pass. SJ interference and radar bearing
checked together as sub was tracked to
northward. (not counted as ship contact).

2300 Set course for Point Afirm.

19 May
1200 Lat. 08-30S Long. 115-49E
0530 Sighted patrol boat bearing 050° T. range about
7,000 yds on northwesterly course at about 5 kts.
(Ship contact #4). Submerged (1 mile north
point Afirm) to avoid detection. Closest range
was 4,500 yds. and visibility poor at this hour;
however he appeared to be small, 100 ft.,
converted A/S vessel, and definitely did not
have trim man-of-war PC type superstructure.
He is possibly not an A/S vessel.
1855 Surfaced eight miles, 040° T. from Point Afirm.
Patrolling toward Point Afirm.
2006 Avoided 3,200 yd. radar contact bearing 268° T.
at full speed. (Ship contact #5). Tracked on
course 120° T. speed 9 kts. Thought at first he
was chasing but soon decided that we just
happened to be in his path. Believe him to be
small inter-island auxiliary steamer (2 radar
pips). Retired to patrol southern entrance.

20 May.
1200 Lat. 08-36S Long. 115-46E
0100 Set course for Point Afirm.
0205 Avoided 2,000 yd. radar contact.
0530 Submerged ¼ mile south Point Afirm.

-5-
[STAMP: 8 02066]

— page 130 —
NARRATIVE (CONTINUED).
20 May
1220 Several scattered distant sailboats in sight.

1855 Surfaced 11 miles, 030° T. from Point Affirm. due
to strong northerly set. Continued steering 0230
T. at 15 kts charging batteries. I decided to
continue north through Lombok instead of Alas for
the following reasons: (1) Already in the northern
entrance with 1.200 gravity; (2) two busted and
occasionally sparking mufflers (Alas is 5 miles
wide at narrow point); (3) The complete absence
of all patrols therefore not endangering the
other two boats due for passage the same night;
(4) The timing from surfacing point to area was
perfect in that we could pass Cape William at
night thus enabling us to reach station in
shortest time on two engines instead of three
if Alas were used and no submerged days in Makassar
Strait.

Comments on Lombok Strait.
Apparently little heavy shipping uses this strait.
Frequent small ship passage occurs probably
between Laboean Amoean and Laboean Tring by
vessels doubling as A/S Patrols. None of these
vessels appear modern or fast and are not too
well armed. No planes were sighted either in or
approaching the strait. The Northern approaches
are possibly patrolled by sailboats ostensibly
fishing in the quite waters. There are no patrols,
sailboat or otherwise east or south of Nusa Besar.
Numerous beach lights were seen on Nusa Besar,
few on Bali and none on Lombok. There is apparently
a small garrison (about a dozen orderly tents or
huts) located 8°-28'S; 115°-38'E.
The currents and gradients make depth control and
station keeping difficult in spots in southern
entrance but north and east of Nusa Besar these
difficulties are negligible.

21 May
1200 Lat. 05-20S Long. 117-07E

0123 Sight and radar contact on Sekala Island bearing
330° T.; 15,000 yds.

0534-0611 Dawn trim dive.

0810-0844 Submerged on 4 mile SD radar contact (#1).

0856 Submerged on 12 mile SD contact (#2). This pip
was larger than the 0810 pip indicating, perhaps,
cargo being flown to Surabaya.

-6-

— page 131 —
21 May
1015 Surfaced.
1151 Sighted Sibaru Island.
1238-1415 Submerged. SD radar out of commission and
clouds patchy and low.
1630 Submerged on sighting closing plane (Contact
#3). SD did not verify contact.
1704 Surfaced. 3 Distant sailboats in sight.
2215 Avoided small sailboat, est. range 1,000 yds.

22 May
1200 Lat. 00-58S Long. 118-21E
Checking position with occasional soundings.
0524 Dawn trim dive.
0549 Sighted small boat with single mast (Sails, if
any, furled).
0613 Surfaced while boat was hidden in rainsquall.
0945 Sighted sailboat bearing 290°, 6 miles.
1037 Submerged. Commenced approach on "black
submarine". Turned into floating debris.
1129 Surfaced.
1132-1145 SD radar out of commission.
1300 Off Balik Papan, patrolling trade routes north.
1535 and at 1735 Investigated sailboats not
convenient to avoid. No Japs, 6 - 8 Malayans
in each; dingy and in poor condition, no
evidence contraband except small quantity of
rice each tried to give us. "Our Navy"
Malayan vocabulary entirely inadequate but
provided some good laughs and morale even
if no information.
2030 Slowed to 11 kts., manned sound gear.
2144 Closed Birahan Island, C/c for
Mangkalihat. Frequent rainsqualls and much
debris.

-7- 8 02066

— page 132 —
NARRATIVE (CONTINUED)
23 May
1200 Lat. 01-37N Long. 120-30E
0246 Avoided 1,800 yd. radar contact. Believed debris.
0518-0619 Dawn trim dive.
0637 Submerged on SD land contact.
0648 Surfaced. Entered area.
0715-0800 SD radar out of commission.
0822 Avoided sailboat.
1245 Decided patrol several days off Strooman Kaap
N - S on surface across traffic lanes.
1255-1402 Submerged on sight and SD plane contact (#4)
Betty Bomber.
1530-1630 Battle problem.
1652 Submerged on 6 mile SD contact (#5).
1741 SD contact (#6) at 5 miles when searching prior
to surfacing.
1830 Surfaced. Closing coast for nights patrol.

24 May
1200 Lat. 02-01 N Long. 121-01 E.
Patrolling N-S 5-10 mi off Strooman Kaap at 10 kts
0502 Opened to 20 miles off point for dawn trim dive.
Found 14° negative gradient at test depth.
0534 JP sound detected noise and periscope verified
two ships (ship contact # 6 & # 7) bearing 238°
T. range est. 20,000 yds. in twilight. Angle on
bow 30 port. Battle Stations. Commenced approach.
Sea wavy but glassy. Closing truck at 80 feet.
0547 Observation. Target zigged toward. Angle on Bow
zero.
0552 Sighted "Dave" type air screen (contact #7)
patrolling well ahead of target. Believed him
ineffective at this hour except for periscope
feather. All observations at 2 kts or less
except on firing.
-8-

— page 133 —
NARRATIVE CONTINUED.

24 May.
0555 Rigged for silent running.

0557 C/c to 200° T.

0600 Target zigged angle on bow 40 port. Range
     5,200 yds. Believed to be seaplane tender
     or old light cruiser. Escort is new looking
     DD (similar TERUTSUKI class except one gun
     fwd.). patrolling ahead of target crossing
     from bow to bow. DD presented 90° port angle
     on bow and crossed to stbd. bow of target
     out of range. Left fish set at 6 ft.
     however. Planned to fire 5 at target saving
     #6 set on 4 ft. for DD when he started
     for us.

0604 Flooded all tubes.

0608 Observation. Using 100 ft. Masthead height
     target checked by two plots and TDC on
     14 kts. Rigged for depth charge attack.
     Matched gyros fwd. Target had zigged
     angle on bow 70 P. Range 3900 yds.
     Bearing 187° T.

0610 Observation. Target zigged away course 064°
     T. Range 2200 yds., 90 port angle on bow.
     A/a std. C/c Lw 110° T.

0613 Observation. DD angle on bow 40° P and on
     far bow of target. Angle on bow target 115°
     P., range 2100 yds. bearing 117° T., speed
     14 kts. Fired six torpedoes, periscope
     spread, at target.

0614 Observing DD swinging our way; one torpedo
     jumping clear of water; large impulse
     bubbles breaking surface; and unable to
     locate plane, we went deep.

0615 Single explosion. Timed perfectly (2500yds) for
     torpedo hit and identical in tone and
     effect as torpedo war head. Sound did not
     hear targets screws after hit. Clearly
     heard before.

0618 Several simultaneous smaller or more
     distant explosions.

0620 Two explosions then two more. Then single
     explosion.

0621 Two explosions.

-9- 8 02066

— page 134 —
NARRATIVE (CONTINUED)
24 May
0626 Two explosions. Escort speeds up upon
      dropping his charges.
0627 Four single explosions.
0629 Explosion. DD stopped to listen.
0632 Explosion. Explosion.
0634 And at 0637 DD passed overhead; screws were
      heard through hull.
0638 Two explosions.
0643 DD Echo Ranging for first time, 17.4 KCS.
0647 Sound reports tremendous rush of air in general
      direction of target.
0658 Two explosions followed by six single ones
      during next two minutes.
0703 Explosion.
0704 Two single explosions 30 sec. apart. On
      almost all depth charges the familiar small
      detonation followed by large explosion and
      then the swishing and falling water were very
      evident. Many of the charges were close and
      large, jarring the boat considerably. No
      damage, however. DD apparently lost contact
      and never regained it, was out of depth
      charges (34 total), or proceeded with his
      ward for after several dummy runs his screws
      and pinging began to fade.
0730 All quite. Came up to test depth, pumped
      bilges, trimmed boat.
0800 Pinging more distant.
0820 Coming up to periscope depth quietly.
0840 Observation, all clear.
0914 SD depth - all clear when one dud depth bomb
      and one anything but hit close to the stern.
      (Plane contact #8). Minor damage only. Back
      to 200 ft. and expecting DD to return soon.
      Commenced reload and checking all fish.
0909 Making preparations to surface and chase.
      -10-

— page 135 —
NARRATIVE (CONTINUED)

24 May
1300 Surfaced all clear. Chasing belatedly down
     targets base course.

1400 Sighted "Dave" type plane (Contact #9)
     Continued chase but closely watching plane
     work up sun.

1410 Submerged when plane headed toward. Gave up
     all hope of further chase as SD was
     inoperative and clouds low and patchy.
     Also target even at reduced speed would
     probably reach Menado before we could
     intercept it.

1848 Surfaced. Continued patrol off Stroomen
     Kaap.

2143 Investigated 9,400 yd. radar contact but
     pip disappeared. If submarine, I am
     certain he couldn't see us. Believe it
     was minor lobe.

25 May.
1200 Lat. 01-59 N Long. 120-59 E.

0034 Avoided 3,400 yd. SJ contact, believed to
     be debris.

0509 Dawn trim dive. Raining.

0730 Sighted masts (ship contact #8) bearing
     061° T. range 18,000 yds. Angle on bow 0°
     Commenced approach.

0742 Observation. No air screen visible.
     Bearing 062° T. Range 12,000 yds. Target
     appears to be unescorted DD of same type as
     yesterdays escort. Probably returning
     Balik papan after delivering the plane
     tender.

0750 Target zigged away to course 210° T.
     Range 9,500 yds. C/c to 130° T. to
     close track. Target echo ranging.

0753 Range 8,400 yds., same course.

0758 Bearing 098° T. Range 5100 yds. Sound reports
     echo ranging ceased, target RPM's reduced.
     Target still tracking at 18 kts.however.

0800 Flooded 1, 2, 3, 4, 7, 8, 9, 10 tubes.

-11- 8 02066

— page 136 —
NARRATIVE CONTINUED.

26 May.
1457 Observation. Bearing 313° T., range 11,500
     yds. Using 90 ft mast head height.

1504 Observation. Bearing 317° T., range 8,800
     yds. Target zigging to course 122° T.
     Sighted masts of DD escort about 1,500 yds.
     on target's stbd quarter. Will have to fire
     ahead of escort, I guess. C/c 020° T.

1508 Observation. Good solution on TDC checked by
     Plot. Decided give target 4 torpedoes at 8 ft.
     and escort 2 at 4 ft. Closing track at std,
     speed.

1515 Bearing 326° T. Range 5,700 yds. Target
     zigged toward, angle on bow now 20° stbd.

1520 Flooded all tubes, Observation showed no change
     in set up. C/c to 000° T. for sharper track to shot
     on this leg. Rigged for silent running and depth
     charge attack. DD echo ranging.

1524 Fired four torpedoes at target using periscope
     spread, 104° S track 2100 yd range (actually
     1400 yds). First torpedo 16-22° right gyros
     was intended for MOT of escort but the bearing
     was not entered. Therefore 5th torpedo was
     aimed to hit AK. With DD bearing entered fired
     6th torpedo aimed ½ length ahead of DD.
     Observed two tremendous hits on AK, both aft
     (not fifth or sixth). Observed one torpedo definitely
     the water. At least one poppet did not
     function. With DD heading for slick, one
     possible erratic torpedo and boat rising from
     65 to 58 ft. Ordered deep submergence.

1525 Explosion. Explosion.

1526 Explosion. Explosion (light)

-14-
[UNCLEAR: ANCO R]

— page 137 —
NARRATIVE CONTINUED!
26 May
1527 DD com ing in echo ranging. Guess we missed
      him
1529 Four explosions.
1530 Six explosions.
1531 Five explosions.
1532 Two explosions.
1533 Target screws could not be heard. Loud ship
      breaking up noises could be heard plainly
      through the hull as well as on sound gear.
1535 DD circling.
1538 Explosion farther away (Target?)
1540 Five explosions closer.
1545 Blew 4000 lbs. out of negative (The first)
      DD resumed pinging.
1601 Could hear DD coming in for run through hull.
1603 Six very close depth charges overhead.
      shaking the boat violently, breaking glass,
      opening valves, etc. but no major damage.
      These were his last close charges and I
      believe he was either picking up survivors
      or had lost us. He continued echo ranging
      but stopped his screws occasionally.
1611 Large increase in noise level with occasional
      cracklings persisted in direction of target.
      Continued to hear pinging and screws until at
1730 Screws faded. Pinging more distant.
1741 Coming quietly to periscope depth.
1811 Observation in dusk. #1 periscope temporarily
      out (Cooked cable) All clear.
1816 At least two fairly distant explosions.
      Decided to surface and run for it.
1822 Two distant explosions.

-15-
8 02066

— page 138 —
NARRATIVE CONTINUED.

26 May
1823 Surfaced. All clear. Visibility poor. Clearing
     area to eastward to reload and check torpedoes
     and wait until moonset. Echo ranging still
     heard astern. Found many pieces of depth
     charges on main (fwd & aft) and on cigarette
     deck. Those last six charges must have been
     very close.

1940 Sighted DD bearing 060°T. out of radar range.
     Evaded.

2100 Echo Ranging no longer heard.

2130 Battery almost recharged and 3 torpedoes
     ready fwd and aft. Moon about to set. Headed
     in direction that pinging faded (and the
     spot of attack).

2300 Reached scene of attack. All clear. Still
     no pinging or evidence of DD. Conducted
     search of area to confirm sinking.

27 May
1200 Lat. 03-26 N Long. 122-47 E.

0055 Entered tremendous oil slick (4 miles across).
     Many 2000 yd radar contacts in an otherwise
     flat sea without contacts - believed
     wreckage. Was guided to spot by high noise
     level on sound gear. Oil fumes very strong.

0110 Abandoned search. Proceeding to Tawi Tawi area.

0458 Dawn trim dive.

0545 Surfaced.

0734 Investigated and recovered small abandoned
     native boat.

1352 Sighted "Dave" type plane(Contact #14)
     Submerged.

1452 Surfaced.

1533 Increased speed to arrive on station by midnight.

1825 C/c for Makassar Strait.to transmit message.

1845 Resumed course and speed.

2000 Made short trim dive to eliminate slick after
     greasing topside.

-16-

— page 139 —
NARRATIVE CONTINUED.

28 May
1200 Lat. 04-46 N Long. 119-38 E

0030 Arrived on new station, patrolling South
     entrance of Sibutu Pass.

0113 Avoided 2500 SJ contact, probably sailboat.

0421 Avoided 1200 yd SJ contact. Sighted
     sailboat.

0454 Submerged 10 mi. west of Manuk Manka Is.

0519 Sighted small sailboat bearing 348° T.
     Range 6000 yds on northerly course.

0610 Sighted "Davo" type plane (contact #15
     000° T., range 6 miles apparently
     patrolling entrance Tawi Tawi Bay.

0720 Sighted "Rufe" type plane (contact #16)
     bearing 355° T. entering Tawi Tawi Bay.

0806 Sighted masts of ship (contact #12)
     bearing 095° T. range 15000 yds.
     Commenced approach.

0825 Target identified as DD, Zigzagging or
     patrolling on southerly course at high
     speed. Echo ranging.

0847 Target disappeared bearing 191° T. Minimum
     range 12000 yds.

0928 Sighted small sailboat bearing 295° T.
     range 5000 yds. Sighted "Rufe" type
     plane (contact #16A) bearing 023° T.
     on SE course.

0950 Sighted 2 sailboats bearing 262° T. range
     3 miles on northerly course flying Jap
     merchant flags. Both closed to about 2000
     yds then tacked away again.

1900 Surfaced 10 mi. west of Manuk Manka Is.
     Retired in midchannel abeam southern end
     of Sibutu Is. to charge batteries and a
     await moonset.

2232 Sighted object believed to be ship
     bearing 318° T. Manned battle Stations.
     Commenced approach.

-17- 8 02066

— page 140 —
NARRATIVE CONTINUED.

28 May
2232 Waiting for moonset (2300) to attack. Object
     remaining on constant true bearing and on
     closing was identified as Sibutu hill Ahem!

29 May
1200 Lat.04-43 N Long. 119-41 E

     Patrolling at 11 knots 5-10 miles SW Manuk
     Manka Is.

0450 Submerged 7 miles west Manuk Manka Is.

0714 Sighted sailboat 292° T. range 5 miles.

0824 Sighted black smoke bearing 039° T. (In Tawi
     Tawi Bay) possibly on beach.

0850 Sighted "Rufe" type plane (Contact #17)
     range 8 miles on SW course.

0952 Sighted sailboat bearing 1500 yds on S. course.
     Passed well clear.

1917 Surfaced 7 mi. SW Manuk Manka Is. Occasional
     distant explosion heard throught day.

1930 Observed brief signalling between two stations
     in Tawi Tawi Bay or on Simunul Is.
     Patrolling 5-10 miles west Manuk Manka Is.

30 May
1200 Lat.04-39 N Long. 119-39 E

0030 Signalling from Bay area.

0123 Sound picked up light fast screws bearing 010°
     T. Turned away and stopped. SJ clear.

0140 Screws faded 000° T. resumed patrolling.

0445 Submerged 5 mi. SW Manuk Manka Is.

0734 Sighted unidentified plane bearing 035° T
     distance about 12 miles. (contact #18)

0740 Gasket on stop valve for after group #1 air
     bank blew out. Isolated fwd. group and
     increased pressure in all banks to 3300 lbs.
     in 2 but still had 6" pressure in boat.
     (See defects.)

0800 Black smoke bearing 036° T.

-18-

— page 141 —
NARRATIVE (CONTINUED)

30 May.
1007 Sighted "Rufe" type plane (Contact #19)
     bearing 233° T. range 1000 yds 500 ft.
     alt. zero angle on bow. Went to 200 ft.
     No bombs.

1050 Periscope depth.

1235 Sighted mast (ship contact #13) bearing
     348° T. Commenced approach. Battle Stations.

1241 Sighted tops six large warships angle on bow
     20° P. preceded by about five DD's with at least
     three DD's on each flank. One ship definately
     Fuso (sine curve foremast) Est. range 27000
     yds. No air screen obsevered but certain to be
     present. 80 ft. Seas flat but choppy. We
     were in edge of heavy rainsquall with a few
     whitecaps around us. Clear toward Task Force.

1247 Observation. Angle on bow 30° P. range about
     25500 yds. No change in setup. 80 ft. Closing
     at 2/3 speed. Rigged for silent running and
     depth charge. Screen about 5-6000 yds.
     ahead battle line.

1253 Observation. Formation zigging toward
     though all not on same course. Selected Fuso
     bearing 329, range 20000 yds. est. speed 20
     kts. zero angle on bow, as one target.
     Decided fire longitudinal time spread aft.
     and offset fwd. using TDC in order to fire
     from both ends at same time. Capital ships
     appeared in line of bearing 210° R. from
     guide assuming leading ship to be guide.
     Screen well ahead and echo ranging.
     Noticed several prongs sticking out at odd
     angles from large ships which I believe
     are aircraft radar. No bedsprings or FC radar
     noticeable. Unable distinguish turrets but
     leading ship believed to be Nagato class BB
     (large separate stack and built up foremast)
     second ship believed to be Kongo Class BB
     (large built up foremast and negligible
     other features.) Third Fuso. Fourth and
     fifth BB's or CA's and sixth probably BB or
     CA. Observation consumed about 45 seconds,
     probably a fatal error. Back to 80 ft.

-19-

[STAMP: 8 02066]

— page 142 —
NARRATIVE CONTINUED.

30 May
1258 Ordered 65 ft for observation but as we were
     passing 75 ft. coming up slowly several very
     violent and close depth bombs shook the ship.
     (Plane contact #20) They must have come from
     planes as DD should still be about 3-4000 yds
     away and sound did not detect screws that close
     Apparently one or more bombs were ahead and under
     us as we were bounced up to 45 ft. (according to
     3 depth guages) Much flying glass and missiles.
     A/a flank to get back down. A second series
     rocked us equally violently or more so as we
     passed 80 ft. Gave up periscope approach
     because of such efficient air coverage. DD's
     coming in fast and I believed both scopes
     probably wrecked. Went deep, headed for main
     formation at full speed hoping for sound shot
     and to evade DD's.

1303 Two explosions.

1304 Four explosions fairly close. One explosion.
     Slowed to 60 RPM due loud noise inside #1
     Main Motor. Still very noisy. Screws of BB's
     were just coming in on sound (8000 yards
     generated range) when attack occured. Battle
     line evidently turned sharply away because
     heavy screws faded shortly afterward. I
     believe the range was never less than 8000 yds.
     to nearest BB.

1308 Two explosions. Explosion. Three sets
     screws making runs on us, one occasionally
     stopping to listen. Many close dummy runs but
     apparently too much depth charging and screw
     noises for them to be certain.

1339 Single set screws only heard.

1345 Screws getting weaker bearing 160° T.

1400 Ordered periscope depth. Blew negative almost dry
     A/a 2/3. #1 motor noise excessive. Trim pump out of
     commission and do not desire to use drain pump.
     Levelled off at test depth working on trim pump.

1503 Sound reports very light screws bearing 318° T.,
     possibly PT boat. Also banging on board outside
     hull - (bow planes?).

1511 Same screws fairly loud bearing 300° T.

1522 Screws faded about 285° T.

-20-

— page 143 —
NARRATIVE (CONTINUED.)

30 May
1529 Echo ranging bearing 0000 T.

1550 Trim pump tempor arily repaired coming to
     periscope depth.

1623 Sound reports screws bearing 152° T. Almost
     8" pressure in boat and unable to pump it down.

1640 at 64 ft. unable see out of #2 periscope.
     Shifted to #1 and must have had 10 feet of
     scope out. However all clear. #1 Periscope
     blurred, out of focus, speckled in high power;
     no low power.

1705 Secured Battle Stations.

1835 Battle Stations for surfacing.

1854 SJ inoperative.

1858 Surfaced. Pressure in conning tower quickly bled
     off through hatch by closing lower hatch and
     ventilation. Starting main engines relieved
     pressure below as I did not want to take chance
     on blowing main induction gasket by venting
     through main induction. Retiring to SE charging
     batteries and searching for Jap fleet toward
     Davao at full speed on available engines. Sent
     contact report.

2129 SJ back in commission except for lobe switching
     motor in SJ antenna head.

31 May
1200 Lat. 04-08 N Long. 120-25 E.

0230 Doubled back toward Tawi Tawi Bay for 30 minutes
     then gave up chase as hopeless. Headed for
     Stroomen Kaap.

0500 Submerged about 60 miles SE of Tawi Tawi Bay to
     continue repairs and rest from 1 observed distant
     depth charging, 3 close depth chargings, and two
     closer bombings in last seven days. Observations
     with #1 periscope every 30 minutes. Sound
     continuously manned.

1628 Surfaced.

1728 Submerged on sighting "Betty" type bomber (Contact
     #21) zero angle on bow, bearing 205° T., range
     5 miles.

-21-
8 02066

— page 144 —
NARRATIVE (CONTINUED).

31 May
1831 Surfaced. SJ out of commission.
1932 Investigated possible red flashing light at
     full speed for 5 miles. No luck. SJ back in
     commission.
2200 #1 Main motor trouble is clearing itself.
     Probably brushes chipped or slightly shifted on
     bombing and are reseating themselves.

1 June.
1200 Lat.01-10 N Long. 120-12 E.
0345 Investigated possible red rocket (Star?) at
     full speed for five miles. No contact.
0450 Submerged 12 miles north of Dondo Pt. for days
     patrol.
0600 Sighted small power craft (Ship contact #14)
     bearing 145° T. range about 6000 yds. on
     easterly course. Unable to distinguish target
     through blur of periscope but believe him to
     be stack-aft sea truck. However decided against
     gun action as I could not make out his armament
     or even his type. Also SD out of commission and
     we are only 5 miles from land in a known well
     patrolled spot.
1858 Surfaced 8 miles N.W. Dondo Pt. Set course for
     North, then South Watcher, searching along coast.
1900 - 1948 SJ radar out of commission.
2140 Avoided 2000 yd sight and SJ contact.

2 June
1200 Lat. 01-22 S Long. 118-37 E.
0145 Odor of fuel oil in air but no traces on water.
0523 Submerged 100 miles E of Balikpapan.
1345 Surfaced in order pass Cape William in early
     evening.
1523 - 1600 Sighted and avoided sailboats.
1624 C/c to 350° T. to patrol approaches Balikpapan
     one more night.
2021 Sighted, investigated, then avoided small boat
     believed sailboat; possibly small patrol boat
     not echo ranging but no screws heard.

-22-

— page 145 —
NARRATIVE (CONTINUED).

2 June
2158 Sighted and avoided 2000 yd sailboat contact.
2210 C/c to 045° T.

3 June
1200 Lat. 00-54 S Long. 118-47 E.
0100 Patrolling N35-315° T. at 17 kts. reversing
     course each five miles.
0500 C/c to 125° T.
0555 C/c to 190° T. Headed for Cape William.
0800 Sighted unidentified plane range 6 miles
     in low clouds. Submerged. (Plane contact #22)
1004 Surfaced.
1437 Investigated small sailboat. and was joyously
     greeted by natives flashing a gallon can in
     which we had given them water a couple of
     weeks before. No evidence of hostile
     activities.
1600 Sank SE bound 20 ton, two masted schooner,
     (Ship contact #15) heavily loaded and in
     perfect condition, new sails. Used 4"
     after negligible damage by numerous hits with
     20mm. Sank immediately indicating a heavy
     load.
1955 Sighted and avoided sailboat.
2321 Passed SJ radar interference well to port
     believed expected friendly submarine.

4 June
1200 Lat.06-12 S Long. 116-44 E.
0530 Dawn trim dive.
0605 Surfaced.
0730 Sibaru Is. abeam to stbd.
0931 Sank large 100 T., two masted schooner
     ("DJALAN of "SOERJABAYA") (ship contact #16)
     with 4" gun assisted by 20mm. New sails
     freshly painted, lightly loaded and Japanese
     merchant flag furled.

-23-

8 02066

— page 146 —
NARRATIVE (CONTINUED.)

4 June
1530 Sekala Is. abeam to stbd.

1811 (After sunset) Sighted Navis type plane (Contact
     #23) on easterly course. Submerged. Brilliant
     moonlight, moon overhead.

2058 Attempting to enter Lombok St. 6 medium or large
     sailboats well spaced in arc at northern
     entrance. Closed Bali coast without success.
     Crossed Lombok coast and slipped presumably un-
     unobserved inshore around boats and into
     strait. Avoided four scattered objects.
     (Believed sailboats) inside strait all northeast
     of Nusa Basar.
2340 Cleared strait. Set course for Fremantle.

5 - 9 June.
1200 5 June Lat. 11-26 S Long. 114-45 E
1200 6 June Lat. 16-43 S Long. 113-04 E
1200 7 June Lat. 22-05 S Long. 112-48 E
1200 8 June Lat. 28-21 S Long. 112-49 E
Enroute Fremantle.

7 June 0820 Sighted PBY (Plane contact #24) on westerly
     course.

8 June 1806 Sighted two US Submarines, bearing 263° T.
     1435 Sighted PBY (Plane contact #25) on easterly course.

9 June
1100 Moored in Fremantle Harbor, W.A.

-24-

— page 147 —
(C) WEATHER.
Weather during this period was normal. Glassy seas
were found only in Northern Lombok Strait and three days
in Sibutu Passage. Otherwise a mild S.E. wind kept the
surface well ruffled.

(D) TIDAL INFORMATION.
Currents in Lombok Strait varied between a 2 knot
flood and a 5 knot ebb, slack water following the
change of tide by about two hours. During the period of
observation, the diurnal character of the tidal currents
gave way to a semidiurnal effect as the moon's
declination decreased, resulting in weaker ebbs and the
first appearance of any flood at all.
In the Celebes Sea the only currents observed were
1 knot westerly sets 5 miles N. of Stroemen Kaap and 20
miles S.E. of Tawi Tawi Bay.
In the southern portion of Sibutu Passage, the
current varied from 0 to 2 knots, setting W. and S.W.

(E) NAVIGATIONAL AIDS.
The lighthouse on Saluang Island (South of Sibutu
Island) was observed in its proper place but unlighted.

(F) SHIP CONTACTS All time HOW.
# | Time | LAT. | Type | Range | Course | How | Remarks.
  | Date | Long. |      | Yds. | Speed  |     |
--- | ----- | ----- | ---- | ----- | ------ | --- |
1 | 0727 | 08-34S | Aux. | 10,000 | 105 | P | 1.30 Cal.
  | 5/17/44 | 115-40E | Sch. |        | 5 kts. |   | Radio Equi.
  |       |       | 800 T. |        |        |   |
--- | ----- | ----- | ---- | ----- | ------ | --- |
2 | 0435 | 08-35S | SC | 7,500 | 160 | SN | In moon
  | 5/18/44 | 115-46E | Patrol |        | 5kts. |   | streak
  |       |       | Boat |        |        |   |
--- | ----- | ----- | ---- | ----- | ------ | --- |
3 | 1421 | 08-36S | Sea | 7,200 | 095 | P | Took
  | 5/18/44 | 115-46E | truck |        | 6½ kts |   | Pictures
  |       |       | Eng.ft. |        |        |   |
  |       |       | 650 T. |        |        |   |
--- | ----- | ----- | ---- | ----- | ------ | --- |
4 | 0530 | 08-35S | SC | 7,000 | 300 | SN | Converted
  | 5/19/44 | 115-48E | Patrol |        | 5 kts. |   | type
  |       |       | Boat |        |        |   |
--- | ----- | ----- | ---- | ----- | ------ | --- |
5 | 2053 | 08-39-S | Not | 4,300 | 120 | R | Small Pips;
  | 5/19/44 |       | sighted |        | 9 kts |   | Tracked.
  |       | 115-45E |       |        |        |   |
--- | ----- | ----- | ---- | ----- | ------ | --- |

-25-
8 02066

— page 148 —
(F) SHIP CONTACTS (CONTINUED)
# | Time | Lat. | Type | Range | Course | How | Remarks.
| Date | Long. | | Yds. | Speed | |

— page 149 —
(F) SHIP CONTACTS (CONTINUED)
NOTES.
(c) Lombok Strait has little or no shipping.
(d) North of Strooman Kaap, Celebes is a promising
    interception point.

(G) AIRCRAFT CONTACTS. All time HOW.
# Time Lat. Type Range Course How Remarks
  Date Long. (mi) Speed*

— page 152 —
(H) TORPEDO ATTACK

USS CABRILLA Torpedo Attack No. One. Patrol No. Fourth.
Time. 0613(H) Date 24 May 1944 Lat. 2-04N Long. 121-03E.

Description: Target was probably a seaplane tender
converted from an old light cruiser or the TAKASAKI (AS)
Est. 5-6000 tons. Pronounced clipper bow; one turret fwd;
medium height block bridge structure 1/4 to 1/5 distance
aft.; high stick mast with heavy crosstree aft of bridge;
cage type crane at base of mast swinging aft.; isolated
thin stack well forward. 2/3 Way aft was low squat stack
almost unnoticeable amid other gear; high stick mast
with heavy crosstree 3/4 way aft with cage type crane
swinging aft from base; cruiser stern. Probably 3 planes
on deck. General appearance - not new lines, bridge too
far fwd. and long expanse aft. Contacted by JP sound and
periscope simultaneously. An escort Terutsuki type except
slightly smaller and single gun fwd. Patrolled ahead from
targets stbd. to port bow. "Dave" type plane was air
screen. Visibility poor but increased rapidly with
daylight.

Ship(s) Sunk: None.
Ship(s) Damaged or Probably Sunk. One - Plane Tender.

Damage Determined by single tremendous Torpex war head
explosion 1 min. 53 sec. after firing first torpedo.
C.O. observed one of first few torpedoes leap clear of
water about 500 yds. short of target (did not premature)
and a certain hit if not erratic. Six torpedoes with
periscope spread should have given at least 2 hits.
Porpoising torpedo evidently #1 and erratic, #2 hitting.
Definitely did not sound like bomb and plane later bombed
us indicating he did not bomb us at this time. Target
screws not heard after hit although clearly heard 14,000
yds. before. DD continued searching for us for two hours
after attack. If target was undamaged, I believe DD
would have proceeded with target after several salvos
since they were making 14 knots and plane could have
kept us down.

Target draft Est. 15 ft. Course 053° T. Speed 14 knots.
Range at firing 2150 yds (2600 yd Torp run).

OWN SHIP DATA

Speed 2 kts. Course 110 to 085 T. Depth Periscope
Angle at firing. 0°.

Type Attack: Normal submarine day periscope attack.
Intended to fire 5 torpedoes (6 ft. depth) at target and
one Down Throat (4 ft. depth) at escort. However six
torpedoes were fired from bow tubes at target at range
of 2,700 yds. on 130 - 150 port track. Gyros were 348 to
357 degrees. Periscope spread was used and bearings were
put into TDC on each firing. Spread covered 150% of
target.

[HANDWRITTEN: 25080 H]
[HANDWRITTEN: -30-]

— page 153 —
(H) TORPEDO ATTACK. (#1 Continued)

Tubos fired - #1 | #2 | #3 | #4 | #5 | #6
Track angle - 133P | 140P | 146P | 149P | 150P | 152P
Gyro angle - 351 | 348 | 348 | 348 | 354 | 357
Depth set - 6' | 6' | 6' | 6' | 6' | 4'
Hit or Miss - Miss | Hit | Miss | Miss | Miss | Miss
Erratic - Broad- | No | No | Ne | No | No
(Yes or No) hed.
Mark Torp - 23 | 23 | 23 | 23 | 23 | 14-3A
Serial No. - 41140 | 41316 | 52943 | 41395 | 41387 | 40475
Mark Exp. - 6-4 | 6-4 | 6-4 | 6-4 | 6-4 | 6-5
Serial No. - 8318 | 8291 | 8303 | 8292 | 8293 | 14038
Actuation - Cont. | Cont. | Cont. | Cont. | Cont. | Cont.
Set.
Actuation | Cont. | | | | |
Actual
Mark Warhead- 16 | 16-1 | 16 | 16 | 16 | 16-1
Serial No. - 4068 | 5864 | 4851 | 4522 | 6560 | 12608
Explosive - TNT | TPX | TNT | TNT | TNT | TPX
Firing Int. - 0 sec. | 12 sec | 15 sec | 8 sec | 10 sec | 15 sec
Type Spread - Peris | Peris | Peris | Peris | Peris | Peris
Sea Cond. - Calm | Calm | Calm | Calm | Calm | Calm
Overhaul Act.- Pelias | Pelias | Pelias | Pelias | Pelias | Pelias

Remarks: One of the first torpedoes fired broached
completely clear of water 500 yds. from target. It
may have run erratic, but did not premature.

-31-
[STAMP: 8 02066]

— page 154 —
USS CABRILLA Torpedo Attack No. Two Patrol No. Four.
Time. 1524(H) Date. 26 May 1944 Lat. 2-48N Long 124-19E.

Description. San Yo Maru type escorted by Terutsuki type
DD (except smaller and single gun fwd.). DD maintaining
listening patrol with occasional echo ranging about 1,500
yds. on starboard qtr. of target. First sighted masts
through high periscope while on surface; gained position
ahead. Visibility excellent.

'Ship(s) Sunk SanYo Maru type, 8,600 gross tonnage.

Ship(s) Damaged or Probably Sunk. None.

Damage determined by: Four hits are believed to have been
obtained on the target. C.O. observed two hits - one
terrific hit between after mast and stern; one lesser hit
under after kingpost. Observed target listed heavily to
starboard and well down by the stern. Two other timed
hits checked fairly close with torpedo run. Loud ship
breaking up noises were heard throughout the boat as
well as on sound gear. Target screws were not heard
again after first hit.
Later that night when searching for target a four
mile oil slick with no outlet, a strong diesel smell,
many small SJ radar contacts (Debris) in an otherwise
clear sea, and a high noise level on sound gear were
encountered. DD did not give up search for at least 4½
hours after attack.

Target Draft. 28' Course 100° T. Speed 14 K Range 1375
(at firing)

OWN SHIP DATA.

Speed 2 K Course 354° T. Depth 65' Angle 0
(at firing)

Type Attack: Normal submerged day periscope attack. Five
torpedoes were fired at AK from bow tubes at range of 1350
yds. on 90 to 110 starboard track. Gyros were 16 to 22
degrees. Periscope spread was used (150% of target
covered) and timed were not put into TDC on each firing.
Only four torpedoes were intended to be fired at AK and
two at DD, but due to control error, five were fired at
AK which probably resulted in the fourth hit.
Evidently missed DD as his A/S measures were very
effective. Perhaps 3 torpedoes at DD and 3 at AK would
have been a better distribution but I was in perfect
position for AK and I did want a positive sinking.
One torpedo (probably #3) broached but did not leave
the water or premature.
Target had checked at 14 kts throughout, however poor ranges
(due #2 scope upper window not clearing quickly) prompted
a last min. reduction to 12 kts. This accounts for TDC range
being high (2100 yds instead of 1400) and for the observed
hits being aft.

-32-

— page 155 —
(H) TORPEDO ATTACK (#2 Continued)
Tubes fired - #1 #2 #3 #4 #5 #6
Track Angle - 104s 108s 86s 89s 91s 69s
Gyro Angle - . 16 19.5 18 20.5 22.5 01.5
Depth Set - 8 8 8 8 4 4
Hit or Miss - Hit Hit Miss Hit? Hit Miss
Erratic - No No Yes No No No
(Yes or No) Broach
ed
Mark Torp. - 23 23 23 14-34 23 23
Serial No. Q 41315 41303 41529 40069 41529 53168
Mark Exp. - 6-4 6-4 6-5 6-5 6-5 6-5
Serial No. - 11562 11553 14232 17259 711 17264
Actuation - Cont Cont Cont Cont Cont Cont
Set
Actuation - Cont Cont Cont? Cont
Actual
Mark Warhead - 16-1 16 16 16-1 16 16-1
Serial No. - 11624 1756 2790 11911 2774 3449
Explosive - TPX TPX TPX TPX TPX TPX
Firing Int. - 0 10 sec 10 sec 11 sec 13 sec 16 sec.
Type Spread - Peris Peris Peris Peris Peris Mot.
Sea Cond. - Calm Calm Calm Calm Calm Calm
Overhaul Act.- Pelias Pelias Pelias Pelias Pelias Pelias
Remarks: No. three torpedo porpoised and it may
have been directly responsible for the miss. Possibly
an erratic run.

-33-
8 02066

— page 156 —
(H) GUN ATTACK #1
USS CABRILLA Gun Attack No. One Patrol No. Four.
Time 1600(h) Date 3 June 1944 Lat. 01-33S Long. 118-39E.

TARGET DATA - DAMAGE INFLICTED.

SUNK: 1 Small 20 ton, 2 masted schooner
Damage determined by observation.
DETAILS OF ACTION.

Average range during firing was about 600 yds. One 4"50
Cal. gun, two 20mm, and one .50 cal. were used in this
action. One round of 4"50 cal. common and eleven rounds
of high capacity ammunition with point detonating fuses.
285 Rounds of 20mm, and 400 rounds of 50 cal. ammunition
were used. After failing to sink the target with machine
gun fire the 4"50 gun was manned. Pointing was only fair,
partially due to flooded trainers sight and cracked
pointers scope. Fire was local control. The sea was
glassy and visibility excellent. 67% Incendiary in the
20mm failed to set fire even to his sails.

(H) GUN ATTACK #2.
USS CABRILLA Gun Attack # Two Patrol No. Four.
Time 0930(H) Date 4 June 1944 Lat. 05-20S Long. 117-10E.

TARGET DATA - DAMAGE INFLICTED.

SUNK. 1 Large 100 ton, 2 masted schooner. Identified
as "DJALAN SOERJAYBAYA" by name painted on stern.
Damage determined by observation.

DETAILS OF ACTION.

The average range during this gun action was about 700
yds. The 4"50 cal. gun and two 20mms were used. Seventeen
rounds of 4"50 cal. high capacity ammunition with
detonating fuses and 240 rounds of 20mm were used. Gun
pointing showed marked improvement. Fire control was
local control. 20mm Fire was 67% incendiary, but damage
inflicted by this weapon, and failure to set fire to a
wooden vessel, was very disappointing in view of the many
hits obtained. The 4"50 Cal. H.C. point detonating fuse
is ideal ammunition for these wooden hull boats.

-34-

— page 157 —
(I) MINES.
No Remarks.

(J) A/S MEASURES AND EVASION TATICS.
I believe that the depth charges used against this
vessel were larger than 300 lbs. and on several occasions
were set for a 400 ft. depth. Once we surfaced with
many scattered pieces of depth charges on deck (fwd.,
aft. and on cigarette deck). This salvo exploded
directly overhead and very close while we were
somewhat below test depth. Vigilance of air screens is
improving, aided perhaps by the gray sloping periscope
shears on this type vessel.
Except for the effective bombing, the A/S
measures of the Task Force screen were hurried and
inefficient, but effective enough to thwart our
attack on this high speed group.

(K) MAJOR DEFECTS AND DAMAGE.

1. Nos. 2 and 3 Main Engine Mufflers and elbows
developed various size holes within one week after
start of patrol and the sparking and noise resulted in
a definite military handicap and even hazard due to
nature of this patrol. No 1 developed a hole in the
muffler about 2 weeks after start of patrol and close
inspection of No. 4 shows it to be in very poor
condition. All mufflers and elbows require renewal.

2. The SD radar was rendered useless for most of the
patrol due to a grounded antenna within the mast.
(See section M of Patrol Report for details.)

3. After 26.1 hours of operation the lead to the
sending crystal of the delay tank of the range unit
broke inside the lock nut securing the lead to the
crystal. Efforts to resolder the broken lead were
not successful. (For details see section M of Patrol
Report).

4. The following damage resulted either directly or
indirectly from depth charging:
(a) #2 Periscope top glass was shattered, however
only about 1 quart of water entered the periscope
during a six hour dive. This speaks well for the design.
Ablank was fitted in place of the top glass and the
periscope flushed with fresh water several times and
left filled.
(b) Number 1 periscope optics were so jarred that
the periscope cannot be used in low power and has a
double blurred view with many spots in high power.

-35-
8 02066

— page 158 —
(K) MAJOR DEFECTS AND DAMAGE (CONTINUED).

4 (c) Pointers gun sight was cracked and trainers
sight fogged or flooded. Protective covers were on
the telescopes at the time/

(d) Rubber gasket in H.P. air line at cut off valve
(installed at Pearl Harbor) from after group of number
1 bank blew while submerged, which built up 7" pressure.
The remaining 4 banks were pumped up to 3300 lbs.
leaving 6" pressure in the boat. All high pressure joints
should be checked after heavy depth charging. Perhaps
lead gaskets or patent gaskets (as hard as rubber (as
Nylon) in these high pressure fittings would be better.
Satisfactory repairs were made with a lead gasket.

(e) During submergence below test depth the rollers
on the locking down device of the QB sound head cracked
and broke off. The inability of the bearings to with-
stand the pressure at this depth caused the QB to be
entirely out of commission for depths below 100 feet for
the remainder of the patrol.

(f) After close bombing the SJ lobe switching motor was
inoperative. No attempt was made to repair the motor at
sea and the extent of damage is not known.

(g) Trim pump starting resistor (porcelain type)
was shattered, and overload adjustments on Portsmouth
type starting panel were disturbed in such a manner
as to prevent startingof trim pump. This panel should
be shock mounted.

(L) RADIO.

Radio reception was normal. There was no noticeable
jamming.
All serials were received.

(M) RADAR - SJ.

This vessel still has the old SJ radar. It functioned
very satisfactorily in general. On May 10th, the range step
started a sing out at 1200 yds. The lead to the sending
crystal (Western Electric No. D-150547) in the delay tank
range unit was found to be broken inside the lock nut
where it is connected to the crystal. Efforts to resolder
this lead were unsuccessful. This appears to this
command to be very poor design in that it is not
sufficiently rugged. Several other boats have experienced
similar troubles. No spare leads with crystals are
provided and this vessel had to steam 600 additional
miles to obtain a replacement unit and was delayed in
arriving on station because of this fragile and irreplace-
able unit. An approximate scale was pasted on the
screen and the SJ radar was again put in operation after
about one hour out of commission. Operation was normal
after the range tank was replaced.

-36-

— page 159 —
(M) RADAR - I. Continued.

After the close depth charging on 26 May the
sweep failed to come to proper position. Normal
operation was obtained on renewing the sweep
amplifier tube (6AG7).

Severe bombing on 30 May so damaged the lobe
switching motor that we have been unable to effect
repairs at sea.

There was no evidence of radar jamming.
Interference from other SJ radars was occasionally
observed.

RADAR - SD.

On May 22 arcing in the transmitter receiver
and diplexer was noted. This indicated a bad
mismate in antenna. Trouble was traced to a ground
in the port antenna inside the mast. It is believed
that vibration of the mast when making fast dives
caused insulators in the mast to break. To prevent
this, a mast-lowering switch has been installed at
the SD radar. Operation of the SD for the remainder
of the patrol was intermittent and completely
unreliable. The SD was continuously manned while
on the surface for the remainder of the patrol.
Although 24 plane contacts were made only 4 contacts
were obtained on the SD and none since 23 May 1944.
After the transit of Lombok Strait the SD was manned
for 5 seconds and land pips showed at 6, 6½, and
30 miles. The pips would die away and reappear
about once every 1½ seconds.

(N) SOUND.

The operation of the sound equipment was
satisfactory. The JK detected echo ranging at
approximately 20,000 yards. During the first depth
charge attack the bearing rollers on the locking
down studs of the QB sound head broke up when
below test depth. New rollers were made and
installed by ship's force but were not suitable
for operation of the QB below 100 feet.
The operation of the JP was very good. On one
occassion the JP detected a DD and AV at
approximately 15,000 yards. During depth charge
attacks the JP would often lose the escort when
it came in close and would pick it up later on
approximately the opposite bearing, indicating an
appreciable blind spot overhead.
During one counter attack by a DD the JK
got a zero beat on echo ranging at 17.4 KC. On no
other occassion was a zero beat obtained. Best
listening frequency varied between 18 and 21 KC
on different attacks.
No echo ranging was attempted.

-37- 8 02066

— page 160 —
(O) DENSITY LAYERS.
The following density layers were noted.

Date | Lat. | Limits of | °F drop per
GCT | Long. | Gradient | 100 ft. depth.

17 May | 08-35 S | 140 ft | 10.4°
2200 | 115-46 E | 270Plus |

23 May | 02-45 N | 160 | 6.9°
2100 | 121-00 E | 300 Plus |

24 May | 01-38 N | 140 | 5.7°
0000 | 120-58 E | 300 Plus |

26 May | 02-18 N | 120 | 7.5°
0400 | 123-55 E | 280 |

26 May | 02-49 N | 100 | 2.7°
0730 | 124-22 E | 300 Plus |

30 May | 04-40 N | 260 | 3.6°
0600 | 119-42 E | 300 Plus. |

(P) HEALTH, FOOD AND HABITABILITY.

Four sick days were lost due to a lacerated knee
sustained by a lookout falling through the after battery-
well hatch while wearing night adaptation glasses. Three
stitches were required. Our Firecontrolman received a
particularly bloody scalp wound when the blinker gun
flew off its designated stowage on the conning tower
bulkhead during the third depth-charging. Did not
qualify for a Purple Heart, however.
Food was of excellent quality and well prepared.
The state-side meat we had saved from the previous
patrol was greatly appreciated. Our irreplaceable
commissioning stock of canned tuna fish, shrimp,
crab, etc (carefully locked up prior departure of crew
on leave) disappeared during the last refit and was
missed by all hands, particularly for noon meals
on all day dives.
Habitability was in general excellent.

(Q) PERSONNEL.

Because of the shortness of this patrol we plan
to leave less than the usual quarter of the crew. Only
23% of the crew have made more than 3 consecutive patrols,
two of which have been short.

-38-

— page 161 —
(Q) PERSONNEL (CONTINUED)
Individual reactions to the frequent and close
depth chargings were excellent. More than 125 depth
charges and bombs, fully 2/3 of which were
dangerously close, were expended on this vessel
within 7 days; yet only two men showed any signs of
strain. It is a pleasure to command such a crew
(officers and men), and a boat known to be able to
"take it".

(R) MILES STEAMED - FUEL USED.
Fremantle to area - 2275 miles 25864 gallons
In area (Lombok) - 545 miles 3420 gallons
Lombok to Area - 893 miles 7715 gallons
In area - 1834 miles 15765 gallons
Area to Fremantle- 2460 miles 32885 gallons
Totals 8007 miles 85649 gallons

(S) DURATION.
Days enroute to Lombok - - - - - - - 7
Days enroute Celebes Sea.- - - - - - 2
Days on station 17
Days enroute Fremantle - - - - - - - 8
Days submerged 11

(T) FACTORS OF ENDURANCE REMAINING.
Torpedoes. Fuel. Prov. Personnel
No. Gal. Days. Days.
12 42,500 30 30

Limiting factor Damaged periscopes.

[STAMP: 8 02066]
-39-

— page 162 —
(U) REMARKS.

A few simple pertinent phrases in the Japanese
Malayan, Tagalog, Moro, etc. language would be very
helpful in establishing identity and questioning native
fishermen.

Chewing gum is an excellent substitute for smoking
during depth charging and many prefer it. I consider it
as vital to morale as cigarettes under conditions of
stress and can frequently be used when cigarettes cannot.
Contrary to traditional opinion, used gum has presented
no problem.

If a paint could be found that is light gray when
dry yet becomes very dark when in contact with salt
water, it would tremendously aid if not solve our
camouflage problem. The gray is good for surface work but
tell-tale submerged. In the proper hands perhaps a
solution or at least an improvement may be developed.

Many periodicals official and otherwise mention
the seasick pills. We tried unsuccessfully to obtain
some prior departure on the last patrol.
Our leading torpedoman, among others, is susceptible
to seasickness. Certain of our areas have flat waters,
but in some areas these pills might improve our
efficiency.

I note with pleasure the redesign of the vitamin
pills from basketball shape to football - much easier
to get down and "slicer" too.

-40-

— page 163 —
File: FC5-16/A16-3
Serial: 0334

CONFIDENTIAL

FIRST ENDORSEMENT to
CO CABRILLA Conf. Ltr.
SS288/A16-3 serial 8
dated 9 June 1944.

From :
To :
Via :

Subject:

(2/sh)

SUBMARINE SQUADRON SIXTEEN
U.S.S. RASHER, Flagship

15 June 1944

[HANDWRITTEN: See RS#
801137]

Commander Submarine Squadron SIXTEEN.
Commander-in-Chief, UNITED STATES FLEET.
Commander Submarines, SEVENTH FLEET.
Commander SEVENTH FLEET.

U.S.S. CABRILLA (SS-288) - Report of Fourth War Patrol -
Comment on.

1. The Fourth War Patrol of the U.S.S. CABRILLA was
characterized by very good area coverage. The patrol covered a period
of thirty-four days of which nineteen days were spent in enemy control-
led waters.

2. Two successful attacks were made on escorted enemy ships
and an attack on a task force was frustrated by enemy plane attack which
damaged both periscopes.

ATTACK NO. 1 - A day periscope attack on an AG with six torpedoes
with large track angles at 2700 yards range. Delay in firing resulted
in an unfavorable firing position and only one hit. There is a pos-
sibility that another torpedo ran erratic and missed for that reason.

ATTACK NO. 2 - A day periscope attack from a favorable position
with five torpedoes fired at an XCVB which gave two observed hits and
two timed hits. A sixth torpedo fired at a DD and aimed one-half
length ahead missed.

3. In connection with the approach on the Task Force on May
30th, it is noted that despite favorable weather and sea conditions for
periscope observations, the CABRILLA was bombed by aircraft at seventy-
five feet. The periscope or its wake may have been sighted on a forty-
five second periscope observation made five minutes before the bombing.
Nevertheless, with the present camouflage, the possibility of an air-
craft sighting a submarine running at eighty feet is great and the sub-
marine should run at sufficient depth between looks to minimize the
chance of such sighting. Maximum use must be made of sound information
in order to reduce the number of periscope observations.

4. The CABRILLA's material condition is good. All defi-
ciencies can be corrected in the normal refit time. The SJ-A will be
installed this time.

- 1 -

[STAMP: 8 02066]

— page 165 —
[HANDWRITTEN: 783]
[HANDWRITTEN: 12a/gr.]
FE24-71/A16-3 UNITED STATES NAVY
Serial: 0737 25 July 1944.
C-O-N-F-I-D-E-N-T-I-A-L [HANDWRITTEN: Ja RS #]
SECOND ENDORSEMENT to: [HANDWRITTEN: 8-01137]
USS.CABRILLA conf. ltr.
A16-3 Ser. 8 of 9 June
1944. Report of Fourth
War Patrol.

From: The Commander Submarines, SEVENTH FLEET.
To : The Commander in Chief, UNITED STATES FLEET.
Via : The Commander, SEVENTH FLEET.

Subject: U.S.S. CABRILLA (SS288) - Report of Fourth War
Patrol - Comment on.

1. The Fourth War Patrol of the CABRILLA was con-
ducted in the MAKASSAR-CELEBES SEA areas.

2. The Force Commander regrets that the damage from
aircraft bombing incurred while attacking an enemy Task Force
on 30 May, 1944, prevented the continuation of this successful
patrol. The aggressiveness displayed on the return trip through
MAKASSAR STRAIT was admirable.

3. This patrol is designated "successful" for the
award of the Submarine Combat Insignia.

4. The Force Commander congratulates the Commanding
Officer, Officers, and Crew on the successful completion of a
reconnaissance mission, and for inflicting the following damage
upon the enemy:

SUNK
1 - XCVS (SANYO MARU Class)(EC) 8,360 Tons(Attack No.2)
2 - MIS (SCHOONERS) 120 Tons (Gun Attack No.1
and 2)
TOTAL 8,480 Tons

DAMAGED
1 - (Obsolete Converted Cruiser)(EU) 5,500 Tons(Attack No.1)

GRAND TOTAL 13,980 Tons

[SIGNATURE: P.J. Straub Jr.]
P.F.STRAUB, JR. [SIGNATURE: R.W. Christie]
Flag Secretary. R. W. CHRISTIE.
DISTRIBUTION:
ComInCh (3) (Direct) CTF-71 ORIGINAL COPY (4)
Vice Opnav (2) (Direct) CTF-72 (2)
Vice Opnav Op-23e (1) CSS-12 (1)
ComlstFlt (1) CSS-16 (1)
Com2ndFlt (1) DivComs Ron-12 (1)
Com3rdFlt (1) DivComs Ron-16 (1)
Com7thFlt (2) S/M School N.L.Conn. (2)
ComSubs1stFlt (4) *Each S/M W.A. (1)
ComSubs2ndFlt (4) *NOT TO BE TAKEN TO SEA - BURN

8 02066

— page 166 —
UNITED STATES FLEET [STAMP: Reg. No. [HANDWRITTEN: 1077]]
COMMANDER SEVENTH FLEET [STAMP: S. No. [HANDWRITTEN: 8 02066]]

A16-3(F-3/roj)
Serial: [HANDWRITTEN: 02/44] 5 AUG1944

C-O-N-F-I-D-E-N-T-I-A-L

THIRD ENDORSEMENT to
U.S.S. CABRILLA conf.
ltr. A16-3 Ser. 8 of
9 June 1944. Report
of Fourth War Patrol.

From: Commander Seventh Fleet.
To : Commander in Chief, United States Fleet.

Subject: U.S.S. CABRILLA (SS288) - Report of Fourth
War Patrol.

1. Forwarded.

2. The Commanding Officer, Officers, and Men
of the U.S.S. CABRILLA are congratulated for conducting
a successful war patrol.

[SIGNATURE: H. W. Graf]
H. W. GRAF.
Chief of Staff.

Copy to:
ComSubs7th
ComSubRon-16
CO U.S.S. CABRILLA

— page 167 —
U.S.S. CABRILLA (SS288)
Care of Fleet Post Office,
San Francisco, California.

19 August 1944.

S3288/A16-3
Serial
[STAMP: DECLASSIFIED] I-A-L

From: The Commanding Officer.
To : The Commander in Chief, U.S. Fleet.
Via : Official Channels.

Subject: U.S.S. CABRILLA (SS288) - Report of
War Patrol Number Five.

Enclosure: Subject report.

1. Enclosure (A) covering the Fifth War
Patrol of this vessel conducted in the Sulu Sea
during the period 3 July to 19 August 1944 is for-
warded herewith.

[SIGNATURE: W.C. Thompson]
W.C. THOMPSON

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY [HANDWRITTEN: OP-09B2c] DATE [HANDWRITTEN: 5/25/72]
[STAMP: DECLASSIFIED]

10 01855

— page 168 —
CONFIDENTIAL

(A) PROLOGUE
     Arrived Fremantle, W.A. 9 June 1944 from
     Fourth War Patrol. Refit, including dock-
     ing was completed by U.S.S. ORION and Sub
     Div. 161 Relief Crew. On 23 June 1944, PPI
     and SJ-1 were installed.

     24 June to 2 July.
          Loaded stores; sound tests; deep submergence;
          three days of day and night training includ-
          ing convoy attack and the firing of three
          torpedoes; took magnetic signature. Degau-
          sed by Flash "D".
(B) NARRATIVE (All times HOW)

     3 July
     1300     Departed Fremantle for Patrol Area via On-
              slow, W.A. in accordance with ComTaskGroup
              Seventy One point One Opord 86-44 of 3 July
              1944.

     1500 to 2200
              Conducting training exercises.

     2315     Joined USS SANDLANCE and USS COD. Set course
              for Onslow via bombing restriction lane con-
              ducting training exercises enroute.

     4-5 July
              Enroute Onslow. Conducting drills and train-
              ing exercises in company with COD and SAND-
              LANCE. Constant helm superimposed on zig-
              plan during daylight.

     4 July
     1345     Sighted southbound U.S. Submarine bearing
              210°T, 16000 yards.

     1520     Exchanged recognition signals with PBY #23
              (Plane contact #1). Plane insisted on
              making bombing runs even after we exchanged
              signals, causing us to fire flares, wave and
              become perturbed.

     5 July
     1102     Exchanged calls with southbound USS NARWHAL
              bearing 235°T, 12000 yards.

     6 July
     0520     Sighted NW Cape and commenced piloting to
              Onslow.

     0630     Exchanged signals with KINGFISHER plane
              (Plane contact #2).

     1150     Moored port side to Onslow jetty and commen-
              ced fueling. Entry into harbor was simple.

-1-
10 01005

— page 169 —
6 July
but it is essential to moor securely dur-
ing slack water, preferably on the up
current side of the jetty for the fol-
lowing tide. Even after we were doubled
up and fueling several lines and a wire
cable parted due to current and choppy
seas. We finished fueling about 40 ft.
from jetty.

1600
Departed Onslow for area passing East of
Thevenard Island and between Airlie and
Rosily Islands, instead of doubling back
through Exmouth.

7-8 July
Conducting daily training dives and drills.
Constant helm on zig plan during daylight.

7 July
0409 and 1828
Exchanged calls with COD

8 July
1850
Exchanged calls with COD

2100
Radar interference 030°T and 110°T believed
JACK and COD respectively. Unable to com-
municate with either. Had to repack #1
periscope due to excessive leakage. (see
defects).

9 July
Constant helm superimposed on zig plan
during daylight.

0624-0653
Dawn trim dive.

1118-1151
Trim dive. Conducted drills.

1205
SD plane contact (#3) at 10 miles. Sub-
merged.

1329
Surfaced.

1340
SD plane contact (#4) at 6 miles. Sub-
merged. Had never before contacted Japs
this far south (70 miles) and was begin-
ning to doubt radar, skies cloudless and
plane not sighted on either contact when
heard heavy straffing.

-2-

— page 170 —
- -
9 July
1448 Surfaced.
1525 SD plane contact (#5) at 5 miles. Warmly wel-
comed by Japs with bombs at 1526, 1526½ and
1527, estimated range 200 yards, 150 feet
(straight up) and 200 yards. Believed SD
bombs apparently set shallow as much water was
heard falling back into sea.
1847 Surfaced. Proceeding Lombok Strait. SJ inter-
ference, believed to be COD.
2330 Entered strait.
10 July
0015 SJ contact (ship contact #1) and sighted small
patrol boat bearing 075°T, 9600 yards range on
converging course. Increased speed to 19 knots
and avoided to westward.
0034 SJ contact (ship contact #2) and sighted small
power boat bearing 330°T, range 8300 yards.
Avoided.
0200 Cleared Lombok. Set course for COD rendezvous
off Sekala. Had expected Japs to be practically
holding hands across strait after the aircraft
reception accorded us approaching the strait.
0455 Avoided small patrol boat (contact #3) bearing
085°T, range 6000 yards.
0600 Sighted Sekalu Island 002°T, range 12 miles.
0800 Received pilot line throwing gun from COD
for joint patrol of strait.
0844 Sighted RUFE type plane (contact #6) at about 8
miles. Submerged.
0912 Heard at least two distant bomb explosions (COD
the target?).
1005 Surfaced. Increased speed to 17 knots to pass
Cape William during darkness.
1109 Sighted COD on surface bearing 158°T.
1130 Sighted unidentified plane (contact #7), at about
6 miles. Submerged.

-3-
10 0135S

— page 171 —
10 July
1240 Surfaced.
1244 Sighted RUFE type plane (contact #8) at about 12
     miles headed toward. Submerged.
1357 Surfaced.
1400 Sighted RUFE type plane (contact #9) at about 8
     miles. Submerged. Have lost too much time to
     clear Cape William during darkness, even at 19
     knots. Cannot further surface running today
     without definite objective.
1845 Surfaced. Set course and speed for Cape Man-
     dur.
1850 Investigated false 18000 yards SJ contact.

11 July
0150 Radar contact bearing 008°T, range 12000 yards.
     Investigated at full speed. Pip was distinct
     and large but disappeared after a couple of
     seconds. Thorough search did not reveal tar-
     get, so cleared at full speed. Believed
     to be an atmospheric disturbance, but possibly
     low plane or submarine.
0225 Another instantaneous SJ pip at 24000 yards,
     bearing 175°T. Made a quick sweep with SD
     with negative results. Resumed course and
     speed.
0540-0630 Dawn trim dive.
0700 Sighted several small sailboats on SE course.
0757 With clouds becoming increasingly heavy, scat-
     tered and low, and in view of recent thorough
     A/S plane searches decided to submerge until
     more favorable conditions. Maintaining submer-
     ged patrol off Cape Mandur.
1843 Surfaced. Set course for Balikpapan-Mangkulih t
     traffic. Avoided numerous SJ contacts 1000-
     4500 yards identified as debris and small sail-
     boats off the Cape.

12 July
0540 Submerged 12 miles off Moeara Bajor on Balik-
     papan route for submerged patrol. Had intend-
     ed surface patrol to Mangkalihat but low, scat-
     tered clouds coupled with occasional rain
     squalls made surface running in this region
     inadvisable.

— page 172 —
12 July Surfaced. Set course and speed to clear Mang-
1847 kalihat by dawn. Avoided several 1000-4000 yard
SJ contacts.

13 July
0237 and 0300 Investigated 13000 yard SJ contact at full
speed. Nothing. Atmospheric?

0437 Mangkalih t abeam 15000 yards range.

0916 Sighted RUFE type plane (contact #10) at 7 miles.
Submerged. Clouds made surface running haz-rd-
ous but desire to make Sibutu tonight.

1047 Surfaced.

1119 Sighted RUFE type plane (contact #11) range 1-3
miles, elevation 15°, no indicator on SD. Plane
headed toward bridge was completely clear-
ed. Cannot understand why we were not blasted
out of water. Submerged patrol.

1613 Clouds somewhat cleared. Surfaced.

1614 SD contact (#12) range 20 miles closing rapidly.
Submerged.

1840 Surfaced. Proceeding to Sibutu.

2010 Definite pulsating (or rotating) contact
at 460 M.C.S. All clear on SD radar. Consider-
ed possibility Jap sub in area, especially in
view of A/C contact #11 not bombing us.

2017 Sharp SJ contact 1450 yards, avoided at flank
speed.

2100-2400 Avoided many close contacts, all unquestionably
debris. Hit submerged object slightly jarring
boat. Prop screws are O.K.

2223 Unidentified SJ interference.

14 July
0410 Closed Sibutu Strait for submerged patrol.

0505 Submerged 10000 yards west of Simunul Island on
sighting a probable small patrol boat. 10 [UNCLEAR: 0455]

0544 Sighted smoke. Commenced approach. Possibly
beach smoke.

0609 Smoke drawing left. Possibly convoy leaving
Tawi Tawi Bay. If south or Alice Channel bound
we are in good position for attack.

-5-

— page 173 —
14 July
0615 Sighted masts of two ships (ship contact #4) one
       obviousy a tanker and smoking heavily (coal
       burner probably) second ship is probably small
       AK; closing at standard speed, 120 feet between
       observations. Range approximately 20000 yards,
       angle on bow 60° port. True JP sound bearings
       steady.

0634 Observation. Practically no change. No air
       cover sighted. Sea Flat.

0648 Observation. Range closed slightly. Target
       zigzags. Suspect target on NE base course.

0656 Both sound heads out of commission electrically.

0715 Observation. Targets definitely headed for NE
       coast of Borneo. Kept up chase until 0738
       when final observation showed masts dis-
       appeared, but smoke still visible. Minimum
       range 15000 yards. Secured from battle stations.

0830 Sighted RUFE type plane (contact #13) patrol-
       ling over strait.

1010 Sighted two RUFE type planes (contact #14) circ-
       ling over Tawi Tawi. Except for two small
       patrol boats, the bay appeared empty. A radar,
       radio or lookout tower with crow's nest half-
       way to top appears to be located on NE low land
       of Bongao Island. Strong northerly current
       prevents patrol off entrance Tawi-Tawi Bay.

1720 Sighted small power launch rounding N.E. tip of
       Borneo headed apparently for the Bay.

1858 Surf cod. Proceeding west of Pearl Bank, Chas-
       ing and charging. Would be unable to catch 8
       knot target before entering Balabac; decided to
       search route from Sundakan toward Cuyo West
       Pass at full speed. Should arrive prior to
       noon tomorrow.

15 July
0438-0500 avoided 2000 yard SJ contacts.

0520 Manned SD radar.

0748 Sighted Black Rock Reef Light 304°T, 17 miles.

0800 Investigated possible semi-submerged 15" diam-
       eter wing pontoon floating vertically with about
       2½ foot above water and heavily encrusted with

-6-

— page 174 —
15 July
0800 sea growth below the water line. The below
water section may have been bulbous. A long-
itudinal crease dented the object from tip to
the water line. A 3"-4" handhole plate
was observed just below the waterline. Paint
on upper water section was yellowish gray and in
excellent condition. It was plainly stamped in
black stencil "40FSN". Position 8°-36'N;
119°-02'E. Sank it with Tommy gun. When hit
it had a definite metallic thud.

0932 Possible interference on SD.

1142 Sighted RUFE type plane (contact #15) 7 miles.
Submerged. Gave up chase.

1340 Surfaced. Patrolling E-W across traffic lanes.

1350 Sighted BETTY or LILLY Bomber (contact #16),
zero angle on bow, distant 6 miles. Submerged.

1633 Surfaced. Set course for Sindangan Bay.

1811 Sighted land and possible ship 091°T, 14 miles.
Opened to NW then as darkness fell, closed to
full speed. Land identified as Cagayan Sulu
group. Ship disappeared and was either land or
small patrol boat.

1952 SJ contact (ship contact #5) 050°T, 8500 yards.
Closed to 6000 yards. Tracked at 17 knots on
SW course.

2005 Target slowed to 10 knots. Believed to be pat-
rol. Avoided by cutting between Calusa Island
and Cagayan Island.

16 July
0021 Made trim dive after greasing ship. Merrily
flushing superstructure at full speed in middle
of Sulu Sea. When on surfacing at 0028 SJ
contact (ship contact #6) 2500 yards. Opened
range at full speed to 3500 yards to avoid.
Contact fired at least two rounds of tracer
(approximately) 40 MM shells in our direction.
Wide in deflection, close in range and probably
fired on sound bearing. Contact was never visi-
ble. Were we surprised! Tracked at 10 knots
180°T.

0135 Avoided 2000 yard SJ contacts. 10 0355

0235 Sighted and avoided SJ patrol boat contact,
6000 yards. (ship contact #7).

-7-

— page 175 —
16 July
0416 Avoided SJ contact (ship contact #8) at 7800
     yards. Tracked on course 240°T, 8 knots.

0458 Submerged, investigating Sindengan Bay. Clear
     of shipping, but possibly a small army camp on
     Palandok Point.

1235 Sighted masts (ship contact #9) Battle Stations.
     Commenced approach.

1250 Broke off approach as target is identified as a
     small patrol launch of about 60 tons. Evaded.
     Apparently armed only with 30 cal. M.G. Decid-
     ed against revealing presence by battle surface
     on first day in this area.

1321 Secured Battle Stations.

1540 Sighted smoke 037°T (ship or convoy contact #10).

1543 Echo ranging 037°T on 16.7 KCs. Commenced approach.

1600 Investigated gradient at test depth (-16°) Battle
     Stations.

1612 Observation. Smoke estimated 35000 yards, 040°T.

1623 Observation. Bearing 041°T, 20000 yards. Three
     distinct columns of smoke with tall masts at
     base of each, angle on bow 25S. One ZAKE air-
     craft screen (plane contact #17) was patrolling
     about 3-5 miles ahead of convoy. 100 feet be-
     tween observations. Sky overcast, sunset at
     1811, seas very flat but with slight ruffle. Two
     separate sources of echo ranging. Checking bear-
     ings on echo ranging between observations.

1647 JP hears screws at 050°T.

1650 Observation. 051°T, 10000 yards, angle on bow
     15S, however they must zig our way to pass Sin-
     dangan Point. Rigged for silent running and depth
     charge. Observed a large old type AK leading
     with a large new AK and large AO bearing about
     225° relative from leading AK. One DE was patrol-
     ling ahead of center of convoy, stopping occasion-
     ally to listen. One PC was patrolling about 2000
     yards from each beam to each beam of the convoy.
     Selected AO for bow tubes as most valuable target
     and second AK for stern tubes.

-8-

— page 176 —
16 July
1706 Observation. Bearing 054°T range 4400 yards,
c/c right for 60, starboard track on AO as we
were too close for 90 track.

1716 Observation did not sight tanker but we were
in excellent position for attack on a previous-
ly unseen loaded AP with cut down masts bearing
062°T, range 5500 yards, angle on bow 20°P.
c/c left to normal course. Large new AK just
ahead of and about 1000 yards to starboard of
AP.

1720 Bearing 048°T, range 3000 yards. No zig.

1725 Observed set up checking nicely. DE now about
300 yards on our port beam apparently lying to;
one PC about 1800 yards on starboard beam zero
angle on bow and pinging.

1729 PC shifted to short scale and speeded up. DE
still stopped.

1730 Fired 4 torpedoes checking tearing on 3rd tor-
pedo at AP, angle on bow 85 port, range 4400
yards, 30 right average gyro angles; fired 2
torpedoes at new AK, 100 port angle on bow,
range 2500 yards, 20° left average gyros. One
torpedo fired at AP was a heavy smoker and at
least two poppet valves did not function prop-
erly, decreasing our depth from 65 to 55 feet.
PC coming in fast, DE speeding up. Went deep.

1731 Heard and felt two torpedo explosions, 1 minute
8 seconds and 1 minute 15 seconds after firing
first torpedo.

1732 Received 11 depth charges 2-4 minutes after fir-
ing first torpedo, most of which were uncomfort-
ably close, severely shaking the boat, splitting
inboard flange on sea valve to trim manifold and
doing much minor damage.

1737 Five more depth charges not quite so close.

1740 Four more depth charges fairly close.

1743 Two depth charges, close.

1745 Two depth charges not so close.

1751 PC passed overhead but did not drop. At least
four sets of light, high speed screws were
heard searching, but only three were echo rang-
ing.

— page 177 —
16 July
1751 Screws stopping, hits on AK or breaking up
     noises, if occurring, were not observed due
     to prompt counter measures. All charges were
     heavy, deep and better placed than usual.

1805 All screws faded out; long scale echo ranging
     still heard bearing 038°T, gradually working
     around to 260°T.

1839 Pinging faded out.

1903 Pinging again heard bearing 220°T getting
     closer until at

1910 Surfaced, headed for scene of attack and chas-
     ing convoy down coast. At attack point strong
     fuel oil fumes, close radar contacts in an
     otherwise clear sea. OOD sighted two people
     swimming. Radar clear of large contacts
     afloat or beached.

2100 Radar contact (unit of ship contact #10) astern
     14000 yards. Tracked at 16 knots. Believe it
     to be DE rejoining convoy after searching for
     us until dark. Am not certain who is chasing
     whom.

2213 Range to DE now 19000 yards.

2237 SJ contact (unit of contact #10) bearing 259°T
     range 4950 yards. Apparently PC as rear guard
     of convoy. Passed well clear to seaward.

2246 SJ contact (contact #10) bearing 225°T range
     11000 yards. Not detected sooner because of
     land lobe interference on SJ. Coronado Point
     bearing 180°T, 4 miles. Commenced tracking.
     Convoy consists of 3 large ships roughly in
     column and four escorts. (Four ships were
     observed in afternoon attack). One escort was
     patrolling ahead to starboard bow; one on star-
     board beam to quarter; one about 4000 yards
     astern patrolling quarter to quarter and one
     inshore and abeam of rear ship. Believed we
     could not pass inshore undetected yet was very
     desirous of attacking before DE could join up.
     Made end around to seaward. Attack from sea-
     ward practically impossible due to escorts and
     convoy is hugging coast.

17 July
0055 Commenced approach from port bow, closed range

-10-

— page 178 —
17 July
0055 to 900 yards when convoy changed course to-
ward rounding Santa Maria Point. Pulled
into Sicken Bay (2 miles offshore) to wait,
gambling on getting out undetected after firing.

0118 With convoy now in 219° relative line of bear-
ing from leading .0, escort disposition unchang-
ed except DE now 6000 yards on starboard
of convoy, commenced approach again. TBT's were
flooded and bearing dials had slipped. Radar
ranges and bearings were used exclusively. Tar-
get speed 8 knots course 190°T.

0127 Hot shot in #7 tube increasing somewhat our
problem.

0128 With all targets and escorts plainly visible,
fired 4 bow torpedoes at .0, 85 port track,
range 3000 yards, 4° left gyro and 2 torpedoes
at middle ship, 76 port track, range 2700 yards,
3° right gyros. Swung ship, fired 3 torpedoes
at rear ship, 64 port track, range 2650 yards,
6° left gyros. Clearing cove at full power.

0130 Observed, heard and felt two tremendous hits in
.0 completely enveloping it and area around it
in 1000 foot flames, brilliantly illuminating
scene and us. Observed, heard and felt two hits
in middle K. It burst into smaller flames,
broke in two and sank within two minutes. Ob-
served, heard and felt tremendous hit in rear
target which stopped and appeared to be burning
internally, flames occasionally licking outside.
Meanwhile much signalling ("V3" or "V4" and
possibly "K") and gunfire were taking place.
No depth charges were dropped. The DE, leading
escort, and inshore escort apparently realized
where we were and started closing in. Thought
for a while we were trapped.

0144 Reloading tubes.

0155 Hot shot (Mk 18) in #9 tube while loading. (See
major defects) Propeller lock sheared off after
propeller.

0158 Fire in third ship was evidently getting out of
control as two large fires were plainly visible
from the bridge.

0200 The two PC's broke off chase and returned to
sinking ships. Avoiding of DE became easier as
we increased our distance from the burning ships

-11-

— page 179 —
17 July
0200 All hands except torpedoman aft witnessed with
     interesting display the bonfire.

0235 Successfully expended torpedo from #9 tube.
     Did not fire #7 tube because did not know con-
     dition of torpedo. TPX head had received se-
     vere blow against outer door springing it.
     Unable to unload #7 tube because of bent gyro
     spindle. Did not desire to change depth
     charging in this condition and as radar was
     positive only one ship had been left, the AO,
     and the flames from it had been clearly ob-
     served on the PPI screen, retired to seaward
     to investigate our condition.

0258 DE departed at 17 knots toward Zamboanga (out
     of depth charges, I'll bet).

0415 Burning ship glare still visible 35 miles
     astern and in breaking down.

0502 Submerged.

1853 Surfaced. Set course for point 10 miles south
     of night attack.

2000 Cut #7 gyro spindle, pulled torpedo into room,
     removed detonator. Inspected #7 outer door and
     found it to be slightly sprung unable to vent
     pressure off tube submerged.

18 July

     Avoiding numerous SJ contacts 650-4000 yards,
     probably debris and sailboats or small patrols
     tracked at 5-10 knots.

0330 Closed coast to 8000 yards (10 miles south of
     previous night attack) c/c to parallel coast,
     patrolling northward 6-8000 yards off coast.

0417 Passed through much debris and several oil
     drums.

0447 Indications of another radar on SJ, possibly
     another SJ though not clearly defined as such.

0503 Submerged. Port shaft squeals intermittently
     with metal to metal squeal.

1016 Sighted possible periscope bearing 260°T, 3000
     yards several times during next few minutes.
     Avoiding.

-12-

— page 180 —
18 July
1034. Sighted masts (ship contact #11) Battle Sta-
    tions commenced approach. Bearing 291°T 10000
    yards.
1058 Target identified as small coastal mine sweeper,
    probably patrol boat, painted gray and obvious-
    ly unarmed. Too small, 300 tons, for torpedo
    Do not wish to disclose presence as this fre-
    quently precedes convoy. Rigged for silent run-
    ning. Avoided.
1132 Secured from battle stations. Had kept after
    tubes ready for alloy shot had he picked us up.
1410 Sound detected echo ranging bearing 170°T.
    battle stations, commenced approach. Visibility
    1500 yards due to rain squalls.
1412 Sighted convoy (ship cont ct #12) through break
    in rain squall. Visibility rapidly changeable
    800-5000 yards. Rigged for silent running and
    depth charge on sightin PC through haze 2000
    yards 0° angle on bow. Flooded all tubes.
    Eveling at 63 feet.
1422 Unable to obtain any setup at all for tracking
    due to visibility. Sound indicates zig toward.
1426 Sighted PC escort dimly, then suddenly clearly
    at 700 yards on starboard quarter, 30° port angle
    on bow. Another PC escort appeared 2000 yards
    on port quarter, zero angle on bow. Sighted
    large, dim outline of two large AK's fairly clos
    e together. Whether to fire without decent solution
    or wait for night attack is the question. Tor-
    get speed estimated 9 knots. Can easily over-
    take up coast. Have four fish forward, three
    aft. #7 tube has sea pressure in it and two
    leaks occur around fittings in tube test
    depth. Visibility too good and variable for
    day attack. Convoy may be radar equipped,
    but I doubt it.
1427 PC's still closing, AK's not visible. decided I
    probably can do more damage on night attack than
    now. Went deep to evade and not arouse suspic-
    ions. Several close fast screws and pings from
    one alerted escort who hung around for forty
    minutes but no depth charges.
1528 Heavy screws faded bearing 048°T (up coast line)

-13-

— page 181 —
18 July
1535 All screws faded. Pinging fading. Coming to
periscope depth.

1609 Observation. All clear, visibility unlimited.
Secured battle stations. Pursuing submerged.
Convoy contains at least 2 large "K"'s, prob-
ably 3 third and at least 3 escorts. Fervent-
ly hope my decision will be proved correct.

1802 Two sailboats in sight.

1856 Surfaced. Chasing 8-10000 yards off coast at
full speed. Checking all bays for anchored
ships.

1926 Avoided 3700 yard SJ contact.

19 July
0018 Aligbay Island abeam to starboard, 6300 yards.
Radar in excellent condition - 60-70000 yard
land contacts.

0055 Slowed momentarily to listen on sound for echo
ranging. Do not believe convoy headed east as
we should now be in contact by sight, sound or
radar. Night is clear but dark. Continued
search between Negros and Sequijor Islands.
Convoy must have gone west of Negros.

0143 SJ contact bearing 203°T, 11000 yards. c/c to
200°T. Contact shortly disappeared. (Submar-
ine or, more probably atmospheric). c/c to
round Siaton Point and search west coast of
Negros.

0500 Reached northern limit of area. No convoy.
They evidently did not hug coast and probably
made a radical course change to N or NW after
dark, possibly at Coronado Point. I suppose
now I should wish I had attempted an attack,
but under similar circumstances I still feel
my decision was proper. Any firing would
have been a firing and probably wasted
torpedoes; whereas with even a little luck
a surface attack should heavily hurt the Japs.
Sending a contact report would be useless.
Submerged 8000 yards off west coast Negros on
probable route, working toward Siaton Point.

1901 Surfaced. Patrolling off Siaton Point and
thoroughly greasing our chattering (even in
hand) bow planes.

-14-

— page 182 —
19 July
2200 Set course for Coronado Point, beating bushes
     enroute.

20 July
0150 Possible SJ ship contact on shoreline in Sind-
     angan Bay. Wonder if it could be our damaged
     PT boat. Closed to 3000 yards but could not
     detect nothing unusual.

0450 Possible SJ contact bearing 075°T, 12000 yards,
     closing on normal course to investigate.

0507 Submerged 6000 yards off Coronado Point. Did
     not sight or hear contact so believe it was
     minor lobe from land.

1253 Sighted sailboat.

1351 Echo ranging on 195°T. Commenced approach.

1400 Found 10° negative gradient at test depth.
     Single vessel pinging and getting closer.

1442 Sighted mast of small patrol (PC) boat. (ship
     contact #13) bearing 165°T range 4500 yards.
     Seas covered with whitecaps. No targets or air
     cover with PC. Evading at periscope depth.

1453 Bearing 138°T, 3500 yards. Rigged for silent
     running although convinced he can detect us
     only by echo ranging in these seas. Too rough
     for torpedoes; anyway twice before a small boat
     has made "convoy to follow".

1515 Ringing on target faded on 110°T. Secured from
     battle stations.

1901 Surfaced. Patrolling off Coronado Point.

2230 Patrolling along coast toward Apo Island.

2330 Closed possible beached contact to 1500 yards
     but could distinguish nothing but beach.

21 July
0046 Sighted and avoided small boat. SJ performance
     rapidly deteriorating.

0205 Avoided 7000 yard SJ contact. (ship contact #14)
     Heard fast screws on sound. Thought he
     started chasing us once, but decided he was p-
     rolling north of Madulug Point. Investigated north of

-15-

— page 183 —
21 July
0205 point carefully but could distinguish no ships
    or likely radar pips. Contact not pinging.
0449 Submerged 10000 yards SW of Apo Island.
0740 Two distant sailboats in sight.
1520 Sighted RUFE (plane contact #18) bearing 030°T
    range 4 miles headed toward. Went to 150 feet
    for one hour as did not desire to risk being
    spotted.
1602 Distant heavy underwater explosion bearing
    110°T. Possibly plane bombing dark streaks.
1611 Second heavy explosion, slightly closer.
    Bearing about 120°T. Sounds like depth
    charges but no echo ranging.
1622 Third explosion, closer. Bearing about 140°T.
    Decided a convoy was using random depth charg-
    ing for protection. Nothing in sight.
1625 Fourth explosion. Observed masts of leading
    screen and masts of very large tender
    type, 2 n of war. (ship contact #15). Angle on
    bow 5° starboard. In position about 12000
    yards directly ahead of convoy. One perhaps
    two low flying RUFES for air cover. Battle
    stations, commenced approach at 100 feet. No
    screws or pinging on sound.
1639 Jussing 80 feet coming up for look. Much
    closer explosion. (possibly bomb)
1642 Observation. Targets had zigged radically
    away presenting 90 starboard angle on bow. Bear-
    ing 304°T, 7500 yards. Rigged for silent run-
    ning and depth charge. Sound detected screws.
    Attempting to close range for next zig.
1651 Heavy explosion.
1653 Observation. Target hopelessly by and hugging
    coast (about 1000-1500 yards off coast) at
    about 15 knots.
1659 Observation. Bearing 007°T range 7600 yards,
    angle on bow about 120° starboard. One RUFE
    plane ahead and one D.VE (plane contact #19)
    over convoy. One DD on starboard bow, one on
-16-

— page 184 —
21 Jul
1659
sterboard quarter and possibly one on port
quarter.

1701
Two heavy explosions, more distant. Gave up
chase. Target making too high speed to overtake
and night attack before reaching narrows
at Cebu. Believing the first few random depth charges
were SE of us, we had worked toward Apo Island.
When the sighting proved us wrong it was too
late to close. Minimum range was about 5500
yards; we have one low power torpedo; and with
existing seas and air cover I believe long
range shots would be avoided. It is now
impossible to determine infallibly the
direction of explosions when submerged.

1745
Secured battle stations.

1902
Surfaced. Set course for Coronado Point.

22 July
0145
Avoided 5900 yard SJ contact. Probably sailboat.

0337
Avoided 6800 yard SJ contact. (ship contact #16)
Sound identified as light fast screws, no echo
ranging.

0459
Submerged off Coronado Point.

0733
Sighted gray empty double ended, rudder aft,
CARVEL type lifeboat in perfect condition. Con-
tains two kapok life jackets, some well
saturated 21 thread manil line, 2'x2'x1'
net 1 box, four oars and one oar lock. A single
illegible Jap character was painted on bow.

1855
Surfaced. Patrolling W. Coast of Mindanao.

2228
Decided to shift patrol to shipping lanes west
of Negros Island, patrolling coast enroute, in-
creased speed to 15 knots.

2239
Avoided closing 3450 yard SJ contact to flank
speed.

23 July
0127
Increased speed to 17 knots.

0511
Submerged 30 miles west of Siaton Point on traf-
fic line.

1055
Visibility 2000 yards due to rain squall.

-17-

— page 185 —
23 July
1100 Surfaced. Patrolling hourly E-W logs at 13
knots.
1150 Submerged on 10 miles SD contact (plane con-
tact #20).
1155 Received one or two bombs near our diving point.
Visibility 1-2 miles at most. Seas heavy and
covered with whitecaps. Had been keying SD
continuously.
1300 All clear including the weather.
1844 Surfaced. Set course for West coast of Min-
danao to patrol 15-20000 yards off coast.

24 July
0512 Submerged due to visibility 31 miles west of
Balabac Point, Mindanao to patrol traffic
lane.
1850 Surfaced. Set course to patrol NW coast of
Mindanao. Avoided several 1500-3000 yard
SJ contacts.

25 July
0514 Submerged because of low, heavy, scattered
clouds and occasional rain squalls in same
point as yesterday.
0635 Sighted N.T.S. plane (plane contact #21) at 2
miles, headed toward, 1000 feet altitude.
Went to 150 feet. Visibility variable but
generally poor (15000 yards).
0700 All clear.
0938 Heard three heavy distant explosions. All
clear on periscope, visibility unlimited.
1327 Two distant explosions.
1328 Three distant explosions. Nothing in sight,
although visibility is about 15000 yards.
1346 Two distant explosions. Visibility closed
to 2000 yards. Made preparations to surface,
but before SJ was warned up visibility increa-
sed to about 15000 yards.
1400 Three distant explosions.
1415 Single distant explosion.

-18-

— page 186 —
25 July
1435 Single distant explosion.
1440 Single distant explosion. Kept SJ warmed up
     and prepared to surface upon decreasing visi-
     bility which did not again materially change
     from about 8 miles.
1844 Surfaced. Believed explosions were possibly
     northbound convoy off Mindanao coast. Closed
     coast at best speed and patrolled northward.
2100 Tracked single 10000 yard SJ contact (ship con-
     tact #17) on course 040°T at 11 knots, closed
     and sound identified as light, fast screws as
     continued chase of convoy.
2305 Avoided 4500 yard SJ contact.
26 July
0030 Slowed to 10 knots after investigating north
     of Apo Island. Gave up chase.
0455 Submerged 5 miles SW of Apo Island.
0746 Sighted small patrol XAM type of 300 tons. (ship
     contact #18) Avoided.
1042 Sighted trees in mirage of Silon Island and
     Mindanao. Gave up convoy, manned battle stations. Con-
     ducted problem to save face, then secured.
     Many native sailboats sighted throughout day.
1857 Surfaced. Proceeding to swap areas with BONE-
     FISH (same area North of 9°-30'N. plus eastern
     entrance Verde Island Passage and Tablas Strait).
2125-2200 Lying to while transmitting dispatch. Patrolling
     7-8 miles off coast toward Naso Point.
27 July
0504 Submerged 5 miles south of Naso Point.
1847 Surfaced. Patrolling toward Pulo Point enroute
     Verde Island to work passage before noon gets
     too full.
2105 Avoided 3500 yard SJ contact.
28 July
0250 Avoided 8000 yard SJ contact bearing 178°T (ship
     contact #19). Believed to be small patrol or
     island launch making 6 knots.

-19-

— page 187 —
28 July
0458 Submerged 5 miles west of Pucio Point.
1300 Sighted distant sailboat.
1851 Surfaced. Changed plans about Vorda Island
       set course to patrol southward through Cuyo
       West Pass and NE of North Islet for one day.
2302 Investigated did ringer for ship and small
       escort - 1 and 20 miles way in moon streak.

29 July
0628 Sighted masts and stack of southbound tanker
       (ship contact #26) bearing 059°T, range about
       25000 yards. c/c full to gain position ahead.
       Tracking.
0638 SD contact (plane contact #22 at 3 miles.
       Plane not sighted. Submerged expecting bombs;
       there were none. c/c to 140°T, attempting to
       close target at standard speed. Angle on bow
       very large.
0715 Battle stations. Weak echo ranging bearing
       090°T on 16.4 KCs.
0736 Slowed to 2/3 speed for observation. Choppy
       seas, many low and patchy clouds. Bearing
       104°T, range 17000 yards 80° starboard angle
       on bow. n/a standard. Investigated gradient
       at test depth (60° negative). Flange on air
       conditioning circulating water system had cor-
       roded (or electrolysis) through and sprung 1"
       leak. Leak stopped by closing sea valve but
       only after filling pump room bilges. Echo
       ranging slightly stronger.
0755 Observation. Bearing 124°T, 14000 yards 100°
       starboard angle on bow. Target is hull down
       but U-Bridge-K-M-F are similar to SINKOKU MARU
       10020 gross tons, except Kingposts are goal-
       post type. No escorts in sight, although sound
       has two separate sources of echo ranging. Hop-
       ing for radical zig toward. c/c to 160°T, n/a
       standard.
0810 Echo ranging faded.
0817 Observation. Target not in sight. Secured
       battle stations. c/c to 200°T. Plan to sur-
       face at 0900, trail until course and speed are
       standard.

-20-

— page 188 —
29 July solved, then one round if plane permits. Be-
lieve BONEFISH may be on tanker's route.

0930 Surfaced (delay due to inability to raise SD
mast). Chasing.

0945 SD contact 20 miles (plane contact #23). Faded
out.

1135 Sighted target 206°T, 24000 yds. Slowed.
Passing occasional half submerged oil drums.
Varying course and speed to keep target about
20000 yards ahead. Masts and top of bridge are
visible through high periscope. Periscope ob-
servations at 7-8 minute intervals to prevent
being sighted.

1344 Target zigged radically to eastward, range clos-
ed rapidly to about 20000 yards, but I do not
believe we were sighted. Target base course
195°T, making good 12 knots, large zigs about
5 minute intervals with an occasional one 90°
or greater zig (on possible sound contacts?)
Target speed about 14 knots.

1532 Since no further signs of plane, and with good
solution, decided and around to eastward.

1600 Target increasing range or visibility slightly
decreasing. Closing target again. News of
Hainan raid probably accounts for lack of
planes.

1610 BONEFISH surfaced 5000 yards on port bow. Slow-
ed to 14 knots and exchanged information. (Rad-
ical zig prevented his attack). Target then
passed on 198°T. Decided on joint search along
base course at 16 knots (actually 17 knots) with
15 mile interval for coordinated night attack.

2200 Gave up search, headed north at 11 knots. Tar-
get must have become suspicious, bent on 18
knots he is supposed to have and changed his
course in the decreasing visibility without our
realizing it. To lose this fat fellow was a
great disappointment to all hands after such a
prolonged chase with target in sight most of the
time.

30 July
0522-0700 Dawn, dive 15 miles SE South Islet.

-21-

— page 189 —
0700 Sighted large Manila fender.
1400 c/c for Naso Point.
2000 Patrolling between Naso and Sojoton Points at
     11 knots. Avoided several 1000-3000 yard SJ
     contacts.
2338 Sighted two small objects 040°T. Appeared to
     be two small patrol boats, c/c to give us a
     land background and silhouette then in set-
     ting moon. No echo ranging.

31 July Objects disappeared in rapidly reducing
0015 visibility and although we closed spot at
     full speed, completely lost objects. Since
     SJ (in perfect condition) never picked tar-
     gets up even though they were so plainly
     visible (estimated 8000 yards) I believe they
     were small patrol boats or more probably sail-
     boats. (not listed as ship contacts). Avoid-
     ed several 900-2000 yard SJ contacts.

0456 Submerged 5 miles south of Naso Point.
1911 Surfaced. Set course for Ducio Point patri-
     line 15000 yards off coast enroute Verde
     Island Passage.

1 August Avoided 3400 yard and 5000 yard SJ contacts.
0235
0451 Submerged 7 miles W. of Ducio Point.
0518 Sighted patrol or large silhout on souther-
     ly course close inshore Ducio Point.
1919 Surfaced. Set course for Verde Island Pass-
     age for only one day's patrol in this area
     due full moon in these restricted waters.

2 August Avoided several 1000-4000 yard SJ contacts.
0449 Sighted small patrol boat or power launch
     (ship contact #21), estimated range 7000 yards.
     Submerged 9 miles, bearing 110°T from Mala-
     briso Point, Luzon. Patrol boat was not seen
     after diving.
0850 Sighted masts of small ship (ship contact #22)
     on NE course bearing 359°T at about 8000 yards.
     Commenced approach.

-22-

— page 190 —
[UNCLEAR: 0910] Broke off approach. Target identified as small
stack aft XAM type patrol of 400 tons.

0927 Sighted small inter-island steamer (ship con-
tact #23) on Easterly course, (estimated 500
tons) bearing 316°T range 6000 yards. Apparent-
ly unarmed and heavily loaded.

1451 Sighted patrol boat (ship contact #24) bearing
278°T, 7000 yards.

1505 Patrol boat has bow like net tender or possibly
landing craft with draw bridge bow. Distinct
gray and very trim craft except for the high
bow. Estimated 1000 tons. Dubious torpedo
target, but at

1540 Sighted smoke and heard echo ranging bearing
316°T estimated 18000 yards, c/c to evade not
desired and commenced approach on smoke. Battle
stations.

1545 Observation. (ship contact #25) bearing 325°T,
about 17000 yards.

1550 Two sets echo ranging on sound.

1553 Sighted SALLY type plane (plane contact #21)
covering target. Target bearing 345°T. Top
of mast, bridge, stack and after gun visible
and very similar to AM-13. Single mast TC
type escort visible ahead of target.
Both target and escort are echo ranging apparent-
ly is only one escort is visible. Target c/c
to NE to pass north of Marinduque Island hugging
Luzon shore. Unable to close range within 10-
000 yards.

1601 Distant underwater explosion.

1606 Echo ranging fading.

1621 Observation. Bearing 017°T, 18000 yards, approx-
imately 130° starboard angle on bow.

1639 Target not in sight, but pinging bears 025°T.
Secured battle stations. Sighted many sailboats
during day and limiting observations for 1 hour
while he passed overhead.

-23-
10 01353

— page 191 —
brilliant moonlight. Trimmed
down to 100 feet. Patrolling toward
Pucio Point and I consider at least one hour
of darkness essential in this area.

2130(aprx) Two very distant underwater explosions.

2215 Sighted small patrol or power launch (ship
 contact #26) 135°T approximately 10000 yards.
 Avoided to west of Maestro de Campo Island.

2239 Sighted sailboat 226°T, 8000 yards. Closed
 Mindoro coast for land background. Avoided.

3 August
0454 Submerged 5 miles west of Pucio Point.

1907 Surfaced. Set course for Naso Point.

4 August
0026 Patrolling between Naso Point, Panay and So-
 joton Point, Negros.

0212 Investigated 24000 yard SJ contact. Rain
 squall. Avoided two 1500 yard SJ contacts,
 probably debris.

0502 Submerged 6 miles, bearing 304°T from Sojoton
 Point.

1912 Surfaced. Patrolling between Naso and So-
 joton Points.

2049 Sighted what appeared to be small AK and
 escort in brilliant moonlight bearing 196°T
 outside of radar range apparently bound for
 Iloilo. Continued working down moon to better
 identify targets.

2230 Targets definitely identified as sailboats
 and were never within SJ range. Before this
 contact had decided to patrol West Cuyo Pass
 for one day but do not now have time to make it.

5 August
0001 Investigated 5 objects off Sojoton Point, later
 identified as sailboats. Avoided.

0510 Submerged 6 miles NW Sojoton Point.

1900 Surfaced. Patrolling between Naso and So-
 joton points.

-24-

— page 192 —
August
2127 Set out for Truk, Trincom, Tulawan at 18
     knot.

6 August
0530 Formed to torpedo reported hitting submerged
     SD.

0529 Inaud SD radar.

0639 Submerged on 12 mile SD contact (plane contact
     #25). Proceeding submerged at 2/3 speed to
     reach station undetected.

1200 Patrolling 8-10000 yards SE Panastaran Point.

1914 Surfaced. Patrolling 15-25000 yards off coast.

7 August
0531 Submerged for 8-10000 yard patrol SE Panastaran
     Point.

1230 Check gradient at test depth (-12°F). Visibil-
     ity reduced due to rain.

1300 Hitting submerged objects previous evening
     evidently bent log arm. Attempting to house
     with chain full and straighten. No spares.

1323 Picked up screws and echo ranging on sound gear.
     Battle stations.

1324 Sighted large tanker and escort (snip contact
     #27) in haze bearing 323°T range about 8400
     yards, angle on bow 60° port, c/c to 280°T a/a
     standard to close track.

1327 Rigged for silent running, no depth charge
     attack. Sound conditions very poor.

1331 Observation. Bearing 299°T, range 5700 yards,
     angle on bow 85° port.

1338 Observation. Bearing 274°T, range 5400 yards,
     angle on the bow 110° port. Target is similar
     to KIYO MARU (possibly RIKKO MARU) in appearance
     but I believe larger 9-10000 tons. A MINEKAZE
     class DD is about 1000 yards on target's near
     quarter. Target's masts had been cut to about
     2/3 the listed height, and target was apparent-
     ly in extreme light draft. No air cover sight-
     ed and would be ineffective anyway. Sea choppy
     with a few small whitecaps, no swell; rain in-
     creasing. Flooded all tubes, set torpedo depth
     to 5 feet. c/c to 260°T.

-25-

— page 193 —
Observation. Target disappearing in a lo,
6600 yards continuing, sq.
Tracked on course 205°T,
speed 13.5 knots.

1349 Target has disappeared, screws fading out, no
chance for shot. Shifted to DD as target,
range 4300 yards. c/c to 240°T.

1356 Observation. DD bearing 237°T.

1401 DD has disappeared and screws no longer
heard. Echo ranging bearing 230°T, visibil-
ity about 5000 yards.

1409 Resumed normal operation all machinery.

1412 Secured battle stations. We were unable to
close target because of short approach. Re-
duced visibility and poor sound conditions
gave only 9000 yards warning. Angle on bow
was never less than 60°-70° port. Did not
fire at tanker at 5400 yards (though sorely
tempted) because: (1) short approach and poor
data made speed solution dubious; (2) only 4
torpedo spread practicable; (3) long range
shallow depth torpedoes probably would be
used for shot at DD (5) tonight (6) near maximum
range for torpedoes (7) and still in heart
of Jap territory.

1420 Visibility increased to about 15000 yards.
Nothing but land in sight. Plan to surface
and chase if visibility again decreases. Open-
ing out from coast at 2/3 speed.

1840 Surfaced. Chasing down Palawan Coast.

2255 SJ contact (same as #27) bearing 310°T, 17000
yards. Commenced tracking.

8 August
0000 Tanker is apparently anchored about 3000 yards
off Nariz Point and DD is patrolling about 3000
yards to seaward of tanker. Skies lightly over-
cast and weather threatening. However surface
visibility is excellent, sea glassy.

0015 Closing to better estimate situation.

0046 Range 14000 yards Noted increased activity of

-26-

— page 194 —
...open to 16000
believe surface
ent conditions and
board.

DD closing us rapidly with zero angle on bow.
Did not believe he had sighted us at 14000
yards, however increased to 14 knots, relative
bearing 165°.

0134    a/a full range to 9500 yards. DD closed
        rapidly to 8000 yards and opened fire with for-
        ward gun. a/a flank. c/s away.

0136    Radar reported interference not similar to an-
        other SJ. All clear on ARC and SD. Did not see
        radar on DD yesterday afternoon. DD c/c 90° to
        his right presumably to bring his after guns
        or tubes to bear. However, after a partial shot
        from forward gun he turned tail. Did not see
        any torpedo wakes or splashes. Slowed
        to bait DD away from shoals and to
        returned to his area. in resume patrol.

0348    SJ interference bearing 015°T. No definite
        pattern, possibly "noise".

0415    With dawn only an hour away and visibility still
        excellent, reluctantly gave up. There is no
        time for submerge attack before Balabac Strait
        and it is too far to reach that spot undetected
        in time. Set course for Sibutu.

0534    Submerged for rest. Observations every 15 min-
        utes.

1904    Surfaced and tuned SJ on Bancoran Island.

2145    SJ finally tuned. This delay will cause us to
        miss one day's patrol in Sibutu, however I do not
        want to enter strait with inefficient SJ.

[HANDWRITTEN: 9 August]
0048    Stopped while clearing departure dispatch.

0012    Proceeding Sibutu at 15 knots.

0524    Submerged due to poor visibility (15000 yards
        and low clouds).

1857    Surfaced. Visibility almost zero before moon-
        rise.

-27-

— page 195 —
9 August
2330 Completed uneventful passage of Sibutu in
     very bright moonlight.

10 August
0024 Rounded Saluag Island Light to search alice
     Channel. Channel clear.

0100 Visibility rapidly decreasing.

0532 Submerged 6 miles bearing 340°T from Sipadan
     Island to patrol about 3000 yards south of
     Borneo Reef to observe inshore route.

1905 Surfaced. Set course for Mangkalibat.

11 August
0531 Submerged to patrol off Mangkalibat Point.

0853 Sighted DAVE plane (plane contact #26) range
     6 miles.

1900 Surfaced. Patrolling Balikpapan traffic
     routes. Avoided several 3000 yard or less
     SJ contacts.

2100 Exchanged information with USS FLIER (ship
     contact #28). Detected his SJ interference
     while still about 28 miles away.

12 August
0530 Set course for Cape William.

0541 Submerged due to weather.

1027 Weather cleared. Surfaced.

1145-1152 SD out of commission.

1520 c/c 180°T off Cape William. Two sailboats
     about 8500 yards distance. Ignored.

1900 Cleared Cape Mardon. c/c to 214°T.

13 August
0353 Lina Island bearing 326°T, 25800 yards.

0550 Submerged.

0920 Surfaced. Submerged on 24 mile SD contact
     (plane contact #27) (OOD thought it was 4
     miles.

-28-

— page 196 —
13 August
1002 Surfaced.
1018 Submerged on 14 mile SD contact (plane contact
     #28)
1231 Surfaced.
1255 Sighted and passed 7 medium sailboats, 6000
     yards abean. Would have held field day if I
     didn't want to make Lombok tonight. May yet
     if they squall on us.
1402 Sighted MAVIS plane (plane contact #29) 15 miles
     submerged.
1505 Sighted DAVE plane (plane contact #30) circling,
     circling, range 5 miles. Searched frequencies
     on radio while passing sailboats but detected
     nothing unusual. The 1402 and 1505 contacts
     were different planes, so probably sailboats
     did not report us, however - - - - - -.
1735 Surfaced. Proceeding Lombok.
1944 Sekola abean to starboard, 8 miles.
2058 Exchanged information with REDFIN (ship contact
     #29)
2325 Avoided 5600 yard SJ contact.

14 August
     Entering Lombok Strait.
0103 SJ contact (ship contact #30) bearing 175°T,
     range 11000 yards. Tracked on course 060°T at
     7 knots and believed to be patrol boat or inter-
     island steamer.
0215 Cleared Lombok Strait. Set course for Fremantle
     via Safety lane.
0323 Contacted probable Lombok bound US sub at 7900
     yards on radar (ship contact #31) Strong SJ
     interference on same bearing.

1115-1125 Weak SJ interference bearing 080°T.

-29-

— page 197 —
15-19 August
          Enroute Fremantle, W.A. via safety lane.
          Constant hels on zig plan during daylight
          south of Exmouth. Conducting daily drills
          and dives.

16 August
0210-0515
          SJ interference 170°T increasing to 285°T.

18 August
0141
          Radar contact 070°T distance 17000 yards.
          Avoided.

19 August
0800
          Arrived Fremantle, W.A., conducted underway
          sound tests.
0835
          Moored Berth #4, North Wharf, Fremantle, W.A.

-30-

— page 198 —
The weather in the area was as predicted in sailing directions for this period of the year. The Sulu Sea was characteristically calm and smooth. Occasional rain squalls of short duration were experienced, accompanied by swells. Wind was light and variable. Average barometer reading was 29.82.

(D) TIDAL INFORMATION
During fueling operations at Onslow, W.A., an Ebb
tide of 4 to 6 knots was experienced. Several mooring
lines were parted and we finally fueled 40 feet off the
dock. In transitting Makassar Strait, a 1.1 knot souther-
ly set was experienced and a 4 knot southerly set in Lombok
Strait.

(E) NAVIGATIONAL AIDS
No navigational lights were burning, but all light-
houses encountered in patrol area were intact and properly
located.
No difficulty was experienced in approaching or de-
parting Onslow as the numerous islands with the help of the
radar made navigating quite easy.
While patrolling off the northern and western coast
of Mindanao the PPI, particularly the SJ-1, were invalu-
able, and made possible close navigation along the coast.

(F) SHIP CONTACTS
# | Time | Lat. | Type | Range | Course | How | Remarks
| | Long. | | Yards | Speed | |

— page 199 —
# Time   Lat.      Type                               Range   Course  How Remarks
  Date   Long.                               Yards   Speed

-
5 1952   09-36N    Patrol                             8500    230°T    P   Avoided
  15 Jul 121-07E  Boat                                        17 kts.

-
6 0028   08-57N    Patrol                             2500    180°T    R   He fired at
  16 Jul 121-48E  Boat                                        10 kts.  SN  least 2 rounds
                                                                           of tracer at us.
                                                                           Avoided
-
7 0235   08-31N    Patrol                             6000    -----    R   Avoided
  16 Jul 122-05E  Boat                                        -----    SN
-
8 0416   08-12N    Patrol                             7800    240°T    R   Avoided
  16 Jul 122-26E  Boat                                        8 kts.   SN
-
9 1235   08-14N    Small coal-                        10000   250°T    P   Too small
  16 Jul 122-41E  steel patrol                                10 kts.      50 tons.
                  launch
-
[HANDWRITTEN: 10] 1540   08-19N    2 AK's-AD                          35000   245°T    P   Attacked AP
  16 Jul 122-51E  AO-40's-1DE                                 11 kts.      Probably sunk
-
10a2100  08-14N    DE                                 14750   SW       R   Unit of convoy
  16 Jul 122-41E                                              16 kts.  SN  #10
-
10b2237  07-56N    Escort                             4950    SW       R   Unit of convoy
  16 Jul 122-05E                                              10 kts.  SN  #10 avoided.
-
10c2246  07-53N    2 AK's-1 AO-4                      11000   SW       R   11 units of
  16 Jul 122-03E  escorts                                     10 kts.  SN  convoy #10
                                                                           attacked.
-
11 1034   07-52N    XAM                                12000   020°T    P   Too small for
  18 Jul 122-07E  300 tons                                    5 kts.       torpedoes
-
[HANDWRITTEN: 12] 1412   07-55N    At least 3 AK's                    5000    035°T    P   Sound did not attack
  18 Jul 122-07E  3 escorts                                   9 kts.       due to
                                                                           visibility
-
13 1442   07-58N    TC                                 4500    NE       P   Echo ranging
  20 Jul 122-06E                                              -----        sound avoided
-
14 0205   08-25N    Small coal                         7000    NE       R   Avoided
  21 Jul 122-57E  steel patrol                                8 kts.   SN
                  or patrol
-
[HANDWRITTEN: 15] 1631   09-00N    1 Tender or                        12000   NE       P   Dropping random
  21 Jul 123-12E  3 escorts                                   17 kts.      depth charges
                  at least 1 DD                                            unable to chase
-32-

— page 201 —
# Time Lat.    Type        Range Course    How Remarks
  Date Long.               Yards Speed
27 2255 8-52N   AO and      17000 AO anchored R   Driven off
   7 Aug 118-00E DD escort         DD patrol- SN   by DD gunfire
                                   lin
28 2100 00-37N  US Sub.     7000  N         R   Exchanged calls
   11 Aug 118-47E                      SN
29 2058 07-12S  US Sub.     7000  N         R   Exchanged calls
   13 Aug 116-23E                    18 kts. SN
30 0103 08-30S  Small In-   11000 N         R   Avoided
   14 Aug 115-51E ter Island           SN
                  Patrol Boat
31 0343 08-56S  US Sub      7900  N         R   Unable to ex-
   14 Aug 115-43E                    18 kts. SN  change calls

-34-

— page 202 —
AIRCRAFT CONTACTS

Contact # | Date | U Time | B Position Lat. | S Lon. | R Min. | N Course | SD Motor search | Number | Type | Prob. I.D. | Missing | How sighted | Initial Range | View | Rng & Rel. Bear. | S/I | See (be up rt) | Visibility (miles) | Clouds (hei. ht)
---|---
1 | 4 Jul | 1500 | 28-55 | 112-45 | 17 K | Surf | 351 | 1 | Zero | NS | | By | 1.0 | L.C. | Unkn | 1 | 6 | 15M | 2000
2 | 6 Jul | 0630 | 21-40S | 114-15E | 17 K | Surf | 095-T | 1 | Hurrisher | NS | | IP | 0.0 | N.D. | N.D. | 1 | 3 | 10M | 3000
3 | 9 Jul | 1205 | 10-07S | 114-59E | 14 K | Surf | 020-T | 1 | Hurrisher | NS | | IP | 0.0 | N.D. | N.D. | 1 | 3 | 10M | 2000
4 | 8 Jul | 1340 | 10-04S | 115-00E | 10 K | Surf | 020-T | 1 | Hurrisher | NS | | IP | 0.0 | N.D. | N.D. | 1 | 3 | 10M | 2000
5 | 9 Jul | 1525 | 9-58S | 115-02E | 15 K | Surf | 345-T | 1 | Hurrisher | NS | | IP | 0.0 | N.D. | N.D. | 1 | 3 | 10M | 2000
6 | 10 Jul | 0844 | 6-43 | 110-26E | 17 K | Surf | 024-T | 1 | Hurrisher | NS | | IP | 0.0 | N.D. | N.D. | 1 | 2 | 0.5 | 2000
7 | 10 Jul | 1130 | 6-20S | 110-37E | 17 K | Surf | 024-T | 1 | Hurrisher | NS | | IP | 0.0 | N.D. | N.D. | 1 | 2 | 0.5 | 2000
8 | 10 Jul | 1215 | 6-15S | 110-37E | 14 K | Surf | 024-T | 1 | Hurrisher | NS | | IP | 0.0 | N.D. | N.D. | 1 | 2 | 0.5 | 2000

-35-

— page 203 —
11 MARCH 1944
| DATE | TIME | POSITION | COURSE | SPEED | RANGE | BEARING | TARGET | TYPE | SIZE (tons) | REMARKS

— page 204 —
Cont. at
Position I. t.
Speed
Course
Minutes since 1 st
Number
R.P.M.
P.C.I. in
D.R.I. in
A.A.C. & Rel. Re.
Visibility (miles)
Clouds (percent)
Sea (beauf rt)
| 16 Jul | 17 Jul | 18 Jul | 19 Jul | 20 Jul | 21 Jul | 22 Jul
| 1350 | 1623 | 1520 | 1658 | 1750 | 0635 | 0644
| 9-28N | 9-20N | 9-20N | 9-20N | 9-20N | 9-39N | 9-39N
| 119-43 | 120-31 | 121-30 | 122-11 | 123-11 | 122-21 | 120-23
| 000-T | 000-T | 000-T | 000-T | 000-T | 000-T | 000-T
| Surf. | Surf. | Surf. | Surf. | Surf. | Surf.

— page 205 —
Date                                23 Jul   24 Jul   25 Jul   26 Jul   27 Jul   28 Jul   29 Jul   30 Jul
Time                                0945     1553     0339     0853     0920     1015     1402     1505
Position L & T                      9-35N    13-32N   9-35N    01-10N   5-48S    6-05S    0-05S    6-10S
                                    120-22   121-23   119-03   119-12   116-51   116-45   116-45   116-45
Course                              14 K     17 K     17 K     10 K     10 K     14 K     14 K     14 K
Speed                               Surf:    Surf:    Surf:    Surf:    Surf:    Surf:    Surf:    Surf:
Wind                                200 T    270 T    150 T    204 T    204 T    185 T    185 T    185 T
Clouds (percent illu.)              1        040 m    Zero     2 hrs.   Zero     Zero     Zero     6c in.
Visibility (

— page 206 —
(H) Torpedo tt ok 1. Patrol 5, Time: 1729(H), Date 10
July 1944, Lat. 08°-19'N Long. 122°-50'E.
T. 1500 DWT. - D. 1000 DWT.

Description:

Convoy consisted of 1 P, 1 O, 2 AK, 1 DE, 4
PC or small escorts. Large ships were roughly in line
of bearing, about 210° relative from leading ship. Convoy
was making course; the P patrolled ahead with one
PC on each bow of convoy. All other PCs were patrolling
to seaward.

P - Similar to KASUGA MARU - P. 29 ONI 208J-M; raked
bow; stern not observed; 3 decks each neatly lined with
troops in whites (extr. lookouts?) dressed in khaki, and
smaller units of sailors in whites; superstructure was
about 1/3 total length with stack in the center; space
between superstructure and ends was about 1/2 length of ship
and was cut down to top of stub mast leaving a
double section that formerly stepped. The KASUGA MARU
is listed as a coal burner, however our target was not
observed to smoke.

One AK not positively identified, 1 large, MFL; general
appearance of being very long and an old type; smoked heav-
ily. Not too tall and about 1/4 length inside to the
stern; composite midships superstructure; fairly tall;
straight stack; believed plumb bow and counter stern; hull
painted black or very dark color.

The O not positively identified as it was seen only
with sharp angle on bow and later during darkness and
while making a reverse run. It was (8500-10000 T); paint-
ed a lighter grey; definitely no coal casts forward of bridge
and, if any at all, they were about the same height as
or lower than the bridge structure; two tall sticks, masts;
at least 1/3 freeboard although apparently fairly full
bridge structure about 1/3 way aft; a very
heavy smoker.

One P not positively identified; general appearance
of Liberty ship; 1 large, trim and painted grey; raked
bow; cruiser stern; composite midships superstructure
tall masts; number and arrangement of king posts
not observed; slightly lopped forward.

SHIPS SUNK: None described above.

SHIPS DAMAGED or PROBABLY UNK: None

-39-

— page 207 —
D.M.GE DETERMINED BY:

Two timed torpex hits, 1 min. 8 sec. and 1 min. 15
sec. after firing first torpedo. Check closely with
torpedo run for #3 and #4 torpedoes. Night data indica-
ted speed used in this attack was about 2 knots high.
Screws were not heard after hits were made. When re-
turning to scene of attack after surfacing, oil fumes
were very strong and oil was observed on the water;
many close SJ radar contacts were observed on PPI screen
in an otherwise clear bay; two swimmers were observed by
OOD; carefully searched area for cripple or beached vessel
without contact; on regaining contact with convoy only
three large ships were present.

TARGET D.T.
Draft 25 feet Course 265T Speed 9 knots Range 1420 yds.
                                        (used 11 knots)

OWN SHIP D.T.
Speed 3 knots Course 345T Depth 65 feet Angle 0

FIRE CONTROL AND TARGET DATA.
This was a daylight submerged periscope attack, the
convoy being tracked in by periscope bearings from an
estimated range of 35000 yards. Due to a radical zig
over the entire stretch the set up was shifted to the
trailing IP, which could be closed to a good attack
position. The B sound gear was used to provide contin-
uous checks on target bearing, and the JK sound gear was
used to check on the positions of the escorts. The rel-
atively short initial range (5500 yards), and two very
close escorts prevented more deliberate periscope expos-
ures and therefore the target speed estimate was probably
2 knots in error. Final periscope bearing was obtained
immediately before firing; and another after second tor-
pedo. Shifted setup to new AK, increased range 1000
yards (an estimate) and fired remaining two forward torpedoes.
Torpedoes were spread 20 by TDC offsets to give a linear
spread of 50 yards along the target track.

-40-

— page 208 —
ATTACK #1
| | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Tube Fired | 1 | 2 | 3 | 4 |
| Zone Time | 1729-30 | 1729-38 | 1729-46 | 1729-54 |
| Range | 1450 | 1430 | 1410 | 1400 |
| Torpedo run | 1380 | 1370 | 1360 | 1340 |
| Target Bearing | 027° | 025° | 024° | 022° |
| (rel.) | | | | |
| Truck angle | 94°p | 95°p | 97°p | 98°p |
| Gyro angle | 006° | 001° | 004° | 004° |
| Depth Set | 6 ft. | 6 ft. | 6 ft. | 6 ft. |
| Power | High | High | High | High |
| Hit or Miss | Miss | Miss | Hit | Hit |
| Erratic | - | - | - | - |
| Mk. Torpedo | 14-3. | 23 | 14-3. | 14-3. |
| Serial # | 40015 | 49539 | 40584 | 40017 |
| Mk. Exploder | 6-5 | 6-5 | 6-5 | 6-5 |
| Serial # | 17116 | 24985 | 17120 | 17119 |
| Actuation Set | Contact | Contact | Contact | Contact |
| Actuation Actual | - | - | Contact | Contact |
| Mk. War Head | 16-1 | 16-1 | 16-1 | 16-1 |
| Serial # | 3212 | 12680 | 11769 | 3678 |
| Explosive | TPX | TPX | TPX | TPX |
| Type Spread | 1°L | 3°L | 1°R | 3°R |
| Sea Conditions | Calm | Calm | Calm | Calm |
| Overhaul activity | U. S. S. O R I O N |
| Miss due to | Spread | Spread | - | - |

-41-

— page 209 —
.TT.CK #1

Tube Fired 5 6
Zone Time 1730-05 1730-13
R.nge 2400 2460
Torpedo Run 2610 2680
Target Bearing 003° 002°
(rel.)
Track Angle 118°P 120°P
Gyro Angle 341° 340°
Depth Set 6 ft. 6 ft.
Power High High
Hit or Miss Miss Miss
Erratic - - - - - -
Mk. Torpedo 14-3. 14-3.
Serial # 24188 26329
Mk. Exploder 6-5 6-5
Serial # 17108 17100
Actuation Set Contact Contact
Actuation Actual - - - - - -
Mk. Warhead 16-1 16-0
Serial # 3312 4720
Explosive TPX TNT
Type Spread 0° 2°L
Sea Conditions Calm Calm
Overhaul Activity U.S.S. ORION
Miss due to Spread Spread

-42-

— page 210 —
Torpedo attack #2, Patrol #5, Time:0128(H), Date 17
July 1944, Lat. 70-40'N Long. 122-03'E.

TARGET D.T. - - DAMAGE INFLICTED

Description: Same as for attack #1, less one ship.

SHIPS SUNK: One AO; one AK

SHIPS DAMAGED or PROBABLY SUNK: One AK.

DAMAGE DETERMINED BY:

(a) Observed 1 AK break in two and sink within
two minutes.
(b) Observed two tremendous hits on AO which im-
mediately burst into 1000 foot flames from stem to
stern and was visible 3 hours later at 35 mile range.
Salvage considered impossible.
(c) Observed tremendous midships torpex hit on
second AK. Internal fires were immediately started and
increased to external within a few minutes. Radar in-
dicated only one ship contact at 8000 yards and that
clearly in flames on the screen where formerly there had
been three.

TARGET D.T.

Torpedoes #
1-2-3-4 AO Draft 25 ft. Est. Course 190°T Speed 8.5 Kts. Range 3000 yds.
5-6 AK Draft 18 ft. Est. Course 190°T Speed 8.5 Kts. Range 2700 yds
8-9-10 AK Draft 25 ft. Est. Course 190°T Speed 8.5 Kts. Range 2650 yds.

OWN SHIP D.T.

Torpedoes #
1-2-3-4-5-6 Spread 15 Course 290°T On Surface
8 Spread 10 Course 140°T On Surface
9 Spread 10 Course 135°T On Surface
10 Spread 9 Course 130°T On Surface

FIRE CONTROL AND TORPEDO D.T.

This was a night surface radar attack. In the early
stages of the attack the PPI was used almost exclusively
in determining the convoy and escort formations. Track-
ing by radar ranges and bearings set in the TDC was con-

-43-

— page 211 —
ducted well outside visual range. In the attack phase,
the radar was not used for sweeping; continuous radar
ranges and bearings were set in the TDC and as our TBT's
were completely flooded out; radar lobe switching be-
came too bad while firing. No difficulty was encount-
ered shifting targets. Except for the 1st 3 torpedoes
1° spread angles from TDC offsets were used for linear
spread of 60 yards along the targets track. The last
three torpedoes were offset 2° for 120 yard spread along
the targets track. The spread used for the after tubes
was excessive in view of excellent speed data; however,
a large spread was deliberate in that radar bearings
were used as firing bearings.

-44-

— page 212 —
.TT.CK #2

Tubes Fired           1         2         3         4         5
Zone Time           0128-50   0128-58   0129-06   0129-14   0129-25
Range               3150      3065      2990      2910      2750
Torpedo Run         3000      2910      2860      2790      2470
Target Bearing      006°      005°      005°      004½°     013½°
     (rel.)
Track Angle         84°P      85°P      85°P      86°P      76°P
Gyro Angle          356½°     354½°     355½°     356½°     005°
Depth Set           6 ft.     6 ft.     6 ft.     6 ft.     6 ft.
Power               -
Hit or Miss         Hit       Miss      Hit       Miss      Hit
Erratic             -
Mk. Torpedo         23        23        23        23        23
Serial #            49544     49301     49407     53260     43142
Mk. Exploder        6-5       6-5       6-5       6-5       6-5
Serial #            14415     17273     19421     14449     14318
Actuation Set       Contact   Contact   Contact   Contact   Contact
Actuation Actual    Contact   - - -     Contact   - - -     Contact
Mk. War Head        16-1      16-1      16-1      16-1      16-1
Serial #            13589     13710     13722     13735     13698
Explosive           TPX       TPX       TPX       TPX       TPX
Type Spread         0°        1½°L      0°        1½°R      0°
Sea Conditions      Flat C lm Flat C lm Flat C lm Flat C lm Flat C lm
Overhaul Activity   U. S. S. ORION
Miss due to         - - -     Spread    - - -     Spread    - - -

-45-

— page 213 —
ATTACK #2

| | 7 | 8 | 9 | 10 |
|---|---|---|---|---|
| Tube Fired | 7 | 8 | 9 | 10 |
| Zone Time | 0129-33 | 0131-41 | 0131-49 | 0131-57 |
| Range | 2665 | 2645 | 2665 | 2680 |
| Torpedo Run | 2500 | 2320 | 2350 | 2370 |
| Target Bearing | 013° | 177° | 181° | 185° |
| (rel.) | | | | |
| Track Angle | 76° | 63° | 64° | 64° |
| Gyro Angle | 002° | 168° | 171° | 179° |
| Depth Set | 6 ft. | 6 ft. | 6 ft. | 6 ft. |
| Power | --- | --- | --- | --- |
| Hit or Miss | Hit | Hit | Miss | Miss |
| Erratic | --- | --- | --- | --- |
| Mk. Torpedo | 23 | 23 | 23 | 23 |
| Serial # | 49468 | 53191 | 49639 | 49318 |
| Mk. Exploder | 6-5 | 6-5 | 6-5 | 6-5 |
| Serial # | 14425 | 14433 | 14453 | 17277 |
| Actuation Set | Contact | Contact | Contact | Contact |
| Actuation Actual | Contact | --- | --- | --- |
| Mk. War Head | 16-1 | 16-1 | 16-1 | 16-1 |
| Serial # | 13683 | 13726 | 13713 | 13738 |
| Explosive | TX | TX | TX | TX |
| Type Spread | 1°L | 0° | 2°L | 2°R |
| Sea Conditions | Flat Calm | Flat Calm | | |
| Overhaul Activity | U.S.S. ORION | | | |
| Miss due to | --- | --- | Spread | Spread |

Remarks: - #7 not fired due to hot run in tube. For
           details see section K - Major Defects.

-46-

— page 214 —
(I) MINES
No evidence of mine or mine sweeping was observed.

(J) ANTI SUBMARINE MEASURE AND EVASION TACTICS

Enroute to and in radar coverage was greater and
more persistent than on previous patrols in the same areas.
One unseen 10 mile SD contact off Sistan Point came in rap-
idly and bombed our approximate diving point in heavy rain
squall, heavy seas and very poor visibility. He must have
come in on SD beam or used radar. However after the H.L.
maker. raids only two planes were observed north
of Cape William and one of those was covering a convoy in
Verde Island Passage.

The convoy on 21 July dropped random depth charges to
"frighten off" subs, I suppose. Aside from slightly in-
creased tension of an attack, I believe they
are not very effective and may indicate the Japs think
(and I wish they were right) have acoustic torpedoes.
They effectively reveal the presence of a convoy.

Depth charges, rather heavy and deep, and have been drop-
ped between firing point and target in such an attack on our
last two patrols - which is where C.BRILL. was but deeper
and more bow shots.

No positive indications of DFing the SD or of radar
equipped escorts were observed.

One escort in the convoys off the Mindinao Coast used
an unusual type of pinging; however he seemed to be no more
effective than his single pinging mates.
Evasion consisted of running silent and deep to 60-80
feet and deeping escorts stern.

(K) MAJOR DEFECTS

1 (a) When making the tubes ready for firing in the nigh
ttack of 17 July, the torpedo ran hot in #7 tube. This had
run damaged the muzzle door so that it could not be complete-
ly closed by power or hand, and bent the gyro spindle which
was engaged. The run occurred while water was being blown
with 20 pounds pressure from W.R.T., and when the tube was
nearly full. Impulse air was not admitted to the tube. It
is believed that the ignition of the torpedo occurred while the
water was being blown to the tube, and that this moved the
torpedo past the stop bolt far enough for the starting
lever to contact the tripping latch. The force exerted by
the propellors on the water in the tube was evidently enough
to force the torpedo under the stop bolt, and in the 2 foot
end clearance of the after tubes, the torpedo did have suf-
ficient momentum to strike the outer door and spring it fro
m it's seat. Further evidence of a faulty stop bolt was seen
when the torpedo was withdrawn with no difficulty from be-
yond the stop bolt.

-47-

— page 215 —
The torpedoes and tubes had been routined 2 hours
before as the tubes had been flooded while at periscope
depth during the afternoon attack. In this routine, in-
board slugs were fired and it is believed that the stop
bolt did not drop fully in place, although the stop bolt
rod returned to bolting far enough for the gyro spindle,
and interlocks to engage.
The gyro spindle had to be cut flush with the tube
surface as it was bent too far to be withdrawn normally.
The torpedo guide stud showed no evidence of severe
blows against the stop bolt. The shutter bar was in place,
and the "ready to fire" lever down, therefore the stop bolt
could not have lifted had the tube been fired accidently.

1 (b) A second hot run, this in tube #9, occurred on a
Mark 18 electric torpedo, as the reload was being made
after the night firing. The torpedo was being loaded,
and before the torpedo was against the stop bolt. The safety stick had been remov-
ed, and the propellor lock was still on.
It is believed that when the wooden safety block
was removed, the starting lever was very slightly moved,
either forward or aft. This partially rotated the starting
lever stop valve which allowed high pressure
air to leak slowly past the starting piston. When the
piston had built up to 1600#, the starting switch was
closed and the torpedo ran hot. The movement of the
torpedo while loading promptly actuated this leakage.
Since the after shaft is probably bent, and the pro-
pellor lock and the forward propellor continues to race,
the value of this type propellor lock is questionable.
To eliminate any possible movement of the starting
lever while either inserting or removing the safety
blocks, the wooden wedges used on Mark 18's should be
replaced by safety sticks similar to those for Mark 14's.
Cutting down the forward shoulder on the starting lever
cam would eliminate the possibility of hot shots by
forward movement of the starting lever.

2. Packing on #1 periscope began to leak excessively
on the first deep dive leaving Fremantle. The packing
was inspected and found to lack about 1" of butting.
This can be attributed only to carelessness. Ship's
force repacked the gland completely.

3. Bendix log sword arm was bent by submerged object.
Sword arm was pulled through hull with aid of one ton
chain hoist. Ships force straightened arm with hydraul-
ic jack and re-installed. The Bendix Log on this ship
is unreliable and requires far too much upkeep.

-48-

— page 216 —
4. Early in the patrol the Bow Planes began to chatter
(this sound is if packing might be binding or excessive),
which necessitated stopping and sending men down on the
plunger to grease tilting packing gland every four or five
days. This would not be practicable in rough sea. There-
fore, if possible, greasing connections should extend to
superstructure.

5. Both TBT's were flooded within three days after our
departure. The periscope TBT's were installed on our last
refit. TBT's were dried out several times but promptly re-
flooded.

6. The bridge-conning tower control talk-back system
installed on the last refit is a vast improvement over our
previous system, but lacks volume on the bridge. We are
hopeful of a solution on this refit.

7. SJ-1 motor generator is unsatisfactory (see R.D.R.
section).

8. During the latter part of patrol the cradle balancing
spring on one 20" torpedo broke. No spares are allowed and none
were on board. It is recommended that one spare be carried.
These springs have not been renewed since commissioning 24
May 1943.

(1) RADIO

Considerable enemy jamming was noticed on the 4000 and
9000 KC bands. Usually jamming was ineffective as VIXO
could be copied by slightly detuning receiver. One station
coming on at 2000 every day was particularly effec-
tive when we were in the northern part of our patrol area.
Signal strength was as strong and stronger than VIXO and
was completely covered the 9000 VIXO broadcast band.
Signal strength of new VIXO 16150 KC frequency varied from
strength 4 during daylight hours to strength 0 during dark-
ness. A great deal of time was spent on the surf and sur-
face radar during this frequency. After using on August 9,
tube 6C8 of the Kingsley receiver burned out. As no spare
6C8 is carried the socket was rewired and tube 6SN7 installed.
Operation was excellent. All transmissions were copied
without delay using 8470 KC's.

(M) R.D.R.

SD R.D.R.:
There were no major defects outside of tube replacement
but operation was inconsistent. Despite apparent tuning it
failed to pick up pips at 6 and 8 mile ranges. SD was
tuned on 14 pips for maximum echoes. On the return trip
got plane contacts at 14 and 24 mile ranges.

-49-

— page 217 —
SJ R.D.R:
SJ motor generator set failed after the first day
out and the temperature control resistor could not
properly be adjusted. The supply from the IC board
worked satisfactorily except during battery charging.
when fuse trouble was unusual.
The SJ was a great aid in both in navigation and
for a quick picture of the attack problem. During the
night attack the SJ showed two blurred pips giving
evidence of the burning ship. The tanker on the "scope"
appears as double pips due to the construction and
simplifies the radar operator's
job of staying on one track when tracking in convoy.
The new water assures positive tuning often
especially after depth charging.

(N) SOUND GEAR AND SOUND CONDITIONS

In general sound gear operation was satisfactory.
On 14 July transformer P-1407 in the B driver burned
out. Since no spare was carried the B driver was in-
operative for the remainder of the patrol. The burned
out 3-38 regulator tube in the J was replaced by
a spare that had previously broken and had been
repaired. Operation for the remainder of the patrol
was inferior to previous performance, sound ranges de-
creasing by 40%. Excessive sparking at commutator of
the port sound training motors caused excessive
splashing up from the pit log bilge. It is recommended
that the training motors be mounted vertically on forward
torpedo room after bulkhead to prevent the torpedo
room bilges will invariably flood out the motors or
cause them to operate excessively noisy.
Sound conditions with the contact
on 7 August were fair to good. The J picked up screw
noises of a tanker at an estimated range of 20000
yards in Sibutu Passage on 14 July. Echo ranging was
picked up on CB at an estimated range of 40000 yards and
on JK at 32000 yards off the west coast of Mindanao
on 16 July. Sound condition off the east coast of Pal-
awan were very poor, echo ranging and screw noises of a
DD at 0 being picked up simultaneously at a range of

-50-

— page 218 —
9000 yds on QB. JK maximum detection ranges were appro-
ci bly less than those on the QB. The two receivers were
interchanged with no noticeable result. It is therefore
believed that the crystals of the JK head are defective.

(0) DENSITY LAYERS

Density l layers in the Sulu Sea showed a gradual drop
in temperature of 10° to 400 feet, usually beginning at
180 feet. Bathythermograph cards are being forwarded to
the Hydrographic Office.

(7) HEALTH, FOOD AND HABITABILITY

Health of the crew was generally good. However the
majority of the Officers and crew departed on patrol with
heavy chest colds, a result of the foul weather encoun-
tered during the training period. All colds cleared up
though, before we arrived on station. The only bed patient
suffered from Tonsillitis, acute, but he responded to Sul-
phadiazine Tablets treatment and was standing watches in
after 4 days. One man suffered an abscessed right hand
and was given Sulphadiazine Tablets. A small incision to
facilitate its drainage and continuous hot saline dressings
promptly healed the abscess. Carried on the sick list for
five days. This excellent record is attributed to the
conscientious preventative efforts of CMM I.H. ROTHENBURG,
USN.

The quality of the food prepared was excellent through-
out the patrol. Canned seafood provided a welcomed variety.
A greater variety of fresh meat would be warmly appreciated.
Hands. We were especially fortunate in having baked
bread and delicious cakes and pies.
Fruit juices, especially new apple juice, were popular.
Habitability was good, despite 29 submerged
days as these were broken by a few days' surface running.

( ) PERSONNEL

The conduct of both Officers and men was in keeping
with the highest traditions of the Navy. The new men on
few exceptions quickly acclimated themselves to S/M life
and have developed very satisfactorily. Two men, both
class 3.0.'s, even qualified, on this, their first run.
Considerable time was spent by the Officers in teaching
and qualifying the men in their various departments. Round
table discussions-lectures were held in the wardroom for all
Officers in which each department was "hashed" over and much
benefit was derived by both qualified and unqualified Offi-
cers. This practice is expected to be followed on future
runs.

Nine Officers were again carried this patrol, and the
advantage of "dead-heading" and rotation of jobs greatly
outnumbers the disadvantage of little crowding.

-51-

— page 219 —
(R) MILES STEAMED - FUEL USED
Fremantle to area - 1760 Miles; 25200 gallons.
In area - 6857 Miles; 73750 gallons.
Area to Fremantle - 1610 Miles; 22735 gallons.
TOTAL 10227 Miles; 121685 gallons.

(S) DURATION
Days enroute to area (barrier) - 7 days
Days in area - 35 days
Days enroute to base - 6 days
Days submerged - 29 days

(T) FACTORS OF ENDURANCE
Torpedoes | Fuel | Provisions | Personnel
7 | 6067 gal. | 20 days | 14 days
Limiting factor this patrol: Patrol terminated by
provisions or operating orders.

(U) REMARKS
The work performed by Refit Crew #161 was out-
standing and is greatly appreciated by officers and
men. I believe the present system of each division
refitting it's own boats is far superior to previous
systems. Also except for it's work on TBT'S, #1
periscope packing, radar, sound, radio and I.C.
systems, the tender work was excellent.
This was our first patrol SJ-1 and PPI. It's
value is immeasurable. However it's performance
is erratic and requires frequent tuning, partic-
ularly after depth charging. Our equipment be-
came more sensitive as the patrol progressed due
probably to increased experience of operating per-
sonnel and the removal of a few bugs. However, we
still are getting the extreme ranges mentioned by
some boats in their patrol reports.
An indicator giving the direction of depth
charges and underwater explosions would be valuable
and might have permitted attacks on two different
occasions during this patrol.
On several occasions we have discovered neg-
ative gradients of more than 14°F. The deeper the
depth the greater the gradient; therefore, deep

-52-

— page 220 —
boats in these areas should have larger negative tanks
than at present installation. I believe negative tank
capacity should be increased at least 12000 pounds.
The value of the silent IMO hydraulic plant and the
Gould Trim Pump is lessened by the noisy features of the
Portsmouth Drum type controllers on each.
For operations in the clear waters of our areas I
believe a darker paint on the superstructure and shears
above the main deck is advantageous. With this dark
paint as a permanent base, a lighter, washable chalk
water-paint could be easily slapped on for night attacks
or even routine night patrols on moonlight nights. On
diving this water paint would wash off. It might make
the diving point, but at night would not be more notice-
able than the diving slick. However probably before this
could be developed, we will be out of the Philippine
and around Japan, I hope.
The radiomen, on their own initiative, organized
skits with music and sound effects and presented pro-
grams over the RBO system during the CABRILL'S 4th War
Patrol. The Lone Ranger and other programs were so
popular with everyone on board that the program was pre-
sented on a much larger scale during the 5th patrol.
Using an old pre-amp on board and some spare radio parts
the radiomen "manufactured" their own broadcasting sys-
tem. The pre-amp was re-wired so that the tone control
was in parallel with the volume control, thus making two
volume controls. An additional phone jack was installed
in which a mike was plugged. Volume control could there-
fore separate for phonograph and the voice. The single
output of the pre-amp was coupled to the phonograph ter-
minals of the RBO receiver sending the pre-amp output
through the RBO amplifier stages of the entire system
was very successful and as stated before extremely pop-
ular.

-53-

— page 221 —
[HANDWRITTEN: 3020]
SUBMARINE SQUADRON SIXTEEN

PC5-16/A16-3
Serial (023)

FIRST ENDORSEMENT to:
USS CABRILLA War Patrol
Report No. 5 dated 19
August 1944.

CONFIDENTIAL

From:
To:
Via:

Subject:

Care of Fleet Post Office,
San Francisco, California.
25 August 1944.

Commander Submarine Squadron SIXTEEN (Administrative).
Commander-in-Chief, U. S. Fleet.
(1) Commander Submarines, SEVENTH FLEET.
(2) Commander, SEVENTH FLEET.

U. S. S. CABRILLA (SS288) - Report of Fifth War Patrol - Comments on.

1. The fifth war patrol of the U.S.S. CABRILLA was conducted in the Sulu
Sea from 3 July to 19 August 1944. It was of forty-eight days duration with thirty-
five days spent North of the Barrier. Twenty-nine days were spent submerged.

2. On this aggressive patrol fifteen torpedoes were fired at enemy
ships and seven hits were made.

Attack No. 1 - A daylight periscope attack on an air screened convoy of one
AP, one AO and two AK's with five escorts. Two hits were heard out of four
torpedoes fired at an AP. This attack was made from an excellent position
and close depth charging followed immediately. Two torpedoes fired at an AK
apparently missed.

Attack No. 2 - A night surface attack on the same convoy. Two hits were
observed out of four bow tube torpedoes fired at an AO, two hits were ob-
served out of two bow tube torpedoes fired at the middle AK and one hit was
observed out of three stern tube torpedoes fired. This was
a well conducted attack. Flooding was made use of radar bearings for fir-
ing necessary.

3. The refit should be completed in the normal time. The damage to
seven torpedo tube outer door will be investigated in drydock together with the
for shaft squeal. A small amount of oil which entered No. One main generator
the commutator and bearing will be cleared out.

4. The health and morale of the crew was excellent on return from
patrol.

5. The Commanding Officer, Officers and Crew are heartily congratulated
on the important damage inflicted on the enemy.

Copy to:
CSS-16

[SIGNATURE: H. C. Patterson, Jr.]
G. W. PATTERSON, Jr.

10 01253

— page 222 —
[HANDWRITTEN: OM11095]
F324-71/A16-3
Serial 0977
[STAMP: # 9-02664]
C-O-N-F-I-D-E-N-T-I-A-L

[HANDWRITTEN: A16-3(2)(c)]
UNITED STATES NAVY
12a/ms
3 September 1944.

SECOND ENDORSEMENT to:
USS CABRILLA Conf. Ltr.
A16-3 no serial dated
19 Aug. 1944. Report
of Fifth War Patrol.

From: The Commander Submarines, SEVENTH FLEET.
To : The Commander-in-Chief, UNITED STATES FLEET.
Via : The Commander SEVENTH FLEET.

Subject: USS CABRILLA (SS288) - Report of Fifth War Patrol -
Comment on.

1. The Fifth War Patrol of CABRILLA was conducted in the
SULU SEA.

2. All contacts were developed with skill and deter-
mination. The high spot of the patrol was the well executed night
surface attack against one AO and two AKs, escorted by one DE and
four PCs. The three large ships were destroyed in a single attack.
This completely wiped out all but the escorts in this convoy, a
large AP having been sunk in a submerged attack during the preced-
ing afternoon.

3. CABRILLA experienced two torpedo casualties during
this patrol. One Mark 23 torpedo made a hot run in the tube
while it was being made ready for firing. It was forced past a
defective stop bolt while water was being blown into the tube from
WRT. A Mark 18 torpedo made a hot run while being loaded into the
tube. This torpedo was jettisoned and the cause of this casualty
cannot be determined.

4. This patrol is designated "successful" for the award
of the Submarine Combat Insignia.

5. The Force Commander congratulates CABRILLA Commanding
Officer, Officers, and Crew, on this excellent patrol in which the
following damage was inflicted on the enemy:

SUNK
1 AP (KASIMA MARU Class - EC) 9,900 Tons (Attack No. 1)
1 AO (Large - EU) 10,000 Tons (Attack No. 2)
1 AK (Medium - EU) 4,000 Tons (Attack No. 2)
1 AK (Medium - EU) 4,000 Tons (Attack No. 2)
Total 27,900 Tons.

[SIGNATURE: R. W. Christie]
R. W. CHRISTIE. [STAMP: 10 01335]
- 1 -
ORIGINAL COPY

— page 223 —
FB24-71/A16-3
Serial: 0977
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
USS GABRILLA Conf. Ltr.
A16-3 no serial dated
19 Aug. 1944. Report
of Fifth War Patrol.

Subject: USS GABRILLA (SS298) - Report of Fifth War Patrol -
Comment on.

DISTRIBUTION:
Cominch (2) (Direct)
Vice Opnav (1) (Direct)
Vice Opnav Op-23c (1)
Com1stFlt (1)
Com2ndFlt (1)
Com3rdFlt (1)
Com7thFlt (2)
ComSubslstFlt (30)
ComSubs2ndFlt (1)
CTF-71 (2)
CTG-71.5 (1)

[HANDWRITTEN: 2 7 Jt]
P. F. STRAUB, Jr.,
Flag Secretary. UNITED STATES NAVY
12a/ms
3 September 1944

CSS-72 (2)
CSS-12 (1)
CSS-16 (1)
CSS-18 (1)
DivComSubRon-12 (1)
DivComSubRon-16 (1)
DivComSubRon-18 (1)
[UNCLEAR: Sub School M.I. Joun.] (2)
[UNCLEAR: S.I.C.] Sub. Tr. Island (1)
S/MS 75 Flt. (1)

THIS REPORT WILL BE DESTROYED PRIOR TO
ENTRY INTO ENEMY CONTROLLED WATERS.

[STAMP: RECEIVED
COMMASTER
18 OCT 1944
STYX-X-15]
[HANDWRITTEN: 17888]
- 2 -

— page 224 —
UNITED STATES FLEET
COMMANDER SEVENTH FLEET

A16-3(F-3-4/whr)
Serial 02691

[STAMP: Reg. No. [HANDWRITTEN: 13/84]]
[STAMP: R.S. No. [HANDWRITTEN: 13 01036]]
[STAMP: [HANDWRITTEN: 24 OCT 1944]]

CONFIDENTIAL

THIRD ENDORSEMENT to:
CO, U.S.S. CABRILLA
(SS288) Conf. Ltr. of
19 August 1944.

From: Commander Seventh Fleet.
To : Commander in Chief, United States Fleet.
Subject: U.S.S. CABRILLA (SS288) - Report of Fifth War
          Patrol - Comment on.

1. Forwarded.

2. The Commander Seventh Fleet takes pleasure in
congratulating the Commanding Officer, officers and crew of
the U.S.S. CABRILLA for their skillful execution of this
patrol during which 27,900 tons of enemy shipping was destroyed.

[SIGNATURE: C.E. Van Hook]
C. E. VAN HOOK,
Deputy.

Copy to:
ComSubRon (16)
ComSubs 7th Flt.
CO, U.S.S. CABRILLA (SS288)

— page 225 —
SS288/A16-3
CONFIDENTIAL (crossed out)
[STAMP: DECLASSIFIED]

U.S.S. CABRILLA SS288

From: Commanding Officer, U.S.S. CABRILLA SS288.
To : Commander-in-Chief, United States Fleet.
Via : Official Channels.
Subject: U.S.S. CABRILLA, report of War Patrol
Number SIX.
Enclosure: (A) Subject Report.
(B) Track Chart and Area Grid. (Comsubspac only).

1. Inclosures (A) and (B), covering the Sixth
war patrol of this vessel conducted in the South China Sea
during the period 13 September 1944 to 25 October 1944; is
forwarded herewith.

[SIGNATURE: W.C. Thompson]
W.C. THOMPSON

DECLASSIFIED ART. 0445, OPNAVINST 5510.C
BY [HANDWRITTEN: OP-09D2] DATE [HANDWRITTEN: 5/23/72]
[STAMP: DECLASSIFIED]

— page 226 —
C-O-N-F-I-D-E-N-T-I-A-L

(A) PROLOGUE
arrived Fremantle, W.A., 19 August from Fifth
War Patrol. Refit, including docking, was com-
pleted by Repair Unit #137 and SubDiv. 161 Relief
Crew. IFF was installed during refit.

2 Sept. to 13 Sept. 1944
Loaded stores; sound tests; deep submergence;
three days of day and night training including
convoy attack and the firing of two steam torpe
does; conducted supersonic cavitation tests; took
magnetic signature; degaussed by Flash "D". De-
parture was delayed two days due to repeated low
readings and presence of oil in #1 main generator.
Fired dummy torpedo from #7 tube, satisfactory.

(B) NARRATIVE (all times HOW unless otherwise indicated)

Names of Officers and C.P.O.'s *No. Patrols

Lt.Comdr. W.C. THOMPSON, USN. 8
Lieut. T.F. GREFE, USNR. 6
Lieut. S.A. RISHOUD, USNR. 6
Lieut. W.L. GROSSETTA, USN. 5
Lt.(jg) J.F. CALABRESE, USNR. 2
Lt.(jg) M.J. VAN NATTA, USN. 5
Ensign J.W. TALBOTT, USN. 3
Ensign P.L. PINSON, USN. 3
Ensign B.R. HEITMAN, USNR. 2

CRAWFORD, Chester (n), 380 92 96,
CEM(AA)(T), USN. 6
PERSICO, Donato (n), 238 55 59,
CTM(AA)(T), USN. 14
GREEVERT, Frank Eldred, 320 96 09,
CMOMM(A), USN. 9
BEIGERT, Albert Edward, 207 24 64,
CMOMM(A)(T), USN. 11
ZELAZNICKI, Joseph (n), 410 31 59,
CEM(A), USN. 13
ROTHENBURG, Irving Malcolm, 256 32 74,
CPHM(A), USN. 6

*Includes present CABRILLA Sixth Patrol.

13 Sept.
1300 Departed Fremantle for Patrol area via Exmouth
Gulf, W.A. in accordance with ComTaskGroup Seven-
ty One OpOrd 130-44 of 12 Sept. 1944.

-1-

— page 227 —
13 Sept.
1500-1900           Conducting training exercises including
                    valuable instruction of sound operators by
                    Lieut. BENNETT, USNR and calibration of
                    Bendix log by base personnel. Immediately
                    cancelled log calibration when Executive
                    Officer was emphaticlly informed by base
                    log "experts" that log reads erratic due to
                    currents in this area. Transferred base
                    experts and Lieut. BENNETT. Bennett's
                    tips and instructions were the most valuable
                    sound help we have yet received. I suggest
                    his notes be mimeographed and given all subs
                    as it is a large dose for the regretably short
                    period he is able to work with the sound off-
                    icer and men.

1900-2310           Convoy exercises.

2310                Set course for Exmouth via bombing restriction
                    lane conducting training exercises enroute.

14-15 Sept.         Enroute Exmouth Gulf.

15 Sept.
2210                Challenged friendly submarine (believed Eng-
                    lish) who replied with proper color flare.

16 Sept.
0020                Challenged submarine (believed Dutch) with
                    blinker gun at 4800 yards. No reply, but
                    believed friendly so avoided. (Information
                    at Exmouth revealed that these were prob-
                    ably English and Dutch subs)

0907                Moored to Fuel Barge, Exmouth and received
                    13,000 gallons of fuel with the same first
                    class service and courtesies this vessel has
                    always received at this station.

1538                Underway after all hands had thoroughly en-
                    joyed a day of fishing, swimming and sun
                    bathing.

1715                Conducted most realistic Battle Surfaces
                    against ship wrecked at Exmouth entrance.
                    (Arrangements made with C.O. Exmouth) This
                    vessel has fired at this wreck (range 3500-
                    4000 yards) on each trip to Exmouth and we

                                        -2-

— page 228 —
16 Sept.
1715 heartily recommend this practice to all subs.
Two radar directed shots were on in range but off
in bearing. However they landed close together
and probably could be spotted on a large target
for a low % of hits.

1834 Set course for Lombok Strait.

17-18 Sept.
0135, 18 Sept.
Exchanged challenges by SJ radar with friendly
sub.

0410, 18 Sept.
Exchanged calls with GUNNEL by SJ radar.

19 Sept.
0832 Sighted unidentified U.S. Sub (ship contact #1)
on southerly course, bearing 332°T, 15,000 yards.

2120 Entering Lombok Strait on 3 engines to conserve
fuel. Extremely heavy turbulence and 8 knot
southerly set. SJ interference.

2205 SJ contact (ship contact #2) (U.S. Sub) bearing
044°T, 11,000 yards. He would not exchange calls.

2345 Clearing Strait without any enemy contacts. Set
course for Sekala Island at two engine speed.

20 Sept.
0025 SJ contact (ship contact #3) bearing 292°T, range
6000 yards. Avoided. Tracked on 030°T at 10 kts.

0214 SJ contact (ship contact #4) bearing 325°T, range
10,000 yards. Avoided as radar indicated small
target.

0545 Passed Sekala Island abeam to port, distance 12
miles. Set course for Cape William.

0800-0817 Trim dive.

1028 SD contact (aircraft contact #1) at 6 miles, sub-
merged.

1143 Surfaced.

1201 SD contact (aircraft contact #2) 9 miles. Sub-
merged.

-3-

— page 229 —
20 Sept.
1320 Surfaced.
1515 Sighted BETTY type plane (aircraft contact #3) bear-
     ing 270⁰T on opposite parallel course, distance
     about 15 miles.
2315 SJ contact (ship contact #5) bearing 054⁰T at 12,700
     yards. No SJ interference. Battle Stations, com-
     menced approach. Tracked at 15 knots on opposite
     parallel course. Believed U.S. Sub but decided to
     sight it.
2334 SJ interference suddenly appeared (probably had
     been out of commission). Broke off approach,
     exchanged calls with GROWLER.

21 Sept.
0030-0105 Avoided 5-6000 yard SJ contacts. Believed sailboats.
0344 SJ interference bearing 130⁰T. (probably ASPRO)
0521 Passed Cape William. Decided patrol eastern side
     of strait after many fruitless searches on Balik-
     Papan route.
1345 Sighted NALL type plane (aircraft contact #4)
     bearing 300⁰T and SD contact at 11 miles. Sub-
     merged.
1456 Surfaced.
1603 . SD contact (aircraft contact #5) 9 miles. Sub-
     merged.
1605½ Bomb explosion apparently directly overhead (We
     were at 200 feet, but were shaken a bit).
1608½ Second bomb explosion, believed near our diving
     point. Clouds were treacherous for surface run-
     ning anyway, so decided to stay submerged re-
     mainder of day.
1830 Surfaced. Closed Celebes coast, patrolling en-
     route Sibutu Pass.
2009 Investigated SJ contact, 10,000 yards, but it
     disappeared. Atmospheric??

22 Sept.
0351 SJ interference bearing 220⁰T, ASPRO probably.
                                        -4-

— page 230 —
22 Sept.
0509-0541 Trim Dive.

1050 SD contact (aircraft contact #6) 7 miles. Sub-
     merged. Conducted drills, eliminated air leak.

1341 Surfaced.

1547 SD contact (aircraft contact #7) 8 miles. Sub-
     merged.

1735 Surfaced.

1840 Exchanged calls with ASPRO on radar.

2230 Entered Sibutu Passage, favoring east side to
     search Tawi Tawi Bay. Bay and Passage were in-
     spected.

23 Sept.
     Attempted unsuccessfully to contact ASPRO by radar
     for joint search of Sulu Sea. Believing ASPRO
     passed east of Pearl Bank and heading for Pucio
     Point, decided to pass west of Pearl Bank heading
     for Pucio Point for increased coverage.

1022 Sighted spherical mine (Lat. 7°-38N, 119°-59E)
     1000 yards dead ahead. Horns were unusually long
     (est. 12 inches). Only a few barnacles were seen
     indicating its being planted within the last few
     months. Punctured it several times with B.A.R.
     sank it, without exploding, by 20MM fire. (3 full
     pans. Tsk!) Took pictures.

1505 Sighted an empty, large, gray, very rugged, dou-
     ble-ended CARVEL type lifeboat in excellent con-
     dition. No name or characters were visible. De-
     stroyed with 20MM, tho it remained afloat.

2100 Eliminated small rattle in superstructure after
     extensive search.

24 Sept.
0420 Contacted ASPRO. In view of ASPRO's proceeding
     on surface for Mindoro Strait and carrier raid
     on central Philippines, decided to dive off of
     Pucio Point hoping something may be flushed our
     way.

0542 Submerged for the day. Since outboard vents on
     #2&#3 sanitary tanks were not closed, reverted to
     fuel in bucket method as per 1941-1942. I daresay

-5-

— page 231 —
24 Sept.
0542 this mistake will never be duplicated on this vessel.
1819 Surfaced, proceeding Mindoro Strait.

25 Sept.
Planned to dive off Calavito Point since no indica-
tion of friendly sub in that vicinity.

0400 Chased 14,700 yard SJ contact bearing 161°T until
it disappeared. Tracked on 320°T at 14 knots.

0512 Battle Stations, chasing another 14,200 yard SJ
contact. Dived ahead of its track in dawn. Did not
hear or see target thereafter. Both believed atmos-
pheric. However, we are now submerged 5 miles West
of Tubile Point instead of Calavite. HADDO is prob-
ably off Calavite anyway.

0530 Secured Battle Stations.

0652 Sighted smoke bearing 234°T. Commenced approach.
Expecting all traffic to closely hug coast.

0720 Sighted several columns of smoke bearing 234°T.
Checked gradient at test depth. Echo ranging in
direction of smoke. True bearing is increasing,
c/c to 310°T closing at high speed at 150 feet.

0740 Stopped momentarily to check sound bearings.

0807 Sighted masts of six ships of assorted size, varying
from two medium freighters to two small sea trucks
and one DE or very large PC (ship contact #6). Bear-
ing 245°T, 12,000 yards. Battle Stations. c/c to
330°T. a/a standard.

0844 Bearing 251°T range about 10000 yards, angle on bow
almost 90°starboard. Formation is a very ragged
column led by DE with PC on near quarter. Target
speed 7 knots. Echo ranging is from two sources,
very spasmodic and not impressive. Unable to close
range to less than 8000 yards. Gave up chase.
Careful observation indicated no air coverage, how-
ever, attack is impossible before convoy arrival
at Manila. Considered contact report useless.

0929 Secured Battle Stations. Convoy apparently used
apo West Pass.

0942 Convoy disappeared, bearing 312°T.

1838 Surfaced. SJ and sight contact (ship contact #7)

-6-

— page 232 —
25 Sept.
1838 bearing 342°T, 6200 yards. Identified as a PC
who evidently quietly appeared with land back-
ground and was listening. On hearing us surface
he closed range but we soon lost him astern in a
rain squall. Remained about 8000 yards from him
hoping he preceded a convoy. PC occasionally
echo ranged for a few minutes (when underway) then
listened.

2000 TC headed for Apo West Pass at 15 knots. Set
course for area.

2013 Avoided 4500 SJ contact.

26 Sept.
0937 Sighted possible periscope. Avoided at flank
speed.

2045 Exchanged calls with ASPRO. Started coordinated
patrol 20 miles apart in areas Fox 6 and 7 at 2
engine speed on East-West courses.

27 Sept.
0610 Slowed patrol speed to 10 knots.

0809-0844 Trim dive.

2000 Shifted patrol stations to Fox 26; ASPRO in Fox 27.

2100 Tested voice circuit, satisfactory with ASPRO.

28 Sept.
0342 Arrived on station.

0535-0555 Dawn trim dive.

1500 Shifting patrol station to Fox 25; ASPRO to Fox 24.

2005 Several SJ contacts bearing 094°T, 29,550 yards.
Commenced tracking and approach, thinking of
Task Force. Finally concluded contacts were at-
mospheric after much erratic tracking and closing
in brilliant moonlight.

29 Sept.
0525 Submerged 5 miles NW Darigaros Point, Luzon for
submerged patrol.

0642-0710 Single distant expulsions.

-7-

— page 233 —
29 Sept.
1601 Sighted BETTY bomber (aircraft contact #8) bearing
      113°T, 5 miles on SE course.

1743 Sighted masts (ship contact #8) bearing 218°T.
      Commenced approach. Battle Stations.

1748 Bearing 223°T, range about 7000 yards, angle on
      bow 15° starboard. Target is small 7 knot coastal
      freighter (about 200 tons) preceded by small aux-
      iliary sailboat (escort?) both apparently unarmed.
      Closed to 2000 yards for close observation. Excel-
      lent gun targets but not on our first day in this
      area. Allowed to pass. Secured Battle Stations.

1839 Surfaced.

2330 Exchanging patrol stations with ASPRO.

30 Sept.
0532-0605 Dawn trim dive.

0900 SD contact (aircraft contact #9) 22 miles, faded.

1300 SD contact (aircraft contact #10) 24 miles, faded.

1448 SD contact (aircraft contact #11) 20 miles, closing.

1450 Sighted 5 or 6 BETTY bombers (aircraft contact #11),
      15 miles on SD. Dived.

1817 Surfaced.

2040 ASPRO reported two hits in AK of southbound convoy.

2230-2350 Notified WHITAKER in FLASHER of ASPRO's contact and
      that CABRILLA would dive off Cape Bolinao tomorrow.
      ASPRO assigned Fox 15 to rendezvous at Fox 24 on
      evening of 1st. if convenient, or Fox 19 on 2nd.

1 October
0345 Sighted searchlight apparently on Cape Bolinao
      pointed straight up.

0507 SJ interference bearing 210°T, believed LAPON.

0513 Submerged 13000 yards SW Cape Bolinao Light.

0748 Sighted RUFE plane (aircraft contact #12) over
      land on southerly course.

-8-

— page 234 —
1 October
0919 Echo ranging on 17.4 K.C.'s bearing 170°T. Com-
menced approach.

0933 Sighted smoke bearing 173°T. Two pingers now
audible.

0942 Manned tracking party. Checked temperature gradi-
ent at test depth.

1000 Manned Battle Stations.

1010 Bearing 165°T (ship contact #9). Believe we are
on target's track.

1017 Convoy consists of at least 3 tankers, several AKs
or AP-AKs, two DD escorts to seaward and one DE or
minelayer on convoy starboard bow. All ships are
zigging radically and individually, perhaps con-
stant helm. Range to selected large tanker 9000
yards, 40° Port angle on bow, sea rough (state 3).

1026 Bearing 155°T, 8000 yards. Sighted 1 RUFE and 1
PETE (aircraft contact #13) patrolling above and
ahead of convoy. Rigged for silent running and
depth charge.

1034 Bearing 133°T, 6000 yards, angle on bow 45° star-
board. Target making 120 RPMs. Checking on 9
knots.

1046 Inshore DE at about 1500 yards range headed to
speeded up, shifted to short scale pinging, and
two blocked a 2 flag signal hoist on port yard arm.
As his angle on bow was about 3° Port (we presented
him 15° Port angle) and all ships zigged toward,
we did not go deep. Set tubes forward on 4 feet
Just in case.

1048 No change but DE will come dangerously close.

1049 Just gray paint in low power. One very concen-
trated minute but at

1050 DE was by - must have passed about 50 yards away
down port side and now 500 yards astern. Mean-
while all targets had zigged away leaving us a
poor shot at the tanker. Shifted setup to an AK
AK bearing 155°T, 900 yards, 75° Port angle on bow.
Set depth 6 feet forward.

-9-

— page 235 —
1 October
1051 Commenced firing four torpedoes forward at M-AK.
Observed first three torpedoes running as certain
hits, so increased range 1000 yards and shifted re-
maining three to a small AK believed to be a tanker,
but possible small AK as bow was low in water,
partially overlapped by M-AK. Meanwhile observed
aircraft bomb land and explode off port bow shortly
after we commenced firing. IC rear guard headed
toward, range about 2000 yards. Observed three hits
on M-AK and it practically disintegrated and sank.
There was no target available for stern tubes ex-
cept DE coming in fast, so with complete setup on
T.D.C. let him have four down the throat at about
1100 yard torpedo run and started deep. Heard and
felt one properly timed hit on second target but
depth charging started about the time the DE should
have been hit, also the stern tubes were set on six
feet. Swung right with full rudder and full speed
to avoid sinking ship. Breaking up noises were very
loud and close.

1132 Last of 70 depth charges, some uncomfortably close.

1133 Japs are communicating with each other on sound gear.
Three separate sets of screws and sound equipment
stayed with us until 1300, frequently crossing over-
head (screws heard through hull) but no more depth
charges.

1300 Screws faded; however continued to hear echo ranging
in vicinity of attack until we surfaced.

1320 Careful periscope observation showed no smoke or no
sign of cripple, although two escorts were plainly
visible in direction of attack. We were about 5-6
miles from the scene and the visibility was excel-
lent. The beach (beyond the attack) was plainly
soon.

1328 Distant bomb or depth charge. Secured Battle Sta-
tions. Reloaded tubes. Resumed periscope patrol.

1528 Several distant depth charges.

1634 Three distant depth charges. Then six more.

1635 Seven distant depth charges. Then eight more.

1640 Eleven distant depth charges.

-10-

— page 236 —
1 October
1735 One then two more distant explosions all believed
to be in direction of pinging and near scene of
attack.

1838 Surfaced. Set course for rendezvous with HOE and
ASTRO in Fox 24.

1859 Radar and sight contact on LATON, 126°T, 9500
yards. Exchanged information. He had sighted
two DD's and one minelayer at 0838 but did not
observe our firing. His contacts were probably
the seaward escorts of the convoy, or were con-
ducting A/S search ahead and to seaward of the
convoy.

2200 Since neither HOE nor ASTRO appeared decided to
patrol Fox 18 for one day and incidentally rest,
check air leaks, shaft squeal, repair QC sound
gear, Pit log, investigate #2 poppet valve, re-
move growl from hydraulic accumulator, etc.

2 October
0530-0558 SD out of commission.

0630 Arrived on station, patrolling East-West line.

0755 Sighted NELL bomber (aircraft contact #14) in
light haze bearing 270°T about 9 miles on norther-
ly course.

0757 Submerged as plane entered clear visibility sector.

0900 Surfaced.

1136 Sighted NELL bomber (aircraft contact #15) bearing
030°T on easterly course, distance 11 miles.
Submerged for remainder of day. Stopped air leak,
repaired sound gear, but unable to lessen shaft
squeal which is very loud at greater than 2/3
speed, or locate trouble with #2 poppet.

1829 Surfaced. Set course for rendezvous in Fox 19.

2240 Exchanged information with ASTRO. Noted HOE's
interference.

3 October
0107-0200 In contact with HOE and ASTRO. Reported activi-
ty of wolf pack to date to HOE. Proceeding to patrol
station in Fox 25 as assigned by HOE.

-11-

— page 237 —
3 October
0521 Submerged 10 miles NW of Darigayos Point.
0655 Sighted possible smoke bearing 199°T. Later be-
    lieved to be a cloud.
0927 Sighted SALLY bomber (aircraft contact #16) at 3
    miles, zero angle on bow. 100 feet.
1424 Very distant explosion.
1428 Sighted unidentified plane (aircraft contact #17)
    bearing 020°T, 15 miles on SE course.
1454 Sighted and JP sound detected a ship (ship contact
    #10) bearing 131°T. Range about 8000 yards. Tar-
    gets on southerly course.
1458 Sighted tops of two more small vessels. This "convoy"
    consisted of one or two small inter-island steamers
    (Est. 500 tons) and a third small auxiliary sail-
    boat escort. No echo ranging was heard. They were
    close into shore for the beach and even if torpedo
    targets, were well past before we spotted them.
1836 Surfaced. Proceeding to rendezvous.

4 October
0100 Set course for Fox 3.
0700 Routine surface patrol of station, Lat. 18°-20'N,
    Long. 119°E.
0730 SD contact (aircraft contact #18) closed rapidly
    from 18 to 15 miles. Submerged.
0842 Surfaced.
1900 Directed by OTC to patrol off Cape Bojeador. Set
    course and speed to arrive prior dawn.

5 October
0326 Unidentified SJ interference bearing 050°T.
0521 Dived 4 miles West of Cape Bojeador for submerged
    patrol.
0621 Sighted two NELL bombers (aircraft contact #19)
    bearing 085°T, range 6 miles, on southerly course.
1818 Surfaced. Weather during day has been squally.
    Observations were made at 2/3 standard speed to
    keep from broaching. Set course for rendezvous in
    fox 14.
-12-

— page 238 —
5 October
1831 J contact (ship contact #11) 005°T, 4850 yards.
     Identified as SEA HORSE in our area (probably to
     seek quioter seas inside the point)

6 October
0100 assigned area SW Dile Point by HOE.

0515 Submerged 10 miles SW of Dile Point.

0631 Echo ranging bearing 150°T. Commenced approach.

0635 Sighted patrol (ship contact #12) about DE size.
     Do not believe torpedoes will hit him in these
     seas. Set depth 4 feet. Battle Stations.

0647 Target has single approximately 4" gun with shield
     forward, raked bow, built up bridge, stack amid-
     ships (well aft of bridge), built up section aft,
     1/4 inside stern, two tripod masts. Similar to
     CM-5 of ONI 41-42 but believed smaller. Maximum
     range was 6000 yards. Target speed varying be-
     tween 6 and 20 knots.

0710 Secured Battle Stations.

0823 Observed small power boat enter channel at Port
     San Esteban.

0838 Two distant explosions.

0839 Five explosions followed by four more.

0841 Four single explosions.

0845 Two explosions. Louder.

0903 Two explosions.

1029 Sighted smoke bearing 182°T. Commenced approach
     and tracking.

1050 JR reports echo ranging 185°T. Smokes bears 175°T.

1125 Sighted ZEKE (aircraft contact #20) bearing 162°T,
     circling. Ranging 166°T.

1141 Sighted D.VE (aircraft contact #21) plane bearing
     158°T distance 5 miles. Two sets of echo ranging.

1200 Smoke bears 152°T.

-13-

— page 239 —
6 October
1231 Sighted masts (ship contact #13) of single ship
bearing 146°T. Visibility is very poor due to sur-
face haze. Battle Stations. 100 feet between
observations.

1246 Bearing 141°T, 12000 yards; 80°Port angle on bow.
Set course to trap convoy (believed at this time
to consist of one ship with two escorts) off Dile
Point.

1303 Bearing 120°T, 11000 yards, sighted masts of sev-
eral ships.

1321 Single distant explosion.

1326 Bearing 099°T, 10000 yards; 80° Port angle on bow.
Closing const at standard speed, however our shaft
squeal is very pronounced.

1349 Rigged for silent running and depth charge.

1352 Convoy consists of about 15 ships divided into
three groups. Selected large AK in middle group
for target, bearing 071°T; 4100 yards, 25° Port
angle on bow. Large DD (Probably OTC), range 2500
yards, is closing in on our starboard beam flying
a 6 Or 7 flag signal. At least two planes are
searching ahead of each group and to seaward.

1356 Excellent setup on AK but it will soon overlap tanker
so waited, good check at 7 knots. DD blinking
searchlight in our direction.

1358 With bow of AK tangent to stern of large AO, commen-
ced firing six torpedoes forward with bow of AK as
point of aim. Bearing 058°T, 1800 yards range, 75°
Port angle on bow. Observed tremendous impulse
bubble or bubbles. There were no immediate targets
for stern tubes, and with DD coming in fast, 1500
yards on starboard bow, large impulse bubbles, and
plane coverage, started deep. Times check closely
for three hits in AK and two in tanker. Extremely
loud breaking up noises and internal explosions,
concentrated on two separate bearings, were heard
for more than 30 minutes. Hiding under a gradient
that was almost vertical to 380 feet, then almost
horizontal for an 18° drop.

-14-

— page 240 —
6 October
1430 Last of about 36 depth charges all of which seemed
      large and deep but not dangerously close. The
      first few salvos were poorly placed, however they
      found us for the next few salvos but then lost us
      completely although we could occasionally hear
      screws overhead.

1521 All screws faded out although pinging is very loud
      in direction of attack.

1553 Coming to periscope depth. Echo ranging getting
      louder as we decrease depth and remained loud un-
      til surfacing.

1619 Observed two escorts but no cripples at the scene
      of the attack. Sighted BETTY bomber (aircraft
      contact #22) zero angle on bow, 2 miles away. 100
      feet.

1631 Heavy explosion not too distant - falling water
      clearly audible through hull.

1646 Secured Battle Stations.

1707 Five fairly distant depth charges.

1833 Surfaced.

1935 Two SJ contacts (ship contact #14) 15000 yards and
      two sets of echo ranging on same bearing. Track-
      ing until reload is completed.

2026 Battle Stations. Commenced approach. Believe
      targets are DE's or large AM's because those were
      observed hunting us after the attack and because
      of the large radar ranges obtained. We are part-
      icularly anxious to knock those off on account of
      their antagonistic actions this afternoon. Moon
      rise is at 2140. Targets are in column. Plan to
      fire four forward at leading target, after tubes
      at second target.

2054 Targets zigzagged simultaneously toward leaving us
      on an open bearing, and wondered if they had picked
      us up on radar. Reversed course to fire stern
      tubes only at second ship. Range 4800 yards to
      target. Using TBT bearings.

2101 Fired stern tubes with 3100 yard torpedo run, 90°
      port track, zero gyros, target speed 9.5 knots.

-15-

— page 241 —
6 October
2101
The rascals did not even know they had been fired
at!! Further expenditure of torpedoes under these
conditions considered unjustifiable. Set course
for rendezvous. Secured Battle Stations. Mean-
while radar had completely searched area of attack
to the beach without contacts except for these
two targets.

2305
Reported results to HOE and requested sea area for
one day. Assigned area Fox 2.

7 October
0300
HOE reported a convoy contact. Set course to in-
tercept at full speed.

0400
Detected radar interference, believed ASWRO, bear-
ing 115°T. c/o to intercept.

0445
Heard distant explosion.

0458
Heard distant explosion.

0510
Heard distant explosion.

0512
SJ contact (ship contact #15) bearing 092°T, 22000
yards. Commenced tracking. Down is breaking.

0518
SJ interference had disappeared (ASWRO dived?)
Manned SD. Clearing area for ASWRO, tracking ahead.

0521
SJ contact (part of ship contact #15) on new target
063°T, 25000 yards. Believing this to be larger
target, shifted targets.

0536
Sighted target smoking heavily. Large port angle
on bow. 15000 yards range.

0541
Battle Stations. Target in plain view. Cannot
understand why he does not sight us but cannot
dive until we close track more.

0546
Dived. Range 11000 yards. Broad daylight. Clos-
ing at high speed for submerged approach.

0554
Observation. Target appears to be alone, zig-
zagging wildly. Evidently unit of convoy we attack-
ed yesterday and HOE and ASWRO have scattered them.
Set tube depth six feet and continued to close.
Starboard shaft making a lot of noise.

-16-

— page 242 —
7 October
0605 Target bearing 082°T, range 5000 yards, 35° Port
      angle on the bow.

0611 Bearing 067°T, 1800 yards, speed checking at 11.5
      knots. Flooded remaining four tubes. Rigged for
      silent running and depth char.

0613 Set-up still checking. No escorts! A lone AK!

0615 Commenced firing forward with practically zero
      gyros, 100° Port track, torpedo run 1400 yards.

0616 Saw two and heard three torpedoes hit. Target
      broke in half and sank.

0617 c/c away and went to 150 feet just in case a plane
      was overhead.

0630 Observation. All clear.

0645 Secured from Battle Stations and resumed normal
      periscope patrol, expecting remainder of convoy
      to be heading our way.

0822 Distant explosion.

0939 Distant explosion. Sighted BETTY bomber (aircraft
      contact #23) bearing 090°T, 12 miles.

0943 Single explosion.

0950 Single explosion.

0951 Three explosions. Weak echo ranging. Five explo-
      sions.

0952 Two then two more explosions. Three explosions.

0953 Single explosion. All clear on periscope.

1108 Echo ranging bearing 160°T. Smoke on same bearing.

1117 Sighted two ships. Three sets of echo rangers.
      Headed our direction and no torpedoes.

1155 Unable to avoid (believe it or not) so went deep.

1245 Nine explosions loud but distant. Echo ranging
      weaker, screws disappeared. Coming up to peris-
      cope depth.

-17-

— page 243 —
. 7 October
1310         Sighted tops of two ships. Convoy apparently pass-
             ed about 6000 yards to the south of us.

1416         Distant explosion.

1510         Surfaced. Attempted unsuccessfully to send con-
             tact report to HQ, but delivered it to SPRO.

1546         Sighted ZEKE (aircraft contact #24) bearing 070°T,
             5 miles on NE course. Dived.

1808         Surfaced. Reported results to HQE. Since HQE was
             in hot pursuit he directed C.BRILL to head north
             and report results to ConSubs7thFlt. for him.

8 October
0000         Lying to while transmitting C.BRILL Serial ONE.

0020         Transmission completed. Departing area for Pearl.

0214         Exchanged calls with SEA HORSE by SJ radar.

0520-0631    Down train dive.

0704         SD contact (aircraft contact #25) 8 miles. Dived.

0837         Surfaced.

0906         SD contact (aircraft contact #26) 20 miles.

0908         SD contact closing rapidly. Dived.

0919         Single distant explosion.

0920         Single distant explosion.

0922         Single distant explosion.

0923         Single distant explosion.

1013         Single distant explosion.

1035         Surfaced.

1116         SD contact (aircraft contact #27) 20 miles. Dis-
             appeared.

1147         SD contact (aircraft contact #28) 18 miles.

1149         Dived on closing contact.

             -13-

— page 244 —
8 October
1305 Single distant explosion.
1315 Single distant explosion.
1325 Single distant explosion.
1334 Single distant explosion.
1354 Surfaced.
1405 SJ contact (aircraft contact #29) 24 miles.
     Disappeared.
1414 SJ contact (believed aircraft contact #29) 7 miles.
     Dived. Turbo blower is out of commission and air
     was getting low due to the numerous dives. So
     decided to remain submerged for remainder of day.

1741 Surfaced.
1827 Exchanged calls with ASTRO by radar.
1845 c/c to 0900T.
2030 Shifted to Operational Control of ComSubPac.
2041 SJ contact (ship contact #17) 10000 yards. Track-
     ed at 3 knots and believed to be a patrol. Avoid-
     ed. Meanwhile attempted unsuccessfully to notify
     WHALE by voice that ASTRO and CABRILLA were at
     rendezvous and asking for their ETA.

9 October
0020 Upon receipt of WHALE's message headed toward at
     full speed to effect rendezvous prior daylight.
0220 ASTRO informs us rendezvous has been delayed one
     day due to possible enemy contact by WHALE and
     that WHALE could not work us by voice.
0550 Submerged for day near rendezvous.
1604 Surfaced. Headed toward radar interference.
2204 SJ contact on WHALE and ASTRO 12000 yards.

10 October
0026 Received information from WHALE by heaving line
     and expert seamanship on WHALE's part after we
     failed twice with line throwing gun and a near
     miss of ships. Set course for Pearl via safety
     lane.

-19-

— page 245 —
10 October
0556 Submerged for the day as we must delay a day to
     clear friendly forces.

1521 Single explosion. All clear on periscope.

1804 Surfaced.

1907 Exchanged calls with SNOOK by radar.

2020 SJ contact (ship contact #18) 065°T, 14000
     yards. Heavy interference so believed friend-
     ly. Probably SNOOK.

11 October
0000 Batan Island abeam to starboard, 13000 yards.

0517 Submerged for day.

1800 Surfaced.

2000 Interference from several radars. SD and IFF
     manned. Unable to exchange calls by radar.
     Spent next three hours retreating at various
     speeds to remain clear of contacts yet stay in
     safety lane.

2235 SD contact (aircraft contact #30) 6 miles. An-
     swered IFF. Hopeful he did not close to less
     than 3 miles.

2308 SJ contact (ship contact #19) bearing 075°T, 20000
     yards. Avoided.

2359 Radar interference well to north and getting weak-
     er. Resumed course at 17 knots for Pearl.

12 October
2000 (I) Slowed to two engine speed for remainder of trip.

13-19 October
          Enroute Pearl steering constant helm superimposed on
          zig plan during daylight. Conducting training dives
          and drills.

14 October
0849(I) SD contact (aircraft contact #31) 18 miles. Answered
        IFF.

15 October
1132(K) SD contact (aircraft contact #32) 16 miles. Answered
        IFF. PBY type. Closed to 8 miles then departed.

-20-

— page 246 —
15 October
1407(K) Three SD contacts (aircraft contact #33) 20 & 22
        miles.
1618(K) Sighted Liberator (aircraft contact #34) 10 miles.
        Fired smoke and exchanged recognition signals by
        searchlight. Another SD contact at 20 miles an-
        swered IFF.
1705(K) SD contact (aircraft contact #35) 25 miles. An-
        swered IFF.
16 October
1154(K) SD contact (aircraft contact #36) 32 miles. An-
        swered IFF.

19-20 October
        Ceased zig zagging during daylight. Repeated 20
        October, due to crossing International Date Line.
20-25 October
        Enroute to Pearl Harbor.

23 October
1329(WX) IFF contact (aircraft contact #37) 24 miles.
24 October
1518(VW) IFF contact (aircraft contact #38) 20 miles.
1832(VW) IFF contact (aircraft contact #39) 40 miles.
25 October
0120(VW) SJ contact, bearing 102°T 17000 yards. Avoided.
0827(VW) Rendezvoused with ASPRO and PC 579.
1315(VW) Moored to pier #9 Submarine Base, Pearl Harbor,
        T.H.

- 21 -

— page 247 —
(C) WEATHER

Weather conditions were good with a relatively
calm sea until arrival in South China Sea. State
THREE to FOUR seas were encountered in area with
occasional squally weather. General prevailing
winds were from the North East with seas from the
North.

(D) TIDAL INFORMATION

We were greeted with extremely turbulent rips and
an 8 knot Southerly set at Southern entrance to Lombok
Strait. This gradually decreased to the usual 2-3
knot set and both were partially avoided by favoring
the Western side of the Strait. The usual 1.1 knot
Southerly set was experienced in transiting Makassar
Strait.

(E) NAVIGATIONAL AIDS

No navigational lights were burning, but all light
houses encountered in patrol area were intact and prop-
erly located.
Because of low clouds and a general hazy atmosphere
along the West coast of Luzon, it was extremely difficult
to keep the ship's position cut in most of the time while
patrolling close inshore.
The SJ-1 radar, as usual, was invaluable while pat-
rolling along the coast and enroute to and from area.

(F) SHIP CONTACTS

# | Time | Lat. | Long. | Type | Range | Course | How | Remarks

— page 248 —
# | Time | Lat. | Type | Range | Course | P/W | Remarks
| Date | Long. | | Yards | Speed | Cont. | |
|---|---|---|---|---|---|---|---|
| 6 | 0807 | 13-13N | DD(?) | 13000 | 000°T | P | Unable to
| | 25 Sept. | 120-26E | TG, 4 K's | | 7 kts. | Sound | close
| | | | 1 AO | | | | |
|---|---|---|---|---|---|---|---|
| 7 | 1840 | 13-26N | TC | 6200 | 140°T | R | Appeared
| | 25 Sept. | 120-18E | | | 13 kts. | SN | small for
| | | | | | | | torp. avoided.
|---|---|---|---|---|---|---|---|
| 8 | 1743 | 17-05N | Coastal | 7000 | 015°T | P | Too small to
| | 29 Sept. | 120-18E | Freighter | | 7 kts. | | attack. avoided
| | | | Aux. Sailboat | | | | |
|---|---|---|---|---|---|

— page 250 —
Contact #
Date
Time

M Posit. Lat.
Long.
A Speed
R Trim
I Course
N Minutes since last
E S/D Radar search
B Number
A Type
I Probable Mission
R How contacted
C Initial Range (Miles)
R Elev. Angle
I Range & Rel. Bear.
T of plane when Jet. S/M
Sea (beaufort)
Direction Rel.
Visibility (miles)
Clouds (ht.100ft.)
Percent Overcast
Moon (bearing rel.)
Angle
Percent Illum.

| | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| Contact # | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Date | 20 Sep. | 20 Sep. | 20 Sep. | 21 Sep. | 21 Sep. | 22 Sep. | 29 Sep. | 29 Sep. |
| Time | 1201 | 1515 | 1345 | 1603 | 1547 | 1601 | 1700 | 1800 |
| M Posit. Lat. | 5-48S | 5-22S | 00-49S | 00-15S | 7-38N | 17-00N | 7-39N | 7-39N |
| Long. | 117-07E | 117-20E | 118-57E | 119-10E | 119-42E | 121-30E | 117-09E | 117-09E |
| A Speed | 14 K | 14 K | 14 K | 14 K | 14 K | 2 K | 14 K | 14 K |
| R Trim | Surf. | Surf. | Surf. | Surf. | Surf. | Surf. | Surf. | Surf. |
| I Course | 020°T | 026°T | 034°T | 000°T | 000°T | 180°T | 034°T | 034°T |
| N Minutes since last | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| E S/D Radar search | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| B Number | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| A Type | Unkwn. | BETTY | NELL | Unkwn. | Unkwn. | BETTY | Unkwn. | BETTY |
| I Probable Mission | Unkwn. | Patrol | Patrol | Unkwn. | Unkwn. | Patrol | Unkwn. | Patrol |
| R How contacted | Radar | I.G. | I.G. | Radar | Radar | Radar | Radar | Radar |
| C Initial Range (Miles) | 6 | 10 | 11 | 9 | 8 | 7 | 6 | 5 |
| R Elev. Angle | Unkwn. | 16 | 10° | Unkwn. | Unkwn. | Unkwn. | Unkwn. | Unkwn. |
| I Range & Rel. Bear. | N.J. | N.J. | N.J. | N.J. | N.J. | N.J. | N.J. | N.J. |
| T of plane when Jet. S/M | . | . | . | . | . | . | . | . |
| Sea (beaufort) | 1 | 2 | 1 | 1 | 3 | 1 | 1 | 1 |
| Direction Rel. | 045 | 080 | 070 | 060 | 180 | 180 | 070 | 180 |
| Visibility (miles) | 10 | 10 | 10 | 10 | 10 | 5 | 10 | 5 |
| Clouds (ht.100ft.) | 12 | 16 | 10 | 10 | 10 | 10 | 12 | 10 |
| Percent Overcast | 14 | 14 | 12 | 14 | 20 | 10 | 14 | 10 |
| Moon (bearing rel.) | - | - | - | - | - | - | - | - |
| Angle | - | - | - | - | - | - | - | - |
| Percent Illum. | - | - | - | - | - | - | - | - |

-25-

— page 251 —
Contact # | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16
S Date | 30 Sep. | 30 Sep. | 30 Sep. | 1 Oct. | 1 Oct. | 2 Oct. | 2 Oct. | 3 Oct.
U Time | 0900 | 1300 | 1448 | 0748 | 1026 | 0752 | 1136 | 0927
B Posit. Lat. | 16-56N | 16-55N | 16-56N | 16-15N | 16-13N | 17-22N | 17-22N | 17-01N
M Long. | 119-31E | 119-31E | 119-31E | 119-40E | 119-41E | 118-40E | 118-40E | 119-57E
M Speed | 10 K | 10 K | 10 K | 2 K | 2 K | 10 K | 10 K | 2 K
A Course | 090°T

— page 252 —
Contact /
| | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24
Date | 3 Oct. | 4 Oct. | 5 Oct. | 6 Oct. | 6 Oct. | 7 Oct. | 7 Oct. | 7 Oct.
Time | 1428 | 0730 | 0621 | 1125 | 1141 | 0939 | 1348 | 1516
B Posit. Lat. | 16-55N | 18-19N | 18-27N | 17-26N | 17-26N | 17-21N | 17-43N | 17-3N
N Long. | 120-17E | 119-05E | 120-27E | 120-17E | 120-17E | 119-20E | 119-03E | 119-03E
A Speed | 2 K | 10 K | 2 K | 2 K | 2 K | 10 K | 2 K | 2 K
R Course | 040°T | 270°T | 010°T | 000°T | 000°T | 220°T | 045°T | 045°T
I Trim | Per. | Surf. | Per. | Per. | Per. | Surf. | Surf. | Surf.
N Minutes since last | Subma. | Subma. | Subma. | Subma. | Subma. | Subma. | Subma. | Subma.
E SD radar search | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
A Number | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 2
I Type | Unkwn. | Unkwn. | NEIL | ZEKE | DAVE | BETTY | ZEKE | Unkwn.
R Probable Mission | Patrol | Patrol | Escort | Escort | Escort | Escort | Unkwn. | Unkwn.
C How contacted | Per. | Per. | Per. | Per. | Per. | L.O. | L.O. | L.O.
R Initial range(miles) | 14 | 18 | 6 | 3½ | 5 | 12 | 5 | 2
A Elev. Angle | 40 | Unkwn. | 60 | 2½ | 40 | 30 | 12 | 0
F Range & Rel. Bear. N.D. | N.D. | N.D. | N.D. | Unkwn. | Unkwn. | N.D. | N.D. | N.D.
N of Plane when det. S/M | 18 | 8 | 10 | 10 | 10 | 10 | 15 | 15
Sea (beaufort) | 2 | 6 | 2 | 2 | 2 | 2 | 2 | 2
Direction Rel. | 030 | 050 | 073 | 000 | 000 | 000 | 000 | 000
Visibility (miles) | 20 | 18 | 8 | 10 | 10 | 10 | 10 | 10
Clouds(ht.100 ft.) | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10
Percent overcast | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7
Moon (bearing) | - | - | - | - | - | - | - | -
Angle | - | - | - | - | - | - | - | -
Percent Illum. | - | - | - | - | - | - | - | -
Pursuit (hrs.) | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14
Pursuit (miles) | 26 | 8 | 7 | 7 | 7 | 7 | 7 | 41

-27-

— page 253 —
Contact #
Date
Time
Boat. Lat.
Posit. Long.
Speed
Trim
Course
Surf.
Temp.
Probable Mission
Type.
Number
Minutes since last C
SD radar search
How contacted
Initial Range (miles)
Elev. Angle
Range and Rel. Bear.
Type of Plane when Det.
Sea (beaufor)
Direction Rel.
Visibility (miles)
Clouds (ht. 100ft.)
Percent Overcast
Moon (bearing Rel.)
Angle
Percent Illum.

             25        26        27        28        29        30          31        32
             8 Oct.    8 Oct.    8 Oct.    8 Oct.    8 Oct.    11 Oct.     14 Oct.   15 Oct.
             0704      0905      1116      1147      1405      0055        0849      1132
             19-58N    20-05N    20-19N    20-21N    20-24N    20-24N      21-47N    22-07N
             119-45E   119-50E   119-56E   119-57E   119-37E   119-42E     136-12E   142-30E
             14 K      14 K      14 K      14 K      14 K      14 K        14 K      14 K
             Surf.     Surf.     Surf.     Surf.     Surf.     Surf.       Surf.     Surf.
             020°T     020°T     020°T     020°T     020°T     092°T       083°T     092°T
             0         0         0         0         0         0           0         0
             [blank]   [blank]   [blank]   [blank]   [blank]   [blank]     [blank]   [blank]
             Unkwn.    PBY         Unkwn.    PBY
             1         1         1         1         1         1           1         1
             Unkwn.    Unkwn.    Unkwn.    Unkwn.    Unkwn.    Unkwn.      Unkwn.    Unkwn.
             Radar
             8         20        20        18        24-7      16          18        16
             Unkwn.    Unkwn.    Unkwn.    Unkwn.    Unkwn.    Unkwn.      Unkwn.    Unkwn.
             N.D.      N.D.      N.D.      N.D.      Unkwn.    16M 085°    Unkwn.    16M 085°
             S/M       S/M       S/M       S/M       S/M       PBY         S/M       PBY
             3         3         3         3         2         2           2         2
             030       030       030       030       030       345         330       345
             15        12        12        12        12        10          14        10
             14        20        20        2

— page 254 —
Contact #
Date
Time
Posit. Lat.
       Long.
Speed
Trim
Course
Minutes since last
3D radar search
Number
Type
Probable Mission
How contacted
Initial Range(miles)
Range and Rel.Bear. N.D.
of Plane when Det. S/M
Elev. Angle
Direction Rel.
Visibility(miles)
Clouds(ht.1000ft.)
Percent overcast
Moon (bearing rel)
angle
Percent Illum.

See (beaufort
about 111m.

33 15 Oct. 1407 22-07N 143-08E 14 Surf. 092°T 0 1 Unkwn. Unkwn. Radar 24 Unkwn. Unkwn. 2 20 14 6 7 14
34 15 Oct. 1705 22-08N 143-44E 14 Surf. 092°T 0 1 B-24 Patrol Radar 20 Unkwn. Unkwn. 075 20 10 7 10 14
35 23 Oct. 1329 22-00N 167-26W 14 Surf. 105°T 0 1 Unkwn. Patrol Radar IFF 25 Unkwn. Unkwn. 4 20 18 6 18 10
36 24 Oct. 1154 21-57N 148-06E 14 Surf. 089°T 0 1 Unkwn. Patrol Radar IFF 32 Unkwn. Unkwn. 2 20 12 9 20 12
37 23 Oct. 1518 21-00N 167-47W 14 Surf. 090°T 0 1 Unkwn. Patrol Radar IFF 18 Unkwn. Unkwn. 095 20 10 7 10 14
38 24 Oct. 1832 21-00N 161-00W 14 Surf. 090°T 0 1 Unkwn. Patrol Radar IFF 20 Unkwn. Unkwn. 060 20 10 6 10 14
39 24 Oct. 1832 21-00N 161-00W 14 Surf. 090°T 0 1 Unkwn. Patrol Radar IFF 40 Unkwn. Unkwn. 060 20 10 6 10 14

-29-

— page 255 —
(H) Torpedo Attack #1, Patrol #6, Time: 1000H), Date 1
October 1944, Lat. 16°-15'N Long. 119°-43'E.

TARGET DATA - DAMAGE INFLICTED

Description:

A large convoy consisting of at least 3 large AO's,
at least 3 AK's or AP-AK's, 2 or 3 small 2000 ton AK's,
plus 3 large (2 DD, 1 DE) escorts and evidently about
10 PC's, was first detected by smoke, then by echo ranging.
Visibility was very good; seas rough (state 3). AO's were
on inshore side of convoy and were in approx. 180 line
bearing from leading AO. The larger AK's were 800-1000
yards to seaward of AO and were in no special formation.
The smaller AK's were inshore and also inside the formation
perhaps some doubling as additional escorts. Two DD's
on the seaward flank and one DE on starboard bow of convoy,
apparently crossing ahead of convoy in direction of next
zig, then returning to station. At least one PC was astern
of convoy. Air escort was composed of at least one float
type and one land plane. All ships were zigging simultan-
eously on short legs or perhaps constant helm or both,
since no two ships seemed to be on the same course at any
one time.

Approach was made on large AO but a large zig made
this an unfavorable shot and presented an ideal shot at an
AP-AK, an unident (as described below) and a DE.

SHIPS SUNK: One AP-AK (EU) similar to TEIYO MARU (6870 tons)
(pg.69 ONI 208J, revised) but perhaps slightly smaller.

SHIPS DAMAGE or PROBABLY SUNK: One ship (UN). Only the
raked bow of this ship was observed. It was
that of a loaded tanker or a smaller AK since
it seemed fairly low in the water.

DAMAGE DETERMINED BY:

The Commanding Officer observed AP-AK disintegrate
with 3 solid torpedo hits. A torpedo explosion was timed
closely for one hit with #4 torpedo in the unidentified
ship. After firing analysis also shows one hit. Torpedoes
probably ran under or hits were obscured by depth charg-
ing.

TARGET DATA
Torpedoes
1-2&3 Draft 23 ft. Course 044°T Speed 9 kts. Range 770 yds.
4-5-&6 Draft 28 ft. Course 044°T Speed 9 kts. Range 1605 yds.
7-8-9-10 Draft 10 ft. Course 131°T Speed 12 kts. Range 1500
yds.

-30-

— page 256 —
OWN SHIP DATA

(Bow Tubes) Speed 3 Course 102°T Depth 65 ft. Angle 0
(Stern Tubes) Speed 4 Course 110°T Depth 68 ft. Angle 1° down.

FIRE CONTROL AND TORPEDO DATA

In the early stages of the approach, periscope bear-
ings on the convoy's smoke, and later, sound bearings of
escort echo ranging, were used to track the convoy by T.D.C.
In this stage, ample time was available to submerge to
test depth in search of temperature gradients. In the
later approach stage, periscope ranges and bearings were
used to track the target, but due to erratic zigging and
similarity of 3 large 40's, difficulty was experienced
retaining contact on the same target; therefore the ap-
proach was conducted with the view of closing an AO in
the approximate center of the formation. QB & JF sound
bearings were continually used as a check on generated
T.D.C. bearings, while the JK sound gear was used to
search for escorts.

In the attack phase, the target was singled out and
brief periscope bearings and ranges were set into the T.D.C.
While firing, periscope bearings were taken before each
shot. Targets were shifted after the third shot and a new
set up on a ship further on and ahead of our first target
was set into the T.D.C. Again bearings were taken before
each shot. A quick set up on a DE for a stern tubes down
the throat firing failed. It is believed torpedoes ran
under the target. The first and third torpedoes were fired
to hit and the other two on either side. The last torpedoes
were fired on generated bearings.

-31-

— page 257 —
ATTACK # 1
                  1       2       3       4       5
Tube Fired        1       2       3       4       5
Track             90°P    96°P    101°P   120°P   122°F
Gyro              032     023     024     002     359
Depth             6       6       6       6       6
Power             -       -       -       -       High
Hit/Miss          Hit     Hit     Hit     Hit     Miss
Erratic           No      No      No      No      No
Mk. Torpedo       23      23      23      23      14-3A
Serial #          49411   49546   49705   49889   26180
Mk. Exploder      6-5     6-5     6-5     6-5     6-5
Serial #          21775   21779   25504   25642   17750
Actuation Set     Contact Contact Contact Contact Contact
Mk. War Head      16-1    16-1    16-1    16-1    16-1
Serial #          17024   34230   34267   12779   16411
Explosive         TTX     TTX     TTX     TTX     TTX
Firing Interval   -       7 Sec.  10 Sec. 6 Sec.  8 Sec.
Spread            0       3°L     3°R     0       3°L
Sea Condition     3       3       3       3       3
Overhaul Activity SUBIACO SUBIACO SUBIACO SUBIACO SUBIACO
Remarks:          #2 poppet did not operate - large impulse
                  bubble noted.

-32-

— page 258 —
ATTACK #1

Tube Fired        6        7        8        9        10
Track             124°T    3°S      3°S      3°S      3°S
Gyro              001      205      204      205      206
Depth             6        6        6        6        6
Power             High     -
Hit/Miss          Miss     Miss     Miss     Miss     Miss
Erratic           No       No       No       No       No
Mk. Torpedo       14-3A    23       23       23       23
Serial #          23728    50039    50118    50149    50160
Mk. Exploder      6-5      6-5      6-5      6-5      6-5
Serial #          7489     25880    25923    25929    25938
Actuation Set     Contact  Contact  Contact  Contact  Contact
Mk. War Head      16-1     16-1     16-1     16-1     16-1
Serial #          12941    17342    17419    17997    17975
Explosive         TTX      TTX      TTX      TTX      TTX
Firing Interval   12 Sec.  - - -    6 Sec.   6 Sec.   5 Sec.
Spread            2°R      0        1°L      0        1°R
Sea Conditions    3        3        3        3        3
Overhaul Activity SUBIACO  SUBIACO  SUBIACO  SUBIACO  SUBIACO
Remarks:          Believe torpedoes ran under target

-33-

— page 259 —
Torpedo attack #2, Patrol #6, Time: 1258(H), Date 6
October 1944, Lat. 17°-31'N, Long. 124°-21'E.

TARGET DATA - DAMAGE INFLICTED

Description:

Smoke was the first positive indication of this convoy
although many explosions were heard about two hours earlier.
Echo ranging later verified the smoke contact. Visibility
was poor due to a surface haze. Seas were rough (state 3).
This convoy consisted of approximately 15 ships divided
into three groups. The groups were in column and ships in
each group were bunched about 800-1000 yards apart. A
large new DD (similar to TERUTSUKI Class) was to seaward
of middle group and undoubtedly OTC of escorts and perhaps
of whole convoy as he was observed flying several flag
hoists and signalling by searchlight. At least one large
and one sea plane provided air cover, however the visibil-
ity must have made the planes practically useless. Several
smaller escorts were patrolling ahead and to seaward of
each group. Attacks were made on an AO and AK as described
below.

SHIPS SUNK: (a) One large loaded tanker (EU) similar to
RIKKO MARU (9182 tons) (pg.283 of ONI 208J
Revised) (or possibly SAN CLEMENTE type (7309
tons) (pg.284 of ONI 208J Revised).
(b) One new, streamlined AK (EU) similar to
TARUSHIMA MARU (4865 tons) (pg.102 of ONI 208J
Revised).

DAMAGE DETERMINED BY:

Post firing analysis and timed torpedo explosions in-
dicates two hits in AO and 3 hits in AK. Very loud and
persistent breaking-up noises were heard for almost 30 min-
utes after the attack. The bearings of these noises cover-
ed a wide sector and were loudest on two separate bearings.
The escorts remained in the area of the attack, probably
picking up survivors until after dark. Although the escorts
were visible 2 hours and 20 minutes after the attack, there
were no cripples in sight. Except for the two escorts,
there were no radar contacts in the area that night. The
screws of both targets were not heard again after firing.

TARGET DATA:

Draft 23 ft. Course 305°T Speed 7 kts. Range 1770 yards.
Draft 28 ft. Course 305°T Speed 7 kts. Range 2500 yards.

-34-

— page 260 —
OWN SHIP DATA

Speed 3 kts. Course 050°T to 040°T Depth 65 ft. angle 0

FIRE CONTROL AND TORPEDO DATA

This convoy was hugging the coast and was tracked
using periscope ranges and bearings and sound bearings
as T.D.C. inputs. Set course to trap convoy off Dile
Point instead of attempting immediate long range attack.
Very brief periscope observations were made to check the
firing inputs as the JK was used to check positions of
escorts. At firing, it was possible to wait until 2
ships overlapped, and check bearings were given for each
shot on the bow of the nearest and overlapping ship.
Torpedoes were spread 2° and 3 probably timed hits were
heard on the near ship and 2 on the far. A sound range
was attempted at firing but none was obtained.

-35-

— page 261 —
ATTACK # 2
Tube | 1 | 2 | 3 | 4 | 5 | 6
Track | 82°P | 83°P | 84°P | 85°P | 86°P | 87°P
Gyro | 353½ | 352 | 352 | 359 | 003 | 000
Depth | 6 ft. | 6 ft. | 6 ft. | 6 ft. | 6 ft. | 6 ft.
Power | High | High | - - - | - - - | - - - | - - -
Hit/Miss | Hit | Hit | Hit | Hit | Miss | Hit
Erratic | No | No | No | No | No | No
Mk. Torpedo | 14-3A | 14-3A | 23 | 23 | 23 | 23
Serial # | 25565 | 40299 | 50129 | 41410 | 53101 | 41132
Mk. Exploder | 6-5 | 6-5 | 6-5 | 6-5 | 6-5 | 6-5
Serial # | 25775 | 25802 | 25664 | 25820 | 25884 | 25812
Actuation | Contact | Contact | Contact | Contact | Contact | Contact
Mk. War Head | 16-1 | 16-1 | 16-1 | 16-1 | 16-1 | 16-1
Serial # | 34235 | 14169 | 17162 | 17465 | 3541 | 2061
Explosive | TPX | TPX | TPX | TPX | TPX | TPX
Firing Interval | - - - | 9 Sec. | 8 Sec. | 10 Sec. | 8 Sec. | 9 Sec.
Spread | 0 | 2°L | 4°L | 2°R | 4°R | 0
Sea Conditions | 3 | 3 | 3 | 3 | 3 | 3
Overhaul Activity | S U B I A C O | S U B I A C O
Remarks: #2 Poppet failed. Large impulse bubble noticed.
         #2&3 hit on far target. #1,4&6 on near target.

-36-

— page 262 —
(H) Torpedo attack #3, Patrol #6, Time: 2100 (H), Date 6
October 1944, Lat. 17°-29'N, Long 120°-17'E.

TARGET DATA - DAMAGE INFLICTED

Description:
This was a night surface radar attack on one of
two A/S vessels believed to be DE or large AM but
also similar to AM-11. The night was fairly dark
(about 40 minutes before moonrise) but the target
was readily visible at 4000 yards. The seas were
rough (state 3).

SHIPS SUNK or DAMAGED: None.

TARGET DATA
Draft 6 ft. Course 342°T Speed 9.5 kts. Range 3350 yards.

OWN SHIP DATA
Speed 10 kts. Course 260°T Depth On surface angle 0

FIRE CONTROL AND TORPEDO DATA
Radar contact at 15000 yards was made with the
escorts shortly after surfacing and were tracked
while reloading. Upon completion and only 40 min-
utes before moonrise, commenced attack immediately.
As the targets were roughly in column, planned to
fire remaining four bow tubes at the leading target
and the stern tubes at the second ship. Near the
firing point a large simultaneous zig toward placed
us almost ahead of the second target. Therefore
instead, fired four stern tube shot at second ship.
TBT bearings were somewhat erratic, due to roll and
yaw in the rough seas, and were averaged. With sat-
isfactorily close with TBT and radar data
fired stern tubes with 2° spread. The misses are
attributed to one or a combination of the following:
(a) Inexact solution due to roll and yaw of ship plus
excessive spread (60 yards was intended); (b) 5 foot
depth setting at probable shallow draft vessel (be-
lieved target to be DE or a large AM at time of fir-
ing and 5 feet to be minimum safe depth setting in
these seas); (c) heavy seas causing possible erratic
runs; (d) long range.

-37-

— page 263 —
TORPEDO ATTACK # 3

Tube Fired | 7 | 8 | 9 | 10
Track | 78°T | 79°T | 80°T | 82°T
Gyro | 185 | 183 | 179 | 184
Depth | 5 ft. | 5 ft. | 5 ft. | 5 ft.
Power | - - - | - - - | - - - | - - -
Hit/Miss | Miss | Miss | Miss | Miss
Erratic | | | |
Mk. Torpedo | 23 | 23 | 23 | 23
Serial # | 49444 | 50191 | 50249 | 50304
Mk. Exploder | 6-5 | 6-5 | 6-5 | 6-5
Actuation | Contact | Contact | Contact | Contact
Serial # | 25876 | 25943 | 26245 | 26288
Mk. War Head | 16-1 | 16-1 | 16-1 | 16-1
Serial # | 12961 | 17981 | 17989 | 17964
Explosive | TTX | TTX | TTX | TTX
Firing Interval | - - - | 11 Sec. | 11 Sec. | 9 Sec.
Spread | 0 | 2°L | 0 | 2°R
Sea Condition | 3 | 3 | 3 | 3
Overhaul | SUBIACO | SUBIACO | SUBIACO | SUBIACO
Remarks: | Misses due to: (1) Erratic TBT bearings.
| (2) Torpedoes may have run
| under target.
| (3) Heavy seas causing erratic
| run.
| (4) Long range.

-38-

— page 264 —
Torpedo ack #4, Patrol #6, Time: 06(H), Date 7
October 1944, Lat. 17°-50'N, Long. 119°-37'E.

TARGET DATA - DAMAGE INFLICTED

Description:

This was a day periscope attack on a lone freighter
believed to be a remnant of convoy attacked by us the 6th,
and by the HOE and ASPRO early morning 7th. The AK, zig-
zagging wildly, was apparently separated from the main
body or the convoy scattered. Seas were rough (state 3).

SHIPS SUNK: One AK (EU) similar to HUSIMI MARU (4900 tons)
(pg.101 of ONI 208J, revised).

DAMAGE DETERMINED BY:

Observed target break in the middle, turn over and
sink.

TARGET DATA

Draft 23 ft. Course 300°T, Speed 11½ kts. Range 1400 yds.

OWN SHIP DATA

Speed 3 kts., Course 028°T, Depth 65 ft., angle 0

FIRE CONTROL AND TORPEDO DATA

The target was contacted by radar shortly after morn-
ing twilight and it was tracked into a range of 11000 yards
a range at which it was plainly visible from the bridge.
Because of the good visibility it was decided to continue
the approach submerged. The target was unescorted and zig-
zagging radically at 11.5 knots. When it was believed that
the target had gotten by, he zigged towards putting us in
good approach position. Observations checked the T.D.C.
generated set up and at a range of 1400 yards for 100
port track, firing was commenced, entering a check bearing
for each shot. Torpedoes were spread 2½° for a linear
spread of 170 feet along the target's track. The QB & JP
sound gears were used to give continuous bearing checks on
the generated T.D.C. solution. At firing, sound ranges
were attempted but none were obtained. The JK was used to
search for escorts.

-39-

— page 265 —
ATTACK #4
Tube | 6 | 4 | 3 | 1
Track | 100°P | 102°P | 104°P | 108°P
Gyro | 352½ | 347 | 348 | 346½
Depth | 6 ft. | 6 ft. | 6 ft. | 6 ft.
Power | - | - | - | -
Hit/Miss | Hit | Miss | Hit | Hit
Erratic | No | No | No | No
Mk. Torpedo | 23 | 23 | 23 | 23
Serial # | 61886 | 50459 | 50311 | 50310
Mk. Exploder | 6-5 | 6-5 | 6-5 | 6-5
Serial # | 26444 | 26343 | 26338 | 26317
Actuation | Contact | Contact | Contact | Contact
Mk. War Head | 16-1 | 16-1 | 16-1 | 16-1
Serial # | 34220 | 16425 | 17400 | 17947
Explosive | TPX | TPX | TPX | TPX
Firing Interval | - | 10 Sec. | 9 Sec. | 10 Sec.
Spread | 0 | 2½°L | 0 | 2½°R
Sea Conditions | 3 | 3 | 3 | 3
Overhaul Activity | S U B I A C O | S U B I A C O
Remarks: | One torpedo was observed smoking heavily.

-40-

— page 266 —
(I) MINES
On 23 September in the Middle of Sulu Sea, position;
Lat. 7°-38'N, Long. 119°-59'E, a spherical, horned, contact
type floating mine was sighted and subsequently sunk by gun-
fire. No evidence of mine laying or sweeping was observed.

(J) ANTI-SUBMARINE MEASURES AND EVASION TACTICS

Enroute to the area fewer air patrols were encountered
than on previous passages in the same areas. However, air
cover for the convoys attacked along the west coast of Luzon
was composed of at least two planes and probably more. Both
float type and land based planes were used.
Although a few charges following the first attack were
large, deep and close, many others were much smaller and
well above. At least 3 escorts apparently "blanket" depth
charges or layed a barrage around the firing point. No
charges were believed smaller than about 100 lbs. however,
(assuming the usual charge to be about 300 lbs.). All depth
charges in the second attack were unusually large and deep
(most of these were dropped by DD, I believe).

(K) MAJOR DEFECTS

1. After depth charge attack on October 1st, the star-
board shaft developed a high whine at 80 turns. This noise
was very noticeable over sound gear and was plainly audible
in the after Torpedo Room. Extensive investigation however,
failed to reveal the source of the noise.

2. The Bendix log has been a source of trouble for sev-
eral runs and on one run was completely disassembled and re-
paired. (A practice not recommended by the Bendix Co.) Dur-
ing the training period readings were very erratic (submer-
ged, as high as 15 knots) and operation was sluggish. The
day of departure the base personnel adjusted the log so that
it would read fairly accurately, but about a week later, the
log stopped entirely. This was due to overloading and over-
heating of the follow-up motor. Correspondence received
during the last refit shows that greater loads than antici-
pated are sometimes place on this motor requiring it to be
replaced by a motor rated at twice its rating, and that has an en-
hanced cooling fan. By cleaning D.R.A.I. and repeater selsyns
and rigging a fan to cool this follow-up motor, the log was
made to operate fairly accurately but required frequent ad-
justments.

3. On each firing of #2 tube during the last two patrols,
#2 poppet valve has not functioned. Complete checking by
ships' force and overhaul by the refit activity has found

-41-

— page 267 —
nothing wrong with the poppet valve system. When firing
inboard slugs, the operation in so far as can be checked
and observed, is normal, but when actually firing at
periscope depth the valve does not open. It appears
that the system does not receive sufficient air pressure
to force the water check open against the tube pressure
when the roller drops into the tube. However, the air
lines have been found clean and the operating linkages
and parts most free in operation.

4. Pilot valve on hydraulic accumulator does not
open completely for charging and result is a slow, noisy,
charging. The addition of a strong spring to the end of
pilot valve rocker arm would permit complete and positive
opening of the pilot valve. Packing on hydraulic ac-
cumulator piston leaked causing loss of 45-gallons of
hydraulic oil.

5. Only a few days out of port it was necessary to
renew #1 periscope packing. The flax packing was found
too hard to make an effective seal at depths greater
than periscope depth. Frequent greasing had failed to
soften the packing.

6. Gasket on negative tank vent blew out three times
during patrol. Another retaining ring on the outer di-
ameter of this gasket should prevent this casualty.

7. Grease lines on bow planes carried away and it
was necessary to remove them and install zerk fittings
at bearings. Subsequently, when greasing, a man had
to go down onto the planes to get to the fittings. It
was impossible to grease these fittings during heavy
seas encountered during large part of patrol.

8. The head flushing valves in the crews heads were
a continuous source of trouble. The poor grade of brass
used in these particular valves pitted up so badly that
it was necessary to grind in the seats several times.
We had to secure the head merged controls. A third
valve in the flushing line
will be requested during next refit or overhaul.

9. After an all day dive the turbo blow wouldn't
start. This was traced to the starting drum. The drum
was burned at the 2nd stage and the air gap between the
low voltage holding coil and clapper was too large, so
that with the reduced voltage the coil was ineffective
and would not hold the clapper. The drum would thus
return to the old position. The air gap was reduced
and the drum filed and sanded. Drum operation is now
normal.

-42-

— page 268 —
10. The range counter numbers on the model SJ-1 range
unit are very difficult to read in a backed out conning
tower. The numbers are too small and the counter window
too narrow for quick readings. In our installtion, the
range unit is mounted in a position that is awkward for the
operator; this will be remedied during the next refit.

11. Two indentification flares (mk. 10, drawn from the
U.S.S. EURYALE prior to departure on patrol) were pulled.
One failed to ignite and the other exploded with a report
that would have done credit to a 4" gun.

(L) RADIO

Radio reception was fair to poor. At 1600 Zebra 25
September (off Manila) VIXØ was too weak to copy on all
frequencies. Watch was immediately shifted to VHM. VIXØ
came in strength 2 about 2000 the same day and watch was
shifted back. For the next three days VIXØ signal strength
was very poor, often the dots could not be heard. No enemy
jamming was encountered but adverse weather conditions made
reception difficult in our area. Best recept-
ion was on the 12 and 16 MC band during daylight and on the
9 and 12 MC band at night. Considerable use was made of
convoy recco. It is believed however that the load on this
circuit (and consequently less DFing by enemy) can be effec-
tively reduced through efficient use of SJ radar keying.
The single transmission to CTF 71 was made on 8470 KC's.
VIXØ was raised after 15 minutes and the message was cleared
without further delay. Serial 22 of 7 October was not re-
ceived.

Haiku fox schedule was copied beginning 1230 zebra 8
October. Reception was good, being best on the 16 MC band
at night and 9 MC band during daylight. No enemy jamming
was encountered. Serial 4 of 10 October was not received.
Single transmission to NPM was sent with no difficulty.

(M) RADAR

SD operation was satisfactory. Fans in the vicinity of
the transmitter and receiver still cause interference and
have to be secured when operating SD. Material failures
consisted of the replacement of 8014A tubes when the sweep
became jittery and could not be adjusted and the replacing
of a burned out filament lead in the transmitter circuit.
This was a probable cause of the 8014A tubes failing. There
were no indications of enemy DFing.
The SJ-a performance was entirely satisfactory. Keying
of the SJ for identification and communication purposes was
again successfully employed.
Several radar interference patterns were picked up on
SJ which looked similar to another SJ operating. However it
was established that it was SE or SG radar or friendly sur-

-43-

— page 269 —
face units. enemy radar interference was noticed
during this patrol.
The material failures were as follows: (1) After
retuning it was noticed that wave pips were very weak
as well as targets in close. Since there were 350 hours
operation since overhaul on the set it was decided to
replace the TR tube as per squadron orders. The mag-
netron (706AY) which had been showing signs of drifting
in its output frequency and also the klystron which had
been acting erratically were replaced. The set was re-
tuned and worked very well. (2) Due to depth charging
the PPI control unit and the PPI circuit were replaced.
(3) The regulator power supply unit "A" failed to deliver
any voltage to the main control unit and the plates of
the 5U4G were observed to be cherry red. The trouble
was traced to frayed connections on the voltmeter caused
by voltmeter shield. (4) a grinding noise was noticed in
the lower feeder unit of the antenna. The feeder was
pulled, greased and oil from the worm gear drained, flush-
ed with a cleaning fluid, and regreased and oiled. The
oil was dirty and too heavy and probably caused the noise.
Another method of tuning the SJ receiver besides
peaking for maximum pulse and wave pips was used. It
consisted of plugging in the headphones in the SJ keying
jack and tuning the IF stages for maximum noise caused
by sea return.

ARC No radar contacts have been obtained on this or
any patrol with this receiver which picks up all kinds
of ships' noises. When the TBL was being voice modulated
the ARC picked up the transmission on a frequency that
was neither the fundamental or a harmonic.

IFF This gear worked most satisfactorily and proved its
value in areas where friendly planes and surface units
are active. It was noticed that when a challenge was sent
(DN activated) a coded pip was obtained even though a
reply was not present on the SD screen. Ranges of 35 and
40 miles were obtained with this method.

(N) SOUND GEAR AND SOUND CONDITIONS

Sound gear was a source of continuous trouble during
the training period and beginning of the patrol. Super-
sonic cavitation curves were taken during the training
period but no sonic curves were obtained due to the JP
not being in operating condition. The single set of
crystal headphones for the JP went out prior to our arriv-
al on station. A set of 500 ohm phones was substituted
but the sensitivity of the set was decreased appreciably.
At least 2 sets of crystal phones are very necessary
since heavy perspiration causes the crystals to become

-44-

— page 270 —
damp, af which they were useless. was still very
valuable in detecting own ship noises as well as tracking.
The QB sound head was the most reliable for listening.
Initial contact was made on echo ranging of the convoy on
1 October in lat. 16-19N and long. 119-41E at an estimated
range of 30000 yards. This was repeated on 6 October in
lat. 17-22N and long. 120-18E at a range of 35000 yards.
Maximum range on screw noises were 12000 yards in both
instances. Attempts to get single ping ranges during the
attack on 6 October at a range of 1800 yards and again on
7 October in posit 18-04N, 119-30E at 2000 yards (periscope
ranges) were unsuccessful.
The port sound head was not in operation during the
first attack on 1 October. Trouble was found in plug to
lead going to the JK head. A very poor job of soldering
had resulted in the lead parting and making contact with
the grounded shield. A resulting loud buzzing noise in
the receiver completely drowned out all underwater noises.
The defect was remedied and operation was normal for this
head. The JK still is not as sensitive as the QB.

(O) DENSITY LAYERS

The density layers encountered were the usual gradual
negative gradient starting about 100 feet; dropping as
much as 18° in 400 feet.

(P) HEALTH, FOOD AND HABITABILITY

Health of the crew was good. There were only two cases
of minor ailments and these were quickly cured by the
Pharmacists Mate.

The food was well varied and excellently prepared dur-
ing the entire patrol. The quality of the meat was not
the choicest but clever preparation by the cooks overcame
that point. Installation of an ice-cream mixer by ships
force made possible the serving of varied-flavored ice-
cream throughout the entire period - a most welcome change
appreciated by all. Ovaltine, cold and hot, was by far the
most popular beverage aboard.

Habitability of the boat was increased by leaving the
air lock and water tight doors open, closing the starboard
supply dampers in the after battery, and taking a partial
suction through the conning tower hatch when on two en-
gines, and complete suction when on one engine, making
the boat several degrees cooler. Apparently the current
recommendations for ventilation (which were followed to the
letter) are not applicable to the Portsmouth type boat.

-45-

— page 272 —
(V) REMARKS

Communication by SJ radar offers a quick, secure method
that is not fully developed. In wolfpacking most of the
transmissions made with foresight, be cleared by radar in-
stead of by radio. We have worked other subs as distant
as 30 miles by SJ. The following suggestions would im-
prove these communications:
(1) Insure that all radar operators know the code; or at
least be able to detect another boat calling them and then
put a RM or QM on the radar.
(2) Use standard communications and "Q" signals where pos-
sible; or still better have a standard separate code.
Probably the codes (two letters) used by some Pearl wolf-
packs would be ideal with a few additions.
(3) Since many boats stow the searchlight below in the area,
all boats should man the SJ, when in sight contact, if
communications if no. already manned for other reasons.

Slow traffic in this area persistently hugged the
coast and anchored overnight until repeated coastal attacks
by ASPRO, CABRILLA and some of Whitaker's pack began to
drive them into the open. This painful process paid div-
idends however, for the last attacks of HOE, ASPRO and
CABRILLA were on a convoy that fled to seaward where all
three boats promptly hit it in the only chance presented
for wolfpacking.

-47-

— page 273 —
SUBMARINE SQUADRON FOUR 11/tel
Fleet Post Office,
San Francisco, California.
31 October 1944.

FCS-4/A16-3

Serial 0334

CONFIDENTIAL

FIRST ENDORSEMENT to:
U.S.S. CABRILLA Report
of Sixth War Patrol.

From: The Commander Submarine Squadron FOUR.
To: The Commander-in-Chief, United States Fleet.
Via: (1) The Commander Submarine Force, PACIFIC FLEET.
(2) The Commander-in-Chief, U.S. PACIFIC FLEET.

Subject: U.S.S. CABRILLA - Report of Sixth War Patrol.

1. The sixth war patrol of the U.S.S. CABRILLA was
conducted in the area along the west coast of the Philippines. The
patrol lasted 43 days, 19 of which were spent in the area, and was
terminated by expenditure of all torpedoes. Four attacks were made,
three of which resulted in the sinking of enemy ships. There were
39 aircraft contacts.

2. Attack #1 was a submerged, day, periscope attack on
a convoy consisting of 3 large AO's, 3 AK's and 2 or 3 small AK's
escorted by 3 DD's and 2 PC's. A large AO was selected as the target,
but close coverage by escorts and a last minute radical zig by the
target necessitated a quick shift, making an AP-AK the target. Three
torpedoes forward were fired at the AP-AK, all of which were observed
to hit. Target disintegrated and sank. Remaining 3 torpedoes for-
ward fired at a tanker (possibly an AK) with one timed but unobserved
hit. Four stern tubes were fired at a DE which was attacking the
CABRILLA. All missed. Heavy surface and air coverage forced the
CABRILLA to deep submergence.

3. Attack #2 was a submerged, day, periscope attack on
a 15 ship convoy with surface and air escorts. Six torpedoes for-
ward were fired at an AK and AO. Three timed hits were noted on
the AK and 2 timed hits on the AO. Large impluse bubbles plus air
breaking-up by an escorting DD made deep submergence neces-
sary and prevented observation. Loud breaking-up noises
were heard for 30 minutes, indicating that at least one of the tar-
gets and probably both were sunk.

4. Attack #3 was a night surface attack on two targets
believed to be DE's or AK's. Four stern tubes were fired at range
of 3100 yards, zero gyro spread, 80° port track. All missed. Enemy
did not note CABRILLA's presence.

5. Attack #4 was a daylight periscope attack on a medium
AK, unescorted. Four tubes forward fired resulting in three hits.

- 1 -

— page 274 —
SUBMARINE SQUADRON FOUR 11/tel

FC5-4/A16-3
Fleet Post Office,
San Francisco, California.
Serial 0334
31 October 1944.

CONFIDENTIAL

FIRST ENDORSEMENT to:
U.S.S. CABRILLA Report
of Sixth War Patrol.

Subject: U.S.S. CABRILLA - Report of Sixth War Patrol.

— page 275 —
FORCE, PACIFIC FLEET nch
Care of Fleet Post Office,
San Francisco, California,
1 November 1944.

FT12-10/A16-3(15)

Serial 02398

CONFIDENTIAL

SECOND ENDORSEMENT to
CABRILLA Report of
Sixth War Patrol.

NOTE: THIS REPORT WILL BE
DESTROYED PRIOR TO
ENTERING PATROL AREA.

COMSUBSPAC PATROL REPORT NO. 562.
U.S.S. CABRILLA - SIXTH WAR PATROL.

From : The Commander Submarine Force, Pacific Fleet.
To : The Commander-in-Chief, United States Fleet.
Via : The Commander-in-Chief, U. S. Pacific Fleet.

Subject: U.S.S. CABRILLA (SS288) - Report of Sixth War Patrol.
(13 September to 25 October 1944).

1. The sixth war patrol of the CABRILLA was conducted in
Southwest Pacific Areas in the south China Sea and off the Coast of
Luzon. The CABRILLA, along with the U.S.S. HOE (SS258) and the
U.S.S. ASPRO (SS309) formed an attack group with the commanding officer
of the HOE as group commander.

2. This splendid patrol resulted in four aggressive, suc-
cessful attacks. Nineteen torpedoes were fired for twelve hits which
accounted for one large tanker, one large transport, and three AK's.
Detailed discussion with the commanding officer regarding Torpedo At-
tack No. 1 substantiates the sinking of one AP and one unidentified
ship during this attack. A possibility exists that a DE may have been
hit also, but evidence is insufficient to substantiate credit.

3. Award of the Submarine Combat Insignia for this patrol
is authorized.

4. The Commander Submarine Force, Pacific Fleet, congratu-
lates the commanding officer, officers, and crew for this outstanding
and highly successful patrol. The CABRILLA is credited with having
inflicted the following damage upon the enemy during this patrol, all
of which was accomplished in areas under the operational control of
the Commander Task Force SEVENTY-ONE who is requested to assume credit
accordingly:

S U N K
1 - AP (TEIYO MARU Type) (EC) - 6,900 tons (Attack No. 1)
1 - UN - 4,000 tons (Attack No. 1)
1 - AO (RIKKO MARU Type) (LC) - 9,200 tons (Attack No. 2)
1 - AK (TARUSIMA MARU Type) (LC) - 4,900 tons (Attack No. 2)
1 - AK (HUSIMI MARU Type) (LC) - 4,900 tons (Attack No. 4)

TOTAL SUNK 29,900 tons

Distribution and authentication - 1 - C. A. LOCKWOOD,
on following page.

EXTRA : [STAMP: ORIGINAL]
SORG. [STAMP: MICRO]
PHOTO-LAB OP-16
RETURN TO F-4253

— page 276 —
2020-10/A16-3(15)
Serial 02398
CONFIDENTIAL

SECOND ENDORSEMENT to
CABRILLA Report of
Sixth War Patrol.

COMSUBSPAC PATROL REPORT NO. 262.
U.S.S. CABRILLA - SIXTH WAR PATROL.

Subject: U.S.S. CABRILLA (SS288) - Report of Sixth War Patrol.
(13 September to 25 October 1944).

DISTRIBUTION:
(Complete Reports)
CominCh (7)
CNO (5)
CinCPac (6)
Intel.Gen.Pac.Ocean Areas (1)
ComServPac (1)
CinCLant (1)
ComSubsLant (8)
S/M School, NL (2)
CO, S/M Base, PH (1)
ComSoPac (2)
ComSoWesPac (2)
Com 7th (1)
Com 9th (2)
ComForPac (1)
ComSubPac (4)
ComSubPacSubOrdCom (2)
All Squadron and Division (2)
Commanders, Pacific
All Submarines, Pacific (1)
ComSubTrainPac (2)

[HANDWRITTEN: E. J. Spence and]
E. L. HINES, 2nd,
Flag Secretary.
SUBMARINE FORCE, PACIFIC FLEET
hch
Care of Fleet Post Office,
San Francisco, California.
1 November 1944.

NOTE: THIS REPORT WILL BE
DESTROYED PRIOR TO
ENTERING PATROL AREA.

— page 277 —
U.S.S. CABRILLA (SS288)
Fleet Post Office,
San Francisco, Calif.,
7 May 1945

SS288/A16-3
C-O[STAMP: DECLASSIFIED]

From: The Commanding Officer,
To : The Commander in Chief, United States Fleet.
Via : Official Channels.

Subject: U.S.S. CABRILLA (SS288), Report of War Patrol number SEVEN.

Enclosure: (A) Subject Report.
(B) Track Chart (ComSubPac-1) only.

1. Enclosure (A), covering the Seventh war patrol of this vessel
conducted in the KURIL Island Group and Polar Circuit during the period 20
March 1945 to 7 May 1945, is forwarded herewith.

[SIGNATURE: H.C. Lauriman]
H.C. LAURIMAN.

[STAMP: DECLASSIFIED]
DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY [HANDWRITTEN: OP-09B9C] DATE [HANDWRITTEN: 5/25/72]

— page 278 —
U.S.S. CABRILLA (SS288)
Report of 7th War Patrol.

SS288/A16-3
Serial (01-45)

C-O-N-F-I-D-E-N-T-I-A-L

(A) PROLOGUE
     Arrived San Francisco, California on 3 November 1944. Commenced
scheduled Navy Yard Overhaul at Bethlehem Steel Company, Submarine Basin,
San Francisco, California. During the overhaul, the following noteworthy
alterations were accomplished: Complete ST Radar installation and Mark IV
Range and Bearing Repeaters installed in conning tower and control room;
shaped gaskets in all hatches and doors, plus bolted type blanks on all deck
hatches; removed 4" gun forward, installed 5"-25 aft; installed 40mm on for-
ward part of bridge deck; hydraulic periscope hoists were installed; both
sound training motors were bulkhead mounted. On 31 December 1944, Lt.Comdr.
H.C. LUERMAN, USN relieved Commander W.C. THOMPSON, USN, as Commanding
officer. The following officers were detached: Lt.Comdr. T.F. GRIFE,
USNR; Lieut. S.A. GROSSO, DE, USNR; Ensign K.E. GREEVER, USN. The follow-
ing officers reported aboard for duty: Lieut. J.B. ELLIOTT, Jr. DEM, USNR;
Lt.(jg) S.N. DONAHOE, DE, USNR. Transferred 23 men to SubAd, Mare Island
and various other submarine activities, and received 32 men aboard.
     Commenced Post Repair Availability trials on 19 January 1945. Departed San Fran-
cisco Area 4 February 1945 for San Diego. Arrived San Diego 6 February 1945
and commenced special exercises with West Coast Sound School for six days.
On 11 February 1945 found entire hydraulic system to be flooded with salt
water which necessitated disassembly of entire system and purging all lines.
This delayed our departure for a period of four days. Naval Repair Base
San Diego, and the machinists from Mare Island are to be commended for the
speed and efficiency with which this difficult task was completed. On 17
February 1945 departed San Diego for Pearl Harbor, T.H. Arrived Pearl Harbor
24 February 1945, for four days voyage repairs, eight days intensive training
seven days special exercises with anti-fouling gear which was installed and
removed in ARD-1, and two days for loading. Lt.(jg) M.J. VAN NATTA, USN was
detached and Ensign L.J. GOULET, D(L), USNR reported aboard for duty. Ready
for sea date 20 March 1945.

(B) Officers and CPO's on board and total patrols.

OFFICERS                                                Total Patrols**
Lt.Comdr. H.C. LUERMAN, USN                                     9
Lieut. J.B. ELLIOTT, Jr., DEM, USNR                             7
Lieut. W.A. GROSSETTA, USN                                      6
Lt.(jg) J.F. CALBRESE, D, USNR                                  3
Lt.(jg) S.N. DONAHOE, DE, USNR                                  2
Lt.(jg) J.W. TALBOTT, USN                                       4
Lt.(jg) P.W. PINSON, USN                                        3
Lt.(jg) B.R. WHITMAN, D(L), USNR                                1
Ensign L.J. GOULET, D(L), USNR

CPO's
DEVINE, W.A., CTM(AA)T, USN                                     2
ZELAZNICKI, J., CEM(T), USN                                    14

-1-

— page 279 —
U.S.S. CABRILLA (SS288) Report of 7th War Patrol

C-O-N-F-I-D-E-N-T-I-A-L

CPO's (con't)                                       Total Patrols

NELSON, W., ChOMM(T), USN                                     3
FOWLER, F.J., CRM(T) V-3, USNR                                8
STR.HORN, N.J., ChOMM(AA)T V6, USNR                           6
MATTHEWS, F.O., CRT(AA)T V-6, USNR                            6

                                            ** Includes CABRILLA 7th War Patrol.

20 March 1945
1330VW      Departed Pearl Harbor for Polar Circuit Patrol via Midway in accord-
            ance with Comtaskfor 17 Operation Order #66-45. PC escort until dark.

2000VW      Released escort, proceeding indepndently.

21-23 March 1945
            Enroute Midway conducting training dives and general drills enroute.

24 March 1945
1030Y       Arrived Midway. Received fuel and effected minor voyage repairs. De-
            parture delayed due to Bendix Log requiring approximately sixteen
            hours to repair.

25 March 1945
0900Y       Departed Midway for Patrol Area.

1200Y       Position: 28°-21'N 178°-54'W.

2230Y       Crossed International Date Line, dropped 26th of March from calendar.
            (also 2 birthdays).

27 March 1945
            Enroute to area conducting training dives and general drills.

1200M       Position: 29°-55'N 176°-56'E.

28 March 1945
            Enroute to area conducting training dives and general drills.

1200M       Position: 31°-03'N 173°-30'E.

29 March 1945
            Enroute to area conducting training dives and general drills.

1200L       Position: 33°-09'N 166°-50'E.

30 March 1945
            Enroute to area conducting training dives and general drills.

1200L       Position: 35°-37'N 160°-30'E.

                                            -2-

— page 280 —
U.S.S. CABRILLA (SS288) Report of 7th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

31 March 1945
        Enroute to area conducting training dives and general drills.
1200L. Position: 38°-01'N 154°-04'E.

1 April 1945
        Enroute to area conducting training dives. Weather has turned very
        cold, wet and gusty with a heavy beam sea thrown in for good measure.
1200K Position: 40°-55'N 148°-46'E.
2345K Made SJ contact on SHIKOTAN TO bearing 310°T, distance 27,000 yards.
        Visibility down to 500-1000 yards.

2 April 1945
0030K Commenced patrolling and investigating all possibilities of SHIKOTAN
        SUIDO. Closed island to 8,000 yards and searched all possible hiding
        places where a stray MARU might be bedded down for the night.
0200K TOKO SHIMA rocks abeam to starboard 7,500 yards. Only contacts so
        far have been numerous floes of ice. Visibility has lifted to
        horizon.
0300K HOKKAIDO TO abeam to starboard. Put on three engines and started for
        Run One in accordance with directive from ComSubPac.
0720K Made trim dive and usual search for a gradient which doesn't exist.
0745K Surfaced in a flat calm sea and heavy fog. All ahead standard.
1200L Position: 41°-45'N 144°-22'E.
1655K Sighted string of fish nets close aboard to starboard, nets marked
        with buoys very similar to Dan Buoys. Believe they have been carried
        offshore by wind and currents due to fact that they are in 800
        fathoms of water.
1740K Commenced converting #4FBT while lying to in fog.
1757K Completed conversion of #4FBT.
1800K Radar contact 36,000 yards, bearing 225°T, must be a Battleship.
        Manned Radar Tracking Party. Commenced tracking.
1827K Target looked like land at 20,000 yards. The Navigator and his assis-
        tant were hard put to convince everyone that it was impossible for
        land to be on that bearing.
1830K Target slowed from 30 knots to zero speed.

-3-

— page 281 —
U.S.S. CABRILLA (SS288) Report of 7th War Patrol
C-O-N-F-I-D-E-N-T-I-A-L

2 April 1945
1838K Target turned into what appeared to be a cloud or something very
        similar, on PPI and covered about 12° in bearing. Secured tracking.

1840K Radar contact on SHIRYA SAKI, bearing 270°T, distance 75,000 yards -
        sigh of relief from the Navigator.

2005K Submerged to flush out #4 FBT.

2010K Surfaced.

2017K APR contact on shore based sweeping radar. Believe it to be on
        SHIRYA SAKI. (See section U)

2125K APR contact on shore based radar. Believe it to be on ESAN SAKI.
        (See section U)

2146K First of numerous battleship and cruiser contacts on SJ which all
        proved to phantoms. Weather was foggy with about force 2 SE wind
        which according to our experts was very conducive to phantom pips.

2400K Commenced north and south patrol across TSUGARU KAIKYO.

3 April 1945
0230K Last of phantom pips, wind shifted to northwest, force 3-4 and visi-
        bility unlimited.

0625K Submerged to patrol off SHIRYA SAKI Light and approaches to TSUGARU
        KAIKYO. Many peculiar underwater noises heard throughout the day.
        Patrolled about 12-14,000 yards off beach. No contact all day.

1200K Position: 41°-30'N 141°-34'E.

1933K Surfaced and opened out to 33,000 yard from SHIRYA SAKI to commence
        night surface patrol.

4 April 1945
0030K Observed SHIRYA SAKI Light burning with normal characteristics. Com-
        menced patrolling across mouth of TSUGARU KAIKYO on course 050°T and
        230°T. By swinging ship and checking APR, determined radar was lo-
        cated on SHIRYA SAKI and ESAN SAKI. They do not pick us up until
        we close to 30,000 yards, at that range they commence lobe-switching.

0530K Dove and commenced submerged patrol 10-12,000 yards off SHIRYA SAKI.

0930K Sighted what appeared to be a submarine rounding SHIRYA SAKI. Closed
        to about 8,000 yards and found it to be a peculiarly shaped rock
        about 1,000 yards off northwest tip of SHIRYA SAKI. No further contacts.

1200K Position: 41°-33'N 141°-36'E.

-4-

— page 282 —
U.S.S. RILL (SS288) Report of 7th War Patrol,
C-O-N-F-I-D-E-N-T-I-A-L

4 April 1945
1944K Surfaced.
2000K Decided to make a tour of TSUGARU KAIKYO and explore possible MINE
        crossings.

5 April 1945
0000K With ESAN SAKI bearing 200°T, distance 13,000 yards, canged course to
        head for CHIKYU MISAKI. No contact but much lobe-switching from
        radar on ESAN SAKI.
0200K With CHIKYU MISAKI bearing 340°T, distance 15,000 yards, came around
        to head back across strait, still no contacts on our radar but much
        lobe-switching on the Japs!
0531K Submerged for usual patrol 6-8 miles off SHIRYU SAKI. No contacts
        all day, am beginning to believe the Japs have gone into hibernation
        till summer. The highest air temperatur enjoyed thus far is 34°F.
1200K Position: 41°-34'N 141°-36'E.
1945K Surfaced and decided to patrol a line northeast and southwest about
        35 miles south of SHIRYU SAKI.

6 April 1945
0527K Dove for submerged patrol off SHIRYU SAKI.
0830K Smoke contact Number 1!! Came to course 205°T all ahead standard.
0946K Identified smoke to be a small steam sampan or trawler of approx-
        imately 100 tons, staying about 1,000 yards off beach on course
        180°T, speed 7-8 knots.
0954K Came right to 010°T to stay clear of 35 fathom curve. SHIRYU SAKI
        bears 268°T, 6,500 yards (ST range)
1010K Ship contact Number 2. Sighted another small craft of almost
        identical characteristics on a northerly course, same distance off
        beach. This was the beginning of a parade of this type of craft
        which continued until 1700. During this period a total of 14 passed
        up and down the coast approximately 1,000 yards off the beach, speed
        7-8 knots, course either north or south. All rounded SHIRYU SAKI
        about 1,500 yards and continued to follow the shore line. Believe
        these are used to carry dry cargo up and down coast of HONSHU.
1200K Position: 41°-30'N 141°-37'E.
1939K Surfaced and headed south to commence patrol below SHIRYU SAKI on
        southwest and northeast line. This sector south of SHIRYU SAKI seems
        to be our best bet. We figure that anything coming up for TSUGARU
        Strait will be trying to arrive there in time to go through in day-
        light.

-5-

— page 283 —
U.S.S. BRILL (SS280) Report of 7th War Patrol
C-O-N-F-I-D-E-N-T-I-A-L

7 April 1945
0130K Radar contact! Bearing 060°T, distance 15,900 yards, came to 055°T
and stationed Radar Tracking Party. Commenced closing target.

0150K Have determined target group to consist of one small and three very
small ships on base course 120°T, speed 8 knots. The escorts are in
a rather open formation in the shape of a rough semicircle running from
targets port beam to about 45° on his starboard bow, all about 4-5,000
yards away from him. For such a small target, there is certainly an
abundance of escorts.

0216K Went to battle stations and started in for target. Have determined his
zig plan to be as follows: 10-4-6-10 minute legs and then repeating
each zig 25° to 35° from base course. Decided to wait for him to
settle down on his 10 minute leg on course 155°T and then go in in
fire on a 100 starboard track.

0243K Sighted target through binoculars at about 4,500 yards, looks like a
small freighter of about 2,500 tons. Am still puzzled why such a
small ship should have so many escorts!

0244K Target due to zig toward, so came to course 085°T and slowed to 10
knots to let gyros come off and range decrease.

0245K Target zigs toward as planned, everything is clicking like a watch, so
with 4° left gyros and torpedo run of 2,100 yards;

0250-25K Fired #6, 4½°L, 6 feet.

0250-35K Fired #5, 4½°L, 6 feet.

0250-45K Fired #4, 4½°L, 6 feet.

0251K Observed all fish to be porpoising, ordered cease firing and came
left to have a try with stern tubes. Changed my mind because of the
small size of the target and the possibility that all depth engines
were out of kilter due to extreme cold.

0257K Heard one end of run explosion, target group zigged away and speeded
up. Decided to track them, make and end around, have a look at all
the torpedoes and go in for a submerged attack. The moon has now
risen and precludes the possibility of another attack before morning
twilight sets in. I should like to see by daylight what makes this
target worth three escorts.

0319K Secured from battle stations, continued tracking target and reloading
torpedoes, forward.

0543K At a range of 13,000 yards in early morning twilight, target sighted
us and challenged with AO followed almost immediately with a salvo
from two 4" guns. Target continued to fire and gave us a zero angle
on the bow.

-6-

— page 284 —
U.S.S. RILLA (SS288) Report of 7th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

7 April 1945
0558K When he made a perfect straddle and exploded another in the air direct-
      ly over the shears, it seemed expedient to dive. Plot and TDC had him
      making 24 knots against our 18. Sent OD and lookouts below.

0600K Submerged and went deep, looking hopefully for a gradient. Bathythermo-
      graph flight even quiver as it went off the card. Rigged for depth
      charge, went to silent running and settled down to keep count of the
      ash cans. Can hear much pinging astern and high speed screws.

0615K Sound reports four sets of screws, three pingers, and what sounds like
      one fathometer. All of them are very deliberate and act as though they
      have done this before.

0637K Seem to be boxed in with a pinger astern and on either bow and a listen-
      er on port quarter.

0740K Apparently satisfied with his setup, in came the escort from the port
      bow and unloaded 18 big ones. All of them were close, but a little
      above us.

0800K Three more, very close.

0900K One more, this one must have been hauled out on a barge from the sound
      of it and the way the boat shuddered and shook. We were at 610 feet.

0930K Believe escorts have lost contact.

1200K Position: 41°-20'N 142°-45'E.

1253K Pinging very faint astern, believe we have lost them. Crew has named
      our opponent "TWO RUN CHARLIE".

1530K Came up for a look, all clear. Secured from depth charge and silent
      running.

1948K Surfaced and headed east to patch up our damage before going in for
      another round. Superstructure rattles and bangs like the fenders on a
      Model T.

2030K Put seas on starboard quarter and slowed to 10 knots. Sent four men
      and one officer on deck to see what could be done to rattles in super-
      structure.

2045K Man Overboard! All Stop! All back full! One of the men on deck report-
      ed that Lt. (jg) F.W. PINSON, USN, who had just come up from super-
      structure forward and was examining a deck locker by the JP sound head
      had lost his balance and gone over the side. Searched the entire area
      and used the electric megaphone but nothing was ever seen or heard. Lt.
      (jg) PINSON was dressed in heavy winter clothing and the water tempera-
      ture was 28°F, so it is doubtful if he could have survived more than
      ten or fifteen minutes under these conditions. Our position was 41°-40'
      N and 144°-52'E.

-7-

— page 285 —
U.S.S. GABRILLA (SS288) Report of 7th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

7 April 1945
-2115K Gave up search and set course for Polar Circuit in accordance with
           directive from ComSubPac. Lt. (jg) PINSON's loss will be keenly felt
           by all hands. He was a fine, likeable officer and a good shipmate.

-8 April 1945
0000K Patrolling along track of northern bound shipping.
0533K Made trim dive and usual search for non-existent gradient.
0620K Surfaced and continued patrol.
1200K Position: 44°-00'N 151°-00'E.
1352K Sighted ice pack bearing 023°T.
1730K Sighted heavy ice pack ahead. 44°-19'N 149°-50'E. Have decided to
           go through ETOROFU KAIKYO, investigate ice and search for possible MARUS.
1820K Ice is heavy. Cannot get through. Believe we may have clawed the star-
           board screw. Ice field stretches from beam to beam and ahead as far as
           can be seen in fading twilight. Ship is taking a beating from the mov-
           ing of the ice. Believe ETOROFU is blocked. We will work along the ice
           pack and try to go through SHIMUSHIRO KAIKYO. The starboard screw thumps
           like a car with a flat tire.

10 April 1945
0000K Patrolling along edge of ice field, looking for an opening to westward.
0527K Made trim dive.
0557K Surfaced and continued patrol.
0934K Sighted SHIMUSHIRO to bearing 335°T, distance 68 miles.
1200K Position: 46°-08'N 152°-15'E.
1400K Commenced patrolling across mouth of SHIMUSHIRO SUIDO about 15 miles off
           shore to await darkness before transiting strait.
1700K Visibility decreased. Started through the strait.
1830K Commenced running through scattered ice floes which became increasingly
           heavier as we progressed through the strait. Slowed to 1/3 speed, the
           maximum speed I deemed safe for passage through this heavy stuff.
2300K Received ComSubPac serial 100133 on ice conditions which convinced me of
           the futility of continuing on. The ice was getting heavier as we went
           along. Reversed course and started out of Straits.

-8-

— page 286 —
U.S.S. GILLA (SS28) Report of 7th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

11 April 1945
0000K Working through SHIMUSHU SUIDO to patrol eastern side of Island Chain.
0500K All clear of ice so came around to the northward to patrol along the
      eastern side of the KURILES. Staying about twelve miles off shore.
0638K Made trim dive.
0648K Surfaced and continued patrol.
0940K Sighted KETOI TO.
1130K SHIMA SHIRYU. about to port 8 miles.
1200K Position: 47°-20'N 153°-48'E.
1800K Wind and sea was increasing from southeast.
2000K Wind and sea have reached gale force. Visibility 0.
2318K HASUMKOTAN TO bearing 006°T, 20 miles. Visibility 0. Wind and sea
      force 7.

12 April 1945
0256K Headed into the wind and sea, making turns for 5 knots and making 2
      knots good on course 150°T.
1200K Position: 48°-48'N 155°-23'E. Made about 20 miles since 0300 in
      spite of an increase in turns. Ship was laboring like a pack horse.
      There were times on the surface of hard seas and deep troughs that one
      could feel a change in pressure between crest and trough - or so it seems.

13 April 1945
0100K Wind and weather moderated to about force 5 from 200°T. Decided to put
      on speed and head for KETOI SUIDO and patrol on the surface in the
      strait to intercept shipping that might come up either side of the
      island.
0641K Submerged for trim dive.
0708K Surfaced and continued patrol.
0750K Radar contact on KETOI TO.
0948K Sighted KETOI TO 250°T, distance 10 miles. Decided to go on into
      OHOTSK SEA to investigate shipping routes and to locate accurately
      the position of the ice field.
1148K Cleared KETOI SUIDO, commenced patrolling to northwest at 14 knots.
1200K Position: 47°-42'N 152°-25'E.
1352K Sighted heavy ice floes running from 284°T to 035°T. Slowed to 10 knots.

-9-

— page 287 —
U.S.S. CABRILLA (SS288) Report of 7th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

13 april 1945
1352K and commenced running along the ice looking for an opening to the
northwest. Ice appeared to be about four feet thick as an average,
although there were some small bergs about forty to fifty feet high
and covered with snow. Air and injection temperature 28°F. Ice
stretched as far as we could see. Continued looking for a lead like a
cat looking for a rat hole.

1600K Gave up trying to get through ice. Now faced with the small problem of
how to get out. Ice is moving southeast at about 2 knots.

1716K Cleared the ice and headed back for KETOI SUIDO where we could cover
both sides of the islands as we had previously planned. Our plans
change from floe to floe in this area.

14 april 1945
0000K Patrolling northwest and southeast through KETOI SUIDO.

0400K Headed down coast of SHIMUSHIRU TO to patrol submerged close inshore
in case any MARUS were being routed close to the beach.

0449K Dove and commenced patrolling to the southward on the West Coast of
SHIMUSHIRU about 3 miles off the beach.

1200K Position: 42°-27'N 152°-23'E.

1940K Surfaced after a day of fruitless search. Headed out to check position
of ice. Am becoming more and more certain the Japs have gone into
hibernation.

15 april 1945
0000K Ice had moved in about twenty miles and was packed even more solidly
than it was twenty-four hours previously. KITA URUPPU SUIDO was
choked with floes which were moving at about 2½ knots. A merchant
ship could possibly have gotten through this stuff, but I did not con-
sider it feasible to take Cabrilla through after our earlier experi-
ence. Came around and headed for KETOI SUIDO in order to be in posi-
tion to patrol the Pacific side of KITA SUIDO.

0257K Completed passage through KETOI SUIDO heading down for southern tip of
SHIMUSHIRU.

0455K Dove to close the beach and check on location of possible radar.

0745K Visibility decreased to 14,000 yards. Came to course 125°T to open
out from beach before surfacing.

0947K Surfaced and continued patrol about twelve miles off the beach.

1200K Position: 46°-40'N 151°-10'E.

-10-

— page 288 —
U.S.S. CARP (SS288) Report of 7th War Pat.
C-O-N-F-I-D-E-N-T-I-A-L

15 April 1945
1315K Sighted ice pack moving seaward through KIT. URUPPU SUIDO. Ice was
      solid from SHIMUSHIRU TO URUPPU TO about 15 miles off shore, moving
      southeast at about 2 knots. Decided to patrol edge of ice between
      SHIMUSHIRU and URUPPU the rest of the afternoon and night. An attack
      of any kind would be impossible in the ice.

16 April 1945
0300K Heavy fog and rapid movement of ice unduly restricted mobility in this
      vicinity. Started searching to the south and east along the possible
      tracks of enemy shipping headed to or from HOKKAIDO so as to avoid ice.

1200K Position: 44°-40'N 150°-32'E.

1500K Heavy snow squall and low visibility which continued throughout the
      night.

17 April 1945
0400K Continued surface patrol along possible shipping track. Weather mod-
      erated with force 3 easterly breeze and unlimited visibility. Every-
      one began to feel warm again. Air and injection temperature 35°F.

1027K Submerged for trim dive and to sneak up on the elusive gradient; how-
      ever, the bathythermograph looked blank and drew a straight line.

1200K Position: 43°-12'N 146°-59'E.

1630K Came to 235°T to head in for ERIMO SAKI on HOKKAIDO to see if perhaps
      the Sunfish was tossing the little ones back.

2342K Interference on SJ radar, bearing 251°T. Steadied on bearing and went
      ahead full speed.

18 April 1945
0000K Headed for radar interference. It appeared to be drawing to the north
      and west very rapidly. Tried keying our SJ with no success. If it
      were not for the slow sweep rate of 1 RPM, I would have been convinced
      that it was another SJ. I suspected that it might be a Jap.

0032K Radar interference faded out, leaving us up in the air with a boat full
      of explanations from the experts.

0052K Slowed and lowered sound head to check against any possible skulldug-
      gery by another member of the underwater fraternity. All clear on
      sound, so continued at standard speed down the last true bearing of
      the interference.

0625K Radar contact with ERIMO SAKI at 20 miles.

0647K Saturation APR contact on land based radar on ERIMO SAKI (See sect. U).

0648K With land in sight dove and commenced submerged patrol approximately
      14 miles off ERIMO SAKI.

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U.S.S. GILL (SS28) Report of 7th War Patrol.
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18 April 1945
0905K Commenced hearing series of underwater explosions which sounded very
        much like underwater volcanic activity or very large depth charge
        noises quite far away. These noises continued throughout the day.

1058K Sighted smoke on horizon 063°T.

1100K Came to normal approach course and went to battle stations.

1107K Finally got a look at our prospective victim - a coal burning trawler
        about 110 feet long periodically belching great clouds of black smoke.
        Looks like bait.

1115K Determined targets speed to be about eight knots, holding steady on
        course 255°T. Decided he might be a decoy for something bigger coming
        through later.

1150K Secured from battle stations and continued patrol.

1200K Position: 41°-50'N 143°-35'E.

1708K Picked up echo ranging on JK bearing 105°T, so went ahead 2/3 and came
        to course 200°T, closing in sight with 12½ feet of scope. Visibility
        was limited due to heavy overcast and light drizzle of rain.

1740K Echo ranging coming in very loud. Nothing in sight either visual or
        by ST radar.

1757K Sighted target through mist, sending a message by search light-hoped
        it did not concern us.

1758K Manned battle stations and rigged for silent running.

1804K Sighted second target bearing 136°T with about a fifty starboard angle
        on the bow, range about 5,000 yards. Finally made out the pinger to be
        a sea struck or something very similar, worth two torpedoes.

1806K Identified the second target as an engine aft freighter of about
        3-4,000 tons, very similar to the T.G.H.RU on pg. 266 of ONI 208J.

1810K Targets on course 305°T, speed 7½ knots. TDC checking with ST ranges.

1819K Fired two torpedoes at the escort set on four feet. Gyros were 43
        right for a 108 starboard track. Torpedo run 3,000 yards.

1820K Shifted set up to target #2 and at

1820-35-45-55 and 1821-06 fired tubes 3,4,5, & 6, depth set six feet. 22 right
        gyros for a 92 starboard track. Torpedo run 2,800 yards.

1821K Boat started sinking with a 12° up angle. Forward torpedo room reported

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U.S.S. CHILL (SS288) Report of 7th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

18 April 1945
1821K bilges flooded due to sticky poppets. Diving officer requested more
      speed. We were already making standard so went all ahead full and
      finally stopped at 635 feet with a 14° up angle.

1824K Heard one good hit which was exactly right for #5 torpedo. After tor-
      pedo room reported two explosions but no one in the conning tower
      could be sure of more than one.

1827K Escort dropped eight depth charges and milled around in the vicinity
      of the target and torpedo collision. At no time did he appear to have
      contact or to have any idea where we were.

1837K Able to hold the boat at 100 turns. Started up for a look, pumping
      every foot of the way.

1916K At periscope depth. Nothing visible in direction of pinging, visi-
      bility about 2,500 yards due to haze and fact that sun had just
      set. Could pick up nothing on ST. Target had either sunk or was hard
      aground in a damaged condition. The actions of the escort led
      me to believe that the target was in a bad way.

2000K Finally got all the bilges pumped and boat in trim.

2020K Surfaced on course 080°T to get clear of radar on ERIMO SAKI while
      we decided to patrol along the reverse of target's
      track on the chance that something else might be coming along the same
      line and at the same time get back to our own area.

19 April 1945
0000K Patrolling on surface along probable track of shipping to or from the
      KURILE Group. Visibility about zero due to heavy fog.

1200K Position: 42°-31'N 147°-13'E.

1400K Wind freshened from SE and fog thickened by occasional rain squalls.
      These conditions prevailed throughout the day and night.

20 April 1945
0237K Radar contact on HITOKAPPU Y.M., ETOROFU SHIM. bearing 333°T, distance
      25 miles.

0331K Searched HITOKAPPU YM by radar, maximum range of 15,000 yards and
      found nothing, so decided to patrol about 8-10,000 yards off the beach.
      Visibility is zero due to fog and rain.

0440K Submerged for trim dive.

0502K Surfaced and continued patrolling northward along the coast of ETOROFU
      in dense fog.

1200K Position: 45°-14'N 148°-44'E. Barometer had been dropping steadily
      and wind had increased to about force 6, looked like we were in for a
      bad blow.

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U.S.S. O'NEILL (SS283) Report of 7th Patrol.
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20 April 1945
1814K Wind and weather triumphed again, headed out to sea on 160°T at about
      2 knots, wind and sea force 8.
2300K Wind started to decrease and barometer started to rise. Storm passed
      almost as quickly as it started. Headed back toward URUPPU TO to
      patrol along its coast to see what can be found.

21 April 1945
0200K Patrolling along coast of URUPPU TO. Wind and weather moderated to
      about force 3, with unlimited visibility.
0436K Dove to conduct submerged patrol off URUPPU TO due to unlimited visi-
      bility.
1200K Position: 45°-45'N 150°-27'E.
1545K Visibility decreased so decided to surface.
1558K Surfaced and continued to patrol off URUPPU TO.
2000K Decided to patrol across entrance of KITA URUPPU SUIDO, drift ice is
      too heavy to attempt a transit.

22 April 1945
0000K Patrolling across mouth of KITA URUPPU SUIDO.
0459K Made trim dive on course 180°T.
0515K Surfaced and continued patrol.
0625K Volcano on CHIRINHOI To bearing 326°T, 30 miles, heaved up great clouds
      of smoke and steam which succeeded in melting much of the ice and snow
      around the peak. Very interesting.
1222K Sighted two ships dimly visible through surface haze bearing 352°T
      about 14-15,000 yards. Commenced tracking visually. Radar out of com-
      mission. Experts working frantically and muttering under their breath.
1258K Determined target group to be on course 190°T, speed 7½-8 knots. De-
      cided to parallel them till radar is back in commission. Visibility
      was decreasing rapidly. To attempt a submerged approach would have
      been rather a dubious affair. We were able to track target by his echo
      ranging which he was using with great enthusiasm.
1320K Visibility zero. Continuing to track target by sound, they are on a
      steady course of 190°T, speed 7½-8 knots.
1615K Temporary repairs effected to ST, visibility zero. ST has contact at
      12,000 yards.
1700K Completed temporary repairs to SJ radar, visibility still zero, decided

-14-

— page 292 —
U.S.S. CABRILLA (SS288) Report of 7th War Patrol.
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22 April 1945
1700K So commenced pulling ahead slowly on a
converging course to close track and to find out maximum range of SJ.

1740K SJ radar made contact with target group at 7,500 yards, so manned
battle stations and started in. With such accurate data on target
groups course and speed, decided to close track to about 900-1,000
yards, stop, and let him close us. Visibility was zero and we had
no indications that he had radar. Secured engines for sake of quietness.

1811K When 800 yards from target's track, stopped and swung left slowly
to a 90 port track, intending to fire three torpedoes set at 7 feet,
from the stern tubes at the largest target and one set at 6 feet, at the
ing and smallest target. The escort appeared to be keeping station
1,200 yards off the target's port quarter. This seemed like a dream
come true.

1814K With a torpedo run of 3,800 yards and everything checking, our dream
became a nightmare. For no good reason the escort headed directly for
us and closed to 2,800 yards, coming in fast.

1815K Put four engines on the line and commenced opening out at full power,
range to escort 2,300 yards, holding steady, visibility still zero.

1826K Managed to gain about 400 yards, range to escort 2,870 yards, he was
a little on our port quarter, making about 15 knots.

1828K Target commenced firing short range battle practice, using Cabrilla for
target. All salvos off slightly in range and deflection. We could
not see the splashes, but could hear them bursting off to port. Sent
lookouts below.

1843K After expending sixteen rounds of 3 or 4 inch ammunition, escort se-
cured from battle practice and concentrated on tracking, range was now
6,300 yards. Cabrilla was jumping like a young colt from the effects
of our damaged starboard screw but nevertheless clocking 18 knots.

1852K Ran out of fog into an area of unlimited visibility. O.O.D. expressed
my feelings exactly when he remarked: "Captain, I feel as though I
were at a full dress party and suddenly found I had forgotten my
trousers." Range was now 7,300 yards, but sun had set and twilight
visibility was very uncertain.

1900K Lost contact, so came to 090°T to regain contact. Believed he had
some form of radar despite the fact we had no indications of it during
the approach.

1935K Made SJ contact with target bearing 012°T, 9,160 yards. (SJ out of
commission, experts hard at work) Stopped and tried to figure out
movements of target. Range closed to 8,000 yards by ST.

1940K Came left to 200°T to commence tracking target. ST had only one target.

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U.S.S. CAVALLA (SS288) Report of 7th War Patrol.
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22 April 1945
1940K and sound had echo ranging on some bearing. If that was the way
the escort was trying to regain contact with his convoy. Visibility
has settled to about 5-6,000 yards with a bright moon.

1955K Target speeded up to 14 knots and commenced closing so we increased
speed accordingly.

2002K Range commenced opening rapidly; stopped and turned toward him again.
Plot had him circling at 12 knots. Decided to close him again.

2018K Closed range to 10,500 yards by ST and bearing 020°T by sound bearings.
on his echo ranging.

2025K Target stopped circling and headed for us again when we had closed
range to 8,800 yards. Convinced he has radar capable of picking us
up at 9-10,000 yards, because as soon as we closed to that range he
headed towards us and speeded up. This was quite disconcerting and
perplexing because our SJ was out for at least the next 14 hours.
The maximum range on our ST on this fellow is 10,500 yards. Continued
tracking him, hoping that he would lead us back to the golden fleece.

2135K Tried for an hour and ten minutes to close target undetected and to
get him between us and the moon. He managed to hold his position,
habitually giving us a zero angle and starting to close at 13-14
knots when ever we got within 8,200 yards. Began to wonder who was
tracking who. Continued tracking.

2330K ST had three contacts which were making a sweep which were as follows: 250°T,
10,000 yards; 340°T, 9,000 yards; and 040°T, 9,000 yards. Plotted all
three of them on course which indicated that they more or less had us
boxed in. Decided to open out to the north and then to the east.

2346K Lost radar contact on all targets, plot, at the last, had them all on
course 190°T at 12½ knots. Opened out to the east about ten miles and
then intended to cruise south on a track parallel to target until we
had the SJ back in commission. The ST was now out in order to work
on the SJ. Visibility was down to 1,500 to 2,000 yards.

23 April 1945
0100K Patrolling south on course 190°T parallel to assumed track of target
group while effecting repairs to radar. Visibility zero.

0436K Submerged for trim dive.

0452K Surfaced and continued patrol. ST temporarily back in commission.

1200K Position: 44-07'N 151-40'E.

1521K SJ radar back in commission. (See Section M for details) Visibility
still zero.

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U.S.S. CABRILLA (SS288) Report of 7th War Patrol.
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24 April 1945
0000K Changed course to 025°T and commenced patrolling along the reverse
 of the assumed track of last night's contact.

0446K Submerged for trim dive. Gave up hope of finding a gradient.

0503K Surfaced and continued patrol in usual dense fog and overcast.

1200K Position: 44°-53'N 150°-43'E.

1410K Manned all deck guns and fired five rounds from all of them to keep
 in trim.

1953K Made radar contact on SHIMUSHIRU TO bearing 005°T, at a range of 55
 miles, restoring our faith in the SJ.

2245K SJ contact on CHIRINHOI TO bearing 282°T, 45 miles. Decided to try to
 transit KIT. URUPPU SUIDO to patrol the western entrance if the ice
 would permit.

25 April 1945
0053K Transitting KIT. URUPPU SUIDO. Began to encounter quite a bit of
 heavy ice, visibility zero as usual.

0200K Entered the OKHOTSK SEA and promptly ran into an area of unlimited
 visibility and an ice field extending as far as the eye could see.
 Radar reports ice is solid out to 20,000 yards which is its extreme
 range for heavy ice.

0424K Gave idea of patrolling the western approach to KIT. SUIDO and headed
 back for the eastern side where we would be clear of ice. Would
 patrol east and west across entrance for the day. Visibility shut
 down to zero again.

0430K All clear of ice. Visibility still zero.

0612K Submerged for trim dive.

0640K Surfaced and continued surface patrol on course 220°T and 040°T.

1200K Position: 46°-12'N 151°-36'E.

1240K Sighted two ships through high scope bearing 231°T distance 16 miles,
 with a large starboard angle on the bow. Stationed tracking party.

1415K Plot and TDC had target on course 300°T, speed 12½ knots. He was head-
 ing for MINAMI URUPPU SUIDO which was 32 miles away. We were 2° abaft
 his beam and to make an end around before he got to the straits and
 ice fields would have been impossible. Decided to go through KETOI
 SUIDO and patrol around PARAMUSHIRO. Changed course to 030°T and
 went ahead 15 knots, in order to arrive well ahead
 of him.

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U.S.S. CHILL. (SS283) Report of 7th War Patrol
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25 April 1945
1735K Pit log sword arm was found to be bent, probably from ice. Dropped it
        clean, secured the sea valve, and put a blank over the packing gland.
        Will finish the patrol on the dummy log.

200K    Made radar contact on KETOI TO bearing 010°T, 40 miles.

2252K   Commenced passage of KETOI KAIKYO.

2347K   Completed passage of KETOI KAIKYO.

26 April 1945
0000K   Patrolling northward along probable track of shipping bound to and
        from PARAMUSHIRO.

0434K   Submerged for trim dive.

0442K   Surfaced and continued patrol.

0532K   Radar contact on CHIRIKOTAN TO, 060°T, 35 miles.

1200K   Position: 49°-42'N 152°-48'E.

1430K   Visibility decreased to 1,500 yards due to fog and occasional snow.

1546K   Visibility increased to unlimited.

1800K   Commenced patrolling across assumed track of shipping to or from
        PARAMUSHIRO which might be routed north of KURILE TO. Continued this
        patrol throughout the night.

27 April 1945
0230K   Sighted white light coming over the horizon and radar got contact at
        same time. Range 17, 000 yards, bearing 075°T.

0250K   Closed target to 8,000 yards to remove any doubt that he was Russian.
        He had every light that would burn burning, and made a rather impres-
        sive sight. Lookouts remarked that it was the first time they had
        ever seen a lighted ship underway.

0310K   Came to 095°T to close the approaches of KURILE TO and PARAMUSHIRO.
        Visibility suddenly decreased to zero.

0407K   Submerged for trim dive.

0416K   Surfaced and continued patrol.

0548K   Radar contact on HUROTSU SAKI, 50 miles, bearing 124°T.

0622K   Contact on KURILE TO bearing 084°T, 50 miles.

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U.S.S. CABRILLA (SS288) Report of 7th War Patrol.
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27 April 1945
0645K Emerged from heavy fog into an area of unlimited visibility and a
        glassy sea. P.R.MUSHIRU and KURIJO plainly visible. The heavy over-
        cast acted as a perfect background for every contour of the land to be
        visible for a distance of forty miles.
0700K Visibility shut in as suddenly as it had lifted and continued through-
        out the day.
1200K Position: 51°-05'N 153°-58'E.
1600K Decided to patrol south along assumed track of shipping.

28 April 1945
0000K Patrolling south on course 211°T.
0414K Submerged for trim dive.
0425K Surfaced and continued patrol.
0500K Came left to 137°T to head in for CHIRIKOTAN TO in order to get a fix
        by radar. Visibility is still zero.
0839K SJ contact on CHIRIKOTAN TO, 127°T, distance 35 miles.
0948K Came right to 270°T to get back on what we assume to be track of ship-
        ping.
1200K Position: 49°-08'N 152°-28'E.
1523K Came to course 200°T and continued south. Visibility increased to un-
        limited and temperature has risen to 39°F.
1836K Temperature dropped to 33°F (Normal) and snow started falling.
2340K Ran into heavy ice field, so commenced patrolling NW and SE in hopes
        that we might intercept something coming through the ice.

29 April 1945
0000K Patrolling NW and SE across assumed track of shipping.
0412K Submerged for trim dive.
0433K Surfaced and continued patrol.
1200K Position: 48°-18'N 150°-39'E.
1237K Came to course 120°T and headed for KETOI KIKYO to patrol eastern
        side of chain for awhile.
1808K SJ contact on KETOI TO bearing 131°T, 35 miles.

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U.S.S. KILLIFISH (SS288) Report of 7th War Patrol.
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29 April 1945
1830K       SJ contact on SHIMUSHU TO bearing 161°T, 40 miles.
2154K       Commenced transit of KETOI KAIKYO.
2305K       Completed transit of KETOI KAIKYO and commenced patrolling on course
            140°T.

30 April 1945
0000K       Patrolling on course 140°T. Wind and sea force 5-6, visibility zero.
0823K       Submerged for trim dive.
0840K       Surfaced and continued patrol on course 196°T. Weather conditions re-
            mained the same.
1200K       Position: 45°-47'N 153°-48'E.
1300K       Commenced a retiring search to the north along assumed track of MATSUWA
            bound shipping. This was continued throughout the day and night.

1 May 1945
0000K       Headed northwest to patrol off approaches to MATSUWA TO.
1200K       Position: 46°-58'N 153°-56'E.
1230K       Sighted MATSUWA TO, 15 miles and commenced patrolling off Pacific
            approaches. Continued this throughout the day and evening.

2 May 1945
0000K       Came to course 210°T and headed down the eastern side of chain for
            KETOI SUIDO to be in position to intercept any shipping hugging the
            coast and to test fire our Mk. 18's on MINAMI JIMA. Visibility de-
            creased to zero with much snow and rain. Barometer is falling rapidly
            and wind is rising.
0730K       Wind and sea increasing from NE, so decided to head in for KURET SAKI
            and to do our test firing before the weather got out of
            control.
1030K       Manned battle stations and loaded 20mm and 40mm guns, flooded down and
            closed to 1,500 yards. Visibility is 4,000 yards maximum, conditions
            were ideal. We were in the lee of the island and the current was
            negligible.
1040K       Commenced maneuvering at various speed and various courses to conduct
            test firing. (This is covered in a separate report.)
1200K       Position: 47°-2'N 152°-50'E.
1215K       Completed test firing, came to course 140°T. Secured from battle
            stations.

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U.S.S. BRILL (SS28) Report of 7th War Patrol.
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2 May 1945
1300K Completed reload of remaining torpedoes and continued surface patrol
      on course 140°T.
1700K Commenced transmitting Gabrilla "First" to ComSubPac, giving results of
      patrol and test firing of Mk 18 torpedoes.
2000K Set course for Midway, T.H. in compliance with Operations Order.

3 May 1945
      Enroute Midway conducting training dives and general drills enroute.
1200L Position: 44°-39'N 157°-18'E.

4 May 1945
      Enroute Midway conducting training dives and general drills enroute.
1200M Position: 40°-53'N 161°-22'E.

5 May 1945
      Enroute Midway conducting training dives and general drills enroute.
0041M Radar contact, bearing 180°T, distance 8,300 yards. Exchanged calls
      with U.S.S. STERLET (SS392).
1200M Position: 36°-02'N 165°-53'E.

6 May 1945
      Enroute Midway conducting training dives and general drills enroute.
1200N Position: 31°-18'N 170°-53'E.

7 May 1945
      Enroute Midway conducting training dives and general drills enroute.
1200N Position: 29°-25'N 177°-10'E.
2400N Crossed International Date Line. Repeated 7 May 1945

7 May 1945
      Enroute Midway
0535Y Rendezvous with plane escorts.
0839Y Moored starboard side to Berth S-7, Midway, T.H.

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(C) WEATHER
          The weather conditions encountered adhered closely to, those described
in the Japn Pilot. Average temperature was 31°F. Reduced visibility of
4-5, 000 yards as an average together with rain, sleet or snow was encount-
ered twenty-three (23) of the thirty-one days spent in the Sea.
          Ice conditions agreed with those in the Japn Pilot for a cold, hard
winter.

(D) TIDAL INFORMATION
          Currents agreed with those given on charts within 0.5 knots plus or minus.

(E) NAVIGATIONAL AIDS
          On the third, fourth and fifth of April 1945, SHIRYA SAKI Light, ESHAN
SAKI Light were observed to be burning with normal characteristics.
          Celestial navigation was impossible during twenty-three (23) days in the
area. Radar ranges and bearings on the prominent peaks in the KURILE Islands
made navigation in that area comparatively simple.

(F) SHIP CONTACTS
No. Date Time Lat.             Type             Range Course How         Remarks
          Long.                                        Speed  Contacted

1. 0830K 41°-22'N 2 Trawlers   30000  180T   P (Subm) Small-hugging coast
   4-6-45 141°-28'E                               5 kt.            1000 yd. off beach.

2. 1010  41°-22'N 14 Trawlers  18000  07.5 kt. P (Subm) Small-hugging coast
   4-6-45 141°-28'E                               180T, 8 kt.      1000 yd. off beach.

3. 0130K 41°-04'N 3 Escorts    11000  140T   Radar    Attacked - torpedoes
   4-7-45 142°-15'E 1 small AK                   8 kt.            ran erratic.

4. 1058K 41°-51'N XPC (Sho-    10000  260T   P (Subm) Too small - believed
   4-18-45 143°-37'E nan Maru #6)                 8 kt.            to be a decoy.

5. 1708K 41°-53'N Sea Truck    12000  185T   S (JK)   Attacked.
   4-18-45 143°-39'E Mod. AK                    8 kt.

6. 1222K 46°-01'N 1 Escort     25000  185T   P (Surf) Attempted attack
   4-22-45 151°-25'E 1 Und. Ship                  8 kt.            Detected.

7. 1403K 46°-08'N 1 PF         30000  310T   P (Surf) Did not attack - too
   4-25-45 151°-20'E 1 Und. Ship                  14 kt.           close to ice fields.
                                                                   And around impossible.

8. 0230K 50°-51'N 1 AK         18000  235T   Visual   Identified by lights
   4-27-45 153°-05'E Russian                    12 kt.           and markings.

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(G) AIRCRAFT CONTACTS
None.

(H) ATTACK DATA
U.S.S. CABRILLA TORPEDO ATTACK NUMBER ONE PATROL NUMBER SEVEN
Time 0250K. Date 7 April 1945 Latitude 41°-12'N Longitude 142°-30'E.

TARGET DATA DAMAGE INFLICTED
Ship(s) Sunk - None.
Ship(s) Damaged or probably sunk - None - AK - 2,500 tons.

Target Draft - - - Course 155°T Speed 8.5 knots Range 2,000 yards.

OWN SHIP DATA
Speed 11 kts. Course 080°T Depth - Surface Angle 0.

FIRE CONTROL AND TORPEDO DATA
Target consisted of a small merchantman with three escorts. One
escort was patrolling 1,000 yards on port bow of target and another on the
starboard bow. The third escort was patrolling on the port beam from 3,000-
6,000 yards from the target. Target was zigging on base course 125°T, making
a speed of 8.5 knots. Approach was made from the starboard beam. The sea was
astern, state two, with a light swell. Radar ranges and bearings were used
throughout. Three torpedoes were fired from the bow tubes, depth set 6 feet,
100 starboard track, torpedo run 2,200 yards, torpedo speed corrected for
electric eye temperature of 45°F. All torpedoes were seen and heard to broach.
Five minutes after firing the first torpedo, target was tracked to take a 90° zig to the
and increase speed to 11 knots. Evasion was made on the surface astern of the
target group. Only one end of run explosion was heard, 6 minutes and 50 sec-
onds after firing the first torpedo.

-23-

— page 301 —
U.S.S. CABRILLA (SS288) Report of 7th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

                                        TORPEDO ATTACK NUMBER ONE

Tubes Fired                     6               5               4
Track Angle                     100 S           103 S           102 S
Gyro Angle                      41° R           41° R           41° R
Power                           27.2            27.2            27.2
Hit or Miss                     Miss            Miss            Miss
Erratic                         Yes             Yes             Yes
Mark Torpedo                    18-2            18-2            18-2
Serial Number                   99313           99322           99281
Actuation Set                   Contact         Contact         Contact
Actuation Actual                Miss            Miss            Miss
Mark Warhead                    18-2            18-2            18-2
Serial Number                   5677            5678            5621
Explosive                       TPX             TPX             TPX
Firing Interval                 --              15 sec.         10 sec.
Type Spread                     0°              1° R            1° L
Sea Condition                   2               2               2
Overhaul Activity               Submarine Base, Pearl Harbor, T.H.
Remarks: Temperature: Electrolyte 44°F Injection 33°F.
         Each torpedo was seen and heard from the bridge to broach. The cause for
         this has not been determined. Steering and depth rudders were worked out by hand
         every 2 days previous to firing. All torpedoes had the depth spring adjustment
         screw stop installed.

— page 302 —
U.S.S. GATO (SS288) Report of 7th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

TORPEDO ATTACK NUMBER TWO (Con't.)

Target consisted of a medium freighter with one escort patrolling 1,200
yards ahead. Target and escort were zigging between 280°T and 310°T. ST ranges
were taken one minute prior to firing - range to escort 3,000 yards, target
3,400 yards. Two torpedoes were fired to hit the escort on course 310°T, speed
7.5 knots, torpedo run 3,000 yards, 110 starboard track, depth set 4 feet. Four
torpedoes were then fired at the target on course 305°T, speed 7.5 knots, torpedo
run 2,800 yards, 95 starboard track, depth set 6 feet. Periscope bearings were
used for first four torpedoes. Depth control was lost and the last two torpedoes
were fired on generalized bearings. One explosion was heard which was timed cor-
rectly for a hit on the freighter with #5 torpedo.

| Tube Fired | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|
| Track Angle | 108 S | 109 S | 92 S | 91 S | 91 S | 95 S |
| Gyro Angle | 43° R | 44° R | 22° R | 22° R | 21° R | 25° R |
| Power | 26.5 | 26.5 | 27.0 | 27.0 | 27.0 | 27.0 |
| Hit or Miss | Miss | Miss | Miss | Miss | Hit | Miss |
| Erratic | No | No | No | No | No | No |
| Mark Torpedo | 18-2 | 18-2 | 18-2 | 18-2 | 18-2 | 18-2 |
| Serial Number | 99329 | 99340 | 99230 | 99374 | 99371 | 99402 |
| Actuation Set | Contact | Contact | Contact | Contact | Contact | Contact |
| Actuation Actual | Miss | Miss | Miss | Miss | Contact | Miss |
| Mark Warhead | 18-2 | 18-2 | 18-2 | 18-2 | 18-2 | 18-2 |
| Serial Number | 5693 | 5660 | 5672 | 5638 | 5717 | 5685 |
| Explosive | TPX | TPX | TPX | TPX | TPX | TPX |
| Firing Interval | -- | 17 sec. | 15 sec. | 18 sec. | 10 sec. | 8 sec. |
| Type Spread | 0 | 0 | 1° R | 1° L | 1° L | 1° R |
| Sea Conditions | 2 | 2 | 2 | 2 | 2 | 2 |
| Overhaul Activity | Submarine Base, Pearl Harbor, T.H. |
| Remarks: | Temperatures: Electrolyte 45°F Injection 32°F. |

(I) MINES
None.

(J) ANTISUBMARINE MEASURES AND EVASION TACTICS
No new anti-submarine measures were encountered except that the charges
used in the counter attack seemed to be set deeper and were larger.
Evasion tactics consisted of deep submergence and keeping stern pointed
toward attack group.

(K) MAJOR DEFECTS AND DAMAGE
Hatches On dives following our prolonged deep submergence during depth
charge attack on 7 April, all deck hatches, gun access door, and torpedo loading
hatches leaked excessively. On inspection, all gaskets were found to have re-
ceded, leaving only metal-to-metal seats. On installation, during last major
overhaul of this vessel, only 1/16" protrusion of the gasket above the seat was
allowed. Insufficient protrusion from the seat or possibly defective gasket
material resulted in flooding each hatch on dives. Fortunately all lower hat-
ches remained watertight and hatches were drained each night on surfacing. Dur-
ing coming refit all T type gaskets will be replaced as necessary, allowing 1/8"

-25-

— page 303 —
U.S.S. CABILL (SS285) Report of 7th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

MAJOR DEFECTS AND DAMAGE (Con't.)

protrusion of the gasket above the seat.

Starboard Screw The starboard screw was damaged in attempting to clear drift
ice on 9 April resulting in excessive vibration of the starboard shaft. This
defect will be remedied during coming refit, including checking shaft clearance
to all bearings.

Periscopes Both periscopes were partially cloudy throughout the patrol. The
internal pressure on #2 was bled down from 8.1 lbs per.sq. inch to 4.1 lbs per.
sq. inch affecting only temporary correction. The stadimeter on #2 scope
proved defective and should be renewed. Both periscopes will be pulled and the
optics checked during coming refit.

Drain Line #3 H.E. During the depth charging of 7 April, a crack developed in
the fresh water system on #3 H.E. where the drain line joins the system. This
crack was silver soldered in place by ship's force but will have to be repaired
during the coming refit.

Lube Oil System A crack was sprung in the lube oil system, where distant ther-
mometer for taking temperature of lube oil leaving engine enters the system.
The line was removed and silver soldered by ship's force.

Bridge Pelorus The glass of the bridge pelorus was shattered during depth
charge attack on 7 April and to prevent shorting out the system the system was
secured. It appears that redesign of this is necessary.

Bendix Log The Bendix Log sword arm was damaged by drift ice and dropped
through the hull. During this procedure, a pressure was built up in the FTR,
the bent sword arm forced out through the packing gland, and a blank flange in-
stalled over the stuffing box.

Shunt Field, #1 Main Generator #1 Main Generator shunt field opened up during
depth charge attack on 7 April. The open circuit was traced and the break
was temporarily repaired. It is recommended that during refit the field loads
on all generators be silver soldered.

Auxiliary Generator Cables running from the auxiliary generator to the breaker
were salted out due to heavy seas shipped through the ER induction. Repairs
were affected at Midway and drip pan installed under deck plates over commu-
tator end of generator prior to departure for patrol run on 24 March.

TBT Mark V.II During depth charge attack on 7 April the forward TBT (Mk. 8) was
flooded out completely except for the binoculars. The TBT was unserviceable
the remainder of the patrol. The after TBT was unaffected proving defect
of #1 TBT rather than design.

Batteries Excessive battery grounds were developed during the latter part of
the patrol. It is believed that the large amount of condensation in the battery
wells was responsible for this condition. In addition to drying out the battery
wells was responsible for this condition.

-26-

— page 304 —
U.S.S. CILL. (SS288) Report of 7th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

MAJOR DEFECTS AND DAMAGE (Con't.)

well, it is also suggested that the insulation of the strongbacks and bolt rods
be improved so as to prevent a direct path..

(L) RADIO
     There were no radio material casualties during this patrol. Reception was
excellent throughout. Only NPM was copied; the 6,000 KC channel at night and
12,000 KC during the day was used. The jamming by the enemy was very slight
and ineffective. No ComSubPac radio materials were missed.
     Only one transmission was made. NPM was raised immediately on 12,000 KC.
No jamming was present during this transmission. NTF also picked us up during
the transmission.
     No opportunity was had to use the VHF.

(M) RADAR
     (a) The I.F.F. gear and SD-2 radar was not used during the entire patrol.
     (b) PR-1 and SPA-1 were manned continuously when on the surface and were of
value only in indicating presence of enemy shore radar stations. No signals
were received during an attempted surface attack despite the fact that we were
undoubtedly picked up by enemy radar. When an escort vessel closed and fired at
us in a heavy fog. The set was apparently working, therefore the only conclu-
sion is that the enemy was using a frequency higher than 1,000 megacycles which
is the upper limit of the TN-3 tuning unit. Only material casualties were a de-
fective 6J7 tube which caused a 60 cycle hum, a defective banana plug, and a
shorted 2X2 tube. The total time on this set is 1,200 hours.
     (c) SJ-a radar performed satisfactorily except on the one occasion it was
most needed. Contact was made by periscope but fog closed in and ST was used
to get ranges. The SJ was out of commission and was completely untuned. New
crystal and TR tube were installed but it still failed to pick up the targets
beyond 8,000 yards. Work was performed on the SJ for twenty-four hours and the
trouble was finally traced to faulty TR tubes. Four new tubes were installed
before the set would operate satisfactorily. Stops should be taken to insure
good tubes being issued for spare parts. This trouble was particularly illusive
since excellent wave pips were received despite the faulty TR tubes. A neon
tube was used to check the output of the antenna which was found to have poor
radiation. This was the only indication that the equipment was not operating
properly.
     The following material repairs were made:
     2 April - Repaired SJ load switch in main control unit.
     3 April - Replaced 721-A (TR tube)
     5 April - Replaced 717A's in receiver to improve sensitivity. Also re-
               placed crystal and retuned completely.
     6 April - Replaced magnetron (706AY), 813, and Klystron (Shepard Pierce
               706AY had to be used since the first replacement
               double-ended. The magnetrons were replaced due to low output.
               Set completely retuned.
     22 April - Ranges very poor. After trying 4 TR tubes, 721A, found one that
               worked.
     26 April - Replaced jack on coax bringing range mark to PPI.

-27-

— page 305 —
U.S.S. G.BRILL (SS282) Report of 7th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

R.D.R (Con't.)
(d) ST radar: ST was used during a submerged attack and gave satisfactory
results. Using it up to a range of 6,000 yards in poor visibility and then
putting the range into the stadimeter insures the proper determination of the
masthead height of a target. It was also used during an attempted surface
attack in fog when SJ radar was not working properly but the radical bearings
made it of little use.
Very little material trouble was encountered but the drift in tuning was
a problem to overcome. The set was turned on and tuned twice a day. Special
precautions were taken to insure the cleanliness of the wave guide windows in
the periscope well and periscope.

(N) SOUND
Sound conditions were excellent. No gradients were observed down to the
test depth of the ship.
Early in the patrol the QB sound head was put out of commission due to
grounded cables. Hydraulic oil seeped into the shaft, down to the head, then
came up through the rubber insulation of the cable. This leak resulted from
the installation of flax packing instead of a copper gasket.
The JP-1 cable leading from the head to the receiver parted inside the
shaft. To repair this defect, the head had to be removed topside and the
cable spliced.
Good reception was obtained on the JK especially on echo ranging. Making
ten knots, echo ranging was picked up at 10,000 yards (ST range).
At the insistence of the ship's force, the sound training motors were in-
stalled vertically against the bulkhead in the F.T.R. during the recent navy
yard overhaul. This alteration paid dividends when the F.T.R. bilges were
flooded during a submerged attack. The sound training motors were not affected
in the least.

(O) DENSITY LAYERS
No gradients were found during this patrol, although many attempts were
made to find one.

(P) HEALTH, FOOD AND HABITABILITY
Although the boat was generally damp and cold, the heavy winter clothing
provided below decks personnel gave satisfactory protection. There were few
colds among the crew and generally not severe nor persistent. Several men
suffered from chilled hand and feet, but these cases responded readily to
treatment administered by the pharmacist mate.
The Commissary Department prepared excellent menus throughout the entire
patrol. Menus were varied and exceptionally well balanced up to and including
the last night out. Because of the cold temperatures, food loss was excep-
tionally slight.
At no time did any personnel show signs of great discomfort even during
days when air and water temperatures were below freezing. Except in conning
tower, the temperature throughout the boat seldom was below 55°F.

-28-

— page 306 —
U.S.S. GRILL (SS288) Report of 7th Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

(1) PERSONNEL
    (a) Number of men detached after previous patrol                               28
    (b) Number of men on board during patrol                                       75
    (c) Number of men qualified at start of patrol                                 51
    (d) Number of men qualified at end of patrol                                   60
    (e) Number of unqualified men making first patrol                              14

        The prevailing bad weather might have made this patrol most unpleasant.
    However, under the fine able leadership of the Executive Officer, Lieutenant
    J.B. ELLIOTT, Jr., USNR and the Chief-of-the-Boat, W.A. DEVINE, CTN, USN, the
    officers and men performed their duties cheerfully and well under fire and in
    spite of the cold that prevailed. The unqualified men have worked
    hard to qualify, encouraged and taught by enthusiastic officers and petty off-
    icers.

        Among the many officers and men who deserve special mention for their ex-
    cellent work are: Lt.(j.g.) J.F. CALABRESE, USNR, the Electronics Officer; Lt.
    (j.g.) J.W. TALBOTT, USN, the Torpedo Officer, TDC Operator, and Communications
    Officer, after the loss of Lt.(j.g.) P.W. PINSON, USN; F.J. FOWLER, CR, USNR,
    and the radio technicians O.W. MATTHEWS, CRT, USNR, and N.B. BENTLEY, RM1c,
    USNR; W.R. WILLARD, RM2c, USNR, and J.E. NICOLYSEN, RM3c, USNR, for their
    outstanding performance as soundmen; and R.B. KENN, SC1c, USN, for note-
    worthy ability as cook and baker.

(R) MILES STEAMED FUEL USED

        Base to area            3,350.8 miles           46,140 gallons
        In area                 6,927.9 miles           53,485 gallons
        Area to Base            1,950.8 miles           24,665 gallons (estimate)

(S) DURATION

        Days enroute to area            11 days
        Days in area                    31 days
        Days enroute to base            7 days
        Days submerged                  8 days

(T) FACTORS OF ENDURANCE REMAINING

        Torpedoes       Fuel            Provisions      Personnel Factor
        5               4,000 gal.      15 days         15 days

        Limiting factor this patrol FUEL

(U) COMMUNICATIONS, R.D.R. AND SONAR COUNTERMEASURES
        APR picked up many contacts which upon investigation proved to be either
    SJ or ST radar. The frequencies varied from 198 MC to 645 MC.
        The contacts on the following page are listed only once although the
    asterisks** mark contact which were obtained each time the ship came in range
    of the radar station.

-29-

— page 307 —
U.S.S. GULLA (SS288) Report of 7th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

COMMUNICATIONS, RADAR AND SONAR COUNTERMEASURES (Con't.)

| No. | Date | Time GCT | PRF (cps) | Pulse Width | Beam | Rot. Lobe | Switch Signal | Str. of Pulse | Sketch | Remarks                                     |
|-----|------||||------||||||
| 1   | 4-1  | 0541 148 | 1000-1200 | 5-6         | ---  | No        | No            | Strong        | ╱      | Possible shipborne                          |
|-----|------||||------||||||
| 2   | 4-1  | 1656 78  | 500       | 15          | ---  | 4         | No            | Weak          | ┌┐     | Jap land based air search.                  |
|-----|------||||------||||||
| 3*  | 4-2  | 1016 102 | 600       | 19          | 270° | No        | No            | Strong        | ╱‾     | Jap land based air search. Located on SHIRIYA SAKI (HONSHU) |
|-----|------||||------||||||
| 4*  | 4-2  | 1128 145 | 500       | 12          | 300° | No        | No            | Strong        | ╱‾     | Land based air or surface. Located on ERIKO SAKI (HOKKAIDO) |
|-----|------||||------||||||
| 5*  | 4-11 | 0400 152& 105 | 500       | 12½         | ---  | No        | No            | Moderate      | ╱      | Land based air or surface. Located on ERIKO SAKI (HOKKAIDO) |
|-----|------||||------||||||
| 6   | 4-12 | 1415 107 | 500       | 20          | ---  | 1/3       | No            | Moderate      | ╱‾     | Land based air or surface. Located on SHIRUSHIRU TO         |
|-----|------||||------||||||
| 7*  | 4-17 | 0210 103& 155 | 500-1200 | 10          | ---  | 1/3       | No            | Weak          | ╱      | Land based air or surface. Located on URUPPU TO             |
|-----|------||||------||||||
| 8*  | 5-1  | 1010 104 | 500       | 13          | ---  | 4         | No            | Strong        | ╱‾     | Land based air or surface. Located on MATSUMA               |
|-----|------||||------||||||

On 17 April 1220 GCT, strong radar interference was picked up on the SJ-a
receiver scope, but no target pips were received. This interference lasted until
1350 when it disappeared completely. The PRF was between 1350 and 1500 and the
pulse width 1/2 microsec. An attempt was made to exchange recognition signals
but was unsuccessful. The U.S.S. SUNFISH may have been in that vicinity.

-30-

— page 308 —
U.S.S. CABRILLA (SS288) Report of 7th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

(V) REMARKS
The surface attack made on 7 April 1945 and subsequent events somewhat
puzzle the Commanding Officer. He has never known escorts to be so rar in ad-
vance of the convoy nor has he ever seen a small freighter so heavily escort-
ed. When detected on the surface and forced to submerge at dawn, three ships
were searching for us by echo ranging; a fourth set of screws also may have
been heard. Apparently, all of the escorts and possibly the convoy itself,
came over to assist in the destruction of the attack. The rapidity with which
were overtaken and the range and accuracy of the pursuer's armament indicated
that she was a first class combatant vessel with plenty of boiler power avail-
able. These facts, plus the possibility of earlier detection by shore based
radar, could conceivably indicate the Cabrilla bit on a red herring drawn
across her path.

The surface attack attempted on 22 April 1945 in a heavy fog was thwarted
by enemy radar. At 4,000 yards range, Cabrilla was lying to, maneuvering in the
battery. Sound detection was highly improbable. Hereafter the Commanding
Officer intends to release a radar decoy near the target's track. If the
escorts investigate the decoy, the attack will be made submerged, regardless
of visibility. If not, or if necessary sound bearings at the firing point
should yield good results.

Ten Mk. 18 torpedoes were fired against perpendicular cliff on 2 May.
Injection temperature was 33°F. An analysis of the test data reveals that tor-
pedo speeds vary considerably from the predicted values at all ranges. For a
run of 1,200 yards, the torpedo speed varied from 29.76 knots to 29.04 knots -
5% above and 2% below predicted speed. At 2,400 yards the speeds were 3.8% above,
0.7% above and 13% below predicted speeds. At higher ranges, speed and length
of run became erratic. It seems reasonable to assume that in cold water, Mk.
18 torpedoes will run within 5% of predicted speed at run on up to 2,000
yards. For such a run, the speed error would cause a spread of 133 yards be-
tween the slowest and fastest is excessive. The run, to assure satisfactory
performance in cold water, must be still further reduced.

Eleven (11) torpedoes were fired on the surface in the presence of the
truth of six (6) foot suns breached. Depth settings on these eleven to
twelve (12) foot. The torpedoes ran at depth.
of thirteen (13) on fifteen (15) foot had not breached. If previous data
rule for depth setting Mk. 18 torpedoes in areas where injection temperature
is below 35°F, is suggested:

(a) When firing across the sea, double the estimate had ht of the waves
and add two foot to determine minimum depth setting.
(b) When firing into the sea, double the height of the waves and add
four foot.

Except in a calm sea, Mk. 18 torpedoes will not give reliable depth per-
formance set at depths less than ten foot, assuming the test firing data are
valid. At present very few torpedoes, except loaded cargo ships, have draft
greater than 10 foot. In cold water, a hit in anything with a draft less than
10 foot is a matter of luck, dependent upon the chance coincidence of the tor-
pedo being at the top of its trajectory when the point of impact being at
its maximum depth.

-31-

— page 309 —
U.S.S. C.BRILL (SS288) Report of 7th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

REMARKS (Con't.)
Faulty depth performance, erratic speed performance at optimum ranges,
and curtailed length of run of Mk. 18 torpedoes in cold water, are the three
reasons why these torpedoes, according to the information at hand are unsat-
isfactory.

[HANDWRITTEN: -32-]

— page 310 —
F85-242/.16-3
Serial: (013)

C-O-N-F-I-D-E-N-T-I-A-L

FIRST ENDORSEMENT to
U.S.S. CABRILLA. (SS288)
Report of Seventh War Patrol.

From: The Commander Submarine Division TWO HUNDRED FORTY-TWO.
To : The Commander-in-Chief, United States Fleet.
Via : (1) The Commander Submarine Squadron TWENTY-FOUR.
(2) The Commander Submarine Force, Pacific Fleet, administrative.
(3) The Commander-in-Chief, U. S. Pacific Fleet.

Subject: U.S.S. CABRILLA (SS288) - Report of SEVENTH War Patrol.

1. The seventh war patrol of the CABRILLA, with a new Commanding
Officer, Lieutenant Commander H. C. LUERSSEN, U.S.N., was conducted in the Kurile
Island Group and Polar Circuit. It was of forty-nine days duration of which thirty-
one were spent in the area. During the entire period in the area, poor visibility,
cold weather, and ice floes made this an arduous patrol.

2. Only five worthwhile torpedo targets were contacted. One of these
was a properly marked and lighted Russian ship. One other contact consisted of an
unidentified AK with a single escort. Because of the ice fields the CABRILLA was
unable to close for attack. A third contact consisted of another unidentified
AK with a single radar-equipped escort. Later events indicated probably two
attempts of the CABRILLA to gain a surface attack
position were thwarted by this radar-equipped escort, on one occasion being driven
off by gun fire. Subsequent attempts were unsuccessful. Each time the CABRILLA
would start in, the escort would drive her off. Two other contacts resulted in
torpedo attacks:

TORPEDO ATTACK NUMBER 1 (7 April 1945):

A night surface attack on a small unidentified AK, with three
escorts. Three MK 18-2 torpedoes were fired at the AK, range 2,000 yards, 10°
starboard track angle, 4 1/2° left gyro angles, depth set 6 feet. All torpedoes
were seen to breach and miss the target. While making an end around for a sub-
merged daylight attack, the CABRILLA was detected in the early morning twilight,
at a range of 18,000 yards, and subjected to a rather severe depth charging. Only
minor damage resulted.

TORPEDO ATTACK NUMBER 2 (18 April 1945):

A submerged daylight attack on a T.C. MARU type AK with a single
escort. Two MK 18-2 torpedoes were fired at the escort and four MK 18-2's at the
AK. Shortly after firing, depth control was lost, and results were not observed.
However, one good time torpedo was heard in the AK. A short half-hearted depth
charge attack followed with no damage to the CABRILLA.

- 1 -
SUBMARINE DIVISION TWO HUNDRED FORTY-TWO
Care of Fleet Post Office,
San Francisco, California.
9 May 1945.

— page 311 —
FB5-242/.16-3
Serial: (013)
C-O-N-F-I-D-E-N-T-I-A-L

FIRST ENDORSEMENT to
U.S.S. CABRILLA (SS283)
Report of Seventh War Patrol.

Subject: U.S.S. CABRILLA (SS283) - Report of SEVENTH War Patrol.

RECOMMENDED ASSESSMENT:

Damaged - one small AK (EC) (T.G.A. MRU type) - 2,868 tons.

3. The remarks of the Commanding Officer regarding the performance of
the MK 18 torpedoes in cold weather are particularly pertinent. During the last
day in the area a special firing of ten MK 18 torpedoes was conducted. This is
covered in a separate report.

4. The loss of Lieutenant (jg) P. W. PINSON, U.S.N. (file #282869,
signal #14779), overboard on the night of 7 April 1945, while inspecting the
superstructure for damage, following a severe depth charging, is deeply regretted.

5. The CABRILLA arrived from patrol exceptionally clean and in a very
good material condition. The damaged starboard propeller and leaky hatch gaskets
will be corrected. It is expected that refit will be completed in the normal
period. Morale is very high and health excellent.

6. The Commanding Officer, officers and men of the CABRILLA are con-
gratulated upon the completion of an arduous patrol. It is regretted that few
worthwhile torpedo targets were provided for this fighting ship.

J. W. DAVIS.

- 2 -
SUBMARINE DIVISION TWO HUNDRED FORTY-TWO
Care of Fleet Post Office,
San Francisco, California.
9 May 1945.

— page 312 —
FC5-24/A16-3 SUBMARINE SQUADRON TWENTY-FOUR 05/wd
Serial: (099) Care of Fleet Post Office,
San Francisco, California,
10 May 1945
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to
U.S.S. CABRILLA (SS288)
Report of Seventh War Patrol.

From: The Commander Submarine Squadron TWENTY-FOUR.
To : The Commander-in-Chief, United States Fleet.
Via : (1) The Commander Submarine Force, Pacific Fleet,
Administrative Command.
(2) The Commander-in-Chief, U. S. Pacific Fleet.

Subject: U.S.S. CABRILLA (SS288) - Report of SEVENTH War Patrol.

1. Forwarded, concurring in the remarks of Commander Submarine
Division TWO HUNDRED FORTY-TWO.

2. The Commander Submarine Squadron TWENTY-FOUR deeply regrets
the loss of Lieutenant (jg) P. W. PINSON, U.S.N.

3. The Commanding Officer, officers and crew of CABRILLA are
congratulated upon the completion of a long patrol, made arduous by the
rigors of Arctic climate and a dearth of worthwhile targets.

[SIGNATURE: F. W. PENNO]
F. W. PENNO.

— page 313 —
[HANDWRITTEN: F4254]
Gn

FF12-10(A)/A16-3(18)
Serial 01228
CONFIDENTIAL
FROM: The Commander Submarine Force, Pacific Fleet.
TO: The Commander in Chief, United States Fleet.
VIA: The Commander in Chief, U. S. Pacific Fleet.

6 0491
SUBMARINE FORCE, PACIFIC FLEET
Care of Fleet Post Office,
San Francisco, California.
25 May 1945.
NOTE: THIS REPORT WILL BE
DESTROYED PRIOR TO
ENTERING PATROL AREA.

Subject: U.S.S. CABRILLA (SS-289) - Report of Seventh War Patrol
(28 March to 7 May 1945).

1. The seventh war patrol of the CABRILLA, under the command of
Lieutenant-Commander H. C. Laurance, U. S. Navy, was conducted in the areas off
the Kuriles.

2. This arduous patrol was characterized by severe weather. Floating
ice was encountered in various parts of the area. Few contacts were made, out of
which two attacks resulted. On the first attack, torpedoes broached, and the tar-
get maneuvered to avoid. On the second attack, one timed hit was observed, causing
damage to a freighter.

3. The Commander Submarine Force, Pacific Fleet, joins the officers and
men of the CABRILLA in their sorrow over the loss of Lieutenant (jg) P. W. Pinson,
U.S. Navy, who was lost overboard while inspecting damage in superstructure follow-
ing a severe depth charging. The CABRILLA performed tests of the Mark 18 torpedoes
in cold water, obtaining valuable data.

4. Award of Submarine Combat Insignia for this patrol is not
authorized.

5. The Commander Submarine Force, Pacific Fleet, congratulates the
commanding officer, officers, and crew of the CABRILLA for the completion of this
arduous patrol, and hopes she will be favored with better luck next time. The
CABRILLA is credited with having inflicted the following damage upon the enemy:

D A M A G E D
1 - AK (Similar to TAGA MARU) (EC) - 2,868 tons (Attack No. 2)

MERRILL COMSTOCK.

Distribution & authentication
next page.
- 1 -
[STAMP: EXTRA - ORIGINAL]
[STAMP: SORG. - MICRO]
[STAMP: PHOTO LAB - OP-16]
[STAMP: RETURN TO F-4253]

— page 314 —
FF12-10(A)/A16-3(18) SUBMARINE FORCE, PACIFIC FLEET
Serial 01228
                                        Care of Fleet Post Office,
CONFIDENTIAL                            San Francisco, California,
                                        25 May 1945.

THIRD ENDORSEMENT to                    NOTE: THIS REPORT WILL BE
CABRILLA Report of                            DESTROYED PRIOR TO
Seventh War Patrol.                           ENTERING PATROL AREA.

COMSUBPAC PATROL REPORT NO. 764
U.S.S. CABRILLA - SEVENTH WAR PATROL.

Subject:        U.S.S. CABRILLA (SS288) - Report of Seventh War Patrol
                (20 March to 7 May 1945).

DISTRIBUTION:
(Complete Reports)
Cominch                                 (7)
CNO                                     (5)
Cinopac                                 (6)
JICPOA                                  (1)
ADICPOA                                 (1)
Comservpac                              (1)
Cinclant                                (1)
Comsubelant                             (8)
S/M School, FL                          (2)
CO, S/M Base, PH                        (1)
Comsopac                                (2)
Comsowespac                             (1)
Comsubsovespac                          (2)
CTG 71.5                                (2)
Comnorpac                               (2)
Comsubspac                              (3)
ComsubspacAdCond                        (20)
SUSAD, MI                               (2)
ComsubspacSubordcom                     (3)
All Squadron and Div.
  Commanders, Pacific                   (2)
Substrainpac                            (2)
All Submarines, Pacific                 (1)

[SIGNATURE: E. L. Hynes]
E. L. HYNES, 2nd,
Flag Secretary.

— page 315 —
U.S.S. CABRILLA (SS288)
Fleet Post Office,
San Francisco, Calif.,
3 August 1945.

SS288/16-3
Serial (05-45)

DECLASSIFIED

From : The Commanding Officer.
To : The Commander in Chief, United States Fleet.
Via : Official Channels.

Subject: U.S.S. CABRILLA (SS288), Report of War Patrol number EIGHT.

Enclosure: (A) Subject Report.
(B) Track Chart (ComSubPacAd) only.

1. Enclosure (A), covering the Eighth War Patrol of this vessel
conducted in the South China Sea and Java Sea areas during the period 3 June
1945 to 3 August 1945, is forwarded herewith.

H.C. LUERMAN.

DECLASSIFIED ART. 0445, OPNAVINST 5510.1C
BY [HANDWRITTEN: OP-09B9C] DATE [HANDWRITTEN: 5/25/72] [STAMP: DECLASSIFIED]

11 0103

— page 316 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

SS288/A16-3
Serial (02-45)

C-O-N-F-I-D-E-N-T-I-A-L

(A) PROLOGUE

Cabrilla arrived Midway, T.H. on 7 May 1945 from Seventh War Patrol.
A normal refit was conducted by Submarine Division TWO FORTY TWO and the USS
AEGIR. The refit was considered the best yet performed on this vessel.
An excellent and highly beneficial training period under the supervision
of Commander Submarine Division TWO FORTY TWO commenced on 23 May and extended
through 30 May. Loading and final repairs were completed on 2 June and Cabrilla
departed Midway on 3 June for Eighth War Patrol via Saipan.
Lt.(jg) B.T. McLENNAND, U.S. Navy reported aboard for duty on 21 May.

Officers and CPO's on board and total patrols.

OFFICERS                                                Total Patrols**

Lt.Comdr. H.C. LAUERMAN, USN                                  10
Lieut. J.B. ELLIOTT, Jr., DEM, USN                             8
Lieut. W.A. GROSSETTA, USN                                     7
Lieut. J.P. CALABRESE, D, USNR                                 4
Lt.(jg) S.N. DONAHOE, DE, USNR                                 3
Lt.(jg) J.W. TALBOTT, USN                                      5
Lt.(jg) B.R. HEITMAN, D(L), USNR                               4
Lt.(jg) B.T. McLENNAND, USN                                    6
Ensign L.J. GOULET, D(L), USNR                                 2

CPO's
DEVINE, W.A., CTM(AA)T, USN                                    3
ZELAZNICKI, J., CEM(T), USN                                   15
NELSON, W., CMOMM(T), USN                                      4
FOWLER, F.J., CRM(T) V-3, USNR                                 9
STRAHORN, J.N., CMOMM(AA)T V-6, USNR                           7
MATTHEWS, F.O., CRT(AA)T V-6, USNR                             7
WOHL, C.J., CPHM(AA) T V-6, USNR                               2

** Includes CABRILLA 8th War Patrol.

(B) NARRATIVE

3 June 1945
0700(Y) Took departure from Midway in accordance with ComTask Group 17.5
Op Order 18-45, proceeding to SAIPAN.

4 June 1945
Omitted this date.

5-11 June 1945
Enroute SAIPAN conducting training dives and general drills enroute.

11 June 1945
0530(K) Rendezvous with USS SILVERSIDES, USS QUILLBACK and escort USS LCI
1062.

-1-

— page 317 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

11 June 1945
1100(K) Moored port side to in nest of submarines alongside USS ORION (AS18).
        During the 24 hour stay in SAIPAN, ORION arranged for a beer party
        and tour of the Island for the Officers and crew. These services
        were deeply appreciated by all hands.

12 June 1945
1500(K) Took departure from SAIPAN in company with USS SILVERSIDES, USS
        QUILLBACK with USS LCI 1042 acting as escort, in accordance with
        ComTask Group 17.7 Op Order 11-45.
2100(K) Released escort, proceeding in safety land in company with USS
        SILVERSIDES and USS QUILLBACK

13 June 1945
        Enroute to area in company with USS SILVERSIDES and USS QUILLBACK,
        conducting training dives and general drills enroute.
1200(I) Position: Lat. 17°-46'N Long. 143°-16'E.

14 June 1945
0800(I) Bade farewell to USS SILVERSIDES and USS QUILLBACK, proceeding in-
        dependently.
1200(I) Position: Lat. 20°-45'N Long. 138°-38'E.

15 June 1945
        Enroute to patrol conducting training dives and general drills en-
        route.
1200(I) Position: Lat. 20°-39'N Long. 133°-02'E.

16 June 1945
        Enroute to patrol conducting training dives and general drills en-
        route.
1200(I) Position: Lat. 20°-49'N Long. 127°-24'E.

17 June 1945
        Enroute to patrol conducting training dives and general drills en-
        route.
0823(I) Sighted BATAN Island bearing 245° T, distance 32 miles on high scope.
1030(I) Sighted overturned boat, closed to investigate, found it had been
        straffed and burned to water's edge. It had no identification
        marks.
1100(I) Put four engines on line and commenced transit of BATAN Channel.
1200(I) Position: Lat. 20°-33'N Long. 122°-01'E.

-2-

— page 318 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

17 June 1945
1330(I) Completed transit of BATAN Channel, resumed two engine speed.
1800(I) Passed to Op Control of ComTask Force 71, sent Cabrilla Serial #1
          to request patrol assignment.

18 June 1945
0200(I) Received ComTask Force 71 dispatch 171613 of June 1945 giving
          Cabrilla area assignment. Put three engines on line, all ahead
          17 knots.
1100(I) Arrived in assigned area.
1200(I) Position: Lat. 21°-22'N Long. 116°-45'E.

19 June 1945
          Patrolling on station in accordance with ComTask Force 71 dispatch.
1200(I) Position: Lat. 21°-58'N Long. 116°-42'E.

20 June 1945
          Patrolling on station.
1200(I) Position: Lat. 20°-54'N Long. 116°-49'E.

21 June 1945
          Patrolling on station.
1200(I) Position: Lat. 20°-42'N Long. 116°-03'E.

22 June 1945
          Patrolling on station.
1200(I) Position: Lat. 20°-48'N Long. 116°-18'E.

23 June 1945
          Patrolling on station.
1200(I) Position: Lat. 21°-02'N Long. 116°-23'E.

24 June 1945
          Patrolling on station.
1200(I) Position: Lat. 20°-56'N Long. 116°-23'E.

25 June 1945
          Patrolling on station.
1200(I) Position: Lat. 20°-57'N Long. 116°-11'E.

26 June 1945
0000(I) Departed present area to patrol in vicinity of PARACEL Islands.
1200(I) Position: Lat. 20°-15'N Long. 115°-28'E.

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— page 319 —
U.S.S. GABRELLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

27 June 1945
          Patrolling enroute to PARACEL Islands.
1200(I)   Position: Lat. 19°-22'N Long. 113°-56'E.

28 June 1945
          Patrolling enroute to PARACEL Islands.
1200(I)   Position: Lat. 17°-04'N Long. 112°-47'E.
1310(I)   Sighted WOODY Island bearing 252°T, distance 14 miles, commenced
          patrolling across entrance through PARACEL Islands.

29 June 1945
          Patrolling across entrance to channel through PARACEL Islands.
0623(I)   Dove for submerged patrol between WOODY Island and LINCOLN Island.
1200(I)   Position: Lat. 17°-23'N Long. 112°-58'E.
2014(I)   Surfaced and commenced nigh patrol of Pass.

30 June 1945
          Patrolling across entrance to channel through PARACEL Islands.
0635(I)   Dove for submerged patrol between WOODY Island and LINCOLN Island.
1200(I)   Position: Lat. 16°-34'N Long. 112°-22'E.
2018(I)   Surfaced and commenced night patrol of Pass.

1 July 1945
          Patrolling across entrance to channel through PARACEL Islands.
0643(I)   Dove for submerged patrol between WOODY Island and LINCOLN Island.
1200(I)   Position: Lat. 15°-51'N Long. 112°-04'E.
2026(I)   Surfaced and commenced night patrol of Pass.

2 July 1945
          Patrolling across entrance to channel through PARACEL Islands.
0649(I)   Dove for submerged patrol between WOODY Island and LINCOLN Island.
1200(I)   Position: Lat. 15°-12'N Long. 111°-42'E.
2022(I)   Surfaced and commenced night patrol of Pass.

3 July 1945
          Patrolling on surface.
0916(I)   Dove to close WOODY Island.

-4-

— page 320 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

3 July 1945
1200(I) Position: Lat. 16°-43'N Long. 112°-15'E.
1411(I) Battle surfaced off WOODY Island. Did not fire due to fact that
          a French Flag, with a white flag over it, was flying over the block-
          house.
1422(I) After careful scrutiny of the island for any sign of hostile action,
          reluctantly trained in and secured all guns and set a course to take
          us back to our old area.

4 July 1945
          Patrolling enroute to old area. Celebrated 4th of July by sinking
          one old, rusty oil drum.
1200(I) Position: Lat. 19°-45'N Long. 113°-54'E.

5 July 1945
          Patrolling on station.
1200(I) Position: Lat. 21°-53'N Long. 116°-33'E.
2325(I) Received ComTask Force 71 dispatch 051407 of July 1945 directing us
          to relieve USS CARBONERO of life guard duty on southwest coast of
          FORMOSA. Changed course and speed to comply.

6 July 1945
          Enroute to rendezvous with USS CARBONERO.
1200(I) Position: Lat. 21°-27'N Long. 119°-52'E.
1525(I) Rendezvoused with USS CARBONERO, exchanged movies, and received
          latest information on this area.
1625(I) Having officially relieved USS CARBONERO and bade her good bye,
          commenced patrolling assigned area.

7 July 1945
          Patrolling in area.
1000(I) Commenced circling on assigned station for life guard service.
1200(I) Position: Lat. 22°-03'N Long. 120°-20'E.
1430(I) Secured from life guard service, commenced surfaced patrol of area.

8 July 1945
          Patrolling on station.
1200(I) Position: Lat. 20°-50'N Long. 120°-25'E.
1230(I) Commenced circling on assigned station for life guard service.

— page 321 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.
C-O-N-F-I-D-E-N-T-I-A-L

8 July 1945
1430(I) Secured from life guard service, commenced surfaced patrol of area.

9 July 1945
Patrolling in area.
1100(I) Commenced circling on assigned station for life guard service.
1200(I) Position: Lat. 21°-28'N Long. 120°-37'E.
1400(I) Secured from life guard service, commenced surfaced patrol of area.

10 July 1945
Patrolling in area.
1030(I) Commenced circling on assigned station for life guard service.
1040(I) Sent Cabrilla Serial #2 to ComTask Force 71.
1200(I) Position: Lat. 21°-55'N Long. 120°-21'E.
1300(I) Secured from life guard service, commenced surfaced patrol of area.

11 July 1945
Patrolling in area.
1030(I) Commenced circling on assigned station for life guard service.
1200(I) Position: Lat. 21°-46'N Long. 120°-19'E.
1330(I) Secured from life guard service, commenced surfaced patrol of area.

12 July 1945
Patrolling in area.
1024(I) Sighted Junk on horizon bearing 067°T, headed toward at flank speed.
1041(I) B-24 commenced bombing and straffing Junk.
1115(I) Manned battle stations and brought Junk alongside for inspection.
1130(I) Boarding party away. Junk had women and children with their per-
        sonal effects and some rice. No indication of military cargo.
1140(I) Took two prisoners aboard. Cast off from Junk.
        Received word that plane was heading for us and was going to ditch.
1141(I) All ahead full, proceeding to pick up men from B-24 that is going
        down.
1148(I) Sighted 7 chutes in the air, all blowing toward the beach.
1200(I) Position: Lat. 21°-55'N Long. 120°-20'E.
1210(I) Picked up first of seven men.

— page 322 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

12 July 1945
1212(I) Second man aboard.
1302(I) Third man aboard.
1331(I) Fourth man aboard, injured, giving artificial respiration.
1400(I) Fifth man aboard.
1404(I) Sixth man aboard.
1422(I) Seventh man aboard.
1457(I) Sighted Junk low in the water bearing 297°T.
1506(I) Junk capsized, bearing 310°T. Survivors sitting on keel.
1530(I) Circling on station.
1535(I) Received information that a second plane was being ditched.
1550(I) Came to 135°T, went all ahead full, proceeding to reported posit-
        ion of second ditched plane.
1649(I) With GARAN BI, FORMOSA bearing 036°T, distance 15 miles, the re-
        mains of 1st Lieut. Michael J. FLANAGAN, Jr., 0-798-779, USAAF
        were consigned to the sea with proper last rites.
1729(I) Sent Cabrilla Serial #3 to ComTask Force 71.
2020(I) Sent Cabrilla Serial #4 to ComTask Force 71.
2222(I) Commenced transit of BATAN Channel.
2325(I) Completed transit of BATAN Channel.

13 July 1945
        Conducting search in vicinity of reported position of ditched plane.
0830(I) Sent message to Air Operation Intelligence Center requesting add-
        itional information on downed plane.
1200(I) Position: Lat. 20°-02'N Long 123°-27'E.
1800(I) Discontinued search and set course for Subic Bay in accordance with
        dispatch from ComTask Force 71.
1812(I) Sent Cabrilla Serial #5 to ComTask Force 71.
2105(I) Commenced transit of BATAN Channel.
2300(I) Completed transit of BATAN CHANNEL.

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— page 323 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

14 July 1945
     Enroute Subic Bay in accordance with ComTask Force 71 dispatch.
1200(I) Position: Lat. 10°-05'N Long. 118°-26'E.

15 July 1945
     Enroute Subic Bay.
1030(I) Rendezvous with escort (DE 361). Proceeding to Subic Bay in
          company with escort.
1430(I) Moored starboard side to USS ANTHEDON.

16 July 1945
     Moored starboard side to USS ANTHEDON.
1356(I) Underway from alongside USS ANTHEDON to continue patrol. USS DE
          136, not in an escort.
2007(I) Released escort, proceeding independently to area F-8.

17 July 1945
     Enroute to area in accordance with ComTask Force 71 Op Order 95-45.
1200(I) Position: Lat. 10°-40'N Long. 115°-01'E.

18 July 1945
     Enroute to area.
1200(I) Position: Lat. 10°-26'N Long. 111°-16'E.

19 July 1945
     Enroute to area.
1200(I) Position: Lat. 06°-36'N Long. 106°-51'E.

20 July 1945
     Enroute to area.
0848(I) Sighted sailboat on horizon, maneuvered to bring it along side to
          investigate. Found it to be engaged in fishing.
1200(I) Position: Lat. 01°-29'N Long. 106°-40'E.
1725(I) Crossed the Equator, duly initiated pollywogs.

21 July 1945
     Enroute to area.
1200(I) Position: Lat. 03°-29'S. Long. 109°-43'E.
1452(I) Sighted sailboat bearing 065°T, closed to investigate, found it to
          be a fisherman.

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— page 324 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

21 July 1945
1526(I) Sighted second sailboat, closed to investigato, engaged in fishing.
1850(I) Sighted third sailboat, closed to investigato, engaged in fishing.
1901(I) Sighted fourth sailboat, closed to investigato, engaged in fishing.

22 July 1945
Enroute to area.
0835(I) Sighted sailboat, did not investigatc.
0905(I) Sighted nine more sailboats, did not investigate.
1200(I) Position: Lat. 05°-27'S Long. 115°-12'E.
1201(I) Arrived on station, commenced surface patrol.

23 July 1945
Patrolling on station.
0455(I) Sighted first of 14 sailboats composing fishing fleet. Investi-
gated, found all to be engaged in peaceful occupation of fishing.
1200(I) Position: Lat. 05°-55'S Long 119°-09'E.

24 July 1945
Patrolling on station. Sighted numerous sailboats throughout the
day, investigated, all engaged in fishing for flying fish.
1200(I) Position: Lat. 06°-14'S Long. 118°-13'E.

25 July 1945
Patrolling on station.
1200(I) Position: Lat. 06°-06'S Long 117°-11'E.

26 July 1945
Patrolling on station.
1200(I) Position: Lat. 06°-57'S Long 119°-15'E. Patrolling close inshore
in vicinity of BIMA and SANGGAR Bay, SUMBAWA, N.E.I. Sighted sev-
eral small native boats, nothing else.

27 July 1945
Patrolling on station.
0132(I) Radar contact 10,400 yards, commenced tracking.
0251(I) Established friendly identity with HMS STUBBORN. Secured tracking.
0715(I) Transferred 150 lbs. of fresh meat & 15 lbs of yeast to STUBBORN.

— page 325 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

27 July 1945
1200(I) Position: Lat. 08°-18'S Long. 117°-23'E.

28 July 1945
Patrolling on station.

0100(I) Received message from HMS STUBBORN requesting us to assist her in
        search for Lieut. JONES, RN, who was lost when sailboat he was
        boarding drifted away in the dark.

0658(I) Made contact with HMS STUBBORN, commenced assisting her in search
        close inshore.

1120(I) Rendezvoused with HMS STUBBORN, reported negative results in search
        for Lieut. Jones, continued patrol.

1200(I) Position: Lat. 08°-05'S Long. 117°-59'E. Exchanged calls with
        USS CAIMAN. Sighted several small sailboats during the day.

29 July 1945
Patrolling on station. Our tour of the area has failed to yield
even a worthwhile bombardment target. We shall patrol LOMBOK Strait
tomorrow and south coast of LOMBOK and SUMBAWA the day after.

0633(I) Dove for submerged patrol of LOMBOK Straits.

1850(I) Surfaced.
2300(I) Received ComTask Force 71 dispatch 290421 and in compliance set
        course 220°T, all ahead full, enroute Fremantle, W.A. via safety
        lane. It seems that we telepathetically anticipated this message.

30 July 1945
Enroute Fremantle, W.A. via safety lane.

1200(I) Position: Lat. 12°-17'S Long. 115°-10'E.

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— page 326 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

31 July 1945
          Enroute Fremantle, W.A. via safety lane.
1200(I) Position: Lat. 17°-53'S Long. 113°-41'E.

1 August 1945
          Enroute Fremantle, W.A. via safety lane.
0036(I) Exchanged calls with USS KRACKEN (SS370)
0127(I) Exchanged calls with USS ICEFISH (SS367)
0255(I) Transferred power transformer for BN to USS ICEFISH.
1200(I) Position: Lat. 23°-01'S Long. 112°-38'E.

2 August 1945
          Enroute Fremantle, W.A. via safety lane.
0152(I) Exchanged calls with USS BULLHEAD (SS332)
1200(I) Position: Lat. 28°-45'S Long. 112°-43'E.

3 August 1945
          Enroute Fremantle, W.A. via safety lane.
0645(I) Rendezvoused with M.L. 815. Proceeding to conduct sound test and
          degaussing runs.
0921(I) Moored port side to berth #5, Fremantle, W.A.

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— page 327 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

(C) WEATHER
The weather conditions were normal throughout the patrol.

(D) TIDAL INFORMATION
Currents agreed with those given in Coast Pilots and on charts.

(E) NAVIGATIONAL AIDS
No navigational aids were observed. Navigation along the coast of
SUMBAWA and LOMBOK and among various islands in E. JAVA Sea was a simple matter
with the aid of radar ranges and bearings.

(F) SHIP CONTACTS
1. 7-29-45 Lat. 08°-28'S 2 SD sea trucks 3,000 yards 115°T. Covered by
Long. 116°-02'E. 1 VA type lugger 8 knots. separated re-
port.

2. Numerous sailboats in JAVA Sea area.

(G) AIRCRAFT CONTACTS
No enemy aircraft encountered. While on life guard station numerous
friendly aircraft.

(H) ATTACK DATA
Covered by special report.

(I) MINES
None.

(J) ANTISUBMARINE MEASURES AND EVASION TACTICS
None.

(K) MAJOR DEFECTS AND DAMAGE
Outboard Exhaust: This vessel was delayed one day prior to departure on
patrol because the outboard exhaust valve operating gear on #1 & #2 M.E. was
frozen. This casualty has happened three times previous. These parts are a very
close machining fit and the casualty is undoubtedly caused by a small particle of
grit, or scale becoming wedged in, pressed into the sleeve (Pc #9 BuShips plan SS
285-S41-0332; parts #5125-285) A more enclosed housing might be a remedy for
this trouble. (The bronze bushing was the idea of NELSON, Wiley (n), CMO MM, USN
and met the approval of Comdr. O. EARLE, Engineering Officer, SubRon 24).

Salt Water Pump: The ball bearing on the salt water pump on #1 M.E. dis-
integrated. The entire pump was pulled and a spare installed. The bearing appear-
ed to have sufficient lubrication. It was dry, however, when pulled; but this
is believed to have been the result of running with it highly overheated for
several hours.

H.P. Air Compressor: A defective third stage cooler was replaced by a
spare unit on 12 June. All coolers will be pulled and tested during the coming
refit.

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— page 328 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

(K) MAJOR DEFECTS AND DAMAGE (Con't.)
     Hydraulic System: (1) Three days after leaving Saipan, the hydraulic
supply line to #3 & #4 M.E. outboard exhaust valves developed a serious leak in
a silver solder seam. Numerous attempts to resolder the seam were made without
success. On 16 July, the loss of hydraulic service was such that the USS
CARBONERO donated a better grade of flux. Repairs were then effected by cutting
a section out to the line, crimping the ends of the pipe and sealing the ends
with silver solder. This kept #3 & #4 outboard exhausts in head operation. This
allowed hydraulic service aft to be secured for 22 days at which time the
ing the fueling stop over at Subic Bay on 13 July.
     Starboard Sound Head: (2) Since the last major overhaul of this vessel
in February, the hydraulic packing on the starboard sound head has proved in-
effective, resulting in excessive loss of oil and definite limitations in the use
of the QB sound gear. On two occasions the cables from the head became oil soak-
ed thus grounding out the head. Three attempts at repairs by tenders during the
past 5 months have proved unsuccessful. On 16 July, the loss of hydraulic service
came so excessive as to necessitate securing the hydraulic service forward during
normal surface operation. The QB sound gear has been manned only at Battle stations
during the coming refit, individual stop valves will be installed in the
supply and return lines to both sound heads in accordance with current shipalt.
It is recommend that the present head (of non-standard dimensions) be replaced
completely by a standard-sized head if available or the present head be given a
complete major overhaul.
     Main Motors: While running at 75-90 on #1, #2 & #4 main generators, the
field current on #2 main generator increased to maximum, simultaneously #4 main
generator decreased to zero. Upon investigation, it was found that #2 & #4 main
generators could not be paralleled.
     Cause: The source of the trouble was burned insulation on Lead 103A, Bu-
Ships File No. S8253-S82-L407 AH; GenElec.Co.,Dr. No. WW5939602; which runs from
#2 shunt field clutching switch. This lead was pressed against a resistor in the
generator shunt field rheostat, allowing the current to flow from #2
shunt field to #4. This condition was indicated by the shunt field meters which
indicated max. field current on #2 & minimum on #4 regardless of rheostat posi-
tion. The burned section of the lead was reinsulated. No further difficulty was
experienced. This lead will be renewed, and all others of a similar nature in-
spected during the coming refit.

     It is believed the above casualty could have been prevented had a more
adequate system of protection for those vital circuits been installed. A simple
method of preventing the recurrence of this casualty or any other casualty affect-
ing the main motor and generator field circuits is given below:
     Install 30 amp fuses at the immediate supply terminals of each main gen-
erator and each pair of motor fields. This would isolate any derangement which
might be caused from dirt, loose connection, short circuits or any other accident
of this nature which might occur, from the rest of the circuit. This alteration
is very simple on this ship and on all submarines fitted with General Electric
Ser. 3W39A1 type control panel. The immediate source of supply of the fields
and coils previously mentioned, is a terminal board in the after central section
of the cubicle.
     The terminal block could easily be removed, a fuse and installed. The
added protection of these vital circuits gained by this small alteration would
more than justify the small amount of time and labor required. This alteration was
proposed by ZELZNICKI, Joseph, CEM, USN, attached to this vessel.

-13-

— page 329 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

(L) RADIO
    There were no radio material casualties during this patrol. NPT-1 and NPM
    were copied with good results. NPT-1 was received best on 4370, although 9250
    was fair. Lifeguard frequency 102.5 and 6205 (8KC station) reception was very
    poor. Only one message was received and that was very much garbled and jammed.
    8KC does not give the receiving operator a chance to tune him in. If a series of
    V's was sent before a message was broadcast, reception would be improved. Jamming
    on these frequencies is very strong.
    A message was sent to NPT-1 which VHM accepted for relay transmission to NPT-1,
    NPT-1 never received this message.
    Six transmissions on frequencies 8470 and 4235 were very successful.
    The following serials were missed:
                                        J 22 June J 26 June
                                        M 22 June M 26 June
                                        C 25 June K 13 June
                                        E 25 June
    VHF transmission and reception with planes varied from very good to poor. At
    times success was had at ranges of 20 miles, while at others, signal strength at
    a distance of 5 miles was very weak. There is great room for improvement in this
    low powered transmitter.

(M) RADAR
    SD radar was used continuously during the day - keyed for 3 seconds every ½
    minute at irregular intervals. At night it was left in a standby position and key-
    ed for 3 seconds whenever an APR contact was made. Ranges were good, receiving
    plane contact consistently at 10 miles and maximum at 20 to 25 miles. Land
    (Garan Pt.) was observed at 40 to 50 miles.
    The IFF gear was maintained in a standby position at all times. When SD con-
    tact or visual contact was made, challenges were sent via the BN. If the response
    was friendly, the BK was turned on.
    APR-SPA-1 was manned from dusk to dawn because the SD jams a large port
    of the TN-2 range. The only material casualty, besides replacement of the tubes
    was the replacement of the power transformer, which showed an open, in the SP/
    circuit. The transmitter tube, 15E, in the TN was replaced due to loss of fila-
    ment emission. A few days later this replacement revealed an intermittent short
    between grid and plate.
    It performed excellently until the 2nd of July. On 29 June the cable con-
    trolling the field of the 8KVA motor generator came loose opening the field and
    causing the motor to speed up. Before the unit could be secured the voltage
    risen to 250 volts at 120 cycles. No fuses were blown in the circuit, but this
    voltage overload must have weakened the dielectric strength of the high voltage
    condensers on the SJ. Major troubles were encountered 2nd and 3rd of July.
    The following material repairs were made:
    12 June No high voltage. Replaced 836 tube and a blown fuse.
    16 June Replaced load switch on SJ Main Control Unit.
    20 June Replaced 721 tube and retuned set.
    2 July SJ not drawing high voltage current. Replaced burned out R31 and R36
            in the modulation network. Set now had excessive high voltage
            again. Found C21 shorted placing 300 volts current across
            R31 and R36. Replaced R36 and C21.
    3 July No high voltage current. Discovered bias generator not operating and
            (V8) not functioning. C22B shorted. VR150 and 6SN7 (V2)
            replaced. Operation back to normal. Discovered intermittent short on
            C22B.

-15-

— page 330 —
U.S.S. CABRILLA (SS289)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

(K) MAJOR DEFECTS AND DAMAGE (Con't.)
     Hydraulic System: (1) Three days after leaving Saipan, the hydraulic
supply line to #3 & #4, M.E. outboard exhaust valves developed a serious leak in
a silver solder seam. Numerous attempts to resold the seam were made without suc-
cess. Hydraulic service aft remained secured for 22 days at which time the USS
CARBONERO donated a better grade of flux. Repairs were then effected by cutting
a section out fo the line, crimping the ends of the pipe and sealing the ends
with silver solder. This kept #3 & #4 outboard exhausts in hand operation, but
allowed hydraulic service aft to remain secured during the fueling stop over at
Permanent repairs were effected during the fueling stop over at Subic Bay on 15 July.

     Starboard Sound Head: (2) Since the last major overhaul of this vessel
in February, the hydraulic packing on the starboard sound head has proved in-
effective, resulting in excessive loss of oil and definite limitations in the use
of the QB sound gear. On two occasions the cables from the head became oil soak-
ed thus grounding out the head. Three attempts at repairs by tenders during the
past 5 months have proved unsuccessful. On 16 July, the loss of hydraulic oil be-
came so excessive as to necessitate securing the hydraulic service forward during
normal surface operation. The QB sound gear has been manned only at Battle station
during the fueling stop over at Subic Bay on 15 July.
It is recommend that the present head (of non-standard dimensions) be replaced
completely by a standard-sized head if available or the present head be given a
complete major overhaul.

     Main Motors: While running at 75-90 on #1, #2 & #4 main generators, the
field current on #2 main generator increased to maximum, simultaneously #4 main
generator decreased to zero. Upon investigation, it was found that #2 & #4 main
generators could not be paralleled.

     Cause: The source of the trouble was burned insulation on Lead 103A, Bu-
Ships File No. SS253-362-1407 #H; GenElec.Co.,Dr. No. WW5939602; which runs from
#2 shunt field clutching switch. This lead was pressed against a resistor or
rheostat, allowing the current to flow from #4 shunt field to #2. This condition
indicated max. field current on #2 & minimum on #4, regardless of rheostat posit-
ion. The burned section of the lead was reinsulated. No further difficulty was
experienced. This lead will be renewed, and all others of a similar nature in-
spected during the coming refit.

     It is believed the above casualty could have been prevented had an ad-
equate system of protection for these vital circuits been installed. A simple
method of preventing the recurrence of this casualty or any other casualty affect-
ing the main motor and generator field circuits is given below:
     Install 30 amp fuses at the immediate supply terminals of each main gen-
erator and each pair of motor field circuits. This would isolate any derangement
which might be caused from dirt, loose connection, short circuits or any other accident
of this nature which might occur, from the rest of the circuit. This alteration
is very simple on this ship and on all submarines fitted with General Electric
Ser. 3W39A type control panel and its immediate source of supply of the fields
and coils previously mentioned, is a terminal board in the after central section
of the cubicle.
     The terminal block could easily be removed, a fuse panel installed. The
added protection of these vital circuits gained by this small alteration would
more than justify the small amount of time and labor required. This alteration was
proposed by ZELZNICKI, Joseph, CEM, USN, attached to this vessel.

-13-

— page 331 —
U.S.S. CABRILLA (SS288)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

(M) RADAR (Con't.)
726B tube (Klystron), so replaced it and 721A (TR tube) and returned out. The
existence of surface ducts were discovered 9 and 11 July when land was picked up
on the second trace, distant 150,000 yards. A junk was picked up at 23,000 yards
and a plane (B-24) at 26,000 yards. Surface ducts were also prevalent in the
JAVA and CELEBES Seas.

(N) SOUND
Sound equipment was not used extensively on this patrol. The material
casualties were:
1. Hum in port sound receiver. The cable from the sound shaft to jack
box was replaced eliminating the hum in the JK but not in the QB.
When receivers were exchanged the hum was eliminated.
2. A recurrent hydraulic leak on the starboard sound head appeared once
more. Hydraulic oil leaks past the piston, when the piston is in a
neutral position. Recommendation that a cutoff valve in the hydraulic
system be installed so that hydraulic system to sound heads may be
secured. On the last patrol this same leak occurred and hydraulic oil
drained down the shaft and grounded out the cable at the projector
head. Repair forces at Midway found the shaft to be off size. Replace-
ment of this shaft assembly is necessary.

(O) DENSITY LAYERS
None.

(P) HEALTH, FOOD AND HABITABILITY
The health of the crew was excellent. There were a few cases of minor skin
irritations which were easily cured.
The Commissary Department prepared excellent and well balanced menus through-
out the entire patrol. Food loss was slight.
Living conditions were normal.

(Q) PERSONNEL
(a) Number of men detached after previous patrol 12
(b) Number of men on board during patrol 79
(c) Number of men qualified at start of patrol. 57
(d) Number of men qualified at end of patrol
(e) Number of unqualified men making first patrol 11
The patrol was a long one and comparatively uneventful, except for the rescue
of the personnel from a ditched bomber. Great emphasis was placed on the school
of the boat and the training of personnel under the general supervision of the
Executive Officer, Lieut. J.B. ELLIOTT, Jr., who again demonstrated his ability
to lead and maintain morale at a high level.

-15-

— page 333 —
U.S.S. CAB RII LA (SS283)
Report of 8th War Patrol.

C-O-N-F-I-D-E-N-T-I-A-L

(U) COMMUNICATIONS, RADAR AND SONAR COUNTERMEASURES (Con't.)

| No. | Date | Time | Freq. | PRF   | Pulse | Rot. | Lobe | Str. of Sketch | Remrks                                  |
|-----|------|------|-------|-------|-------|------|------|||
|     |      | GCT  | MCS   | (cps) | Width | Rate |      |                |                                         |
| 10**| 7-4  | 0100 | 160   | 500   | 7&3   | ---  | No   | 4              | Probable friendly air                   | search radar (ASW)                      |
| 11**| 7-8  | 1155 | 160   | 750   | 24    | 1    | No   | 4              | Land base, (SW Formosa)                 |
| 12  | 7-8  | 2145 | 160   | 500   | 8     | ---  | No   | 3              | Possible Jap Sub.                       |
| 13**| 7-11 | 1432 | 155   | 200   | 5     | ---  | No   | 1              | Land base, (SW Formosa)                 |
| 14**| 7-12 | 1712 | 160   | 750   | 30    | ---  | No   | 2              | Land base, (SW Formosa)                 |
| 15  | 7-16 | 1115 | 220   | 60    | 5     | 2    | No   | 1              | Ship Borne, probable SC                 |
| 16  | 7-19 | 2115 | 155   | 500   | 2     | 1    | No   | 1              | Land base, air search                   | Karimate Straits                        |
| 17**| 7-23 | 1050 | 190   | 2000  | 10    | 1/3  | No   | 4              | Land base, air search on                | point below Macassar                    | City                                    |
| 18  | 7-29 | 1105 | 156   | 500   | 5     | 1/2  | No   | 5              | Land base, air search                   | on Bali                                 |

**Historik marks contact which was picked up each time ship came into range of
radar station.

(V) REMARKS
None.

-17-

— page 334 —
FC5-30/A16-3
Serial: 0139
C-O-N-F-I-D-E-N-T-I-A-L

FIRST ENDORSEMENT to
USS CABRILLA (SS288)
Report of Eighth War
Patrol.

From:
To :
Via :

Subject:

SUBMARINE SQUADRON THIRTY
Mlk
Care of Fleet Post Office
San Francisco, California
4 August 1945.

The Commander Submarine Squadron THIRTY.
The Commander in Chief, U.S. FLEET.
(1) The Commander Submarines, SEVENTH FLEET.
(2) The Commander SEVENTH FLEET.

U.S.S. CABRILLA (SS288) - Report of Eighth War Patrol.

1. The eighth war patrol of the CABRILLA under the command of
Lieutenant Commander H. C. LAUERMAN, U.S. Navy, was conducted in the SOUTH
CHINA SEA and JAVA SEA areas. Patrol was of sixty-two days duration with
thirty-two days being spent in the area.

2. Area coverage was excellent and the patrol well planned and
conducted. Numerous sailboats and junks were contacted, were investigated
and not molested due to their friendly character. Two Chinese were taken
off a junk that had been strafed by a B-24. Two seartrucks and escort were
contacted in LOMBOK STRAIT and attacked. This attack is covered by a
separate report.

3. Twenty-five days were spent on station in the SOUTH CHINA
SEA performing life guard services. Seven Army aviators were expeditiously
rescued on 12 July from a ditched B-24. One aviator was dead and was
buried at sea, the others were taken into Subic on 15 July.

4. The CABRILLA returned from patrol clean and in good material
condition. Refit will be completed in normal time.

5. The Squadron Commander congratulates the Commanding Officer,
officers and crew of the CABRILLA upon the completion of a long arduous
patrol and upon the rescue of seven Army aviators.

[SIGNATURE: C. C. Smith]
C. C. SMITH.

11 0103

— page 335 —
[HANDWRITTEN: 1471]
FEZ4-71/A16-3 UNITED STATES NAVY [HANDWRITTEN: A16-3] 11/wn

Serial 0472-A
C-O-N-F-I-D-E-N-T-I-A-L 1 September 1945

SECOND ENDORSEMENT to:
USS CABRILLA Conf. Ltr.
A16-3 Serial (05-45) dated
3 August 1945. Report of
Eighth War Patrol.

From: The Commander Submarines SEVENTH FLEET.
To : The Commander in Chief, UNITED STATES FLEET.
Via : The Commander SEVENTH FLEET.

Subject: U.S.S. CABRILLA (SS288) - Report of Eighth War
Patrol (27 June to 3 August, 1945).

1. The Eighth War Patrol of the CABRILLA, under the
command of Lieutenant Commander H. C. LAUERMAN, U.S.N., was a
long, arduous sixty-two day patrol with twenty-five out of
thirty-two days on station being spent on lifeguard duties in
the SOUTH CHINA SEA.

2. CABRILLA had the pleasure of rescuing six Army
aviators who had been forced to parachute from their damaged
B-24 and the sad duty of burying at sea a seventh who was dead
when recovered. No opportunities for torpedo or gun attack on
enemy ships presented themselves although CABRILLA carefully
investigated several native craft encountered.

3. The award of the Submarine Combat Insignia is
authorized for this patrol.

4. The Force Commander congratulates the Commanding
Officer, Officers, and Crew on the completion of this long
patrol in which six Army aviators were rescued and saved for
further strikes against the enemy.

[SIGNATURE: James Fife]
JAMES FIFE.
ORIGINAL COPY.

11 0103

— page 336 —
FE24-71/A16-3
Serial 0472-A
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to:
USS CABRILLA Conf. Ltr.
A16-3 Serial (05-45) dated
3 August 1945. Report of
Eighth War Patrol.

Subject: U.S.S. CABRILLA (SS286) - Report of Eighth War
Patrol (27 June to 3 August, 1945).

DISTRIEUTION
Cominch (3) Direct | ComSubRon-22 (2)
Opnav (2) Direct | ComSubRon-26 (2)
Opnav Op-23c (1) | ComSubRon-30 (2)
Com1stFlt (1) | DivComSubRon-22 (1 each)
Com2ndFlt (1) | DivComSubRon-26 (1 each)
Com7thFlt (2) | DivComSubRon-30 (1 each)
ComSubs1stFlt (30) | S/M School, N.L. Conn. (2)
ComSubs2ndFlt (4) | Comdt. NYD. Puget Sound(1)
CTF-71 (7) | SubAd, Mare Island (2)
CTG-71.5 (2) | S/Ms 7thFlt (1)
ComSubPac Adcom (1) (airmail)

[SIGNATURE: J B Miller]
J. B. MILLER,
Flag Secretary.

[HANDWRITTEN, rotated 90 degrees counter-clockwise: 707]

- 2 -
UNITED STATES NAVY
11/hn
1 September 1945

— page 337 —
UNITED STATES FLEET
COMMANDER SEVENTH FLEET
[STAMP: F 489]
[HANDWRITTEN: 11 0103]
[STAMP: FILE COPY]

A16-3(F-3/gtc)
Serial: [HANDWRITTEN: 0299]

[HANDWRITTEN: 8 OCT 1945]

C-O-N-F-I-D-E-N-T-I-A-L
THIRD ENDORSEMENT to:
CO USS CABRILLA conf
ltr SS288/A16-3, serial
05-45, dated 3 August
1945.
[HANDWRITTEN: 9-02604]

From: Commander Seventh Fleet.
To : Commander-in-Chief, United States Fleet.

Subject: U.S.S. CABRILLA (SS288) - Report of
Eighth War Patrol.

1. Forwarded.

[SIGNATURE: J. H. Long]
J. H. LONG
By direction

[HANDWRITTEN: X]

— page 338 —
END OF REEL
JOB NO. [HANDWRITTEN: AR-302-76]

I.0
[lines]
| 2.8 | 2.5
| 3.2 | 2.2
| 3.6 | 2.0
| 4.0 | 1.8
I.1
[lines]
1.25 [lines] 1.4 [lines] 1.6 [lines]

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[DEPARTMENT OF DEFENSE SEAL]

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION

D-82294

— page 339 —
START OF REEL
JOB NO. [HANDWRITTEN: AR-53-81]
[HANDWRITTEN: E. 108]

| 1.0 | 2.8 | 2.5 |
|     | 3.2 | 2.2 |
| 1.1 | 3.6 | 2.0 |
|     | 4.0 | 1.8 |
| 1.25 | 1.4 | 1.6 |

OPERATOR [HANDWRITTEN: L Frye]

DATE [HANDWRITTEN: 5-5-81]

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[IMAGE: Department of Defense seal with text "DEPARTMENT OF DEFENSE" and "UNITED STATES OF AMERICA"]

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION

REEL TARGET - START AND END
NDW-NPPSO-5210/1 (6-78)

— page 340 —
[HANDWRITTEN: NRS 18]

[HANDWRITTEN: CABRILLA (SS-288)]
[HANDWRITTEN: WWII REPORT FILE]

[HANDWRITTEN: 16MM]

— page 341 —
A
DECLASSIFIED
DATE 19-20 October 1943             NAME      CABRILLA
FROM Commanding Officer USS CABRILLA(SS-288)
                                    SERIAL    001
                                    DATE      6 November 1943
SUBJECT SPECIAL MISSION

Report(to CTF 71)of evacuation of small party of Army
officers from Negros Island. Mission on FIRST WAR
PATROL, successful.
(SOWESPAC:SUB OPS)
FILED: War Diary
       Separately       as CARBON COPY

MICROSERIAL NO.                     | ACTION REPORT OPNAV FORM 3480-1 (11-55)
                                    | G 20432

                                                                                             A
DECLASSIFIED
DATE 18 December 1943               NAME      CABRILLA
FROM Commanding Officer USS CABRILLA(SS-288)
                                    SERIAL    002
                                    DATE      19 December 1943
SUBJECT SPECIAL MISSION

Report(to CTF 71)of mine plant southwest of Kaw Rongsallen
Islands off east coast of Gulf of Siam. Eleven mines
laid in field during SECOND WAR PATROL.
(SOWESPAC:SUB OPS)
FILED: War Diary
       Separately       as CARBON COPY DUPLICATE COPY

MICROSERIAL NO.                     | ACTION REPORT OPNAV FORM 3480-1 (11-55)
                                    | G 20432

DATE 10 Sep-22 Oct 1944             NAME      CABRILLA
FROM CROSS INDEX CARD
                                    SERIAL
                                    DATE
SUBJECT Coordinated Attack Group

Report of coordinated search & attack operations of USS
HOE,USS CABRILLA & USS ASPRO off LUZON. 92,900 tons
sunk or damaged.
(SOWESPAC:SUB OPS)
FILED: War Diary
       Separately under USS HOE ser 016 of 22 Oct 44

MICROSERIAL NO.                     | ACTION REPORT OPNAV FORM 3480-1 (11-55)
                                    | [UNCLEAR: G-20432]

— page 342 —
DATE: 29 July 1945                                 F.ME CABRILLA
TO:
FROM: CO - USS CABRILLA(SS-288)
                                                   SERIAL    none
                                                   DATE      none
SUBJECT: SUBMARINE ACTION REPORT, Forwarding of
Report of firing of MARK 27 torpedoes on EIGHTH WAR
PATROL. No damage to enemy is claimed in action in
JAVA SEA Area.
(COMESZAC: SUB OPS)
FILED: War Diary
Separately as ORIGINAL [STAMP: PROCESSED COPY]

MICROFILM. NO.                                     | ACTION REPORT OPNAV FORM 3480-13 (11-55) 3-30003

— page 343 —
A

DATE: 29 July 1945
R.ME CABRILLA
FROM: CO - USS CABRILLA(SS-288)
SERIAL none
DATE none

SUBJECT: SUBMARINE ACTION REPORT, Forwarding of

Report of firing of MARK 27 torpedoes on EIGHTH WAR
PATROL. No damage to enemy is claimed in action in
JAVA SEA Area.
(COMSUBPAC: SUB OPS)
FILED: War Diary

Separately as ORIGINAL PROCESSED COPY

MICROSERIAL NO.
ACTION REPORT OPNV FORM 1880-13 (11-55)

— page 344 —
In reply refer to:
A8
(001)
[STAMP: DECLASSIFIED]
[STAMP: SECRET]
U. S. S. CABRILLA (SS288)

c/o Fleet Post Office
San Francisco, Calif.

6 November 1943

From: The Commanding Officer.
To: The Commander Task Force Seventy-one.
Via: (1)The Commander Submarine Division 161.
     (2)The Commander Submarine Squadron 16.

Subject: Evacuation of U.S. and Philippine Army
         officers from Negros Island.

References: (a) Comtaskfor 71 secret despatch 051634 of
             October, 1943.
            (b) Comtaskfor 71 secret despatch 090920 of
             October, 1943.

Enclosure: (A) Reconnaissance report of pick up point,
             including undeveloped negatives of photo-
             graphs taken.

         1. On 19 October 1943, daylight submerged re-
connaissance was made of Doog Point, Negros Island, and ad-
jacent coast lines. The designated security signal, a white
disc on a pole facing to seaward, was located in two places,
one at the Village of Kulippa and one about three miles
north of Doog Point. Since only one disc was expected, the
presence of two tended to cause confusion. These signals
were both clearly visible at periscope depth approximately
five miles to seaward and would undoubtedly attract the at-
tention of patrol boats passing close to the coast provided
binoculars were used. No difficulty was experienced in lo-
cating the designated pick up point.

         2. Several sail boats were sighted during 19 and
20 October and most of the two days was spent investigating
these in an attempt to find one flying the proper security
signal. Failure to contact the party on the 19th was prob-
ably due to the fact that we were investigating too far to
the north to see the correct boat as it left Kulippa in the
late afternoon.

-1-

— page 345 —
AB
( 001 ) SECRET U.S.S. CABRILLA (SS288)
6 November 1943
Subject: Evacuation of U.S. and Philippine Army
officers from Negros Island.

3.
At about 1500 H on 20 October a small boat was
sighted in the vicinity of Kulippa. The range was closed
and the first designated security signal, a white disc
and a white sheet at the stern, was made out at about
1600 H. At this time we had considered that difficulty had
been experienced in obtaining a white disc for the bow but
we later learned that the party picked up did not have
the same information as to signals for either the beach or
the boat as outlined in references (a) and (b). At 1751 H
we surfaced about two miles off the beach and within 500
yards of the boat, which was a small out rigger type under
sail.

4. The following named officers were received
on board:

Major J.A. Villamor, U.S. Army
Major H.L. Heider, U.S. Army
Captain B. Cabangbang, Philippine Army
Captain E.L. Torres, Jr., Philippine Army

5.
A quantity of food, cigarettes, matches,
toilet articles, clothing, canvas, all the quinine on board,
tools and other miscellaneous articles thought to be of
value were ready and loaded into the boat. As soon as it
was determined from Major Villamor that the boat crew belonged
to an organized band of guerrillas, and that it would be put
to good use, all readily available .30 caliber and .45 ammu-
nition and a Thompson sub machine gun were also loaded in the
boat. From information obtained from Major Villamor small
arms and ammunition of any kind, and medicines, particularly
quinine, are badly needed by the guerrillas and there is a
scarcity of food and clothing.

6.
There was no evidence of enemy activity in the
area during the two day period. However, information gained
from the evacuees indicates that the enemy uses both sail
boats and motor boats for patrolling the coast line. These
boats are used primarily to investigate and prevent inter-
island trading by sail. These patrol vessels carry from ten
to twenty men and are armed with machine guns and rifles.
Larger patrol boats have been sighted, and upon one occasion
a destroyer remained in the area for one day. Planes occasion-
ally fly to seaward and return to Cebu after short periods.

-2-

— page 346 —
A8
( 001 ) SECRET U.S.S. CABRILLA (SS238)
6 November 1943
Subject: Evacuation of U.S. and Philippine Army
officers from Negros Island.

[HANDWRITTEN: ->] Major Villamor estimates that at least eighty-five percent
of the sailing traffic is friendly. He also reports that the
enemy normally uses a square type sail while all native boats
except a few friendly Morro traders use triangular sails.

7. Since any signal on the beach might attract
enemy patrols, it is considered that a security signal on
the beach is not necessary or desirable in this particular
area at the present time. It is recommended that the vicinity
of the Village of Kulippa be used as a departure point, pre-
ferably in the late afternoon, and that a security and identi-
fication signal be flown only for short intervals at desig-
nated times, and then only if other boats are not in the
vicinity. The Village of Kulippa is deserted except for a
few guerrillas, consists of about six Nipa huts close to the
beach, and is easy to locate from seaward.

8. All officers and men, including the passengers,
have been impressed with the necessity for the strictest
secrecy concerning this mission.

[SIGNATURE: D.T. Hammond]
D.T. HAMMOND

— page 347 —
FB5-161/A9/A14-5
Serial 001

SUBMARINE DIVISION ONE SIXTY-ONE

S-E-C-R-E-T
7 November 1943

FIRST ENDORSEMENT to
C.O. CABRILLA ltr.
A8, serial 001 of 11/6/43.

From: The Commander Submarine Division ONE SIXTY-ONE.
To : The Commander Task Force SEVENTY-ONE.
Via : The Commander Submarine Squadron SIXTEEN.

Subject: Special Mission of CABRILLA - Report on.

1. Forwarded.

[HANDWRITTEN: 00126]

[SIGNATURE: Robert A. Knapp]
ROBERT A. KNAPP.

— page 348 —
FE24-71/A8-2(1) UNITED STATES NAVY 16-lcs
Serial [HANDWRITTEN: 00450]
SECRET

SECOND ENDORSEMENT to 20 NOV 1943
USS CABRILLA secret ltr
A8 serial 001 of 6 Nov. 1943.

From: Commander Task Force SEVENTY-ONE.
To : Commander SEVENTH FLEET.

Subject: Special Mission of USS CABRILLA - Report on.

Reference: (c) CTF-71 conf ltr FE24-71/S35 serial 0903
of 14 Nov. 1943.

1. Forwarded. The undeveloped negatives mentioned in
enclosure (A) of basic letter were forwarded under reference (c).

[SIGNATURE: R. W. Christie]
R. W. CHRISTIE

— page 349 —
A8/A16-3                                                              UNITED STATES FLEET
                                                               COMMANDER SEVENTH FLEET                                25/cs

Serial: 001439
SECRET                                                                                                [STAMP: NOV 30 1943]

THIRD INDORSEMENT to
C.O. USS CABRILLA Secret
Ltr. A8, serial 001 of
6 November 1943.

From:             The Commander SEVENTH FLEET.
To:               The Commander in Chief, SOUTHWEST PACIFIC AREA.

Subject:          Special Mission of USS CABRILLA - Report on.

1.                Forwarded for information.

2.                Return of all papers is requested.

                                                               [SIGNATURE: A. H. McCOLLUM]
                                                               A. H. McCOLLUM,
                                                               By direction.
                                                                                                [HANDWRITTEN: 2979]

— page 350 —
U.S.S. CABRILLA (SS288)
c/o Fleet Post Office
San Francisco, Calif.
[STAMP: DECLASSIFIED OPNAN INST 5510.19] 19 December 1943
[HANDWRITTEN: 4K DATE 10-4-60]

SS288/S76
( 002 ) [STAMP: RECLASSIFIED]
[STAMP: SECRET]
From: The Commanding Officer.
To: The Commander [STRIKETHROUGH: in command, Submarines] Task Force SEVENTY-
Via: (Official channels). ONE.

Subject: Mine field, report of laying on 18 December 1943,
during the Second War Patrol of this vessel.

Reference: (a) Commander Task Group Seventy-one point one
operation order 45-43 of 29 November 1943.

Enclosure: (A) Track chart (To Commander Task Group Seventy-
one point one only).

1.
A field of eleven Mark 12 mines was layed on the
night of 18 December 1943, southwest of KAW RONOSAN ISLAND
off the east coast of the GULF OF SIAM. All mines were layed
within the area specified by reference (a), which is a rectangle
defined by the following points:-

| | Lat. | Long. |
|---|---|---|
| (a) | 10-33-00 N | 103-16-15 E |
| (b) | 10-31-50 N | 103-17-10 E |
| (c) | 10-29-00 N | 103-12-50 E |
| (d) | 10-30-30 N | 103-12-00 E |

2.
The field was layed while on the surface and it
was possible to accurately fix the position of the CABRILLA at
the time of laying the first and last mines by means of visual
bearings and radar ranges. The track of this vessel was, in
general, that of a sine curve during the laying, and the inter-
val between mines was 1000 yards.

| | Lat. | Long. |
|---|---|---|
| (a) | Position of first mine:- 10-32-10 N | 103-16-30 E |
| (b) | Position of last mine:- 10-29-40 N | 103-13-00 E |

Courses and distances from position (a) were as
follows:-
265°(T) for 3000 yards
240°(T) for 1000 yards
200°(T) for 3000 yards
240°(T) for 1000 yards
265°(T) for 2000 yards

- 1 -

— page 351 —
U.S.S. GABRILLA (SS286)
c/o Fleet Post Office
San Francisco, Calif.

SS288/S76
( 002 )

SECRET                                                19 December 1943

Subject: Mine field, report of laying on 18 December 1943,
         during the Second War Patrol of this vessel.

— page 352 —
F124-71/376
Serial: 0026
[CROSSED OUT: S-E-C-R-E-T]

From:
To:
Subject:
Enclosure:

1. A copy of the report of laying of mine-
field by the U.S.S.CABRILLA on 18 December, 1943, is for-
warded herewith for information.

UNITED STATES NAVY
16/ens

25 JAN 1944

Commander Task Force, SEVENTY-ONE.
Commander SEVENTH FLEET.
Mine field, report of laying of.
(A) Copy of subject report.

P. G. NICHOLS,
Chief of Staff

— page 353 —
[HANDWRITTEN: On-Jpm]
[HANDWRITTEN: D.]

SS258/A16-3
U.S.S. HOE (SS258)

Serial 016
Care of Fleet Post Office,
San Francisco, California,
[STAMP: DECLASSIFIED] DOD DIR 22 October 1944.

[HANDWRITTEN: OP 09B1C] [HANDWRITTEN: DATE 10-8-L]

From: The Commanding Officer, U.S.S. HOE.
To: The Commander-in-Chief, United States Fleet.
Via: (1) The Commander Submarine Squadron TWELVE.
(2) The Commander Submarines, SEVENTH FLEET.
(3) The Commander, SEVENTH FLEET.

Subject: War Patrol of Coordinated Search and Attack
Group Consisting of U.S.S. HOE, U.S.S.
GUAVINA, U.S.S. CABRILLA and U.S.S. ASPRO, from 10 September
1944, to 22 October 1944.

Enclosure: (A) Subject War Patrol Report.

1. Enclosure (A), covering the subject war patrol
is herewith submitted. This group operated in the South China
Sea off the northwest coast of LUZON.

[SIGNATURE: V. B. McCrea]
V. B. McCREA.

[STAMP: 101479] [STAMP: FILMED]

— page 354 —
Subject: War Patrol of Coordinated Search and Attack
         Group Consisting of U.S.S. HOE, U.S.S.
         CABRILLA, and U.S.S. ASPRO.

— page 355 —
(Subject: The Patrol of Coordinated Search and Attack
Group Consisting of U.S.S. HOE, U.S.S.
CABRILLA, and U.S.S. ASPRO.

(B) NARRATIVE (Cont'd)

one medium tanker and damaged one able King
off CAPE BOJEADOR on 2 October 1944.
CABRILLA advised that she had sunk one medium
tanker and damaged one medium tanker on
1 October 1944, off CAPE BOJEADOR.

I decided to maint in close inshore patrol
with rendezvous each night thirty miles off
coast. Sent ASPRO to patrol off CALAYAN
POINT, HOE off CANDON POINT, and CABRILLA
off SEVILLA. At rendezvous that night
ASPRO reported that she had sunk able King
previously damaged on 2 October 1944. HOE
no contacts. CABRILLA reported she had
sighted three small able Kings, but was
unable to close for attack. The rendezvous
for this night had been made too far off the
coast to return there prior to daylight in
the heavy sea that was building up. Therefore,
entire group was assigned to patrol traffic
from focal point at Lat. 18° - 20' N. Long.
118° - 50' E. on 4 October 1944.

4 October 1944

No contacts.

2400 H At rendezvous, assigned CABRILLA to operate
off CAPE BOJEADOR, HOE off CANDON POINT, and
ASPRO off POINT SANTO, next day.

5 October 1944

0050 H Changed ASPRO'S area to position south of
POINT DILE.

1210 H HOE observed two trawlers operating as mine-
sweepers south of CANDON POINT.

2300 H At rendezvous, ASPRO and CABRILLA reported no
contacts.

Assigned ASPRO to position off CANDON POINT,
CABRILLA to POINT SOLVEC, HOE to CAPE BOJEADOR.

ENCLOSURE (A) -2-
3

— page 356 —
Subject: War Patrol of Coordinated Search and Attack
         Group Consisting of U.S.S. HOE, U.S.S.
         C.BRILL, and U.S.S. SPRO.

— page 357 —
Subject: War Patrol of Coordinated Search and Attack
Group Consisting of U.S.S. HOE, U.S.S.
CARGILL, and U.S.S. ASPRO.

— page 358 —
CONFIDENTIAL
CONFIDENTIAL
Subject: War Patrol of Coordinated Search and Attack
         Group Consisting of U.S.S. HOE, U.S.S.
         CABRILLA, and U.S.S. ASPRO.

(C) COMMUNICATIONS (Cont'd)

         The aircraft code proved very satisfactory.

(D) REMARKS

         None.

(E) DAMAGE TO ENEMY

         1. It is estimated that the following damage was
            inflicted on the enemy.

BY        No. SHIPS     TYPE           DAMAGED OR SUNK
ASPRO     1             Large AK       Damaged
ASPRO     1             Med. AO        Sunk
ASPRO     1             Med. K         Sunk
ASPRO     1             Large AO       Probably Sunk
CABRILLA  1             Med. AK        Sunk
CABRILLA  1             Med. AO        Sunk
CABRILLA  1             Large AO       Damaged
CABRILLA  1             Med. AK        Damaged
CABRILLA  1             Med. AK        Sunk
HOE       1             Large AK       Probably Sunk
HOE       1             Unidentified AK Damaged
HOE       1             Unidentified AK Damaged
HOE       1             Unidentified AK Damaged
HOE       1             Large AK       Sunk
HOE       1             Escort Vessel  Damaged

ENCLOSURE (A) [HANDWRITTEN: -5-]
[HANDWRITTEN: 6]

— page 359 —
FC5-12/A16-3
SUBMARINE SQUADRON TWELVE.

Serial 0324
Care of Fleet Post Office,
San Francisco, California.
26 October 1944.

CONFIDENTIAL
FIRST ENDORSEMENT to
CO HOE Conf ltr SS256/
A16-3 Serial 016 dated
22 October 1944.

From: The Commander Submarine Squadron TWELVE.
To : The Commander in Chief, United States Fleet.
Via : (1) The Commander Submarines, SEVENTH FLEET.
(2) The Commander, SEVENTH FLEET.

Subject: Report of Coordinated Search and Attack Group
Consisting of HOE, CABRILLA and ASPRO - Comments
on.

1. The coordinated search and attack group under the command
of the Commanding Officer of the U.S.S. HOE operated as such from 3 October
to 7 October 1944, when both the ASPRO and CABRILLA had expended all tor-
pedoes and were ordered to leave the area. During the period of their
operations one coordinated attack was made on a twelve to fourteen ship
convoy. The HOE made the first contact and attacked a large AK. The
ASPRO and CABRILLA reached positions for attacks and each sank an AK with
their last remaining torpedoes.

2. The reports of the ASPRO and CABRILLA are not available at
this time so there is no information as to their action against the large
convoy contacted by the ASPRO on 6 October 1944.

3. The method of conducting voice communication by this group
is of interest in that no enemy interference was experienced. The need for
training SJ radar operators in sending and receiving for SJ radar keying
is apparent.

[SIGNATURE: J.B. Griggs]
J.B. GRIGGS

[HANDWRITTEN: 7]

— page 360 —
[HANDWRITTEN: F4354]
1 0509

FE24-71/A16-3
UNITED STATES NAVY
12a/pr
Serial 01560
19 December 1944

SECOND ENDORSEMENT to:
USS HOE Conf. ltr. A16-3
Serial 016, dated 22
October, 1944.
[HANDWRITTEN: C-Ltr]
[HANDWRITTEN: 1-16-45]
[HANDWRITTEN: R-uss.]
[HANDWRITTEN: 1-16-45.]

From: The Commander Submarines, SEVENTH FLEET.
To: The Commander in Chief, UNITED STATES FLEET.
Via: The Commander, SEVENTH FLEET.

Subject: Report of Coordinated Search and Attack Group
Consisting of U.S.S. HOE, U.S.S. CABRILLA and
U.S.S. ASPRO - Comment on.

1. The Coordinated Search and Attack Group consisting
of HOE, CABRILLA and ASPRO, under the direction of Commander V. B.
McCREA, U.S.N., Commanding Officer HOE, patrolled in the SOUTH
CHINA SEA off the west coast of LUZON, from the 3rd to the 7th of
October.

2. For daylight cruising submerged on the 4th the
O.T.C. assigned ASPRO a position close in to CANDON POINT and
CABRILLA a position close in to POINT SOLVEC. This enabled ASPRO
to attack a northbound convoy at 0830 and CABRILLA to attack the
same convoy at 1358. These attacks resulted in the sinking of one
large AO and one medium AK, and the damaging of another large AO.

3. At 0153 on the morning of the 7th HOE made radar
contact on a southbound convoy and then proceeded to maneuver the
whole group into position for a series of coordinated surface
attacks which sank three AKs and damaged a fourth. As a result
of these attacks both ASPRO and CABRILLA were out of torpedoes
and CABRILLA was directed to return to base.

4. ASPRO did not immediately break off contact with
this convoy, but doggedly hung on for the remainder of the day in
the face of heavy air and surface opposition and tracked until
HOE again regained contact at 0120 the next morning. In the
succeeding attacks HOE sank one large AK and damaged four other
ships, including one unidentified escort.

5. This group was ably directed by O.T.C., and each
of the three coordinated attacks was a result of effective
leadership and clear-headed teamwork on the part of the three
members of the group. ASPRO is particularly to be commended for

[STAMP: FILMED] - 1 -

[STAMP: EXTRA : ORIGINAL]
[STAMP: SORG. MICRO]
[STAMP: PHOTO-LAB OP-16]
[STAMP: RETURN TO F-4253]
[HANDWRITTEN: 8]

— page 361 —
FE24-71/A16-3                               UNITED STATES NAVY                     12a/hr
Serial 01560                                                                 19 December 1944

SECOND ENDORSEMENT to:
USS HOE Conf. Ltr. A16-3
Serial 016, dated 22
October 1944.

Subject:           Report of Coordinated Search and Attack Group
                   Consisting of U.S.S. HOE, U.S.S. CABRILLA and
                   U.S.S. ASPRO - Comment on.

tracking work following the expenditure of all torpedoes; and the
third attack of the group was made possible by this Commanding
Officer's initiative.

          6.     The Force Commander congratulates the Group
Commander, ASPRO, CABRILLA and HOE on this most successful and
profitable patrol. It is estimated that the following damage was
inflicted upon the enemy by this group:

                   SUNK

1 - AK (Large - EU)             7,500 Tons (HOE Attack No. 1)
1 - AK (Large - EU)             7,500 Tons (HOE Attack No. 5)
1 - AK (Large - EU)             7,500 Tons (ASPRO Attack No. 1)
1 - AO (Medium - EU)            5,000 Tons (ASPRO Attack No. 2)
1 - AK (Medium - EC)            5,500 Tons (ASPRO Attacks No. 3
                                           and 4)
1 - AK (Large - EU)             7,500 Tons (ASPRO Attack No. 6)
1 - AK (TEIYO MARU type EC)     6,900 Tons (CABRILLA Attack
                                           No. 1)
1 - UN                          4,000 Tons (CABRILLA Attack
                                           No. 2)
1 - AO (RIKKO MARU type EC)     9,200 Tons (CABRILLA Attack
                                           No. 3)
1 - AK (TAKUSHIMA MARU type EC) 4,900 Tons (CABRILLA Attack
                                           No. 2)
1 - AK (FUSHIMI MARU type EC)   4,900 Tons (CABRILLA Attack
                                           No. 4)

                   Total Sunk 70,400 Tons

                               - 2 -                               [HANDWRITTEN: 9]

— page 362 —
FE24-71/A16-3 UNITED STATES NAVY 12a/hr
Serial 01560 19 December 1944

SECOND ENDORSEMENT to:
USS HOE Conf. Ltr. A16-3
Serial 0160
dated 22
October, 1944.

Subject: Report of Coordinated Search and Attack Group
Consisting of U.S.S. HOE, U.S.S. CABRILLA and
U.S.S. ASPRO - Comment on.

DAMAGED
1 - AK (Medium - EU) 4,000 Tons (HOE Attack No. 2)
1 - AK (UN) 4,000 Tons (HOE Attack No. 3)
1 - AK (UN) 4,000 Tons (HOE Attack No. 4)
1 - Escort (UN) 500 Tons (HOE Attack No. 5)
1 - AO (Large - EU) 10,000 Tons (ASPRO Attack No. 5)
22,500 Tons
Grand Total 92,900 Tons

R. W. CHRISTIE

DISTRIBUTION:
Cominch (3) - Direct CTG-71.5 (2)
Vice Opnav (2) - Direct CTG-71.6 (2)
Vice Opnav Op-25c (1) CTG-71.9 (2)
ComlstFlt (1) ComSubRon-13 (2)
Com2ndFlt (1) DivComSubRon-12 (1 ea)
Com3rdFlt (1) DivComSubRon-10 (1 ea)
ComSubPac (30) DivComSubRon-1 (1 ea)
ComSub2ndFlt (4) ComSubDiv-16 (1)
CTF-71 (7) S/L School, N.L. Conn. (2)
CTG-71.3 (2) SubAd, Mare Island. (2)
CTG-71.4 (2) S/L 7th Flt (1)

[SIGNATURE: J. B. Miller] THIS REPORT IS TO BE DESTROYED PRIOR
J. B. MILLER, TO ENTRY INTO ENEMY CONTROLLED WATERS.
Flag Secretary.

- 3 -
10

— page 363 —
[HANDWRITTEN: 495]
[HANDWRITTEN: 1 02:30]

UNITED STATES FLEET
COMMANDER SEVENTH FLEET

A16-3(2)(C)(F-3/cgj)
Serial: 0223
C-O-N-F-I-D-E-N-T-I-A-L

[STAMP: 10 JAN 1945]

THIRD ENDORSEMENT to:
USS HOE conf. ltr.
A16-3 serial 016,
dated 22 October 1944.

From: The Commander Seventh Fleet.
To : The Commander-in-Chief, United States
Fleet.

Subject: Report of Coordinated Search and
Attack Group consisting of U.S.S. HOE,
U.S.S. CABRILLA and U.S.S. ASPRO -
comment on.

1. Forwarded.

2. The Commander Seventh Fleet notes the
able direction of the coordinated search and attack
group and congratulates the Group Commander, HOE,
CABRILLA and ASPRO on a most effective coordination,
and heavy damage inflicted on the enemy.

[SIGNATURE: C. E. Van Hook]
C. E. VAN HOOK
Deputy

Copy to:
ComSubs7thFlt
ComSubRon-12
CO, USS HOE (SS258)

— page 364 —
[HANDWRITTEN: 29N4S 8WP JAVA SEA AREA]
[HANDWRITTEN: 2]
[HANDWRITTEN: Original]

[STAMP: TOP SECRET]
[STAMP: DECLASSIFIED]

From: The Commanding Officer; U.S.S. CABRILLA (SS288)
To : The Commander-in-Chief, United States Fleet.
Via : Official Channels.

Subject: U.S.S. CABRILLA (SS288), Top Secret Report of
Firing Mark 27 Torpedoes, Patrol No. Eight.

Enclosure: (A) Subject Report.

1. Enclosure (A) is forwarded herewith.

[HANDWRITTEN: UN DEC. BOX # 4911 RS # 2387 FILE # 3/55 3 JACKET # 3-8hw]

H.C. LAUERMAN.

[HANDWRITTEN: 801]
[HANDWRITTEN: 10/17/58]

— page 365 —
[STAMP: UNCLASSIFIED]
S.S. CABRILLA (SS288) Mark 27 Torpedo Attack No. 1 Patrol No. 8
Time 1326(I) Date 29 July 1945 Lat. 8°-38'S Long. 114°-51'E.
Sound Conditions Fair Depth of Water 150 fathoms
Distance to nearest shore or reef 4,000 yards. Sea Conditions Calm
Was it raining No

TARGET DATA - DAMAGE INFLICTED

Description: Two Sugar Dog type small cargo transports and one small trawler were
picked up by periscope at an estimated range of 12,000 yards. The
three ships were in a group but apparently not in a station. The
targets were tracked, using periscope ranges and bearings, on course
090°T, speed 6 knots. Visibility was good, sound conditions fair.

Ship Sunk: None
Ship Damaged: None
Damage determined by: No damage
Target draft 5 feet (approx.) Course 095°T Speed 6 knots Range 1500 yards at firing.
How long after launching torpedo was target heard? 19 minutes
Distance and time of target's closest approach to launching point 500 yards, 10 min-
utes after firing
Other noise sources: Reef noises were loud and continuous throughout the attack. The
torpedo tube was vented three minutes after torpedo was launched.
Target turn count: 220 RPM's Target bearing at firing instant 320° (Relative)
Give any particulars noted in targets sound output: The only noises heard from the
target were from its light, fast
screws.

OWN SHIP DATA

Speed 2 knots Course 340°T Depth 170 feet Angle 3° rise

FIRE CONTROL AND TORPEDO DATA

Was target aware of submarine's presence? No Was submarine being depth charged? No
Type attack: The targets were tracked on the TDC using periscope ranges and bearings.
With range 4,000 yards, angle on the bow 15° starboard, and distance to
target track 1000 yards, Cabrilla went to 170 feet. At this time target
screws could be heard plainly by sound. The TDC was kept running and

- 1 -
[STAMP: UNCLASSIFIED]

— page 366 —
T-O-P. S-E-C-R-E-T

the torpedo was launched when the generated range closed to 1500
yards; distance to the track 200 yards. Although sound had not
yet reported the target "in range" the set-up on the TDC indicated
that we had reached a very favorable firing position.
Sound did not report the target in acoustic range until 8 minutes
after the torpedo was launched. Screw noises were loudest 10 min-
utes after launching time.
A post analysis of the problem indicates that the torpedo was
launched too soon. Although we knew that the target was not with-
in acoustic range when the torpedo was launched, we felt certain
that it would be a matter of only a few minutes before the noise
from the target would be sufficiently strong to "home" the torpedo.
The error in the solution as indicated by the TDC was due either
to targets changing course after the last observation, a mistake
in the estimate of angle on the bow, or an underestimate of tar-
gets range.

Time of firing: 1326(I) Tube number 7 Time of hit None heard Erratic Unknown
JP decibel meter indication at firing 5db above noise level.
JP decibel meter indication 1 minute after firing 5db above noise level.
JP decibel meter indication 2 minutes after firing 6db above noise level.
JP Gain 3.5 Filter Band 3000 Mark torpedo 27 Serial number 237
Mark warhead ______ Serial number 155 Mark exploder 2 Serial number 1736
arming distance set 100 feet Issuing activity Submarine Base, Midway, T.H.
Comment: No difficulty was experienced in the upkeep of the three Mk. 27 torpedoes
carried on patrol. Instruction given at the Mk. 27 torpedo shop at Mid
together with the pamphlet furnished was adequate in performing the
routine work required.

- 2 - ENCLOSURE (A)

— page 367 —
[HANDWRITTEN: P16-30-46]
[HANDWRITTEN: -7-66]

UNITED STATES NAVY
FE24-71/A16-3
Serial 00114-A
[STAMP: AUG 27 10 35 1945]
22 August 1945.

[HANDWRITTEN: 2164 A 871]
[HANDWRITTEN: 12/hr]

[STAMP: S E C R E T]
SECOND ENDORSEMENT to:
USS CABRILLA Top Secret
Ltr., reclassified as
Secret.

From: The Commander Submarines SEVENTH FLEET.
To: The Commander in Chief, UNITED STATES FLEET.
Via: The Commander SEVENTH FLEET.

Subject: U.S.S. CABRILLA (SS288) - Top Secret Report of
         Firing Mark 27 Torpedoes, Patrol Number Eight.

Enclosure: (A) Subject Report.

1. Enclosure (A) is forwarded herewith.

JAMES FIFE.

DISTRIBUTION:
Cominch (2) ComSubsLant (2)
CNO (2) ComSubs7thFlt (2)
CinCPac (2) All Squad. Coms (1)
ComSubPac (2) All Div. Coms (1)
ComSubPacAdCom (2) BuOrd (2)
ComSubTrainPac (2) BuShips (2)
CO USS CABRILLA (1 copy of endorsement only)

[HANDWRITTEN: 1.3.7.17.66]
[SIGNATURE: T. B. MILLER]
Flag Secretary.

[STAMP: DECLASSIFIED]

— page 368 —
END OF REEL [HANDWRITTEN: AR-5381]
JOB NO. [HANDWRITTEN: E-128]

|||||1.0 |||||2.8 |||||2.5
|||||3.2 |||||2.2
|||||3.6 |||||2.0
|||||4.0 |||||1.8
|||||1.1
|||||1.25 |||||1.4 |||||1.6

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[LOGO: DEPARTMENT OF DEFENSE, UNITED STATES OF AMERICA]

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION