U.S.S. TUNA (SS-203) — war patrol report SS-203_TUNA_Part2.pdf

— page 1 —
12 May 1943.

0800 K Underway from alongside U.S.S. FULTON.
1019 Commenced sound test.
1155 Completed sound test.
1220 Tested 5" 51 calibre gun, six rounds at towed target.
1530 Anchored vicinity. Caloundra Head near Pilot vessel.
2235 Rendezvou with escort, HMAS GOULBURN, underway and proceeded out swept channel.

Distance run 62 miles. Fuel expended 1003 gal.

13 May 1943.

0220 Exchanged recognition signals with USS DRUM.
0540 Submerged on course 068 T. for trim dive.
0822 Surfaced.
0800 Submerged, commenced training exercises with escort.
1045 Made deep submergence - 275 feet - no bad leaks.
1144 Surfaced.
1554 Completed training exercises with escort.

1200 Position: Lat. 26-45 S., Long. 155-10 E.
Distance run 198 miles. Fuel expended 2350 gal.

14 May 1943.

0604 Submerged for training.
0825 Surfaced.
0825 Submerged for training.
0835 Surfaced.
1917 Submerged for training.
1926 Surfaced.

1200 Position: Lat. 22-40 S., Long. 156-19 E.
Distance run 294.3 mi. Fuel expended 3522 gal.

— page 2 —
15 May 1943.
0828 K Submerged for training.
0637 Surfaced.
1055 Submerged for training.
1111 Surfaced.

1200 Position: Lat. 17-48 S., Long. 155-55 E.
Distance run 293 miles. Fuel expended 3628 gal.

16 May 1943.
1130 Submerged.
1740 Surfaced.

1200 Position: Lat. 13-03 S., Long. 157-22 E.
Distance run 205 miles. Fuel expended 2508 gal.

2044 Received dispatch ordering us to run south of
19 North and west of 145° East via points 3 -
neutral lane and south of Musasu - Manus line.

17 May 1943.
0451 Submerged.
1808 Surfaced.

1200 Position: Lat. 10-04 S., Long. 157-12 E.
Distance run 187 mi. Fuel expended 1371 gal.

18 May 1943.
0502 Submerged.
1830 Surfaced.
2100 AIRCRAFT CONTACT NO. 1. Lat. 7-39 S., Long.
155-11 E. Salt Dog radar contact, distant 12
miles. Submerged.
2125 Surfaced.

1200 Position: Lat. 8-22 S., Long. 155-20.5 E.
Distance run 173 mi. Fuel expended 1214 gal.

Received dispatch ordering TUNA to stay north
of Musasu - Manus line en route area.

(7)

— page 3 —
0416 K
1838
2228
19 May 1943.
Submerged.
Surfaced.
CONTACT NO. 1. Lat. 5-20 S., Long. 153-54 E.
Torpedo wake crossed 50 yards ahead of ship,
about 130 starboard track. Believed to be submarine torpedo fired by submerged submarine on
moonlight patrol. Avoided with: full rudder and
emergency speed.

1200
Position: Lat. 3-14.5 S., Long. 154-00.5 E.
Distance run 163 miles. Fuel expended 1454 gal.

20 May 1943.
0152
CONTACT NO. 2. Lat. 4-28 S., Long. 153-53 E.
Sighted two patrol boats bearing 080 T., distant four miles headed toward this vessel.
Submerged. Nothing heard on sound. On coming
to periscope depth about an hour later, nothing
in sight. Remembering GREENLING's contact in
same spot, decided to remain submerged.

1842
Surfaced.

1200
Position: Lat. 4-09 S., Long. 153-55 E.
Distance run 139 miles. Fuel expended 1236 gal.

21 May 1943.
0317
Submerged.
1840
Surfaced.

1200
Position: Lat. 2-13 S., Long. 152-44 E.
Distance run 150 miles. Fuel expended 1504 gal.

22 May 1943.
0036
CONTACT NO. 3. Lat. 1-10 S., Long. 151-13 E.
Sighted a submarine believed to be GROWLER
bearing 181 T., distant: 9000 yds, course 290,
speed 13.

— page 5 —
0515 K Submerged.
1921 Surfaced.

: 1200 Position: Lat. 0-20 S., Long. 141-00 E.
    Distance run 92 mi. Fuel expended 380 gal.

: 0530 Submerged.
1927 Surfaced.

: 1200 Position: Lat. 0-07.5 S., Long. 139-31 E.
    Distance run 93 mi. Fuel expended 370 gal.

: 0530 Submerged.
1919 Surfaced.

: 1200 Position: Lat. 0-11 S., Long. 140-31 E.
    Distance run 97 mi. Fuel expended 371 gal.

: 0530 Submerged.
1912 Surfaced.

: 1200 Position: Lat. 0-11 S., Long. 142-12.5 E.
    Distance run 98 mi. Fuel expended 398 gal.

: 0515 Submerged.
1910 Surfaced.

: 1200 Position: Lat. 0-05 S., Long. 143-03 E.
    Distance run 98 mi. Fuel expended 390 gal.

— page 6 —
0540 K Submerged.
1831 Surfaced - sighting nothing in this part of area, decided to patrol off the coast to intercept any traffic being run on a dog-leg route.

1200 Position: Lat. 0-12 S., Long. 142-07 E.
Distance run 155 mi. Fuel expended 1521 gal.

2 June 1943.

0400 Submerged.
0721 CONTACT NO. 4. Lat. 1-30 S., Long. 138-52 E. Sighted vessel berthing 308 T., distant 8000 yards. Poor visibility. Appeared at first to be a medium AK on course 100 T. Commenced attack.
0739 Vessel appeared to be decoy patrol boat. Estimated to be 700 tons, 200 ft. long.
0742 Vessel identified as camouflaged launch, 80-100 ft. long, fake masts fore and aft and fake bridge structure main disguise. Seen standing on disguised bridge. Sound identified high speed motor boat screws. Broke off attack.
1930 Surfaced.
1200 Position: Lat. 1-15.5 S., Long. 138-51.5 E.
Distance run 152 mi. Fuel expended 1145 gal.

3 June 1943.

0524 Submerged.
1943 Surfaced.
1200 Position: Lat. 1-11 S., Long. 138-52.5 E.
Distance run 76 mi. Fuel expended 365 gal.

— page 7 —
0522 K Submerged.
1939 Surface.d.

: 1200 Position: Lat. 1-22°S., Long. 139-21.5 E.
Distance run 95 mi. Fuel expended 376 gal.

: 0524 Submerged.
1927 Surface.d.

: 1200 Position: Lat. 1-12 S., Long. 139-32 E.
Distance run 98 mi. Fuel expended 374 gal.

: 0515 Submerged.
1920 Surface.d.

: 1200 Position: Lat. 1-34.5 S., Long. 140-34 E.
Distance run 101 mi. Fuel expended 385 gal.

: 0517 Submerged.
1910 Surface.d.

: 1200 Position: Lat. 0-19.5 S., Long. 140-37 E.
Distance run 98 mi. Fuel expended 435 gal.

: 0530 Submerged.
1928 Surface.d.

: 1200 Position: Lat. 0-51 N., Long. 140-19 E.
Distance run 99 mi. Fuel expended 400 gal.

8. Page number: 9

— page 9 —
14 June 1943.
0452 K Submerged.
1927 Surfaced.

1200 Position: Lat. 0-01 S., Long. 139-33 E.
Distance run 103 mi. Fuel expended 365 gal.

15 June 1943.
0556 Submerged.
1928 Surfaced.

1200 Position: Lat. 0-00., Long. 139-43 E.
Distance run 101 mi. Fuel expended 420 gal.

16 June 1943.
0547 Submerged.
1927 Surfaced.
2330 Received dispatch ordering us shell Wake and
thane south of Focklington by June 26. Decided to do this in moonlight of seventeenth.
Looked like good weather for following day.

1200 Position: Lat. 0-05 S., Long. 140-49 E.
Distance run 100 mi. Fuel expended 305 gal.

17 June 1943.
0500 Submerged.-- closing Wake - decided to close
to 7000 yards after surfacing and shell from
the northeast.
2001 Surfaced - moon about two hours high - closing
ing Wake on two engines.
2010 Coast obscured by haze - decided to wait until moon was higher. Changed course to 070.
2016 CONTACT NO. 5. Lat. 1-52 S., Long. 139-04 E.
Sighted two subchasers, distance 2000 yards,
bearing 010 T. - Submerged. Do not know whether we were sighted but believe we were.
Tracked screws for two hours on course 105 T.
and reverse. Believe these boats were making
dusk patrol from Wake.

10.

— page 10 —
2200 K
Surfaced in driving rain. Thought we ought to head down coast for a day before returning.

1200 Position: Lat. 1-29 S., Long. 139-07 E.
Distance run 153 mi. Fuel expended 1400 gal.

18 June 1943.

0508 Submerged.
0905 CONTACT NO. 6. Lat. 1-42 S., Long. 140-56 E.
Sighted two small patrol vessels bearing 224 T., distant 7000 yards - making for Wakde.
After seeing these, deemed it prudent to have at least three or four days to observe the patrols of Wakde prior to any attack. In view of orders to be south of Focklington by twenty-sixth, abandoned any further attempt.
1135 Lat. 1-43 S., Long. 141-09 E. Sighted derelict bearing 118 T., distant 3.5 miles, apparently an abandoned 20-30 ton fishing boat.

1920 Position: Lat. 1-43 S., Long. 141-10 E.
Distance run 202 mi. Fuel expended 2640 gal.

19 June 1943.

0455 Submerged.
1913 Surfaced.

1200 Position: Lat. 2-20 S., Long. 143-41 E.
Distance run 154 mi. Fuel expended 1695 gal.

20 June 1943.

0156 Sent second dispatch advising no action against Wakde and intent to transit Vitiaz Strait on 21 June.

0451 Submerged.
1903 Surfaced.

1200 Position: Lat. 3-12 S., Long. 145-12 E.
Distance run 165.5 mi. Fuel expended 1605 gal.

— page 11 —
21 June 1943.
0535 K. 1847
1200
22 June 1943.
0425
1840
1200
23 June 1943.
0515
1821
1200
24 June 1943.
0500
1430
1804
1200
25 June 1943.
1830
1200
12.

— page 14 —
2228K 5-19 5-20S 153-54E
(Torpedo wake crossed fifty yards ahead of us, about 130 starboard track, probably from submarine.)

: 0152K 5-20 4-36S 153-53E 240T 8000
(Two small patrol craft.)

: 0036K 5-22 1-10S 151-16E 30CT 13 9000
(A submarine. Possibly USS GROWLER.)

: 0721K 6-2 1-30S 138-52E 100T 8 7000
(One small camouflaged patrol craft.)

: 2016K 6-17 1-52S 139-04E 100T 8 7000
(Two small patrol craft.)

: 0950K 6-18 1-24S 140-56E 290T 7 8000
(Two small patrol craft.)

(g) DESCRIPTION OF ALL AIRCRAFT SIGHTED.

CONTACT NO. 1: Lat. 7-39S, Long. 155-11 E., distant 12 miles. 3D radar contact.

CONTACT NO. 2: Lat. 9-43 S., Long. 155-42 E., patrol plane distant eight miles, bearing 024 T.

(h) PARTICULARS OF ATTACKS.

None.

15.

— page 15 —
1. Anti-submarine measures.
   - There is evidence of Japanese submarine moonlight patrols between Cape St. George and Henpan. Also, it is believed an anti-submarine group works out of Green Islands or Fenli.

: 2. Major defects experienced.
   - MK II T.D.C.
   - On 25 May, while running a drill problem on the T.D.C., the range could not be increased. Examination showed that either a gear must be binding in the range train or some loose part was jamming the gear.
   - Nothing could be determined upon examining T.D.C. after removing all side plates. Four 5/8" rods 12 inches long were manufactured and threaded to replace the generator mechanism holding bolts and the generator mechanism was withdrawn from the case. A bracket on shaft 3521 (Ordnance Dwg. 194201) was found to be loose and the cause of the trouble. Bracket was secured and generator replaced. After replacing generator mechanism, computer mechanism was found to be receiving false R, A, Co and S components. Five days were required to readjust the T.D.C. accurately enough for it to pass the "A" and "G" tests.

: 3. Remarks.
   - 1. Enemy Mine Sweeping Procedures:
     - None observed.
   - 2. Degaussing Arrangements and Redares:
     - None observed.

(2)

— page 16 —
01020

CONFIDENTIAL.

(k) REARKS

3. Own Radio Reception:

Reception on 5600 and 8370 kcs. was good except during occasions of deliberate interference. Several times, particularly on the 1100 and 1300 Zebra submarine schedules, an interfering station would swing his master oscillator back and forth making long dashes, thus blocking out a wide band.

The following serials were missed:

27, 9 and 15.

Last serial received: 36
Last serial sent: 250810.

4. Density Layers and Sound Conditions:

No density layers were encountered. Sound conditions were good to excellent.

5. Habitability and Health:

Good.

The following cases were admitted to the binnacle list:

1 Tonsillitis 2 days.
1 Cellulitis 3 days.
7 Fungus Infection
1 Infected Wisdom Tooth 2 days.
1 Boils

6. Endurance Factors:

Torpedoes24.
Fuel13,000.
Fresh Water and
Battery watercapacity.

A. H. HOLTZ.

17.

— page 17 —
7 01020
FC5-8/416-3
Serial 077
CONFIDENTIAL

FIRST ENDORSEMENT TO
CO TUNL Report of
Seventh War Patrol.

From: Commander Submarine Squadron HIGHIT
To: Commander Task Force SEVENTY-TWO

Subject: U.S.S. TUNL (SS203), Seventh War Patrol;
Comments on.

1. The seventh war patrol of the TUNL was of forty-seven days duration, of which, thirty-four days were spent in areas where enemy vessels might be encountered. None of her six contacts were with suitable torpedo targets. Bad weather and consequent poor visibility no doubt contributed to the scarcity of contacts.

2. Except for the T.D.C. casualty, which was ably repaired by the ship's force, TUNL experienced no major defects during this patrol. Her general condition is such that she will be ready for her eighth patrol at the end of a normal refit period. TUNL will be refitted by the Submarine Repair Unit, assisted by the TULTOI. During the current refit the bridge structure will be cut down and an additional 20 mm gun installed forward.

3. The morale and general health of the officers and crew appeared to be excellent.

J. C. RAIN,
Acting.

— page 18 —
7 01020
Serial: 0219
CONFIDENTIAL
June 29, 1943.

2nd ENDORSEMENT to
CO TUNA Report of
Seventh War Patrol.

From: The Commander Task Force SEVENTY-TWO.
To: The Commander in Chief, UNITED STATES FLEET.
Via: (1) The Commander, SEVENTY-FLEET.

Subject: U.S.S. TUNA (SS203), Seventh War Patrol;
comments on:

1. TUNA left Brisbane May 12, 1943, on her Seventh War Patrol. During the evening of May 19th while running on the surface west of BUNA in bright moonlight a torpedo was fired at her by a submerged enemy sub. The following morning she sighted two patrol boats heading in her direction and evaded by submerging. On the morning of May 22nd she sighted a submarine believed to be friendly. A vessel which was first believed to be a German submarine identified as a camouflaged launch too small to warrant disclosing position by attacking. Two subchasers were sighted the night of June 17th in the vicinity of WADE Island while TUNA was endeavoring to obtain a position to shell this island. The following morning the presence of these subchasers again frustrated the bombardment of WADE. TUNA started her return to BRISBAU via VITIAZ STRAIT on June 18th, and arrived June 28th, 1943.

2. The entire patrol, except for the period of transit, was spent off the North New Guinea coast west of 14.5°C East Longitude and south of 1° North Latitude. TUNA is considered to have covered this area efficiently. Unfortunately no attack opportunities were presented. During this same period FINBACK was stationed off BELUAS. Her outstanding record of over 40,000 tons of shipping sunk or damaged no doubt had much to do with the lack of targets in TUNA's area. Reduced visibility experienced throughout the major portion of the trip, plus lack of targets combined to make this patrol disappointingly unproductive. It is intended to leave this area vacant until availability of air reconnaissance incurs more fruitful occupation.

— page 19 —
7 01020
FF12-15(72)/A16-3/Tk
Serial 0219
CONFIDENTIAL
Subject: U.S.S. TUN (SS203), Seventh War Ietrol;
corrections on.

3. TUNA inflicted no damage on the enemy during her Seventh War Fetrol.

JAMES LIFE.

DISTRIBUTION:
Cominch (Advance copy)(2)
VCNO
Com 1st Flt.
Com 2nd Flt.
Com 3rd Flt.
Consubs 1st Flt.
Consubs 2nd Flt.
Consubs 7th Flt.
All SS TF-72 (Not to be taken to see - BURN)
CTF-72 War Fetrol, Summary and Best Files).
CSS 6 & 8,
CSD 81 & 82.
Oinc, S/M School, N.I. Conn. (2).
CO TUNA (File).

— page 20 —
1. Forwarded.

H. W. GRAF
Chief of Staff

20 JUL 1943

Copy to:
Vice OMAV

[Handwritten notes and annotations]

[Handwritten notes

— page 21 —
64585 FILMED

Fleet Post Office,
San Francisco, Calif.
14 October, 1943.

DECLASSIFIED-ART. 0445, DFW/1/

— page 22 —
1. USS TUNA - Report of Eighth War Patrol.

(A) PROLOGUE.

Returned from Seventh War Patrol to Brisbane Australia, on 28 June, 1943. Refit accomplished by Submarine Repair Base and U.S.S. FULTON; completed on 12 July, 1943. Readiness for sea 19 July, 1943. Conducted 5" gun firing and sound test on 20 July, 1943, proceeded to sea in company U.S.S. COUCAL and SILVERSIDES, U.S.S. GROWLER joining later, for six days training enroute fueling point inside Jomard Entrance.

Operation order directed this vessel proceed to East Coast Philippines, under CTF 71, and conduct unrestricted warfare in Philippine Area.

Completed training exercises of Jomard Entrance, passed through Jomard Entrance and refueled from U.S.S. COUCAL, on 27 July, 1943. After taking 13,000 gallons of fuel oil, proceeded north of Misima Island and East of Laughlin Island for Vitiaz Strait.

At 1935 K 29 July, 1943, North of Woodlark Island, Lat 8°02'8" Long 156°09'1", while running on the surface, a plane dropped an illuminating flare about three miles off port beam. Submerged to deep submergence. While passing from 70 to 110 feet four depth charge explosions badly shook ship. Conning tower door started to leak badly, later closed with pressure. Ship was not yet rigged for depth charge attack. On second explosion lost all main and auxiliary power. Shifted to hand on bow and stern planes. Power restor-ed between 200 to 250 feet. By blowing and backing emergency, a descent was arrested at 355 feet. On the way up, hydraulic system failed and vents weren't opened in time to prevent broaching, so surfaced. Ship had 180 port list, conning tower door leaked badly, and batteries had full voltage grounds. When about to open up with our 20MM, plane was identified as friendly.

— page 23 —
U.S.S. TUNA - Report of Eighth War Patrol.

Major damage to both periscopes, #2 turbo blow, conning tower door, all main vent gaskets, and upper JK cylinder head, plus much minor damage caused our decision to return to Brisbane. Arrived Brisbane, 4 August, 1943. 4-11 August engaged in repair. 12-14 August dry docked for inspection and test.

Prior test dive 16 August, new turbo blow bearings burned out, on test.

16-19 August, 1943, engaged in training exercises with U.S.S. DRUM and BOWFIN, plus escort vessels, while tender reorganized new bearings. 20 August 1943, replaced #2 turbo blow with new impeller and new bearings. On 21 August, 1943, proceeded to sea.

Operation order directed this vessel to proceed through Grafton Passage, inside the Barrier Reef, through Torres Strait to Darwin and report for duty to CTF 71 representative. A coast pilot, Gerald R. Bruce, was provided for the inside passage and transit of Torres Strait.

(B) NARRATIVE.

(Note: All times zone HOW unless otherwise indicated.)

Aug 21
1725 K Took departure from Cape Moreton Light. Proceeded north of Suarez Reef, South of Flinders Reef, through Grafton Passage, entering latter passage at 0700 K, 24 August, 1943.

Aug 25
1100 K Completed transit of Torres Strait and dropped pilot.

Aug 28
1530 K Met escort at entrance swept channel, Darwin. CTF 71 representative boarded us.

— page 24 —
U.S.S. TUNA - Report of Eighth War Patrol.

at anti-submarine boom with operation order directing us to proceed and patrol South China Sea area via Banda-Florae Seas, Makassar Strait, Sibu to Passage and Balabac Strait.

Received fresh water and 35,000 gallons fuel oil from dock.

Aug 29
0830 K Proceeded to sea.

Aug 30
Passed through Timor-Leti Passage. Sighted Leii Island in the morning and dove to make submerged avorroach to Passage. At this time the intent was to go through Saleler Strait avennd cne day off thet @strait numbered, one day patrol off Makassar, and 2 days patrol on the Mangkalihat-Moeara aejor run.

Aug 31
1045 Lat 6°52'5 Long 124°49'5 sighted smoke bearing 3140' proceeded to close on 3 engines. On sighting masts and stack of freighter, estimated angle on bow at 30 port - came to normal avroroach course 2250T.

1107 Submerged. Unable to pick up target while submerged. Decided angle on bow must have been 150 port instead of 20 port.

1209 Surfaced. But 3 main engines on, and resumed chase.

1255 Sighted smoke bearing 2800T. Proceeded to pass target to south for position ahead.

1310 Sighted target mast.

1343 Target zigged, apparently directly toward us. Submerged to avoid being detected. Again unable to pick up target while submerged.

1425 Surfaced and continued chase.

1447 Sighted smoke bearing 2870T. Plot and estimated destination of target led to the decision that target was on a base course from 2450 to 2650T, speed about 10 knots.

— page 25 —
1447: Continued on 3 engines to get around target, changing course South as necessary to avoid being sighted. Last sighted smoke at 1756.

: 2000: Changed course to 0550T and slowed to 1/3 speed. Intr-osting course determined from navigationl plot and mooring board.

: 2043: Lat 79081S Long 120051T contacted target on SJ at 15,000 yards bearing 0110T and commenced night surface approach, TDQ solution target. Speed: 2800T.

: 2101: Sighted target from bridge.

: 2109: Sighted second smaller vessel, apparent-ly an escort on near quarter of target.

: 2115: Fired 3 torpedoes scored 10 at 3400 yard range, 200 R gyro, 140 port track.

: 2116: Put rudder full left, increased speed to full on 4 engines to head away from target and escort. Target blew two blasts on whistle, turned toward, and commenced signalling to escort.

: 2120: Target turned large searchlight directly on tls vessel, illuminating us very clearly.

: 2121: Submerged to 250 feet, rigged for depth charge attack and all-nt running. On way down heard two explosions. 20 seconds apart that sounded like war head explosions. Believed they were torpedoes exploding at and of run.

: 2123: Sound could hear screws of both vessels distinctly.

: 2123: Heard three distant explosions about 20 seconds apart that sounded like death charges. Escort vessels were getting, continously weaker.

: 2132: Target screws faded out.

: 2145: Escort screws faded out.

: 2252: Surfaced in the hove of contacting target again in morning, decided to continue South-west end pass South of Kaleo Toa instead of passing through Seleier.

— page 26 —
1721
Let 7021's Long 120021' sighted masts bearing 9980T.
Submerged.
Masts identified as small sail boat.
Surfaced. SJ out of commission.

Sept 2
0518
Submerged.
Lat 5021's Long 118045' sighted mast of freighter bearing 0680T.
Unable to close. Broke off attack.
Proximity to Makassar and reef studded waters made a surface chase not feasible.
Surfaced.

Sept 3
Submerged patrol in vicinity of Cape William.

Sept 4
0314
Lat 00431's Long 118021' sighted small samoan bearing 0050' distant 6 miles.
Submerged.
Surfaced. Heading toward Mangkalahat-Noeara Major Lane.
Lat 00231's Long 118029' sighted small sail boat bearing 0100' distant 6 miles.
Submerged.
Lat 00281's Long 118029' sighted sampan bearing 0900' distant 5 miles.
Lat 00091's Long 118029' sighted 1000-1500 ton Sugar Charlie bearing 1180' distant 6 miles on course 2300' speed 9 1/2 knots.
Unable to close target. Broke off attack.
The target appeared to draw about 7 feet or less. In view of the small size of target the lack of a SJ, (Still out of commission), and the early moon-set, further attack considered to be not as important as remaining undetected on this valuable route in the hopes of getting larger game on the next two days.

— page 27 —
U.S.S. TUNA - Report of Eighth M.P. Patrol.

Sept 5
0130
Lat 0°41'N Long 118°50'W heard fast motor boat screw 0000' on'sound gear. Unable to see anything from bridge. Turned stern toward sound and opened out for five minutes. No further contact - resumed normal running.
0515
Submerged for petrol off Mangkalihat Point.
0603
Lat 0°43'N Long 119°10'E sighted small petrol boat dead in water bearing 0900' distant 6000 yards.
1015
Herd five distant explosions sounding like depth charges about 6-10 seconds apart, this fifth being definitely the loudest.
1020
Herd six more similar explosions the last being the loudest again.
1850
Surfaced and headed toward Sibutu Passage.

Sept 6
1353
Submerged to enorosh Sibutu passage undetected.
1858
Surfaced and completed transit of Sibutu Passage and Pearl Bank Channel.

Sept 8
0522
Submerged off Balabea Strait.
1930
Comleted transit of Belabea Strait. Noted large radio tower situated on hill west of Calandorang Bay Lat 08°00'N Long 117°03'30"E. SJ Radar back in commission.

Sept 9
0540
Submerged.
1903
Surfaced.
2100
Entered assigned area.

Sept 10
Spent day in submerged patrol off Miri. Hoved to establish position accurately and observe Miri tomorrow.
1918
Surfaced. Storm making up. Observation of Miri tomorrow improbable. Decided to proceed to vicinity of Natuna Island.

— page 28 —
U.S.S. TUNA - Report of Eighth War Patrol.

Sept 11

Enroute 'Miri to Natuna on surface - rain, high wind, heavy seas.

Sept 12-18

Patrolled across Tako - Singapore and Empire - Singapore routes. During these seven days, visibility was excellent both day and night - (full moon). No contacts, so decided to try the passages to the eastward of Natuna and Anambas Islands.

Sept 19-22

Submerged patrol to eastward of Natuna and Anambas Islands. No contacts.

Sept 23.

0200 G
Put four engines on to-head back across the Singapore-Emilie routes. Ran on surface all day.

1621 G
Submerged.

1831 G
Surfaced.

1929 G
Let 4291'N Long 105°02'I sighted large 'unidentified vessel one point on port bow, range 5000 yards on opposite course about 190°.

1932 G
Changed course to 0450T.

1934 G
Target zigged toward. Swung ship to right for stern shot.

1936 G
Target zigged to right to about original course.

1939 G
Fired four torpedoes stern shot at 1650 yard range, 30° port track, 180° average gyro angle.

1940 G
About 50 seconds after firing observed first torpedo explode at targets bow.

1941 G
Target apparently slowed. Went ahead full, gradually changing course to left for bow approach.

1942 G
Target increased speed.

— page 29 —
1949 G
Heard first dull heavy explosion. Could not ascertain source. Did not sound like torpedo or depth charge, but similar to boiler explosion. Target slowed slightly.
Target swung right and reduced speed. Noted several flashes along target main deck. Believing them gun flashes, submerged.
Heard second dull, heavy explosion. This was last contact with target. Target could not be heard by sound.
Surfaced. No evidence of target. Decided to head for routes south of Riflemen's Bank.

Sept 24-25
Submerged patrol enroute area south of Rifleman's Bank.

Sept 26-30
Submerged patrol south of Vanguard and Rifleman's Bank. No contacts. Over-clear at night poor - haze and overcast.

Oct 1-3
'Rac-ivad order to depart area by 1200 H, 2 October. Dd'd to head back down toward Miri, passing south of Luconia Shoals.

Oct. 4
0509 Submerged.
0549 Surfaced. Made surface transit of Pearl Bank channel.
1400 Submerged.
1829 Surfaced.
1913 Let 5000'N Long 119°37'1' sighted large sub chaser bearing 170°T distant 2000 yards on opposite course.
1914 Reversed course.

— page 30 —
1922
U.S.S. TUNA - Report of Eighth War Patrol.

1922
SJ contact at 11,000 yards bearing 1270T.
Believing this to be a large escorted
vessel, endeavor to get in position ahead.
Abov: SJ contact determined to be land.
Abandoned attack and proceeded to transit
Sibutu Passage.

Oct. 5.
Proceeding on surface toward Makassar
Strait.
Lat 2°55'N Long 119°29'E sighted U.S.
Submarine distant 7 miles bearing 1380T
on opposite course. Appeared to be petrol-
ing on surface at about 6 knots.

Oct 6.
0153
Lat 0033'S Long 118°55'E SJ contact on
five grounded targets bearing 2020T distant
6000 yards.
Reversed course and commenced tracking
at one third speed.
Lat 400 yards. Increased speed to get in
position ahead for daylight attack submerged.
Course and speed determined to be 0300T,
9.5 knots by TDY and vlot.
Submerged in position ahead of convoy.
Lat 0048'N Long 119°20'E heard single
distant aerial bomb explosion.
Surface-d. No contact of convoy by this
time led us to believe they were hugging
the coast. Decided to try to get ahead
of convoy in vicinity of Dondo Bay.
Lat 0041'N Long 119°34'E sighted two
Petes bearing 2350T distant 8 miles
elevation 15°.
Submerged.
Abandoned chase.
Surfaced.

1355
1634
1830

— page 31 —
10-14
Enroute Lombok to Freemantle.

(C) WEATHER
Weather corresponded closely to that predicted in 1001 pilots.

(D) TIDAL INFORMATION
(1) No current experienced in Lombok Strait.
(2) A fer current of .5 to .7 knots was encountered on the first transit of Salabar Strait and a fer current of 2.5 to 3 knots was experienced in the second passage of the strait.

(E) NAVIGATIONAL AIDS
None observed.

- 10 -

— page 32 —
1. Time & Date: 1045 H 30 Aug 6045
: 2. Time & Date: 2043 W 30 Aug 122051
: 3. Time & Date: 1000 H 2 Sept 118045
: 4. Time & Date: 1723 H 4 Sept 118026
: 5. Time & Date: 1929 G 25 Sept 105022
: 6. Time & Date: 1913 H 4 Oct 119037

Estimated Course and Speed:
: 10-15 miles, 2550 knots
: 15,000 yds., 2300 knots
: 18,000 yds., ---
: 12,000 yds., 2300 knots
: 6,000 yds., 1830 knots
: 13,500 knots
: 0300 yds., 9 knots

Estimated Course and Speed:
: 10 knots
: 10 knots
: ---

— page 34 —
U.S.S. TUNA - Report of Eighth War Patrol

(H) ATTACK DATA

U.S.S. TUNA -- Torpedo Attack No.1 Patrol No.8.
Time 2043 H. Date 31 August, 1943, Lat 7°08'18", Long 12°05'18".
Target Data.
3000 ton AK, well loaded, escorted by small corvette type escort.
Contact made at night by SJ radar after long daylight chase.
Visibility 8000 yards.
Ships Sunk - None.
Ships Damaged. - None.
Target draft - 20-24 feet. Course 360°T.
Speed 11.8 knots.
Range 3400 yards.

Own Ships Data.
Speed 16 knots. Course 280°T. Depth - surface. Angle 90° Right.
Night surface overcoach and attack by MD.
Original con-oat from SJ Radar at 15,000 yards aided by 7mm bearings from bridge after range
had closed to about 7500 yards. Escort on near
(port) quarter of target (not seen until we had
committed ourselves to high speed) and visibility
conditions caused decision to fire with high
track (140P) end long torpedo run 4000 yards
with 1° divergent spread. Solution on TDC seemed
very good. At time of firing third torpedo,
target burned toward (Left) and avoided
torpedoes. The commanding Officer realized
the range in this attack was excessive but
believes he would have been unable to close
target any more without being seen by the escort
which was between us and the target.

- 13 -

— page 35 —
15

U.S.S. TUNA -- Report of Eighth War Patrol.

Attack #1.

Tubes fired #3 #4 #5
Track angle 140P 139P 141P
Gyro angle 20R 19R 21R
Depth set 12' 12' 12'
Power High High High
Hit or Miss Miss Miss
Erratic No No No
Mark torpedo 14-3A 14-3A 14-3A
Serial number 25166 25160 23499
Mark exlolder 6-1 6-1 6-1
Serial number 9772 10782 6695
Actuation set Both Both Both
Actuation actual -- -- -
Mark "per Head 15 16 16
Serial number 1 1233 9713 1250
Explosive TPX TPX TPX
Firing interval -12 sec-15 sec-
Type serread 10 divergent
Sea conditions Calm - Extremely Phosbhorosecent
Overhaul activity U.S.S. FULTON.

U.S.S. TUNA.-- Torpedo Attack No. 2. Patrol No. 8.

Time 1939 6, 23 September, 1943. Lat 4°39'N Long 105°02'E.

Target Date.

Large unescorted unidentified ship.
Contact made at night visually from bridge.
Visibility 6000 yards.
Ships sunk - target, possibly.
Ships damaged - target.
Target draft - 16-24 feet, Course 1880T, Speed 13.5
Firing range - 1350 yards.

Own Ship's Data:

Speed 6, Course 159°T, Depth - surface, Gyro
angle 180° (average) run 1175 yards.

- 14 -

— page 37 —
U.S.S. TUNA - Report of Eighth War Patrol.

(L) RADIO
None.

(M) RADAR
SJ Radar was out of commission from 1 to 8 September 1943. Complete loss of picture on screen, no range unit output, no sync-nullse, high regulated rectifier voltage, no transmitted pulse, no sensitivity, no IF amplification, and poor horizontal sweep control.
Eight days were required to locate and remedy all causes of above defects. These causes included:
1. Defective GR tube.
2. Defective range-unit and range indicator circuit tubes.
3. Grounds in delay-tank leads.
4. Bad resistors in voltage-divider of horizontal sweep circuit.
5. Defective sweep-switch.

(N) SOUND GEAR AND SOUND CONDITIONS.
Good to excellent.

(O) DENSITY LAYERS
None observed.

(P) HEALTH, FOOD, AND HABITABILITY.
Good.

(Q) PERSONNEL.
The state of training and performance of duty under combat conditions of officers and enlisted personnel, was in general, excellent.

- 16 -

— page 38 —
17
U.S.S. TUNA - Report of Eighth War Petrol.

(R) MILES STEAMED - FUEL USED.

Port Darwin to area 2310 miles 17,100 gals.
In area 3140 miles 24,500 gals.
Area to Freemantle 2050 miles 41,050 gals.

(S) DURATION.

Days enroute Brisbane to Brisbane. (Dartrol interrupted by damage received from aerial depth charges). 14 days
Days enroute Brisbane to Port Darwin 7 days
Days enroute Port Darwin to Area 12 days
Days in Area 23 days
Days enroute Freemantle 12 days
Days submerged 35 days

(T) FACTORS OF ENDURANCE REMAINING.

Torpedoes Fuel Provisions Personnel Factor
17 11580 gals. 15 days 10 days

Limiting factor this patrol, Orders.

(U) REMARKS.

NOTE.

- 17 -

18

— page 39 —
16 October 1943.
SUBMARINE SQUADRON SIXTEEN.
PCS-16/A16-3
Serial (014)
FIRST ENDORSEMENT TO
TUNA 8th War Patrol.
Report SS203/A16-3
dated 14 October 1943.
CONFIDENTIAL
From: The Commander Submarine Squadron SIXTEEN.
To: The Commander in Chief, UNITED STATES FLEET.
Via: The Commander Sea Force SEVENTY ONE.
The Commander SEVENTY ONE.

Subject: U.S.S. TUNA - Report of Eighth War Patrol - Comment on.

1. The eighth war patrol of the TUNA covered a period of fifty-four days, including an overnight stop at DARWIN for fuel and patrol instructions. The route from BRISBANE to the patrol area in the vicinity of NATURA and ANAMBAS ISLANDS in the SOUTH CHINA SEA was via TORRES STRAIT to DARWIN in the THIAR STRAITS and the Northwest coast of BORNEo. Weather conditions prevented close reconnaissance of MIRI and the BORNEo COAST. Forty days were spent north of the BARIER, twenty-three of which were in the assigned patrol area. This area is considered to have been well covered. The TUNA got off to a bad start on this patrol by being bombed and severely damaged by a friendly plane, which necessitated returning to BRISBANE for a period of 17 days for repairs. The bombing also resulted in a very severe shaking up of personnel.

2. Of the eight contacts made with suitable targets, including two A/S vessels, two were developed into attacks. In the FLORES and NORTH of FLORES ISLAND on 31 August, after a ten and a half hour chase, three torpedoes were fired at a loaded 3,000 ton escorted freighter in a night surface attack. A track angle of 140° and firing range of 3400 yards with a 200 gyro angle resulted in a torpedo run of 4000 yards and all missed. Submarine to 250 feet to escape expected counterattack by the escort and remaining at this depth for an hour and a half resulted in loss of contact which unfortunately was not regained. On 23 September, northwest of ANAMBAS ISLANDS, in a night surface attack, ten minutes after sighting, four torpedoes from stern tubes at an unscattered 8,000 ton transport on a 30 degree track with zero gyro angle at an average range of 1650 yards. One hit was observed in the bow. Thirty-six minutes after firing, flashes along the target's deck were assumed to be gunfire and TUNA submerged. Upon surfacing fifty minutes later, target could not be located.

— page 40 —
3. The material condition of TUNI on return from patrol was above average compared with other submarines of Squadron SIX. It is evident that ship's force during patrol devoted considerable time to the proper care and routine maintenance of equipment. Some of the routine maintenance normally accomplished by the tender during the 'refit period had been completed by ship's force prior to entering port. There were no major defects and the refit will be accomplished by PELLAS during the normal two weeks period assigned. Docking will not be required.

4. The commanding officer, officers and crew of TUNI are congratulated on damaging an 8,000 ton enemy transport.

[Signature] J. M. Haines

— page 41 —
12-1cs
FE24-71/AI6-3
Serial 0857
20 October 1943

C-O-N-F-I-D-E-N-T-I-A-L
SECOND INDIRECTORY TO
USS TUNA Eighth War Patrol
Report 53203/AI6-3 dated
14 October, 1943.

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

Subject: U.S.S. TUNA Report of Eighth War Patrol - Comment on.

1. The remarks of the Commander Submarine Squadron SIXTEEN are complete and, in general, are concurred in. It is to be noted, however, that of forty days spent south of the MALAY MARINE a total of thirty-five days were spent submerged. While the areas patrolled were narrow generally travelled traffic-lanes, it is believed that, in view of the wide lanes in the SOUTH CHINA SEA and little probability of air attack, surface running with high periscope watch would have resulted in more effective area coverage.

2. In view of the fact that the TUNA was unable to give any definite indications as to identity of the vessel damaged on the second attack, damage is assessed in accordance with the standards set forth in the Division of Naval Intelligence Table J-II, page 3, which allows 4000 tons for unidentified freighters and transports.

3. This patrol is not considered "successful" for purposes of awarding the Submarine Combat Insignia.

4. The TUNA is credited with having inflicted the following damage on the enemy:

FILMED

— page 44 —
1943, arrived Freemantle, from eighth patrol. Refitted by U.S.S. PELLAS. 14 - 28 October. On 29 October 1943, Commander J. T. Ward, U.S.N., relieved Lieutenant Commander A. H. Holtz, U.S.N., as Commander Officer. '30 October - 6 November ran engaging range, made deep dive, fired three exercise torpedoes, and five rounds 5' during training exercises with U.S.S. ISABEL, Wm. B. PRESTON, HMNS VAN GALEN, and HMS NIZAM.

(B) NARRATIVE.
(NOTE: All times HCM unless otherwise stated.)

Nov 7
1300 Deported Freemantle, Consubid 62 on board, in accordance with CTF 71-1 0d Order 39-43.
1520 Rendezvous with HMNS VAN GALEN, for training exercises in Submarine Sanctuary.
1900 Deported exercise area along bombing restriction lane in company with HMNS VAN GALEN, conducting tracking and attack exercises enroute.

Nov 8
Continued exercises with HMNS VAN GALEN.
1130 Released HMNS VAN GALEN.
1200 Position 2946'15 1130'15".

Nov 9
2500 Made trim and training dive to 200 feet.
0540 Surfaced.
1200 Position 2446'15 1120'15".

— page 45 —
10 Nov 10
: 0900 Entered Xmouth Gulf.
: 0908 Mounted sternboard side to S3 ONDINA.
: 1730 Unmanned for patrol area after receiving 10,160 gallons of fuel oil.

Nov 11
: 0500 Not a turn roll during two 000 feet.
: 0528 Surfaced.
: 1000 Position 15007's 1160/17.

Nov 12
: 0800 Made trim hull training live to 500 feet.
: 0342 Surfaced.
: 1200 Position 16056's 1160/17.

Nov 13
: 0435 Submerged - commenced transit of Lomook Strait.
: 1200 Position 8°24'S 1160/17.
: 1325 Lat 8°20'S Long 1160/17. Sighted patrol craft bearing 0150's distant 4 miles - heading towards us. Sea was, glassy. Went deep and ran silent.
: 1510 Returned to periscope depth.
: 1520 Sighted patrol craft again - went deep and ran silent.
: 1530 Patrol craft passed overhead.
: 1530 Returned to periscope depth, rigged for normal running.
: 1842 Completed passage of Lombok Strait - surfaced.

Sighted numerous fishing craft during night - maneuvered to avoid.

- 2 -

— page 46 —
0916. Submerged.
1200. Position 52015 1170151T.
1529. Surfaced - ran Northwest toward
Pulu Laut.
2141. Sighted small craft bearing 1700
true distant 5000 yards - maneuvered
to avoid.

Nov 15.
050E. Submerged on Soring - Ballkopen
truck.
1200. Position 45015 1150301T.
1756. Surfaced - ran down to petrol
Surebay - Kendari lane.

Nov 16.
0536. Submerged.
1200. Position 60115 1140301T.
1859. Surfaced.
Sighted three sail boats during
the day.

Nov 17.
0500. Submerged off Surebay Strait.
1200. Position 65015 1130151T.
1515. Sighted buoy with flag 60115
112018T. This buoy appeared similar
to one previously reported by THESSER,
in approximately the same position.
Plane Contact #1.
1518. Let 60115 Long 1130151T. Sighted one
"Neto" bearing 1250 distant 4 miles
elevation 20°.
1918. Surfaced.
Sighted en unusual number of fishing
craft during day. Some et enchor,
others under sail. Twenty-one by
count were in sight at one time.

— page 47 —
0737 Stopped end investigated two fishing boats. Boats were similar, two "masted"; 70 ft. vessels with fore and aft rig, menn-d.by Malay-natives. There were no signs of unneutral servicen being performed by these natives. Depressed candy and canned beans to natives of one boat to alleviate their discomfort and fear.
: 1200 Position 6300's 113°16'1".
: 1300 Submerged.
: 1435 Surfaced.

Numerous fishing vessels sighted during the night.

: 0750 Shto Contact #2.
: 0910 Estimated course 0450°.
: 0930 Abandoned attack. Vessel was small 500 ton ferry with canvas canopy similar to one previously reported in this area by FINBACK. It was probably on Retavia-Bandjarmasin run. Least range 7000 yds. Vessel seemed too small to risk disclosure and compromise of opportunities.
: 1100 Position 5309's 112°44'1".
: 1854 Surfaced. Decided to patrol off coast of Java. Southwest of Parawan Islands. Sighted numerous fishing craft during night.

— page 48 —
0605
: 0730
: 1200
: 1209
: 1615
: Nov 21
: 0150
: 0214
: 0255
: 0300
: 0430

Ship Contact #3.
Lat 6015'13.1314"E. In heavy rain, aided by lightning flash, sighted medium size AK bearing 3100 distant 10,000 yards. At this time and all during the subsequent attack a blinding rain prevented any further visual sighting of the target.
Battle stations. Coached radar on and commenced tracking target.
Determined course to be about 1700 yards. Commenced the approach.
Using radar bearings fired four torpedoes at target with average range of 1100 yards. 63 seconds later heard and felt one torpedo explode. Turned away to avoid possible escort picked up by SJ radar. Smoke from target seen through lightning flash now observed as if ship was on fire. No flames were seen.
Maneuvering to obtain a second attack position. Numerous fishing vessels and heavy rain made this impossible. Searched and dodged fishing boats until 0430 but unable to regain contact. Heavy rains continued. It is possible that what was thought to have been fishing vessels or an escort vessel.

— page 49 —
0435
: 0720
: 1200
: 1616

: 0548
: 0704
: 1200
: 2200
: 2400

: 0829
: 1200
: 1600

: 0855
: 1200
: 1545

: 0509
: 1200
: 1806

: 0556
: 1200
: 1405
: 1813

: 0509
: 1200
: 1806

: 0556
: 1200
: 1405
: 181

— page 50 —
0452 Submerged.
0545 Surfaced to patrol.
1150 Submerged.
1200 Position 70°56'15" 125°00'10".
1404 Surfaced to patrol.
Ship Contact #4.
1624 Lat 70°46'15" Long 125°00'10". Sighted smoke bearing 3500, which was later determined to be two smoking shios on approximate course 2600. Continued tracking westward until dark.
1900 Battle stations - Commenced attack. Convoy determined to be two AK with one escort.
1926 At range of avroarmatively 5000 yards discovered by escort who turned search-light on us. Submerged. (Frequent sheet lightning in our background probably disclosed our presence.)
1933 8 depth charges. Sounded large but not too close.
1946
2030 Lost contact with escort.
2151 Surfaced and commenced chase.
2305 Lat 70°44'15" Long 125°00'10". Suddenly sighted patrol craft bearing 1300 distant 6000 yards which dropped two depth charges. Put stern toward vessel and ran at high speed. Believed to be escort of shio contact #4.
2322 Lost contact with escort and resumed chase.

Nov 28
0132 Lat 70°36'15" Long 125°00'10". Sighted unidentified vessel believed to be one of the previously contacted patrol craft. Reversed course.

— page 51 —
0640 Submerged to evade as our position which was near Mariane Reef was not well known.
0700 Sighted most bearing 1630T.
0715 Mast identified as patrol craft similar to our 50 type ships. This vessel headed for our opposition came within 3000 yards before reversing course and disappearing at high speed. His propeller were heard once by the sound operator.
1116 Surfaced.
1200 Position 7051's 120°22'w. Decided to patrol Selleri Strait - Buton Strait track, and at Set course for that area.
1230

NQV 29

0420 Submerged off entrance to Buton Strait.
0850 Plane Contact #3.
1200 Position 5050's 122°03'w. Sighted one flying boat bearing 308°T distant 5 miles. Unable to determine number of engines.
1225 Position 5050's 122°03'w. Sighted masts of large AK bearing 063° True distant 10 miles. Commenced approach. After second look an escort was discovered ahead of the AK.
1350 Abandoned attack - least range 7500 yards. Trailed at 2/3 speed with intention to close after dark.
1300 Lat 5046's Long 121°48'w. Sighted PC type escort bearing 264°T distant 8000 yards. Changed course to avoid. Believed to be escort of ship contact #6 returning to Tiora or Buton Strait.
1910 Surfaced. Commenced chase.
2045 Abandoned attempt to close as did not believe it possible to intercept AK before it passed through Selleri Strait.

— page 52 —
0420 Submerged.
: 1200 Position 5045's 1209071E.
: 1816 Surfaced.

Dec 1

: 0230 Decided to make transit of Buton Passage to patrol off 'Mowani Strait.
: 0511 Submerged. Commenced transit of Buton Passage.
: 1200 Position 5050's 1209571E.
: 1834 Surfaced in Buton Passage - commenced running at high speed to complete transit early.
: 1920 Lat 5°50'S Long 123°11'E. Sighted smell crest of undetermined type bearing 3200'True distant 4000 yards maneuvered to avoid.
: 1930 Lost contact.
: 1943 Resumed normal course through passage.
: 2100 Completed transit of Buton Passage.

Dec 2

: 0489 Submerged off Mowani Strait.
: 1200 Position 4916'S 123°15'E.
: 1834 Surfaced.

Dec 3

: 0428 Submerged off Mowani Strait.
: 1200 Position 4919'S 123°15'E.
: 1834 Surfaced.

Dec 4

: 0443 Submerged off Mowani Island.
: 1200 Position 3248'S 123°19'E.
: 1908 Surfaced - headed for Amban - Tamba Island track.

— page 54 —
0540    Surfaced, Patrolling passage.
: 1200    Position 3004'N 12609'E.
    Plane Contact #5.
: 1218    Lat 3006'N Long 12610'E. Contact
    on radar at 8 miles - submerged.

Dec 11

: 0431    Submerged off Siao Passage for trim
    and temperature gradient.
: 0308    Surfaced to patrol.
    Plane Contact #6.
: 0942    Lat 3014'N Long 12617'E. Contact
    on radar at eight miles - submerged.
: 1200    Surfaced to patrol. Position
    Lat 3019'N Long 12619'E.

Dec 12

: 0210    Ship Contact #7.
    Lat 3044'N Long 12614'E. Sighted
    smoke of large convoy bearing 3000m -
    Commenced tracking convoy.
: 0619    Submerged - convoy track determined
    to be 1030m - speed 9.2 knots. Convoy
    was zigging radically. Each ship
    could have been steering constant
    helm course.
: 0747    Lat 3007'N Long 12606'E. Fired 5
    torpedoes at large Kosci class
    freighter.
: 0749    Heard first torpedo explosion followed
    immediately by a second low order
    explosion.
: 0752    Presence of ships in second column
    with 50 Port angle on their bows and
    range about 1500 yards caused decision
    to go to 100 feet. With escort
    closing, forced to deep submergence
    and silent running.
: 0753    Seven death chevages, one of which
    was fairly close.
: 0842    Returned to periscope depth. Noticed
    smoke of convoy bearing 1210 true and
    masts of two escorts near one heavily

- 11 -

— page 55 —
1140
: 1200
: 1245
: 1721
: 1800
: 1910
: 1925
: 2000
: 2100
: 2345
: 1200
: 1245
: 1800
: 1910
: 1925
: 2000
: 2100
: 2345
: 1200
: 124

— page 56 —
15
Dec 15
Petrolling on surface enroute to
1200 N 150°E
Position 6505N 128000'E.

Dec 16
0001 Z
In position 10045N 13045'E released
to control of CTF 17.

Dec 17
Enroute Midway.
1200 I
Position 18216'N 134010'E.

Dec 18
Proceeding Midway.
1200 I
Position 165145N 127012'E.

Dec 19
Proceeding Midway.
1200 I
Position 185215N 14056510'E.

Dec 20
Proceeding Midway.
1200 K
Position 1838210'N 14433640'E.

Dec 21
Proceeding Midway.
1200 K
Position 194615N 146000'E.

Dec 22
Proceeding Midway.
1200 K
Position 200521N 151042'E.

Dec 23
Proceeding Midway.
1200 L
Position 21411N 165000'E.

Dec 24
Proceeding Midway.
1200 L
Position 200501N 161000'E.

Dec 25
First Christmas Day.
Proceeding Midway.
1200 L
Position 24005'N 165045'E.

- 13 -

— page 57 —
2300 L Changed time and date to +12 Zone Description in order to experience two consecutive Christmas Days.

Dec 25
Second Christmas Day.
Proceeding Midway.
1200 Y Position 25°00'N 170°00'W.

Dec 26
Proceeding Midway.
1200 Y Position 25°53'N 173°43'W.

Dec 27
Proceeding Midway.
1200 Y Position 27°10'N 178°53'W.

Dec 28
0928 Y Moored alongside USS DACE at north pier Midway.
1501 Y Underway from Midway proceeding to Pearl Harbor after receiving 87,000 gallons diesel fuel oil.

Dec 29
Proceeding to Pearl Harbor, T.H.
1200 Y Position 24°21'N 174°05'W.

Dec 30
Proceeding to Pearl Harbor, T.H.
1200 X Position 29°25'N 168°24'W.

Dec 31
Proceeding to Pearl Harbor, T.H.
1200 W Position 21°11'N 160°37'W.

1 Jan 1944

1100 W-V Arrived at Pearl Harbor.
End of Patrol.

— page 61 —
1. U.S.S. TUNA - REPORT OF NINTH WAR PATROL.
2. (H) ATTACT DATA.
3. U.S.S. TUNA TORPEDO ATTACT NO. 1 PATROL NO. 9.
4. Time 0255 Date 21 Nov. Lat 6°15'S Longl13°14'E.
5. Target Data - Damage Inflicted
6. Description: This contact was sighted in a heavy rain storm during a flash of sheet lightning. The ship was not seen again until after it had been hit and at that time it was seen for just an instant in another flash of lightning. It appeared to be a medium sized AK with well deck and composite superstructure. Visibility was so poor that details of the action were not clear. From analysis afterwards it seemed possible that there were two ships of similar size instead of one and possibly an escort.
7. Shio Sunk - [Sunk]
8. Ship Damaged - Probably sunk.
9. Or Probably sunk.
10. Damage Deter - Sighting immediately after ship mined by was hit and the circumstances surrounding the attempts to regain contact.
11. Target draft 16 Course 170°T Speed 8 Kts.
12. Range 1100 yds (at firing)
13. Own Ship Data
14. Speed 14 Course 266°T Depth Surface Angle - (at firing)
15. Fire Control and Torpedo Date
16. Type Attack. Target was sighted in lightning flash during heavy rain when visibility was about 300 yards. Coached reader on target and tracked for about one hour. Then made surface approach and fired 4 torpedoes using 2° diver-gent spread by reader bearing at 1100 yards.

— page 62 —
19 - CONFIDENTIAL

U.S.S. TUNA - REPORT OF NINTH WAR PATROL.

Even at this range target was not visible. 62 seconds after firing first torpedo heard and felt one torpedo explode. Immediately after the explosion during our turn away target was sighted again during another flash of lightning. Surrounded by smoke the target appeared to be burning. During the turn away an indication of another ship on approximately the same bearing but about 1500 yards further away was seen on the radar screen. It was lost during the turn. On one of our own range was about 2000 yards from head back towards target. It this time a target was found on the screen that the "Ommending Officer thought was the original target, but TDC operator at 8.5 Kts. on course target. It was tracked contacts at short range forked the ship to maneuver to avoid. One small ship was known to be in the area because it made high speed and showed a light at time. It now seemed probable that the ship that was hit soon sank, that the small contacts in the area were debris from the sunken ship and that the second ship ascended to the southeast while we were maneuvering to avoid what we thought to be an escort.

Ry 0420 after contact had been lost it was thought necessary to open to the northward to seek deeper water before daylight.

— page 63 —
1. Tubes Fired
2. Track Angle
3. Gyro Angle
4. Depth Set
5. Power
6. W/T or Miss
7. Erectile
8. Mark "Tornado"
9. Serial No.
10. Mark "Xxoldder"
11. Serial No.
12. Actuation Set
13. Actuation Actual
14. Mark "Marhed"
15. Serial No.
16. Explosive
17. Firing Interval
18. Type Sreed-Divergent
19. Sea Conditions
20. Overheul Activity
21. U.S.S. TUNNA TORPEDO ATTACK NO. 2 PATROL NO. 6.
22. Time 0747 Date 12 Dec Lat 20°44'N Long 12601'4'E.

Target Data - Damage Inflicted

Description: Convoy consisted of approximately 5 large ships (AKs or APs) and 3 smaller ships two of which were similar to AMs and one d.E. They were roughly in three columns zigging radically and using short legged zigs. Course was estimated by tracking to be 1020' and speed to be 912 kts.

Ship Sunk -
Ship Damaged or - Probably sunk. (One Koeci Probably sunk type freighter).

Damage Deter- This ship was stopped at the mined by firing solnt and remained there all day. Two escorts circled the ship until approximately 1930 at which time the escorts left the area at high speed. All other ships in the convoy continued on their base course and were soon lost to sight.

Target draft 12 "Course 1450" speed 0.2 kts. Range 2300 yds. (at firing)

— page 64 —
21 - CONFIDENTIAL
U.S.S. TUNA - REPORT OF NINTH WAR PATROL.
Own Ship Date
Speed & Course 212 North 55° Angle 30° (at firing)
Fire Control and Torpedo Data

Type Attack. Smoke from target was sighted at 0210 and tracking started. Submerged and started attack at 0619. The target attacked seemed to stand out from the start. It seemed a little closer and a little larger than the others. It had a position on its own right flank. As the attack developed two large ships in the second column continued to present a 50 angle on the bow right up to the time the last torpedo was fired at this time the estimated range to the leading ship was 1500 yards. It is believed they passed close overhead as we went to 100 feet. No other ships gave promise of an opportunity to fire. Five torpedoes were fired at the target at average range of 2200 yards. At 1000 the following was fired on torpedo explosion was heard followed soon thereafter by a low order explosion. At 0945 on returning to periscope depth the target was observed to be still in the same position that we once observed when she was hit. Two scouts were in the near vicinity. Maintained visual contact during the day and up until 1925. One plane was sighted in the area during the afternoon. At 2000 reversed course to return to the vicinity of the vessels. At 2100 had passed through the area without making contact. At about 1930 believe AK sank after which escorts departed area at high speed. Visibility was very good. At 0245 abandoned search and proceeded to clear area. That only one hit was obtained may be accounted for by the fact that the commanding officer neglected to put into the TDC any check bearings. All during the firing he was observing the other ships in the convoy in an effort to determine how to bring the stern tubes to bear.

— page 65 —
1 2 3 4 5
: Track Angle 94P 95P 93P 98P 94P
: Gyro Angle 17 18 19 13-40 18
: Depth Set 10' 14' 10' 14' 10'
: Power H.P. H.P. H.P. H.P. H.P.
: Unit Miss Ht Miss Miss Miss
: Tactical Unknown Unknown Unknown Unknown Unknown
: Mark Torpedo 14-3-A 14-3-A 14-3-A 14-3-A 14-3-A
: Serial No. 23675 24318 23539 24138 25159
: Mark Exclod- or 6-4 6-4 6-4 6-4 6-4
: Serial No. 5746 9408 10699 6324 6695
: Activation Set C & M C & M C & M C & M C & M
: Activation Actual 16 16 16 16 16 16
: Mark Warhead 3618 5550 9703 1629 5855
: Serial No. 3618 5550 9703 1629 5855
: Explosive TPX TPX TPX TPX TPX
: Firing Interval 9 6 14* 15* 3
: Type Spread Hit 1-1NxW 1-NxW 1-NxW 1-NxW 1-NxW
: Sea Conditions 1-NxW PELIAS PELIAS PELIAS PELIAS PELIAS
: Overhaul Activity PELIAS PELIAS PELIAS PELIAS PELIAS

* believe these times were incorrectly observed.
* believe the actual firing intervals were very near 8 seconds.

— page 66 —
1. MINE.
    : 2. REPEAT OF NINTH WAR PATROL.
    : 3. MINE.
    : 4. REPEAT OF NINTH WAR PATROL.
    : 5. MINE.
    : 6. REPEAT OF NINTH WAR PATROL.
    : 7. MINE.
    : 8. REPEAT OF NINTH WAR PATROL.
    : 9. MINE.
    : 10. REPEAT OF NINTH WAR PATROL.
    : 11. MINE.
    : 12. REPEAT OF NINTH WAR PATROL.
    : 13. MINE.
    : 14. REPEAT OF NINTH WAR PATROL.
    : 15. MINE.
    : 16. REPEAT OF NINTH WAR PATROL.
    : 17. MINE.
    : 18. REPEAT OF NINTH WAR PATROL.
    : 19. MINE.
    : 20. REPEAT OF NINTH WAR PATROL.
    : 21. MINE.
    : 22. REPEAT OF NINTH WAR PATROL.
    : 23. MINE.
    : 24. REPEAT OF NINTH WAR PATROL.
    : 25. MINE.
    : 26. REPEAT OF NINTH WAR PATROL.
    : 27. MINE.
    : 28. REPEAT OF NINTH WAR PATROL.
    : 29. MINE.
    : 30. REPEAT OF NINTH WAR PATROL.
    : 31. MINE.
    : 32. REPEAT OF NINTH WAR PATROL.
    : 33. MINE.
    : 34. REPEAT OF NINTH WAR PATROL.
    : 35. MINE.
    : 36. REPEAT OF NINTH WAR PATROL.
    : 37. MINE.
    : 38. REPEAT OF NINTH WAR PATROL.
    : 39. MINE.
    : 40. REPEAT OF NINTH WAR PATROL.
    : 41. MINE.
    : 42. REPEAT OF NINTH WAR PATROL.
    : 43. MINE.
    : 44. REPEAT OF NINTH WAR PATROL.
    : 45. MINE.
    : 46. REPEAT OF NINTH WAR PATROL.
    : 47. MINE.
    : 48. REPEAT OF NINTH WAR PATROL.
    : 49. MINE.
    : 50. REPEAT OF NINTH WAR PATROL.
    : 51. MINE.
    : 52. REPEAT OF NINTH WAR PATROL.
    : 53. MINE.
    : 54. REPEAT OF NINTH WAR PATROL.
    : 55. MINE.
    : 56. REPEAT OF NINTH WAR PATROL.
    : 57. MINE.
    : 58. REPEAT OF NINTH WAR PATROL.
    : 59. MINE.
    : 60. REPEAT OF NINTH WAR PATROL.
    : 61. MINE.
    : 62. REPEAT OF NINTH WAR PATROL.
    : 63. MINE.
    : 64. REPEAT OF NINTH WAR PATROL.
    : 65. MINE.
    : 66. REPEAT OF NINTH WAR PATROL.
    : 67. MINE.
    : 68. REPEAT OF NINTH WAR PATROL.
    : 69. MINE.
    : 70. REPEAT OF NINTH WAR PATROL.
    : 71. MINE.
    : 72. REPEAT OF NINTH WAR PATROL.
    : 73. MINE.
    : 74. REPEAT OF NINTH WAR PATROL.
    : 75. MINE.
    : 76. REPEAT OF NINTH WAR PATROL.
    : 77. MINE.
    : 78. REPEAT OF NINTH WAR PATROL.
    : 79. MINE.
    : 80. REPEAT OF NINTH WAR PATROL.
    : 81. MINE.
    : 82. REPEAT OF NINTH WAR PATROL.
    : 83. MINE.

— page 67 —
U.S.S. TUNA - REPORT OF NINTH WAP PATROL.

(L) RADIO.
Radio reception on VIXO was good at night and poor during the day, with occasional enemy interference. Reception on Haiku broadcast was poor day and night with a slight increase in the evening. All numbered series were received complete.

(M) RADAR.
The SJ and SD radars performed satisfactory during entire patrol. Ranges on SJ of verious types of targets were as follows: fishing boats 1500-2500 yards; medium sized freighter 9000 yards; unidentified ship 15,500 yards. Airborne contacts on SD varied between 35 to 8 miles.

With the exception of several small boat contacts at short ranges, the SJ did not make a single contact not previously sighted. With greater power it would be of more value.

(N) RADIO AND SOUND.
Sound conditions in areas were generally good with a high noise level usually present. The SD caused as much interference that the broadcast receivers could not be used at the same time.

(O) DENSITY LAYERS.
Each morning on station a deep dive was made in order to observe density layers on both hydro-moroph. In area bounded by 20s and 83s and 1173E and 1253E a negative gradient of 4 to 8 was usually found starting at about 100 foot depth.

(P) HEALTH FOOD AND HABITABILITY.
Health and habitability were good throughout the patrol.

List of Sick and Diseases with deye work FINLAN, H.J., MMMMO. Wound - Crushed great left toe 18-20 Dec. 7 MAXWELL, "O., TMC. Gonococcus Infection of Urethra 12 Nov to date.

Loss of 2 FINLAN, H.J., MMMMO. Wound - Crushed great left toe 18-20 Dec. 7 MAXWELL, "O., TMC. Gonococcus Infection of Urethra 12 Nov to date.

- 24 -

— page 68 —
U.S.S. TUNA - REPORT OF NINTH WAR PATROL.

List of Sick
ROBINSON, W.F., TM2c
ROSS, D.A., 502c
*STACEY, F.J. OM2c
STORMS, J.R. PhM1c
WISE, W.G., MoMM1c

Loss of
Diagnosis
Dislocation - Left
shoulder, 7-27 Nov.
Conocoocous Tn-
fection of Urethra
17 Nov to date
Amputation Traumatic, 1
distal, 6th
finger left hand, 31 Dec.
Otitis Media - 9
External 8-17 Dec.
Conocoocous Tnfection
of Urethra 13 Nov to
13 Dec.
*While attempting to
searchlight this man
looking on hole sheering off its end.

(PERSONNEL.
Number of
Persons
having this
Personnel
having

— page 69 —
U.S.S. TUNA - REPORT OF NINTH WAR PATROL.

(R) MILTS STEAMED - FUEL USED.
Base to area....1907.5 Miles...1840 Cols.
In area......5874.7 Miles...4925 Cols.
Area to base....4524.7 Miles...4120 Cols.
(Pearl Harbor)

(S) DURATION.
Days enroute to area....7
Days in area......32
Days enroute to base....18 (Pearl Harbor)
Days submerged......18 (hr. or longer)

(T) FACTORS OF ENDURANCE REMAINING.
Torpedoes Fuel Provisions
15 1300 Gals. 5 days
(Midway)

(U) REMARKS.
(a) No min-eveeing activities noticed.
(b) No comment on d-gesuising of enemy ships.
(c) No comment on enemy readers.
(d) As indicated on Annex Fox to CTF 71.1 operation plan No. 1-43 the vicinity of the Sangi Islands appears to be an important focal point for enemy traffic.

— page 70 —
35-62/A16-3
F35-62/A16-3
Fleet Post Office,
San Francisco, Calif.,
CONFIDENTIAL

FIRSTINDORSEMENT to
USS TUNA - Report of
Ninth War Patrol.

From: The Commander Submarine Division SIXTY-TWO.
To: The Commander in Chief, U.S. Fleet.
Via: The Commander Task Force SEVENTEEN.

Subject: USS TUNA, Ninth War Patrol - Report of.

1. Forwarded.

2. The TUNA'S ninth war patrol covered a period of 55 days from Fremantle Australia to Pearl Harbor. Thirty-three days were spent patrolling the Netherlands East Indies, North of the Malay Perrier, in Commander Task Force Seventy-One areas, and seventeen days in areas of Commander Task Force Seventeen enroute Pearl Harbor.

3. Four contacts were made with ships of a size suitable for attack with torpedoes.

Two of these were developed into attacks. The first one on 21 November with four torpedoes resulting in one hit. This target may have sunk, but the evidence is inconclusive. It was lost from the radar screen while dodging patrol craft and fishing boats. In the attack on the convoy on 10 December five torpedoes were fired at an 8000 ton freighter with one or possibly two hits. There is every reason to believe that this attack finally sank at the firing point later that same night. It was last seen at 1905 low in the water smoking heavily and being circled by two patrol craft. A thorough search of the area from 2000 to 2345 failed to disclose any sign of the ship or escorts although the visibility was excellent.

4. The assigned area were well covered and the special mission was executed with disetach. However, it is not believed that full rendezvous were taken of all the opportunities for attack which were encountered. In the attempted attack on the two ship convoy on 27 November evading on the surface rather than diving when the escort turned the searchlight on would probably have allowed a position to be

— page 73 —
1-12/16-3(8)/(16) SUBMARINE FORCE, PACIFIC FLEET
Serial 086
CONFIDENTIAL
SPECIND ENDORSEMENT to
TUNA Report of Ninth
War Patrol.
COMBUSEFAC PLTROL REPORT NO. 341
U.S.S. TUNA - NINTH 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. TUNA (SS203) - Report of Ninth War Patrol.
(7 November 1943 to 1 January 1944)

1. Ninth War Patrol by the U.S.S. TUNA was the first for the new
   Commanding Officer as such. The patrol was spent in areas under the operational
   control of Task Force Seventy-One, and enroute Pearl Harbor, T.H. Commander Submarine Division Sixty-Two was embarked in the TUNA.

2. Of the four contacts worthy of torpedo attack, the TUNA made
   attacks on two of them. Anti-submarine measures and the weather prohibited the
   TUNA from observing results.

3. This patrol is considered successful for Combat Insignia award.

4. The Commander Submarine Force, Pacific Fleet, congratulates the
   Commanding Officer, officers, and crew for this successful war patrol. The TUNA
   is credited with having inflicted the following damage upon the enemy:

DAMAGED
1 - Freighter (class unknown) - 4,000 tons
1 - Freighter (KOSET MARU class) - 8,222 tons

TOTAL - 12,223 tons

NOTE: Inasmuch as the above damage was inflicted under the control of the
Commander Task Force Seventy-One, it is requested that it be
credited accordingly.

C. L. LOCKWOOD, Jr.

DISTRIBUTION:
(Complete Reports)
Cominch (5) Comcorpac (1)
CNO (5) Consubspace (40)
Cinepac (6) SUBAD, MI (2)
Intel. Con. Fac. Ocean (3) ConsubspaceSubcordcom (3)
Areas (1) 1/1 Squadron and Div. (2)
Corservpac (1) Commanders,Subspace (2)
(Adv.Base Flen.Unit) (1) Consubstrcinpac (2)
Cinclant (2) 1/1 Submarines,Subspace (1)
Consubsclent (8)
S/M School, NL (2)
Comscope (2)
Comsubcoswspace (1)
Comsubcoswspace (2)
CTF 72 (2) J. L. WOODRUFF, Jr., Flag Secretary.

— page 75 —
1. CONFIDENTIAL
U.S.S. TUNA - Report of Tenth War Patrol.

A. PROLOGUE
Returned from Ninth War Patrol on 1 January 1944 and proceeded directly to U.S. Naval Dry Docks, Hunter's Point, San Francisco, California, for Navy Yard overhaul - the first for this vessel since her commissioning in January 1941.
Completed Navy Yard overhaul on 24 March 1944.
After four days loading period departed Hunter's Point, San Francisco, California, on 29 March 1944.
Arrived Pearl Harbor, Oahu, T.H., on 6 April 1944, and allowed four days voyage repairs and ten days training plus two days loading.

B. NARRATIVE
(All times are zone times as indicated)

24 April 1944
1330 V-W Underway proceeding towards patrol area via Midway.

25 - 28 April 1944
Enroute Midway conducting general drills, fire control drills, etc. Arrived Midway - fueled.

29 April 1944
1530 M Departed Midway enroute patrol area.

30 April 1944
0400 M Crossed 120th meridian; changed date to 1 May 1944

1200 M Position Lat. 26°37'N Long.178°08'30"E.

2 May 1944
Enroute Patrol area conducting daily dives and drills

1200 M Position Lat. 25°04'N, Long. 172°06'E.

— page 76 —
3 Key 1944
Enroute patrol area conducting daily dives and drills.
0800 K Position Lat. 24°23'N, Long.163°54'E.
2000 L Position Lat. 23°35'N, Long.167°58'E.

4 Key 1944
Enroute patrol area.
0805 L Sighted HADDOK and joined her.
0811 (Ship Contact # 1). Sighted small two masted
trawler on SSE course, speed about 9 knots.
Ran away on surface until range was about
22,000 yards, dived, and commenced approach.
Made battle surface with target broad on
starboard bow, range about 1800-2000 yards.
Opened fire with both 20MN guns, and when
fire was returned, commenced firing with 5"
gun. Target down by stern after last 5" hit.
Sank about 10 minutes later. Picked up three
prisoners, one of whom died -board from the
effects of 20MN wounds and shock. Transferred
2 prisoners to HADDOK.
After the target had sunk, the deck force
was engaged in retrieving floating crates.
In this operation, the Chief of the Boat,
HUFF, John Kirkman, 336 90 17, CTN(AA), USN,
lost his footing and was swept over the side
in a calm sea. He was observed to sink and
drown after about four minutes in the water.
0800 Position Lat.220°6'N, Long.163°47'E.
2000 Position Lat.220°0'N, Long.135°27'E.

5 Key 1944
Enroute patrol area; conducting daily dives
and drills.
0800 L Position Lat.270°21'N, Long.162°47'E.
2000 Position Lat.210°47'N, Long.160°34'E.

6 Key 1944
Enroute patrol area; conducting daily dives
and drills.
2200 K to Unable to send despatch to NPW.
0200 K
0800 L Position Lat.210°02'N, Long.157°56'E.
2000 K Position Lat.20°41'30"N, Long.155°42'E.

— page 77 —
7 May 1944
Enroute to patrol area; conducting daily dives and drills.
0800 K
Position Lat.19055'N, Long.152057'E.
2000
Position Lat.19038'N, Long.150050'E.

8 May 1944
Enroute to patrol area; made daily dive.
At midnight crossed through Mariana chain of islands.
0800 K
Position Lat.19059'N, Long.14801530"E.
2000
Position Lat.15020'N, Long.146047'E.

9 May 1944
0400 K
Tried again to send despatch to NPM with no results. Could not raise NPM. Made daily training dive enroute to patrol area.
2000
Sent TUNA One despatch to Consumpac.
Converted #5A & B Fuel Ballast Tanks to Main Ballast Tanks. Time 15 hours.
0800
Position Lat.17013'N, Long.143053'E.
2000
Position Lat.16035'N, Long.142904'E.

10 May 1944
0800 K
Position Lat.15020'N, Long.139042'E.
Changed time to zone (-)9, (I).
Made daily trim dive enroute to area.

11 May 1944
Decided to patrol Guam - Palau line just outside assigned area.
0755 I
(Plane Contact # 1). Submerged on course 1950T.
1726
Surfaced. Patrolled along 0650 - 2450 line during darkness.
0800
Position (DR) Lat.10034'N, Long.137054'E.
2000
Position (DR) Lat.10006'N, Long.137024'E.

12 May 1944
0530 I
c/c to 1800.
0800
Surfaced for sun line.
0835
c/c to 1000, heading for Yap Island.
0946
Sighted Yap Island bearing 0960T.
0957
Submerged on course 1000T.

- 3 -

— page 78 —
1436 c/o to 0000T.
1514 (Ship Contact # 2). Smoke on horizon bearing 1630T. Bearing drew to the west, so came around to course 2150T, and plotted bearings. At 1800 (sunset) surfaced, and commenced chase with smoke barely in sight. At 1940 SJ picked up target bearing 2800T, range 17,600 yards. Pip was small and faded in and out. At range of 5900 yards, a mast could just be discerned. Tracked on course 2850T, speed 12 knots. Made end around and at 2312 dived. Target was pinging on 18 kcs at 8 second intervals. At range of 3700 yards, target could not be clearly made out through periscope in bright moonlight. Decided target was too small for attack. Turned away, and surfaced at 0013. Set course 0800T to get out of BALAO's area. Position Lat.9051'N, Long.13705'1'E. Position Lat.9051'N, Long.13701'1'E.

13 May 1944

0810 I (Flame Contact # 2). Radar and lookouts sighted Navis on course 2200T. Dived. Contact range 14 miles. Surfaced. Sighted Ulithi Islands bearing 1310T, distance 12 miles. Made reconnaissance of Ulithi anchorage by high periscope while skirting northern and northeasterly coasts of the islands at distances of 35 to 5 miles. No shipping of any kind seen. Three peculiar structures were observed on Delaas Island, which may have been lookout towers. These were slim, pyramidal shaped, and are not believed to be trees. Extend much above tree tops viewed from NW, but couldn't be seen from NE. c/o to 0450 to clear island area. c/o to 1300 to approach Fais Island. Position Lat.10031'N, Long.136009'E. Position Lat.10017'N, Long.140003'E.

14 May 1944

0440 I Fais Island on SJ bearing 1550T, distance 11.8 miles. c/o to 1900T.

— page 79 —
0450
U.S.S. TUNA - Report of Tenth War Patrol.

0450
Submerged at dawn. BT card showed isothermal (820) to 225°. Closed island, and circled during day, taking pictures from western side. At dark, surfaced (1830 I) and fired 24 rounds of 5" H.C. at "Refinery Point" phosphate works from range of 8500 yards bearing 207°N. Results not observed. Cleared island to NE, and at 2100 stood southeast to Sorol Islands. Position Lat. 9°48'N, Long. 140°29'E. Position Lat. 10°00'N, Long. 140°49'E.

15 May 1944

0717 I
(Plane Contact # 3). Plane at 11 miles closing on "SPD". Submerged.
1100
Surfaced.
1254
Sighted Sorol Islands bearing 2340T observed island from northeastward to southward. Two radio masts close by lookout or water tower, with small pier on southern coast southeast of tower. No activity observed.
1511
c/c to 1800.
1830
c/c 2700, 1930 slowed to auxiliary engine and c/c to 2330 enroute southeastern corner of new area.
0800
Position Lat. 8°32'N, Long. 140°59'E.
2000
Position Lat. 7°18'N, Long. 140°06'E.

16 May 1944

1110 I
Submerged.
1426
Surfaced.
1930
Entered area "10P". c/c to 3150 heading for Palau distance 215 miles.
2210
Position Lat. 6°13'N, Long. 158°38'E.
0800
Position Lat. 5°11'N, Long. 137°22'E.

17 May 1944

0519 I
Submerged to wash #3 MFT.
0555
Surfaced.
0939
(Plane Contact # 4). Lookout sighted plane bearing 140° distance 24 miles, on course 295°T. SD radar picked it up 15 seconds later. Submerged.

— page 80 —
1400
Surfaced.
(Plane Contact # 5). OOD sighted bomber at 12 miles. Submerged.
1615
Surfaced.
1900
c/c to 0000T.
0800
Position Lat.5055'N, Long.136023'E.
2000
Position Lat.7007'N, Long.135015'E.

12 May 1944.

0000 I
c/c to 2200T, intending to patrol submerged on SW course to cover ships leaving Palau to South or Southeast.
0130
c/c to 2050T.
0248
Sighted the glow from lights on Palau bearing 2650T.
0310
Occasional radar interference apparently from Palau.
0503
Submerged for periscope patrol.
0727
c/c to 1800T.
1230
c/c to 2700T.
1830
Surfaced. Ran out to SE and at 1900 turned south.
2230
c/c to 0250T.
2000
Position Lat.843'N, Long.134051'E.

19 May 1944.

At 0500 c/c to 0550T. Radar interference showing occasionally, believed to be from friendly submarine, bearing about 0200T. At 0600 (Plane Contact # 6) "SD" picked up plane at 5 miles. Submerged and commenced periscope patrol.
0945 I
Surfaced.
1100
c/c to 1800.
1132
(Plane Contact # 7). "SD" picked up plane at 25 miles. OOD thought: range reported was 6 miles. Submerged.
1200
c/c to 0900T.
1328
(Plane Contact # 8). Sighted float plane in periscope, distance 6 - 8 miles, on course 0100T.
1828
Surfaced.
1900
c/c to 1800T.
2100
c/c to 2400T.

— page 81 —
2305
Radar contact. Tracked and determined course 080°, speed 13. Unable to sight target at 3000 yards. Believed friendly submarine (BALAO) returning to her area. Interference was observed on "SJ", similar to that from another "SJ".

: 2350
Ceased tracking, resumed course 240°. Position Lat.7041'N, Long.135521'E.
Position Lat.7036'N, Long.135045'E.

: 2000
20 May 1944

: 0513 I
1455
1500
1832
2230
0800
2000
21 May 1944

: 0800 I
1726
1900
0800
2000
22 May 1944

: 0300
0615
1732
0800
2000
23 May 1944

: 0545
0810
0545
0810

: 0800
Position Lat.5055'N, Long.133052'E.
Position Lat.5056'N, Long.133009'E.

: 0800
Position Lat.5055'N, Long.133052'E.

— page 82 —
1. USS TUNA - Report of Tenth War Patrol.

close together on the high midships superstructure, which could almost have been a conning tower. On succeeding observations, only one mast could be seen. From dead ahead she appeared to be a motor launch or motor torpedo boat, painted dark gray, whereas she appeared to be covered with grass viewed from the beam. Her course was varying, originally about 0300, changing to 0150, speed about 8 knots. No pinging was heard. Disappeared at 0920.

1833
2000
Position Lat. 50°28'N, Long. 135°04'E.

24 May 1944.

0630
1130
1500
1815
2000
0630
1130
1500

— page 83 —
1813 c/o to 1800T to clear island during darkness.
2000 c/o to 0900T.
2400 c/o to 3200T.
0800 Position Lat.5°20'N, Long.131°39'E.
2000 Position Lat.4°45'N, Long.132°06'E.

26 May 1944

0513 Dived with Sonsorol Islands in sight distance 8 miles dead ahead. Commenced reconnaissance of island. Found lookout tower on Sonsorol on western side of island, with a small pier or gangway or gangway extending from the beach to the reef where a dolphin could be seen. On northwestern side of island several rocks show 'above water' at about the charted location of the reef. Several small sea boats were seen between the islands. No evidence of the ship or escorts was seen.

1622 c/o to 2450T to open out from island.
1851 Surfaced.
1930 c/o to 2700T.
2000 c/o 3150T.
2400 c/o 0900T. Clearing area along western area boundary line.
2000 Position Lat.5°10'30"N, Long.131°45'E.

27 May 1944

0700 c/o 0530T.
0820 Submerged.
0935 (Plane Contact # 12). Two Sally's on course 0900, 180 miles west of Palau, seen in periscope.

1733 Surfaced.
1825 c/o 0900T.
2228 (Plane Contact # 13). Radar contact at 1100 yards on starboard beam. Nothing could be seen on bridge in fairly good visibility. Turned away and speeded up.

2231 Another radar contact on port beam at 2500 yards. Turned away.

2235 Had about settled on an oil drum as the source of the radar contact when the "SJ" got a saturation pip at 9500 yards. Attempted to track and continually changed our estimate of the target from large ship to DD to Pt or MTB.

— page 84 —
2340
c/o to 3150T, with no contacts other than rain squalls.
Position Lat.7001'N, Long.1310131'E.
Position Lat.7031'N, Long.1310561'E.

: 0800
c/o 2430T.
c/o 2300T.
c/o 0830T.
c/o 2630T.
c/o 2650T.
Submerged. Got fix and decided to rectify our position on the surface.
Surface. Periscope sighted one or two ships bearing 0900T, 100 starboard angle on the bow at an estimated range of 10,000 yards. Excellent visibility; escort sighted our periscope and headed for us. Own position Lat.70131'N, Long.1310141'E. (Ship Contact # 5).
Submerged. Could see nothing in periscope until 0612 when the angle on the bow was 100 port.
5 depth charges.
16 depth charges over a period of four minutes.
Closer.
6 explosions. Nothing heard until three more distant depth charges were heard at 1145. No pinging was heard at any time.
The number of depth charges indicates that this was more than a mere random embarrassing pattern.
Surface.
c/o to 2700.
c/o to 1000.
Position Lat.70531'N, Long.1310021'E.

: 0608
Submerged. Could see nothing in periscope until 0612 when the angle on the bow was 100 port.
5 depth charges.
16 depth charges over a period of four minutes.
Closer.
6 explosions. Nothing heard until three more distant depth charges were heard at 1145. No pinging was heard at any time.
The number of depth charges indicates that this was more than a mere random embarrassing pattern.
Surface.
c/o to 2700.
c/o to 1000.
Position Lat.70531'N, Long.1310021'E.

: 0608
Submerged. Could see nothing in periscope until 0612 when the angle on the bow was 100 port.
5 depth charges.
16 depth charges over a period of four minutes.
Closer.
6 explosions. Nothing heard until three more distant depth charges were heard at 1145. No pinging was heard at any time.
The number of depth charges indicates that this was more than a mere random embarrassing pattern.
Surface.
c/o to 2700.
c/o to 1000.
Position Lat.70531'N, Long.1310021'E.

: 1700
Submerged.
c/o to 2700.
c/o to 1000.
Position Lat.70531'N, Long.1310021'E.

: 2045
c/o to 2700.
c/o to 1000.
Position Lat.70531'N, Long.1310021'E.

: 2000
c/o to 2700.
c/o to 1000.
Position Lat.70531'N, Long.

— page 85 —
29 May 1944
0100 c/c to 0400.
0200 c/c to 1000.
0522 Submerged.
1832 Surfaced.
2200 c/c 2700.
2253 c/c 00.
0800 Position Lat.7053'N, Long.131052'E.
2000 Position Lat.7037'N, Long.132028'E.

30 May 1944
0010 c/c 0900.
0520 Submerged.
1840 Surfaced on course 00.
Patrolled on westerly courses in moon's path until moonset.
0800 Position Lat.7038'N, Long.133010'E.
2000 Position Lat.7030'N, Long.133019'E.

31 May 1944
0110 c/c 0900T.
0416 c/c 1800T. Four engine speed.
0747 Submerged.
1830 Surfaced.
1900 c/c 2700.
1904 Submarine surfaced astern after firing 2 red flares bearing about 2400T, distance 3 miles. Believed to be BALAO.
2015 c/c 1350T.
2030 c/c 0450T.
2100 c/c 2250T. Intermittent and weak radar interference on A scope. This did not appear familiar to any of the radar operators. Bearing was roughly 3150T.
2322 Saw three quick flashes over horizon bearing about 2600T. These appeared to be brighter than gun fire, reddish orange in color, and all three distinct flashes occurred within a period of one second. Position of TUNA at the time Lat.5037'N, Long.133023'30"E.
0800 Position Lat.6021'N, Long.135014'E.
2000 Position Lat.5048'N, Long.135025'E.

- 11 -

— page 86 —
1 June 1944

Stood southeast until more radar interference was encountered on starboard bow. Believing the interference to be from an escort, we maneuvered to avoid until we resumed base course of 225° at 0226. Sighted a dim white light exhibited for about one minute bearing about 1950. It appeared to be on the horizon, but its relative change of bearing attern led us to believe it was nearer than the horizon. Radar could pick up nothing. Maintained course and speed. As it later turned out the interference during the night must have been caused by two friendly submarines in the immediate vicinity. It was possible to track roughly each submarine by its interference. It is believed no real enemy contacts were made that night.

0517
1704
1730

2000
2135
0800
2000

2 June 1944

0523 I
0601
1500
1444

1835
1900
2400
0800
2000

3 June 1944

0847
1700
2000
0800
2000

0847
1700
2000
0800
2000

Submerged.
Surfaced.
Position Lat. 35-12N, Long. 125-45E.
Position Lat. 35-12N, Long. 125-45E.

Submerged.
Surfaced.
c/o 100T.
Position Lat. 35-12N, Long. 125-45E.
Position Lat. 35-12N, Long. 125-45E.

Submerged.
Surfaced.
c/o to 100T.
Position Lat. 35-12N, Long. 131-36E.
Position Lat. 35-12N, Long. 131-36E.

- 12 -

— page 87 —
4 June 1944

0512 I Submerged.
1801 Surfaced. Patrolling on various courses.
2310 c/c 270, increased to 3 engine speed.
0800 Position Lat.8048'N, Long.132°47'E.
2000 Position Lat.8044'N, Long.133°12'E.

5 June 1944

0839 I (Plane Contact # 15). SD radar contact at 9 miles. Submerged.
1500 Surfaced.
2000 c/c to 2830T.
0800 Position Lat.8051'N, Long.131°30'E.
2000 Position Lat.8044'N, Long.129°41'E.

6 June 1944

0125 Commenced patrolling along east west axis in this vicinity.
0514 Got position .nd c/c 1800T.
0604 Submerged.
0753 (Ship Contact # 6). Sighted what developed to be three ships bearing 2500T. Commenced approach, but could not get into closer. position than 12,000 yards. Ships seemed to be milling about and not on any particular base course. Contact consisted of one large tanker with two escorts plus one other unidentified vessel. .ovements of the tanker were obscure because of the excessive range, but it is believed that he may have been attempting a rendezvous with another group of ships or other escorts. At 1001 secured from battle stations when target range was 21,000 yards, course 248°, angle on bow 160°. Sea was absolutely flat, and the visibility unlimited. One escort remained in the vicinity until about 1630. Set course 270°.
1008 1428 c/c 0500T.
1710 Surfaced. c/c 2830T.
1808 (Plane Contact # 16). Radar had plane contact at 3 miles. Submerged.
1838 Surfaced. Never able to determine which of three probable courses the ships took. It is believed they returned to Surigao Strait from where they came.

— page 88 —
2000 c/c to 0770T.
0800 Position Lat.9014'N, Long.128°28'E.
2000 Position Lat.9016'N, Long.127°52'E.

7 June 1944

0700 c/c 0900.
0831 Submerged.
1607 Surfaced.
2000 c/c 01130T.
0800 Position Lat.9058'N, Long.130°45'E.
2000 Position Lat.100°03'N, Long.132°05'E.

8 June 1944

0417 c/c 0900T.
0603 (Plane Contact # 17). 3D radar contact at 11 miles. Submerged. Commenced submerged patrol.
1828 Surfaced.
1902 c/c 1200.
0800 Position Lat.9023'N, Long.133°57'E.
2000 Position Lat.9021'N, Long.134°35'E.

9 June 1944

0521 Sighted smoke bearing 1500T. This is believed to be an escort ahead of convoy. (Ship Contact # 7). c/c 0200T.
0526 c/c 0000T.
0535 c/c 0550T.
0542 c/c 0800T.
0302 Submerged on course 1000T.
0645 (Plane Contact # 18). Sighted float plane bearing 1600 on easterly course evidently patrolling vicinity of convoy and escort.
1005 Last observation of smoke on bearing 1340T.
1925 Surfaced. c/c 0300.
2050 c/c 1200T.
2130 c/c 1300T during period of bright moonstreak.
2230 c/c 2000T.
2000 Position Lat.8031'N, Long.136°55'E.

10 June 1944

0633 Submerged.
1830 Surfaced.
1923 c/c 1800T.

— page 89 —
2036 c/c 2300T.
2240 Radar interference bearing 3200T.
c/c 1800T.
2300 Pip on SJ at 17,000 yards. (Plane Contact # 19). SD tracked him out very slowly to 26 miles. Night was very dark. Bearing 2420T. c/c 2300T.
2400 c/c 2700T.
0800 Position Lat. 6029'N, Long. 136021'E.
2000 Position Lat. 5055'N, Long. 135051'E.

11 June 1944

0623 I Submerged.
1833 Surfaced.
2320 c/c 2800T.
1200 Position Lat. 5031'N, Long. 134015'E.
2000 Position Lat. 5037'N, Long. 133048'E.

12 June 1944

0804 I c/c 3400T.
0630 Submerged.
0200 c/c 1100T.
1719 Surfaced.
2100 c/c 0640T and went to four engine speed enroute reported position of downed B-24.
0800 Position Lat. 5056'N, Long. 132000'E.
2000 Position Lat. 6032'N, Long. 133002'E.

13 June 1944

0200 c/c 0450.
0300 c/c 0350.
0328 Sighted dim flashing light bearing 2800T. (Ship Contact # 8). A ship and mast sighted on that bearing. Turned away on course 0900. This position is about 30 miles southwest of the reported position of the plane, and it is believed about 30 hours after the plane was downed. At this time believed current running northeast.
0533 c/c 00T.
0600 c/c 3050T.
0620 (Plane Contact # 20). Lookout sighted 2 engine bomber on starboard beam. Submerged.

— page 91 —
15 June 1944
U.S.S. TUNA - Report of Tenth War Patrol.

15 June 1944
0710 K (Flane Contact # 27). Lookout sighted Mavis on port bow at 10 miles. Submerged.
0836 Surface.
1413 (Plane Contact # 28). Lookout Sighted B-24 at 16 miles on southerly heading. Rader picked up and followed out to 22 miles.
0800 Position Lat. 5017'N, Long.141047'E.
2000 Position Lat. 5016'N, Long.144015'E.

13 June 1944
1143 K Sighted plane (Plane Contact # 29), range 12 miles.
2312 Sent TUNA 5 to NPN.
1200 Position Lat. 4954'N, Long.147039'E.

17 June 1944
1348 K c/c to 0730T.
2000 c/c to 0820T.
1200 Position Lat. 4033'N, Long.153025'E.

18 June 1944
0530 K Dived.
0600 Surface.
1011 Plane at 7 miles (Plane Contact # 30). Submerged. Rader did not pick him up.
1117 Surface.
2400 Set clocks ahead to "Lt" time.
1200 Position Lat. 5011'N, Long.157040'E.

19 June 1944
1200 L Position Lat. 6004'N, Long.162004'E.

20 June 1944
1200 L Position Lat. 6031'N, Long.136056'E.
1500 Sighted escort. Proceeded into Majuro mooring at 21 June.

- 17 -

— page 92 —
18 -

CONFIDENTIAL

U.S.S. TUNA - Report of Tenth War Patrol.

C. WEATHER:

The entire period in the area was exceptionally calm with glassy smooth surface, until 10 June when the wind and sea increased for four days. It was generally overcast in the evenings and cleared during the night about 50% of the time.

D. TIDAL INFORMATION:

Currents encountered as follows:
30 miles, 900 from Angaur I. 1.5 kts. 0740
50 miles, 900 from Babelthuap I. 2.0 kts. 2170
Southwest of Angaur I. 1.3 kts. 2190
50 miles, 2500 from Angaur I. 0.6 kts. 2170
120 miles, 2600 from Angaur I. 0.7 kts. 3330
90 miles, 1500 from Angaur I. 0.5 kts. 2400
Vicinity of Sonsorol I. 0.8 kts. 2500
Lat.10°50'N, Long.137°30'E. 0.4 kts. 2550

There could be a counterclockwise eddy east of southern part of Palau caused by the equatorial countercurrent.

E. NAVIGATIONAL AIDS:

1. Ulithi Islands cut in very well from the North and Northeast when using the middle points of the various islands.
2. Although no navigational lights were noted 20 miles off Palau, there were plenty of other lights seen on the beach.

— page 93 —
1. SHIP CONTACTS
No. | Time    | Date    | Lat/Long | Type    | Initial Range | Course & Speed | How Contacted | Remarks
---|---|---|---|---|---|---|---
1. | 0811 L  | 22°06'N | Sampan  | 12,000  | SSE 9 kts  | SD    | Sunk by gun fire.
    | 4 Iay   | 166047'E | 87 tons  |    |    |    |    |
2. | 1614 I  | 9037'N  | Tug    | 20,000  | 285 12 kts | P    | Sighted smoke, tracked
    | 12 May  | 137045'E |    |    |    |    | Identified as Escort or
    |    |    |    |    |    | tug at 3700 yards.
3. | 0810 I  | 650'N   | Motor    | 9,000   | NNE 8 kts  | P    | See narrative
    | 23 May  | 133038'E | Launch   |    |    |    |    |
4. | 1730 I  | 30°13'N | 2000 ton | 20,000  | ---    | SD    | See narrative
    | 25 May  | 131013'E | AK    |    |    |    |    |
5. | 0608    | 7013'N  | ---    | 20,000  | 270 10 kts | P    | See narrative
    | 28 May  | 131013'E |    |    |    |    |    |
6. | 0753    | 9012'N  | Tanker   | 20,000  | Various    | P    | Excessive Range
    | 6 June  | 128028'E |    |    |    |    |    |
7. | 0521    | 8033'N  | Escort  | 25,000  | 090 5 kts  | SD    | Excessive Range
    | 9 June  | 135057'E |    |    |    |    |    |
8. | 0328    | 6014'N  | Patrol  | ---    | ---    | SN    | See narrative
    | 13 June | 134039'E | Vessel |    |    |    |    |

— page 94 —
20 Miles --- SD Radar
Initial Course & Speed
How Contacted
Remarks
1. 0755 I 10°34'N 137044'E
--- 20 Miles --- SD Radar
Dived to avoid.
Not sighted.
2. 0610 I 10°06'30"N 138011'E
Patrol (Mavis Type)
15 Miles 2200T
SD Radar
Dived to avoid.
Not sighted.
3. 0717 I 8033'N 141001'E
--- 14 Miles --- SD Radar
Dived to avoid.
Not sighted.
4. 0634 I 6017'N 135052'E
Patrol
24 Miles 2950T(E)
Lookout
Dived to avoid.
Not sighted.
5. 1645 I 6047'N 135025'E
Bomber
12 Miles --- OOD
Dived to avoid.
Not sighted.
6. 0600 704130"N 135017'E
--- 5 Miles --- SD Radar
Dived to avoid.
Not sighted.
7. 1132 7048'N 135036'E
--- 26 Miles --- SD Radar
Dived to avoid.
Not sighted.
8. 1628 7046'N 135040'E
Float
6-8 Miles 0100P
P
Not sighted.
9. 1455 7002'N 134054'E
Betty
5 Miles 2800
P
Not sighted.
10. 0615 5056'N 132054'E
--- 9 Miles --- SD Radar
Dived to avoid.
Not sighted.

— page 95 —
1
G. AIRCRAFT CONTACTS (CONT'D)
Time    Date    Lat/Long    Type    Initial    Course &    How    Remark
    Range    Speed    Contacted    Range
11. 0951    5013'N     Betty    4 Miles    072°    SD    Dived to avoid.
    25 May    131039'E    Received 1 or 2
    depth charges.

12. 0935    7004'N    2 Sallys    6 Miles    0900    P    Not sighted
    27 May    151018'E

13. 2228    7051'N     ---    4 Miles     ---    SJ Radar    Believed not sighted
    27 May    132011'E    The night was very
    dark. Some radar
    interference was
    noted. Tracked out
    to 21 miles on SD.

14. 1444    6015'N     Betty    5 Miles    1000    P    Not sighted
    2 June    130037'E

15. 0639    8049'N     ---    9 Miles     ---    SD    Dived.
    5 June    131018'E    Not sighted

16. 1608    9015'N     ---    3 Miles     ---    SD    Dived.

17. 0003    9022'N     ---    11 Miles     ---    SD    Not sighted
    8 June    133053'E

18. 0645    8037'N     Float    5 Miles     ---    P    Not sighted
    9 June    136007'E

— page 96 —
1
G. AIRCRAFT CONTACTS (CONT'D)
Time    Date    Lat/Long    Type    Initial    Course &    How    Remarks
No.    Date    Lat/Long    Type    Range    Speed    Contacted    Notes
19.    2240    5037'N    8 Miles    East    SJ    Night contact.    Tracked out to 19 miles on 3D
20.    0620    5023'N    8 Miles    SD    Dived
21.    1046    6027'N    7 Miles    SD    Dived
22.    1502    6019'N    10 Miles    SD    Radar    Dived
23.    0600    5030'N    7 Miles    SD    Dived
24.    0651    5029'N    23 Miles    SD    Radar
25.    1502    5028'N    18 Miles    SD    Radar
26.    1322    5028'N    12 Miles    SD    Radar    Dived
27.    0710    5015'N    10 Miles    SD    Dived
28.    1413    5012'N    16 Miles    SD    Dived
    1st June 1430'4'E

Page 23

— page 97 —
1. Aircraft Contacts (CONT'D)
G. 29. 1143 K 4054'N 16 June 1470357'E
30. 1011 K 5010'N 18 June 157032'E

: 2. Initial Course & Speed
-- 12 miles ---
-- 7 miles ---

— page 98 —
20MM DETERRENT BY:
Observed disintegration and sinking.
DETAILS OF ACTION

TYPE GUN
AMMUNITION
5"/51
6 rounds HC
20MM
300 rounds tracer,ball,incendiary
.45 Thompson
250 rounds
.50 rounds

Target sighted by lookout. Ran ahead of target, dived, and made battle surface with target broad on starboard bow at 1800 yards. Opened fire with 20MM guns, and when target opened fire, commenced firing with 5", scoring 2 hits out of 5 shots. Third 5" shot hit, about the waterline astern, ensued clouds of smoke, which could possibly be attributed to depth charges on his stern.

First two 5" shots were fired well over the target, because the depression stop installed on the gun prevented laying the gun on the target with the ship heeling on a right turn.

Target was down by the stern after the first hit, and sank soon after the second hit.

20MM and 5" fire was effective.

I. MINES:
No remarks.

J. ANTI-SUBMARINE MEASURES AND EVASION TACTICS.
On 28 May escort turned toward and dropped charges without ever coming in close enough to hope for a contact. His minimum range is estimated at 4 miles.

Daily air patrols from Palau extend about 100 - 150 miles and are to be expected in both morning and afternoon. Air screens are used with passage of convoys. Plane contacts #1 to #4 may have been of some daily patrol from direction of Guam.

— page 99 —
1. Leaks in Kleinschmidt coils necessitated pulling, and silver soldering. Later found that measuring tank was made up handtight, and permitted sea water contaminated in of evaporator output. Necessitated dumping of all battery water on board.

2. Depression stop mechanism install on 5"/51 deck gun prevented laying gun on target at 1700 yard range when ship was heeling on a turn. It is believed that the stop could be modified to allow further depression with no sacrifice in safety.

3. Battery grounds in forward battery ventilation system required removal and washing of all vent ducts. Last cleaned in Navy Yard overhaul period ending February 1944.

4. Number 4 engine smokess excessively. It has for two patrols. Have been unable to locate case. Navy Yard overhaul did not improve the condition.

L. RADIO:

Receiving conditions were fair on all frequencies except for the period between 1800 to 2000 (GCT), when HAIKU schedules would fade to signal strength zero to one. During this period 9090 kilocycles was sometimes readable with a signal strength of about two. A split phone watch was stood on 450 kilocycles, but signals were heard only once, and then were unreadable. At Midway at the beginning of the patrol voice transmission and reception were employed satisfactorily. After leaving Midway there was no occasion to use the Voycall further. 155 numbered serials were received from Comsubpac; three were missed.

Considerable difficulty was experienced in attempting to transmit at night after 1300 (GCT). Later than this hour, 4235 kilocycles, and its three higher harmonics, were tried without success. Output strength at the transmitter was maximum, and the trouble is thought to lie in atmospheric conditions and the almost daily leaking of the antenna trunk through faulty gaskets. The third dispatch was cleared it was believed, with correct receipting and authentication, through VHM, at 0915 (GCT) 15 June 1944, but was apparently not relayed to ComTaskFor 17. The night of the fifth transmission, 16 June 1944,

— page 100 —
20.6.1944
U.S.S. TUNA - Report of Tenth War Patrol.

at 0620 (GCT) two different stations signing NPM, were heard amid considerable interference and jamming, so the dispatch was again cleared through VHM and was promptly relayed to the correct addressee. Five dispatches were transmitted.

Transmission at 0915 (GCT) 13 June 1944 was suspected of being receipted for by a Jap station that had most likely copied authentication from a recent transmission by some other U.S. station or ship. When transmitting on 13 June 1944 at 0620 (GCT) it was thought that some Jap station near Truk was using a M.C.W. signal swinging across NPM frequency, destroying signals being transmitted. This was also encountered on first transmission.

M. RADAR:
The performance of the radars this patrol was, on the whole, gratifying. The Sd-1 picked up land at 65,000 yards, a small target at 18,000 yards, and was able to track out a low, night-flying plane to 25,000 yards. The newly-installed P.P.I. gave invaluable service for continuous searching. As so few worthwhile contacts were made during the patrol it has yet to prove too difficult for the Sd-1 to locate. The Marisat, designed to transmit messages from the Sd-1, has proven highly satisfactory on the various seas in both directions of rotation. The T.B.I. from the same source, giving easily-read true and relative bearings simultaneously, was also greatly appreciated.

An 850 tube in the high voltage rectifier shorted out and was replaced. The A.F.C. switch came apart, giving erratic beat oscillators operation and was repaired. The 7.0 megohm, 10 watt resistor in the 705 A filament top circuit opened and was replaced. Excessive sweep shortening on the PPI scope was corrected by replacing a 6L6G tube and a 6HGCT/G tube. Low crystal current (below 0.5 amp) was brought up by installing a new crystal. A 721A tube was replaced after about 800 hours operation. The need of a high impedance voltmeter was felt many times.

The SD radar performed exceptionally well. Large planes were contacted at 20 miles and over, and were tracked out to 19 to 21 miles. The instrument keying method was used considerably both in the daytime and at night when a night search plane was suspected or verified by SJ. The one engagement was corrected by replacing a set of oscillator tubes in the transmitter.

Interference on SD screen was traced to two D.C. fans, one located in the control room and the other in the crews mess. The fan in the control room had a bad brush in it but the other was in good shape. When these were removed the interference was cut down 90%.

— page 101 —
1. USS Tuna - Report of Tenth War Patrol.
2. Results obtained by the ARP radar detector were rather disappointing. It was used at frequent intervals, but with possibly one exception succeeded, in picking up only the fifth lower harmonic of our own SJ. Although several times radar interference was indicated on the PPI scope, only twice where the presence of friendly submarines were virtually certain, were indications picked up.
3. SOUND GEAR AND SOUND CONDITIONS:
   - Pinging heard at 16,000 yards from escort or tug (Ship Contact # 2).
   - Sound conditions are excellent all over Palau area. Water is isothermal to cast of Palau probably because of strong currents.
   - To west of Palau negative gradients were experienced below 150 feet.
4. DENSITY LAYERS:
   - Density layers were scarce in the area. Seven out of fifty four cards showed a variation from an isothermal condition. With the exception of these seven instances, noted below, the area is remarkable for the uniformity of the water, to 220°. The temperature varied from 82° to 85° from day to day. It is believed that the high currents in the vicinity of Palau tend to maintain a homogeneous condition. The prevalent wind was very low, and the surface was almost uniformly mirror like.
   - The gradients noted were:
     - 24 May 5°N, 1250E 10 negative at 150 feet.
     - 25 May 5°N, 1250E 30 negative at 220 feet.
     - 26 May 5°N, 1515E 20 negative at 220 feet.
     - 4 June 5°N, 1250E 30 negative at 190 feet.
     - 5 June 5°N, 1250E 30 negative at 180 feet.
     - 10 June 5°N, 1350E 20 negative at 180 feet.
     - 14 June 6°N, 1385E 30 negative at 150 feet.
5. HEALTH FOOD HABITABILITY:
   - Health of crew was normal with the following exceptions.
     - **COXIALINT** PATIENTS SICK DAYS
     - Cellulitis 1 3
     - Burns, last Degree (Burnod 1 2
     - Abdomen and cheek handling
     - Hotshot case 1 3
     - Otitis Media, Left Ear 1 3
     - Drowning 1 2
     - - 27 - 28

— page 102 —
75
(a) Number of men on board during patrol
(b) Number of men qualified at start
(c) Number of men qualified at end
(d) Number of unqualified men on last patrol
(e) Number of men advanced during patrol

R. MILES STEAMED - FUEL USED:
Base to Area surface
In Area submerged
Area to Base surface
Surface

— page 103 —
1. The Commander Submarine Division One Hundred Forty-One.
To: The Commander-in-Chief, UNITED STATES FLEET.
Via: (1) The Commander Submarine Squadron FOURTEEN.
(2) The Commander Submarine Force, PACIFIC FLEET.
(3) The Commander-in-Chief, U.S. PACIFIC FLEET.

Subject: U.S.S. TUNA (S3203) - Report of Tenth War Patrol, Comments on.

1. The Tenth War Patrol of the U.S.S. TUNA was of fifty-eight days duration, of which thirty-four days were spent in the Palau area. The patrol was extended five days and terminated by provision of the operation order.

2. Excellent area coverage was maintained, although no torpedo attacks were made. Only two contacts were made that were worthy of torpedo fire. A grounded ship, protected by several escorts was sighted at dusk on day 25. As insufficient daylight remained, the TUNA retired and upon investigation the next morning, the ship and escorts had gone. The tanker and two escorts contacted on June 6 was not developed sufficiently to enable the TUNA to get into good attack position. One escort held the TUNA down, allowing the tanker to escape.

3. The gun attack on a trawler on day 4 was nicely handled. Three prisoners were picked up, one of whom died aboard from 20mm wounds. After the target was sunk, the Chief of the Boat, John Kirkman Huff, was lost overboard while engaged in retrieving floating crates.

4. It is believed that the Commanding Officer should have made a closer examination of the flashing lights on the nights of June 13 and June 14. This was in the approximate locality of the downed B-24 and every effort should have been made to determine the significance of these lights in spite of the patrol boats in the area.

5. The material condition of the TUNA seems excellent. All defects will be corrected by the BUCHANELL in the normal refit period.

6. The ship's crew appear to be well trained and their morale is high in spite of the disappointing results of this patrol.

G. E. PETERSON.

— page 104 —
FC5-14/A16-3
Serial 063.
CONFIDENTIAL

SECOND EVIDENCE TO
U.S.S. TUNA Report of
Tenth War Patrol.

From: The Commander Submarine Squadron Fourteen.
To: The Commander-in-Chief, U.S. Fleet.
Via: (1) The Commander Submarine Force, Pacific Fleet.
       (2) The Commander-in-Chief, U.S. Pacific Fleet.

Subject: U.S.S. TUNA (SS203) - Report of Tenth War Patrol, Comments on.

1. Forwarded, concurring in the remarks of the Commander Submarine Division One Hundred FORTY-ONE.

2. The lack of curiosity in the lights sighted on 13 June while searching for downed aviators under the assumption that it was an enemy patrol is not understood. It is considered that this contact should have been developed, even though the light was sighted only momentarily.

J. B. LONGSTAFF.

Copy to:
Comsubdiv 141.
CO TUNA.

— page 105 —
02639
F712-10/A16-3(15)/(16)
Serial 01350
CONFIDENTIAL
THIRD ENDORSEMENT to
TUNA Report of
Tenth War Patrol.
COMBUSPAC PATROL REPORT NO. 462
U.S.S. TUNA - TENTH 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. TUNA (SS203) - Report of Tenth War Patrol.
(24 April to 21 June 1944).
1. The tenth war patrol of the TUNA was spent in the vicinity of Palau.
2. No torpedo attacks were made. A successful gun attack was made against an armed trawler which resulted in the sinking of this vessel. The gun was also used to bombard the phosphate works on Pais Island.
3. This patrol is designated as "Successful" for Combat Insignia Award.
4. The Commander Submarine Force, Pacific Fleet, congratulates the Commanding Officer, officers, and crew for having inflicted the following damage upon the enemy:

SUNK
1 - Trawler - 100 tons (Gun Attack No. 1).

DISTRIBUTION:
(Complete Reports)
Cominch (7)
CNO (5)
Cinopac (6)
Intel.Cen.Pac.Ocean Areas (1)
Comservpac (1)
Ginclant (1)
Comsubslant (8)
S/W School, NL (2)
Comsopac (2)
Comsowespac (1)
All Squadron and Div.
Comsubswepspac (2)
Commanders, Subspace (2)
CTF 72 (2)
Comsubstrainpac (2)
Comtorpac (1)
All Submarines (1)
Comsubspac (40)
SUB-D, MI (2)
E. L. Hynes, 2nd, Flag Secretary.
ComsubspacSubord (3)

FILMED

— page 107 —
15 JULY 1944

1800 (L) Departed 1-jul-44 from Tenth War Patrol. Arrived 2-July 1944. Submarine Division 141. Transferred two officers and eleven men to the relief crew. Training consisted of one day's independent operation and three days supervised training. Readiness for sea. 15 July 1944.

15 July 1944

0000 (L) Enroute area in company with U.S.S. GATO, escorted by U.S.S. CAPTIVE. Escorted by U.S.S. CAPTIVE. 0630 Head trim dive. 0750 Subfaced. 0755 S.O. Aircraft Contact (#1) at 50 miles. 0800 Position Lat.5042°N, Long.170°02°E. 0913 S.O. Aircraft Contact (#2) at 12 miles. 0920 Released escort. 1100 S.O. Aircraft Contact (#3) at 11 miles. 1205 S.O. Aircraft Contact (#4) at 25 miles. 2000 Position Lat.1157°N, Long.170°23°E.

17 July 1944

Enroute area in company with U.S.S. GATO. Training dives and fire control drills during day. 0300 (L) Position Lat.1431°N, Long.170°20°E. 2000 Position Lat.1531°N, Long.158°05°E. 2025 Lost contact with U.S.S. GATO bearing 2280T, range 12,500 yards. 2030 One of the two S.O. radar mast hoisting cables broke. Began replacing with spare periscope cable.

18 July 1944

Enroute area. Training dives and fire control drills during day. 0800 (L) Position Lat.1805°N, Long.1370°E. 2000 Position Lat.1840°N, Long.155°32°E.

— page 108 —
19 July 1944
Enroute area. Training dives during day.
0800 (L) Position Let.20°24'1", Long.163°32'1".
1335 S.D. radar back in commission.
2000 Position Let.21°41'1", Long.161°46'1".

: 20 July 1944
Enroute area. Training dives and drills during day.
0800 (L) Position Let.23°32'1", Long.159°30'1".
1430 Set clocks to conform with (-10) zone time.
2000 Position Let.24°54'1", Long.157°40'1".

: 21 July 1944
Enroute area. Training during day.
0800 (K) Position Let.26°23'1", Long.155°08'1".
2000 Position Let.27°33'1", Long.153°00'1".
Indications of approaching storm.

: 22 July 1944
Enroute area. Training during day.
0800 (K) Position Let.28°44'1", Long.150°28'1".
2000 Position Let.29°05'1", Long.148°19'1".
Rarely sea all day.

: 23 July 1944
Enroute area. Training during day.
0800 (K) Position Let.29°18'1", Long.145°24'1".
2000 Position Let.29°25'1", Long.143°00'1".
Encountered heavy weather all day.

: 24 July 1944
Enroute area. Storm abating slowly.
0800 (K) Position Let.29°35'1", Long.140°35'1".
0842 Submerged.
0914 Sighted Sofu Gan Bearing 327°0T, distant about 15 miles.
1000 (K) Set clocks to conform with (-9) zone time. All times hereafter will be zone -9 (I) unless otherwise designated.
1605 (I) Surfaced.
2000 Position Let.29°32'1", Long.139°31'1".

: 25 July 1944
Enroute area on course 270°T.
0000 Ship Contact(#1) bearing 290°T, range 15,500 yards. Commenced tracking. Radar screen indicated four targets, all, except one, giving small pips.

- 2 -

— page 110 —
0705
Surfaced and called NTN on 12705 with no success. Sent message blind and was returning to area from quency when NTN asked for report.
0740
Reported message to NTN and then transitted contact on area frequency.
0800
Position Lat.29°18'N, Long.138°49'E.
0815
Proceeded towards assigned area.
2000
Position Lat.29°18'N, Long.137°49'E.

26 July 1944
0433
Submerged.
0200
Position Lat.29°23'N, Long.135°24'E.
1902
Surfaced.
2000
Position Lat.29°05'N, Long.134°33'E.
2100
Converted 5A2 fuel ballast. Submerged to wash out tanks.

27 July 1944
0441
Entered southeast corner of area.
0444
Submerged on 3200T.
0200
Position Lat.30°06'N, Long.132°55'E.
1940
Surfaced. Fartailing up and down moon path east of Tanego Shima.
2000
Position Lat.30°28'N, Long.132°41'E.
It was noted that at surfacing time CO2 content reached 3%. No restrictions had been placed on smoking.

28 July 1944
0452
Submerged.
0200
Position Lat.30°37'N, Long.131°49'E.
1946
Surfaced.
2000
Position Lat.30°35'N, Long.132°01'E.

29 July 1944
0457
Submerged.
0800
Position Lat.30°41'N, Long.131°35'E.
Heavy weather makes depth control difficult at periscope depth.
1947
Surfaced.
2000
Position Lat.31°08'N, Long.132°15'E.
2300
Received notice of approaching typhoon. Predicted track very close to us.

— page 111 —
30 July 1944

0515
0800
1940
2000

31 July 1944

0535
0300
1926

2000

1 August 1944

0442
0800
1952
2000
2302

2 August 1944

0404
0407
0800
1947
2000
2117
2122
2235

3 August 1944

0437
0800

3 August 1944

- 5 -

— page 112 —
1945
1945
2000
2022
2157
2253
4 August 1944
0448
0800
1915
2000
2043
0450
0800
1934
2000
2015
0500
0800
1937
2000
7 August 1944
0502
Submerged.
Position Lat.31°19'1", Long.132°31'E.
Surfaced. Radr contact on Komatsu Yama bearing 2720T. Patrolling in moon beam.
Position Lat.51°40'1", Long.132°12'E.
S.J. Aircraft Contact(#10) bearing 3350T at 6 miles. Checked on S.J. and had two planes, 6 & 12 miles. Probable radar interference was observed. If these night planes have radar it seemed relatively ineffective. They apparently patrol areas near beams out to about 120 miles east of Kyushu Island.

6 August 1944
0450
0800
1937
2000
2015
0500
0800
1937
2000
7 August 1944
0502
No sights. Overcast and light rain. Submerged.
Position (E.F.) Lat.15°1'N, Long.132°23'E.
Surfaced. Overcast and Heavy Seas.
Position Lat.31°19'1", Long.132°20'E.
Scheduled to change area tonight.

- 6 -

— page 113 —
0800 Estimated Position Lat.31°30'N, Long.133°38'E.
1924 Surfaced.
2000 Position Lat. 31°26'N, Long.133°38'E.

8 August 1944

0:55 Submerged.
0800 Position Lat.31°50'N, Long.133°42'E.
1939 Surfaced.
2000 Position Lat.31°45'N, Long.133°02'E.

9 August 1944

0000
hills patrolling in moon beam on course 100°T made radar contact on port beam, bearing 355°T, 14,000 yards. Ship contact (42) appeared to be three targets with one good size plp. Common-cod tracking. Target crawling aft on estimated course of 190°T.
0012 Changed course to 230°. Range began opening so spooked up and changed course to 270°T and shortly to 350°T.
0027 TDC set up checked well with targets on course 300°T, speed 15.5 knots. Range now 17,750 yards Continued tracking on 350°T until
0107
Nils four main generator on line we were not able to close the range. It became apparent that we were playing a loosing game as possibility of gaining attack position before dawn or before the ships reached Bungo Suido Strait was remote indeed. Our best speed varied between 15.5 - 13.5 knots under existing sea conditions. Believe those three targets to be men-o-war, possibly cruiser with two destroyer escorts, head for Bungo Suido at 15 knots on course 300°T (down moon beam) with moderate zigs.
0240 Discontinued chase and resumed patrol in moon path
0:45 Submerged.
0200 Position Lat.31°41'N, Long.135°45'E.
1936 Surfaced.
2000 Position Lat.31°27'N, Long.134°27'E.

10 August 1944

0:41 Submerged.
0800 Position Lat.31°56'N, Long.133°38'E.
1950 Surfaced.
2000 Position Lat.31°50'N, Long.133°48'E.

— page 114 —
11 August 1944

0:45
0800
1929
2000

Submerged.
Position Lat.31°48'1N, Long.13°38'1E.
Surfaced.
Position Lat.31°42'1N, Long.13°41'1E.

12 August 1944

0:45
0800
1932
2000

Submerged.
Position Lat.31°41'1N, Long.13°41'1E.
Surfaced.
Position Lat.31°19'1N, Long.13°35'6E.
Scheduled to shift to another area tonight.

13 August 1944

0311
0400
0200
2000

Submerged.
Position Lat.32°15'1N, Long.13°45'1E.
Surfaced.
Position Lat.32°25'1N, Long.13°45'1E.

14 August 1944

0:47
0800
1920
2000

Submerged.
Position Lat.32°28'1N, Long.13°53'1E.
Surfaced.
Position Lat.32°35'1N, Long.13°59'1E.

15 August 1944

0502
0800
1920
2000

Submerged.
Position Lat.32°15'1N, Long.13°41'1E.
Surfaced.
Position Lat.32°35'1N, Long.13°56'1E.

16 August 1944

0502
0800
1920
2000

Submerged.
Position Lat.32°15'1N, Long.13°41'1E.
Surfaced.
Position Lat.32°35'1N, Long.13°56'1E.

17 August 1944

0454
0800
1925
2000

Submerged.
Position Lat.32°26'1N, Long.13°35'8E.
Surfaced.
Position Lat.32°35'1N, Long.13°40'7'1E.

- 8 -

— page 115 —
18 August 1944

0488 Submerged.
0800 Position Lat.32°15'N, Long.135°15'E.
1920 Surfaced. Set course for another area.
2000 Position Lat.32°19'N, Long.135°33'E.

19 August 1944

0700 Submerged.
0800 Position Lat.30°58'N, Long.135°33'E.
1719 Surfaced.
2000 Position Lat.30°48'N, Long.134°11'E.

20 August 1944

0730 Submerged.
0800 Position Lat.30°15'N, Long.134°56'E.
1620 Surfaced.
2000 Position Lat.30°30'N, Long.135°03'E.

21 August 1944

0800 Position Lat.30°23'N, Long.136°53'E.
0818 Submerged.
1620 Surfaced.
2000 Position Lat.30°25'N, Long.137°15'E.

22 August 1944

0800 Position Lat.31°09'N, Long.136°48'E.
0901 Submerged.
1521 Surfaced.
2000 Position Lat.30°23'N, Long.136°57'E.

23 August 1944

0800 Position Lat.30°49'N, Long.135°57'E.
1127 Submerged.
1623 Surfaced.
1500 Convoy reported southeast of our present position.
1700 Changed course to 1430T to intercept at dawn estimated position.
2000 Position Lat.30°24'N, Long.137°21'E.
2140 Dapertoa area.

— page 116 —
24 August 1944

0255 Slight radar interference on starboard bow. During ramainder of morning interference became increasingly more evident. 0456 Submerged on convoy track several miles ahead of its dawn position using 10 knots speed. Visibility excellent. Sea calm. 0800 Position Lat. 29°35'N, Long.136°00'E. 1510 Surprised and began surface search patrol. Con- trary other radar readily altered base course or had very slow speed of advance. 1730 Channel course to east. 2000 Position Lat.29°02'N, Long.158°55'E. 2114 Radar Contact bearing 065°T, 14,000 yards. (Ship Contact #3). Commenced tracking. Radar screen showed one large pip and two indistinct small pips which were on same bearing and on either side of large pip. 2124 TDC and plot first indicated target on course 210° then later on course of 320°T, and speed 10 knots. 2125 Commenced approach and while changing course two of the three pips were lost, only remaining pip showed radical zig to loft. 2129 Steadied on 280°T and continued tracking while making 9 knots. TDC and plot now indicated target was on course 230°T, speed 10 knots. 2139 Target challenged, with two or three characters, on searchlight at range of 15,500 yards. Changed course to 230°T and opened out. Target was not visible and radar interference not apparent. It seems possible that the escort with the light could have been closer than 15,000 yards and undetected by the S.J. The performance of the S.J. and been such that it seems incredible that it should have missed a ship at a closer range. 2141 Lost radar contact. Assuming that main target was on a generally southerly or southeasterly course since original contact was on port bow, and that escort that challenged was radar equipped, commenced and around to loft on courses 230°T to 080°T. Hoped to make contact again to eastward with main target. 2330 Secured from battle stations after no further contacts developed. The night was dark and sea calm. Such a rapid detection of us at the long range by the escort was truly disconcerting. Opportunity for a successful attack seemed remote indeed.

- 10 -

— page 117 —
25 August 1944
Enroute Midway. Daily trim dive.
Position Lat.29°18'N, Long.142°02'E.
Position Lat.29°59'N, Long.144°35'E.

: 26 August 1944
Enroute Midway. Daily trim dive.
Position Lat.30°20'N, Long.147°16'E.
Set clocks to conform to (-10) zone time.
Position Lat.30°26'N, Long.149°37'E.

: 27 August 1944
Enroute Midway.
Position Lat.30°42'N, Long.152°22'E.
Position Lat.30°49'N, Long.155°27'E.

: 28 August 1944
Enroute Midway.
Position Lat.30°40'N, Long.158°37'E.
Rigged two submarines on opposite course.
Relieved to be SUNFISH and SCABARDFISH.
Position Lat.30°43'N, Long.161°37'E.

: 29 August 1944
Enroute Midway.
Position Lat.30°35'N, Long.164°56'E.
Trim dive.
Position Lat.30°25'N, Long.167°27'E.

: 30 August 1944
Enroute Midway.
Position Lat.30°10'00"N, Long.170°00'E.
Sent TUNA Three to Comsubpac.
Trim dive.
Sent TUNA Four to Comsubpac.
Position Lat.29°44'N, Long.172°11'E.

: 31 August 1944
Enroute Midway.
Position Lat.29°32'N, Long.174°00'E.
Position Lat.29°14'N, Long.176°15'E.

- 11 -

— page 118 —
1 Sept. 1944
Enroute [LOW: text here]
Position [LAT: 28°05' N, LONG: 178°21' E]
Crossed 180th Meridian. Changed date to 31 Aug.
Position Lat. 28°16'N, Long. 179°24'W.

1 Sept. 1944
0530 Y Sighted plane escort.
0812 Y Arrived [LOW: text here] Received 20,000 gallons fuel.
1430 Y Departed [LOW: text here] for Pearl Harbor.

2 Sept. - 5 Sept.
Enroute Pearl Harbor.
0825 Y September 2, sent TUNA Five to Consubpacc.
1100 WX September 5, arrived Pearl Harbor.

— page 119 —
1. U.S.S. TUN. - Report of Eloventin Per Fetrol.

C. SATHER

The weather in general was very good with the exception of a few days 25 - 31 July, during which time a raging typhoon cast its vulgar disposition upon the sea around us. Star sights were obtained with the exception of Z day.

D. TITLAL INFORMATION

Data on fairly consistent currents were obtained in areas covered by this patrol and are noted below for information:

| Mean Position | Sct | Drift | Date       |
||-----|-------||
| 29-21 N       | 055 | .7    | 25-23 July |
| 135-50 E      |     |       |            |
| 29-11 N       | 205 | 1.3   | 23 July     |
| 155-10 E      |     |       |            |
| 30-20 N       | 040 | .75   | 27 July     |
| 132-50 E      |     |       |            |
| 30-37 N       | 350 | 1.2   | 27-28 July  |
| 132-21 E      |     |       |            |
| 30-35 N       | 020 | 1.5   | 28 July     |
| 131-55 E      |     |       |            |
| 30-41 N       | 010 | 1.5   | 28-29 July  |
| 131-52 E      |     |       |            |
| 30-45 N       | 345 | 1.4   | 30 July     |
| 132-30 E      |     |       |            |
| 30-53 N       | 050 | 1.5   | 31-1 Aug   |
| 132-40 E      |     |       |            |
| 31-35 N       | 055 | 2.3   | 1 Aug      |
| 132-35 E      |     |       |            |
| 31-37 N       | 045 | 2.0   | 1-2 Aug    |
| 132-26 E      |     |       |            |
| 31-37 N       | 040 | 2.5   | 2 Aug      |
| 132-20 E      |     |       |            |
| 31-43 N       | 047 | 2.5   | 2-3 Aug    |
| 132-34 E      |     |       |            |

- 13 -

— page 120 —
U.S.S. TULSA - Report of Eleventh Year Patrol.

| Mean Position | Set | Drift | Date       |
||-----|-------||
| 31-44 N       | 055 | 2.3   | 3 Aug     |
| 132-50 E      |     |       |            |
| 31-26 N       | 046 | 1.4   | 3-8 Aug   |
| 132-50 E      |     |       |            |
| 31-30 N       | 026 | 1.7   | 4 Aug     |
| 132-30 E      |     |       |            |
| 31-42 N       | 015 | 3.5   | 5-8 Aug   |
| 132-18 E      |     |       |            |
| 32-00 N       | 025 | 3.0   | 5 Aug     |
| 132-35 E      |     |       |            |
| 31-32 N       | 041 | 1.5   | 6 Aug     |
| 132-25 E      |     |       |            |
| 31-23 N       | 065 | 1.0   | 7 Aug     |
| 133-32 E      |     |       |            |
| 31-37 N       | 052 | 2.0   | 7-8 Aug   |
| 133-45 E      |     |       |            |
| 31-47 N       | 072 | 1.0   | 8 Aug     |
| 133-56 E      |     |       |            |
| 31-45 N       | 069 | 1.5   | 9-10 Aug  |
| 133-46 E      |     |       |            |
| 31-57 N       | 055 | 1.4   | 10 Aug    |
| 133-44 E      |     |       |            |
| 31-55 N       | 065 | 1.4   | 10-11 Aug |
| 133-13 E      |     |       |            |
| 31-43 N       | 116 | 0.9   | 11 Aug    |
| 133-27 E      |     |       |            |
| 31-31 N       | 063 | 1.4   | 11-12 Aug |
| 133-09 E      |     |       |            |
| 31-31 N       | 110 | 0.9   | 12 Aug    |
| 133-09 E      |     |       |            |
| 31-55 N       | 0.9  | 1.1   | 12-13 Aug |
| 133-04 E      |     |       |            |
| 32-30 N       | 096 | 1.8   | 13 Aug    |
| 135-40 E      |     |       |            |

- 1-4 -

— page 121 —
15-12N 125-45E
: 32-12N 135-10E
: 32-09N 135-23E
: 32-35N 135-45E
: 32-22N 135-27E
: 32-25N 135-52E
: 32-23N 135-33E
: 32-15N 135-20E
: 32-15N 135-03E
: 32-29N 135-19E
: 31-59N 135-11E
: 30-53N 135-04E
: 30-14N 135-20E
: 30-12N 135-12E
: 30-20N 135-07E
: 30-17N 137-08E

E. NAVIGATIONAL AIDS.

Radar bearings and approximate ranges could be obtained out to 50 miles east of Kyushu and could have been of value in the absence of celestial fixes.

- 15 -

— page 123 —
1 2 3 4 5
Date : July : July : July : July : Aug
: ( -11) : ( -11) : ( -11) : ( -9) :
Tide (Zone) : 0:35:09-59:10-28:10-32:31-35:
Position: Lat. N. : 170- : 170- : 170- : 170- : 170- :
Long.E. : 25 : 25 : 25 : 25 : 25 :
Speed : 15 : 15 : 15 : 15 : 9.5 :
Course : 000 : 000 : 000 : 000 : 205 :
Trim : Surf : Surf : Surf : Surf : Surf :
:Inutes Sinco Last : : : : : 3 Hrs :
SD Radar Search : : : : : : :
Number : : : : : : :
Type : Unk. : Unk. : Unk. : Unk. : Unk. :
Probable Mission : Pat : Pat : Pat : Pat : Pat :
How Contacted : 0 : 0 : 0 : 0 : 0 : 5J :
Initial Range : 30 : 12 : 11 : 25 : 5 :
Elevation : - : - : - : - : - :
Range & Relative : : : : : : :
Bearing of : lano : HD : HD : HD : HD : HD :
When It Detected : : : : : : :
S/M : : : : : : :

(State (Sea- : : : : : : : 3 :
Sea: ( : fort) : : : : : : :
: (Direction(Rol) : : : : : : 230 :
Visibility (Miles) : : : : : : 5 :
Clouds: ( : : : : : : : 3000 :
(Forent : : : : : : : : 80 :
Overcast : : : : : : : : 000 :
: (Bearing(Rol) : : : : : : : : 000 :
Ioon: ( : : : : : : : : 75% :
(Forent : : : : : : : : 75% :
Illun. : : : : : : : : 75% :

Type of S/M Convoyage on this patrol. Dark.

- 17 -

— page 124 —
2 3 4 5 6 7 8 9 10
Date: 2 3 4 5 6 7 8 9 10
Time (Zone): (9) (9) (9) (9) (9) (9) (9) (9)
Position: Lat. N. : 31-34:31-36:31-25:31-28:31-42:
    Long. E. : 130-135 : 54 : 54 : 07 :
Speed : 14 : 9.5 : 5.5 : 9 : 5.5 :
Course : 345 : 135 : 135 : 0000T: 125 :
Trin : surf : surf : surf : surf : surf :
...Inutes Since Last : 2.5 : : 1.5 : 38 :
SD Radar Search : Hrs. : 45 : 1 Hr. : Hrs. : 0 :
Number : 1 : 3 : 1 : 1 : 2 :
Type : Unk : Unk : Unk : Unk : Unk :
Probable :ision : Pat : Pat : H : H : Pat :
How Contocted : SJ :

— page 125 —
11
Date : Aug : : : : :
Time (Zone) : 0311
Position: Lat. N. : 32-09 : : : :
    Long. E. : 16 : : : :
Speed : 9 : : : : :
Course : 085 : : : : :
Trim : Surf : : : : :
Minutes Since Last : 7½ : : : : :
SD Radar Search : Hrs. : : : : :
Number : 1 : : : : :
Tilt : - : : : : :
Firable Mission : Pat : : : : :
RHY Contacted : SJ : : : : :
Critical Range : 13 : : : : :
Elevation Angle : - : : : : :
Range & Relative : : : : : :
Bearing of Plane : ND : : : : :
When It Detected : : : : : :
S/R. : : : : : :

(State (Beau- : 1 : : : : :
Sea: (fort) : 072 : : : : :
(Direction (Rel): 6 : : : : :
Visibility : 6 : : : : :
(Height in
Clouds: (Ft. : 2000 : : : : :
(Fercent : 10 : : : : :
Overcast : 10 : : : : :
(Bearing(Rel) : 000 : : : : :
Nicon:(Angle : 330 : : : : :
(Percent : 40% : : : : :
Illum. : : : : : :

Type of S/H Camouflage on this patrol : Dark.

— page 126 —
CONFIDENTIAL

U.S.S. TUNA - Report of Eleventh War Patrol.

H. ATTACK DATA.

None.

I. MINES.

None encountered.

J. ANTI-S/M MEASURES AND EVASIVE TACTICS.

Anti-Submarine measures encountered are listed.

1. Radical Zig-Zag plans used even on dark nights.
   Radical changes of course at dawn and dusk.

2. Radar equipped escorts who would run down the bearing of the submarine to keep it away from the convoy. The convoy would then make a large course change.

3. Large ratio of escorts to ships in convoy.
   (a) 1st contact 4 escorts for 1 ship.
   (b) 2nd contact 2 escorts for 1 ship (high speed)
   (c) 3rd contact 2 escorts for 1 ship.

K. MAJOR DEFECTS AND DAMAGE.

None.

L. RADIO.

Normal and satisfactory operation of equipment. Receiving conditions good in area. 9090 kcs used with shift to 14390 in early morning hours.

N. RADAR.

S.D. radar operated satisfactorily, obtaining ranges up to 30 miles on planes. The use of the OAO-1 wave meter with this equipment greatly facilitates the tunning of the pre-amplifier and oscillator convertor.

— page 128 —
35-12N, Long.132007.5°E.
C. True bearing of interference (Radar or Jamming).
Radar interference (Radar or Jamming

— page 130 —
U.S.S. TULIP - Report of Elevating Patrol.

C. PERSONNEL.

The personnel in this vessel are considered exception-ally well trained. School was held twice a day during the entire patrol for the unqualified men and those not so well qualified. Carefully prepared outline of the course of instruction was used in order to devote appropriate time to the subject matter.

Lower ratings have been trained for floating up into the gaps made by older men being ordered to new construction. There are two ratings, however that always seem to offer difficulty.

1. Chief of the Boat.
2. Chief Electrician.

By the time a lower rating has been trained to float up to either of these positions he has been on board long enough to be transferred to new construction and off he must go. The answer is not apparent.

a. No. of men on board during patrol......75
b. No. of men qualified at start of patrol......49
c. No. of men qualified at end of patrol......64
d. No. of unqualified men making their last patrol......9
e. No. of men advanced in rate during patrol......19

A. TILES STEELED - FUEL USED.

Lajuro to area......312 miles 35,520 Gal.
In area......3923 " 25,625 "
...rea to lidway......2605 " 36,880 "
...lidway to Pearl......1320 " 21,430 "
...rea to Pearl......3925 " 58,310 "

B. DURATION

Days enroute to area......10
Days in area......29
Days enroute to base......14
Days submerged......28

T. FACTORS OF DURATION REMAINING.

Torpedoes Fuel - 12 Days
   24......12,400 Gal.
   12 Days
   15 Days

Factor limiting this patrol - Operation Order.

U. REMARKS.

None.

— page 132 —
FC5-4/A16-3
Serial 0344
CONFIDENTIAL
SECOND ENDORSEMENT to:
U.S.S. TUNA Report of
Eleventh 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. TUNA - Report of Eleventh War Patrol.

1. Forwarded, concurring in the remarks of Commander Submarine Division FORTY-FIVE, who has fully covered the patrol in his endorsement.

C. F. ERCK.

— page 133 —
1. 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. TUNA (SS203) - Report of Eleventh War Patrol.

1. The eleventh war patrol of the TUNA was conducted in Empire waters south of Honshu.

2. This long patrol in enemy waters resulted in only three radar contacts, none of which, unfortunately, could be developed into attacks.

3. This patrol is not designated as "Successful" for Combat Insignia Award.

DISTRIBUTION:
(Complete Reports)
| Code | Name |
|------|------|
| CNO  | (7) |
| CINCPAC | (5) |
| LANTEL.Cen.Pac.Ocean Areas | (1) |
| Conservpac | (1) |
| Cinclant | (1) |
| Consusblant | (8) |
| S/M School, NL | (2) |
| Consopac | (2) |
| Consowospac | (1) |
| Consubswospac | (2) |
| CTF 72 | (2) |
| Comnorpac | (1) |
| Consubspac | (20) |
| SUAD, MI | (2) |
| ConsubspacSubordcom | (3) |
| All Squadron and Div. | (2) |
| Commanders, Pacific | (2) |
| Substrainpac | (2) |
| All Submarines, Pacific | (1) |

C. A. LOCKWOOD, Jr.

RECEIVED S-C FLIES
23 Dec 1954
NONE TO: 36 SEP 1944
B-16-17
SEP 5 1944
RECEIVED
S-16-17
E. L. HYNES, 2nd, Flag Secretary.

— page 134 —
SS203/A16-3
Serial (014)
C-O-DECLASSIFIED
N-TI-A-L
From: The Commanding Officer.
To: The Commander-in-Chief, United States Fleet.
Via: Official Channels.
Subject: U.S.S. TUNA - Report of Twelfth War Patrol.
Enclosure: (A) Subject Report.
(B) Track Chart (ComSubPac only).

1. Enclosure (A) covering the twelfth war patrol of this vessel, conducted in the area between Formosa and Luzon, is forwarded herewith.

2. During this patrol the HADOCK, HALIBUT and TUNA operated as a coordinated attack group.

FINALIZED
100831

— page 135 —
1. PROLOGUE.

Arrived Submarine Base, Pearl Harbor, T.E., on Sept. 5, 1944 from Eleventh War Patrol. Had normal refit by Submarine Base and relief crew of SubDiv 45. Dry docked in ARD 2.

During refit the following major repair items were accomplished: Overhauled #2 & #5 Main Engines; overhauled both air compressors and both turbo-blowers; installed AFR-1 and SPA-1; pulled both propellor shafts; checked and renewed as necessary pins in all floods valves; replaced #1 periscope; installed booster cooling unit in Control Room; all sound gear overhauled, $151 lifted and overhauled at gun shop.

Commenced 10 day training period on Sept. 25, 1944, which included a three day Convoy Exercise with SEAFOX and HALLEUT.

(B) NARRATIVE.

8 Oct.

1340 VW Departed Pearl Harbor in company with U.S.S. HADDOCK and U.S.S. HALLEUT, escorted by PC 483.

8 Oct. to 19 Oct.

Enroute Saipar. Conducting daily training dives, emergency drills and battle problems. Alternated with HADDOCK and ATIBUT as target vessel for radar tracking problem and submerged approaches.

19 Oct.

0800 I Made rendezvous with escort (PGI-9) and proceeded to Saipar.

1215 I Hooded alongside U.S.S. HOLLAND in Tanapag Harbor, Saipar. Received 45,000 gallons fuel oil and 835 gallons lube oil. Made minor voyage repairs.

20 Oct.

Alongside U.S.S. HOLLAND.

— page 136 —
21 Oct.

1433 I: Departed Tanapag Harbor, Saipan - in company with U.S.S. HADDOCK and U.S.S. HALIBUT - escorted by PGH-9.
1935 I Escort departed. Entered safety lane.
1941 I Made trim dive.
1956 I Surfaced.

22 Oct.

0525 I Dove.
0535 I Surfaced.
0600 I Sighted PB2Y - distance 12 miles. Plane did not close. (Plane contact #1).
0631 I Plane contact on SD radar - distance 5 miles and closing. Dove. As diving alarm sounded C.O.D. sighted PB2Y in overcast almost overhead - altitude 1,500 feet. (Plane contact #2).
1432 I Plane contact on SD radar - distance 5 miles. Dove. (Plane contact #3).
2326 I Ship contact on SJ radar - bearing 286°T - range 11,500 yards. Tracking showed target on course 110°T. Speed 15.
2342 I Ship contact on SJ radar - bearing 112°T - range 12,700 yards.
   Believe these contacts were PARCHE and SAILFISH, both of whom were reported to be in vicinity. Attempt to exchange recognition signals failed, although radar interference from both was very pronounced.

23 Oct.

0538 I Dove.
0555 I Surfaced.
1013 I Sighted PB2Y - distance 10 miles. Plane did not close. (Plane contact #4).
1300 I Plane contact on SD radar - distance 22 miles. Lost contact at 24 miles. (Plane contact #5).
1440 I Made practice "Hand Dive".
1455 I Surfaced.

24 Oct.

0602 I Dove.
0614 I Surfaced.
0758 I Sighted "Emily" type flying boat - distance 15 miles. Dove. (Plane contact #6).

— page 137 —
1035 I Plane contact on SD radar - distance 24 miles.
Lost contact at 25 miles. (Plane contact #7).
1040 I Regained SD contact with plane at 19 miles.
1041 I Sighted high flying seaplane (type unknown) at
range of 20 miles.
1050 I Lost all plane contacts.
1500 I Dove.
1556 I Surfaced.
1600 I Commenced closing HADDOCK to transmit message
by keying SJ.
1700 I Entered Convoy College Safety Lane.
1925 I Beginning of a series of "phantom pips" on SJ
screen. In a calm sea on a bright moonlight
night large pips were indicated at ranges from
1,000 yards to 4,000 yards.

25 Oct.

0702 I Dove.
0933 I Surfaced.
0937 I Sighted two large "Emily" type patrol planes -
distance 15 miles and closing. Dove. (Flane
contact #8).
1002 I Heard distant explosions.
1014 I More distant explosions.
1247 I CTG 17.12 assigned new patrol assignment.
1400 I On assigned station.
1656 I Made deep dive.
1729 I Surfaced.
1933 I Sighted heavy gun fire bearing 150°T.
2035 I CTG 17.12 assigned new patrol station.
2050 I Last of heavy gun fire flashes.
    : such radar interference on APR throughout
    the night.

26 Oct.

0523 I SJ radar contact bearing 000°T - range 12,000
yards. Radar interference indicated possible
friendly sub and when range closed to 10,000
yards exchanged recognition signals and calls
with HADDOCK by keying SJ.
0828 I Dove.
0835 I Surfaced.

— page 138 —
1428 I Received instructions to proceed to regularly assigned area and carry out normal patrol.
: 2013 I Converted #5 Fuel Ballast Tank into a Main Ballast Tank.
: 2130 I Dove to flush out #5 MBT.
: 2141 I Surfaced.

27 Oct.

: 0200 I SJ radar picked up Diogo Island bearing 2700T - distance 65,000 yards.
: 0430 I Passed Diogo Island abeam to starboard - distance 5 miles.
: 0631 I Dove.
: 0655 I Sighted "Betty" type plane thru periscope - distance 10 miles. (Plane contact #9).

1844 I Surfaced.

28 Oct.

: 0636 I Dove.
   - Listened in on Fack Frequency first ten minutes of each odd hour GCT using SD mast as antenna.
: 1844 I Surfaced.
: 1945 I Entered assigned area.

29 Oct.

: 0655 I Dove.
   - Patrolling along Blind Bombing Area extremity.
: 1550 I Surfaced.
: 1600 I Sighted many life rafts and life jackets. Most of the rafts had provisions lashed to them, but no Nips were in evidence.
: 1730 I Sighted "Pete" type plane - distance 10 miles.
: 1740 I Dove. (Plane contact #10).
: 1849 I Surfaced and exchanged position reports with HADDOCK and HALIBUT.

30 Oct.

: 0703 I Dove.
: 0705 I Negative flood valve out of commission. (See list of defects).
   - Depth control difficult throughout the day due to rip tides and choppy sea. Broached several times and frequently dropped to 80 feet suddenly.

— page 139 —
1829 I  Surfaced.

31 Oct.

0013 I  Received instructions from CTG 17.12 assigning new patrol station and to take position on scouting line.

0415 I  On assigned station - circling.

0611 I  Received message from CTG 17.12 to commence search on course 2500T - speed 17 knots.

0937 I  Sighted submarine ahead - distance 8 miles - crossing from port to starboard.

0950 I  Exchanged recognition signals and calls with HALIBUT who was trailing a 16.5 knot target with one escort. Held course and speed continuing search.

1057 I  Sighted "Betty" type plane - distance 8 miles - flying high. Did not close so remained on surface. (Plane contact #11).

1215 I  Sighted "Emily" type plane - distance 4 miles - closing. Dove. (Plane contact #12).

1303 I  With nearest land 175 miles from present position, there seems to be an unusual amount of air activity.

2130 I  SJ radar contact bearing 0900T - range 30,000 yards. Appears to be one large target with two radar equipped escorts. Commenced tracking. (Ship contact #1).

2135 I  Went to battle situation. Tracking showed target making 9 knots and zigging between courses 1800 and 2400. Target was clearly visible at 18,000 yards in a bright full moon. Sea condition 3.

2338 I  Dove to attack with range 12,000 yards. Escorts were about 2,000 yards ahead of target and appeared to be large R.O.T. Put target astern in order to get a following sea for better depth control. Came to radar depth, but decided sea was too rough and moon too bright to attempt this type of approach. Freighter identified as London Icarus type.

1 Nov.

0025 I  With torpedo run of 2,900 yards - depth setting 10 feet - gyro angles 1870 to 1910 - 230 starboard track angle - using divergent spread - fired four Ikarus 18 torpedoes at 10 second intervals.

- 5 -

— page 140 —
0027 I Target made 20° zig to right. All torpedoes missed.
    With an escort echo ranging on each quarter at ranges of 1,000 - 2,000 yards, went to 500 feet and rigged for depth charge.
: 0034 I Two end of run explosions. This alerted escorts who then conducted extensive search, but no depth charges were dropped.
: 0109 I Surface and reported attack completed to CTG 17.12.
: 0150 I CTG 17.12 directed us to try another end around to starboard.
    Upon surfacing found that we had drawn one escort well to the East - the freighter and other escort maintaining their course and speed.
: 0200 I Commenced end around, to starboard maintaining a range of 12,000 yards on target. Lost contact with escort that had been drawn off to Eastward.
: 0250 I FC escorting freighter commenced closing range rapidly leaving freighter to look out for himself.
: 0300 I Freighter commenced making radical changes of course in all directions and for almost two hours it was impossible to tell what was going to be port flank, starboard flank, or position ahead.
: 0445 I With freighter and ourselves on Easterly course, picked up one escort on our starboard bow and 9,000 yards respectively.
: 0446 I Escort on starboard bow opened fire - followed by freighter and other escort. Went ahead full speed and commenced opening out to North.
: 0447 I #I Main Engine out of commission (See list of defects) With escorts closing slowly and with large pips from shell fire showing up on SJ screen, decided to dive.
: 0448 I Dove.
    One escort remained in vicinity but did not make sound contact.
: 0640 I All clear - surfaced.
: 0650 I Commenced search on course 240° - speed 15.
: 1230 I Received message from CTG 17.12 assigning new station.
: 1300 I Dove.
: 1854 I Surfaced.
2 Nov.
: 0000 I In scouting position - line of bearing 040°T - course 040°T - speed 12.
: 0717 I Dove.
: 0728 I Surfaced and commenced zig-zagging.

— page 141 —
1115 I  Periscope sighted dead ahead - distance about 3,000 yards. 0.0.D. rang up "emergency" and reversed course. About 10 feet of periscope remained in sight during entire turn and all bridge personnel saw it. Almost simultaneously with the sighting of the periscope, the HADDOCK, who was 7 miles ahead, reported sighting a periscope and was avoiding to Eastward.

Just prior to getting the "emergency" bell in the Engine Room, engine room personnel reported they heard a torpedo pass down the port side. If any torpedoes were fired they wore "wackless" as the sea was flat calm and there were no visual indications.

1155 I  Plane on SD radar - distance 6 miles and closing. Dove. (Plane contact #15). As bridge was being cleared, quartermaster sighted "Betty" coming in. One bomb close aboard and overhead as depth gauge indicated 100 feet.

1357 I  Surface. Because of a low overcast and being a considerable distance from the nearest land, used SD radar for first time sufficient arriving in area. The bombing seemed sufficient for the area and that the APR is as effective and certainly more secure.

1350 I  Sighted sub on surface thru high periscope bearing 260°T - distance 12,000 yards. Sub dove almost immediately after sighting (Ship contact #2).

Believe this was Jap whose periscope was sighted previously.

1358 I  Enroute assigned station. Plane contact on SJ radar - distance 10 miles. Did not close. (Plane contact #14).

3 Nov.

0045 I  Plane contact on SJ radar - range 12,000 yards. Closed quickly to 10,000 yards. Dove. (Plane contact #15).

0107 I  Surface.

0415 I  Circling on station.

0850 I  Closed HADDOCK to send message on SJ radar.

0918 I  Formed scouting line - course 030° - speed 12.

— page 142 —
1053 I Increased speed to 14 knots.
: 1700 I Sighted lifeboat - closed to investigate. No occupants.
: 1816 I Dove.
: 1836 I Surfaced.
: 1912 I Received instructions from CTG 17.12 to "Proceed patrol own assigned area independently".

4 Nov.

0645 I Dove on course 060°T to conduct submerged patrol in Safety Lane enroute assigned area.
1505 I Sighted mast on horizon, (Ship contact #5). Went to battle stations and headed toward target. As range closed could make out 4 ships - the leader being identified as a PF-UNL (described in Sext. 20, 1944 edition of C.N.I., pages 3010 and 3011). On each quarter at distances of approximately 3,000 yards were PC type escorts and at 3,000 yards on leading vessels starboard quarter was another PF-UNL type escort. Tracking showed targets on base course 340° - speed 9 knots - apparently patrolling between Seltang Island and countertop of Formose. The depth charge racks on the nearest PF-UNL were well loaded and, from all aspects, this looked like the Jap version of a "Hunter-Killer" group. Firing was heard on 15, 18, and 21 Kc's. Permitted nearest escort - a PC - to pass ahead at a range of 3,000 yards and continued on an Easterly course in hopes of finding larger ships astern. Nothing materialized.
1640 I Secured from battle stations.
1833 I Surfaced and sighted small patrol vessel thru periscope - bearing 330°T - range 12,000 yards. Believe this was one of the 4 ships previously sighted. (Ship contact #4). Opened out to Eastward.
1840 I SJ radar reported out of commission.
2026 I Sighted Itbayat Island - bearing 086°T - range 18 miles. Between rain squalls got sufficient bearings on Ibaduls, North and Yami Islands to pilot way thru Bashi Channel.
2300 I SJ Radar back in commission.

5 Nov.

0631 I Dove 10 miles East of Koto Sho in low overcast and rough sea.

— page 143 —
1846 I  Surfaced and commenced closing East Coast of Formosa.
2100 I  SJ radar contact bearing 500°T - range 6,000 yards. Pip was very small and decided it was either a small patrol vessel or sampen off Taito. Avoided to Eastward.
    - Strong intermittent radar interference on 155 mcl's and 70 mcl's.

6 Nov.
0620 I  Dove between Koto Sho and Formosa.
1849 I  Surfaced.
    - Strong radar interference on 155 megacycles and 75 megacycles.

7 Nov.
0624 I  Dove between Kashiho and East Coast of Formosa.
1900 I  Surfaced and closed East Coast of Formosa.
2250 I  Received new area assignment from CTG 17.12.

8 Nov.
0622 I  Dove 5 miles north of Y'Ami Island in Bashi Channel.
1850 I  Surfaced and sighted 4 small patrol vessels to Westward. (Ship contact #5).

9 Nov.
0630 I  Wind and sea picking up considerably.
    - Depth control was difficult throughout the day. Rolled as much as 10° on each side at 120 feet.
1845 I  Surfaced in a heavy sea and driving rain from Northeast. Got radar fix on Y'Ami and North Islands and headed into sea.

10 Nov.
0000 I  Barometer 29.45 - raining continuously - wind force 9 from Northeast - sea condition 8.
1600 I  Wind from Southeast - barometer 29.34.

— page 144 —
11 Nov.

0430 I Barometer 28.97 - light wind - sea condition 8.
We're in the center of this one.
0500 I Wind from Northwest - force 10 - sea condition 9.
0530 I Barometer rising and wind shifting to North.
1656 I Storm has abated sufficiently to make 9 knots on
    Southerly course.  Enroute new area.

12 Nov.

0330 I In assigned area.  Weather remains unfavorable -
    wind force 6 - sea condition 6 from 3400T - low
    overcast.  No fix in 60 hours.
0705 I Dove to routine torpedoes.
0949 I Surfaced for sun line.
1030 I Dove.
1226 I Surfaced for sun line.
1324 I Dove.
1822 I Surfaced and closed Northeast coast of Luzon.
2224 I APR shows strong radar interference on 154 Hz's and
    SJ picked up several instantaneous pips at ranges
    between 10 and 15 miles.

13 Nov.

0638 I Dove 12 miles East of Didicas Rock.
1822 I Surfaced and commenced passage thru Balintang
    Channel.
1900 I Strong but intermittent radar interference on 155
    to
2100 I megacycles.

14 Nov.

0628 I Dove 15 miles Northwest of Dalupiri Island.
1854 I Surfaced and closed Northwest coast of Luzon.
2030 I Enroute new patrol station.  Occasional radar
    interference on 155 m/s.

15 Nov.

0810 I Dove on station.  Broached on odd hours G.C.T. for
    periscope sweep,  SJ radar sweep and to listen in
    on Pack Frequency.
1302 I Heard 10 distant explosions in rapid succession.

— page 145 —
1833 I  Surfaced.
    Strong radar interference on 155 megacyclcs.
: 2100 I  Got saturation indication of radar interference
    (155 mc!s) on APR and simultaneously obtained
    radar contact on SJ at range of 7,000 yards.
    Dove. (Plane contact #15).
: 2130 I  Surfaced, but prior to opening hatch, APR showed
    saturation indication so went back down.
: 2205 I  Surfaced.

16 Nov.

0500 I  Radar interference on SJ.
0550 I  SJ radar contact - range 8,000 yards.
0600 I  Exchanged recognition signals and calls with
    RATON by keying SJ.
0658 I  Dove.
1846 I  Surfaced.
2040 I  Radar interference on SJ.
2150 I  Exchanged recognition signals and calls with
    HADDOCK who assigned new area limits.

17 Nov.

0300 I  Wind velocity increasing - sea choppy.
    Wind force 6 - sea condition 6.
    Sea rough throughout day so headed toward
    open portion of area and remained on surface.

18 Nov.

0750 I  Dove in rough sea. Depth control difficult.
1850 I  Surfaced. Wind force 5 - sea condition 6.

19 Nov.

0728 I  Lookout sighted single engine plane (type unknown)
    bearing 1100T - distance 10 miles. Dove. (Plane
    contact #17). There was no radar interference
    on APR.
0810 I  Sighted "Betty" type plane thru periscope -
    distance 8 miles. (Plane contact #18).
1403 I  Sighted small sampan with single sail on South-
    erly course - bearing 1100T - range 7,000 yards.
    (Ship contact #5).
1500 I  SJ radar out of commission.
1550 I  Sighted what appeared to be a PF-UNL or DE-UNL
    type escort vessel - bearing 1200T - range 9,000
    yards - on a northerly course. With a large
    angle on the bow, and with a speed of about 15

— page 146 —
1845 I
Surfaced.

20 Nov.
0200 I SJ radar back in commission.
0700 I Dove.
1837 I Surfaced and proceeded to new area.

21 Nov.
0200 I SJ radar interference.
0230 I Exchanged recognition signals and calls with POWFRET.
0300 I Seas building up with large gwells from NWE.
    Wind force 4 - sea condition 5.
0701 I Sighted "Betty" type plane flying low in low overcast. SJ radar contact on same plane showed range to be 8,000 yards and closing fast. Dove. There was no radar interference on AP. (Flame contact #19).
    Depth control difficult because of large swells and tide rips.

1846 I Surfaced in rough sea.

22 Nov.
0703 I Dove on Easterly course to enter Safety Lane in hopes of getting clear of swells from Formosa Strait.
1840 I Surfaced.

23 Nov.
0650 I Dove for submerged patrol in Safety Lane.
1835 I Surfaced.
    Much interference on 155 megacycles until moonset.

24 Nov.
0410 I Passed thru Balintang Channel.
0620 I Dove 20 miles Northeast of Balintang Island.
1828 I Surfaced.

— page 147 —
1831 I Sighted single engine plane (type unknown) - distance 8 miles and heading toward. Dove. (Plane contact #20).
: 1855 I Surfaced.
: 25 Nov.
: 0639 I Dove.
: 0658 I Surfaced.
: 26 Nov.
: 0225 I Departed Eastern end of Convoy College Safety Lane.
: 0635 I Dove.
: 0654 I Surfaced.
: 27 Nov.
: 0615 I Dove.
: 0635 I Surfaced.
: 28 Nov.
: 0557 I Dove.
: 0631 I Surfaced.
: 1305 I 5D radar contact - distance 12 miles. Range closed to 5 miles without plane being sighted.
: 1307 I Dove. (Plane contact #21).
: 1334 I Surfaced.
: 1400 I Radar interference on APR at 173 megacycles.
: 1428 I Sighted plane in low clouds (type unknown) - distance 7 miles. Dove. (Plane contact #22).
: 1451 I Surfaced.
: 1500 I #3 main generator out of commission. (See list of defects).
: 1652 K Sighted 11 "Liberators" on Southernly course - flying high. Exchanged recognition flares and remained on surface.

: 29 Nov.
: 1500 K Enroute Midway.
: 2400 K Auxiliary generator control panel out of commission (See list of defects).
: 2400 K Auxiliary back in commission.

— page 148 —
30 Nov.
Enroute Midway.
0800 K Received instructions from ComSubPac to proceed
Saipan upon receipt routing instructions.
1142 K D've for unidentified plane, possibly B-24.
1500 K Changed course for Saipan. #3 main generator
back in commission.

1 - 2 Dec.
Enroute Saipan.
1300 K 2 December arrived Saipan.

(C) WEATHER.
Excellent weather prevailed during the first ten days in the area. After this, while operating off East coast of Formosa, wind was usually force 5 or 6 with general overcast. During the period Nov. 9 - 11 a severe typhoon was encountered. East of Luzon Strait, and unsettled weather prevailed until departure from area on Nov. 24. Winds of force 5 or 6, high swells and rip tides were usually encountered South of Formosa and West of 120° East Longitude.

(D) TIDAL INFORMATION.
Currents encountered in the area, West of Luzon Strait, agreed closely with data in H.O. -isc. No. 10,057A. East of Luzon Strait a generally NW current was noted varying from 1 knot off Batan Island, to 2.5 knots NE of Escarpada Pt., Luzon. Currents in Luzon Strait were always strong and in directions indicated by charts of this area.

(E) NAVIGATIONAL AIDS.
During passage of Luzon Strait via Salintang Channel good radar fixes were obtained on Balintang Island. Diogo, North and YAmis Islands in Baten Island group were also good radar landmarks for night passage of Strait.

— page 151 —
1. AIRCRAFT CONTACTS. (Cont'd)
   Time    Lat.&    Initial    Est. Course    How
   No.    Date    Long.    Type    Range    & Speed    Contacted    Remarks.
   -
   12.  1215-I   19-13 N    Emily    4 Mi.    2200    SD    Delivered to be air screen.
    51 Oct.  115-16 E
   13.  1155.I   20-18 N    Betty    6 Mi.    070    R    Submerged. Received one bomb at 100'.
    2 Nov.  115-47 E
   14.  2105.I   18-46 N    Not    10 Mi.    1570    R(SJ)    Did not close.
    2 Nov.  117-08 E    Sighted
   15.  (045 I   18-13 N    Not    6 Mi.    ---    R(SJ)    Range closed to 5 Mi.
    3 Nov.  117-24 E    Sighted    Submerged.
   16.  2100 I   19-25 N    Not    4 Mi.    ---    R(SJ)    Submerged. Plane had radar.
    15 Nov. 118-19 E    Sighted    AFR    Radar interference on
    155 kts.
   17.  0728 I   19-36 N    Unknown   10 Mi.    010°    SD    Submerged. Single engine,
    19 Nov. 119-15 E    low wing monoplane.
   18.  0810 I   19-35 N    Betty    8 Mi.    330°    P    Submerged. Low overcast.
    21 Nov. 118-00 E    Plane headed towards.
   19.  0701 I   00-11 N    Betty    4 Mi.    240°    SD    Submerged.
    21 Nov. 118-00 E
   20.  1011 I   00-37 N    Unknown    8 Mi.    160°    SD    Submerged.
    14 Nov. 122-47 E
   21.  1307 I   41-40 N    Not    12 Mi.    ---    R    Range closed to 5 miles.
    28 Nov. 142-16 E    Sighted    Submerged.
   22.  1428 I   21-40 N    Unknown    7 Mi.    ---    SD    Submerged.

— page 152 —
18 -

CONFIDENTIAL

U.S.S. TUNA - Report of Twelfth War Patrol.

(H) ATTACK DATA.

U.S.S. TUNA _ TORPEDO ATTACK NO. 1 _ P.TROL NO. 12_.

Time: 0025 I Date: 1 Nov. 14. Lat: 18-42 N Long: 114-31 E

TARGET DATA - DATAGE INFLICTED

Description: Convoy consisting of one Able King (London Heru type, page 212, 208J revised) and two radar equipped Peter Charles about 2,000 yards on either bow.

Ship(s) Sunk: None.

Ship(s) Damaged or Probably Sunk : None.

Damage Determined by: ---

Target Draft Course Speed Firing Range
28 fct 165°T 8 kts. 3,400 yds.

OWN SHIPS DATA

Speed Course Depth Angle(at firing)
2.5 kts. 219°T 60 ft. 30° down

FIRE CONTROL AND TORPEDO DATA

Target tracked on the surface using radar ranges and bearings to determine base course, zig plan and speed. Submerged approach using periscope bearings. Fired divergent spread of four (4) torpedoes.

— page 153 —
U.S.S. TUNA - Report of Twelfth War Patrol.

(H) ATTACK DATA (Cont'd)

TORPEDO ATTACK No. 1

Tubes Fired: No. 7, No. 8, No. 9, No. 10
Track Angle: 31.5°, 32.5°, 35.5°, 34.5°
Gyro Angle: 187°20', 188°27', 188°51', 190°51'
Depth Set: 10', 10', 10', 10'
Power: Electric, Electric, Electric, Electric
Hit or Miss: Miss, Miss, Miss, Miss
Erratic: No, No, No, No
Mark Torpedo: 18-1, 18-1, 18-1, 18-1
Serial No.: 56874, 54787, 53885, 54465
Mark Exploder: 8-5, 8-5, 8-5, 8-5
Serial No.: 10425, 10590, 10042, 10480
Actuation Set: Contact, Contact, Contact, Contact
Actuation Actual: --, --, --, --
Mark Warhead: 15-2, 18-2, 18-2, 18-2
Serial No.: 2971, 3147, 3448, 3588
Explosive: Torpex, Torpex, Torpex, Torpex
Firing Interval: 10 Sec, 10 Sec, 10 Sec, 10 Sec
Type Spread: 3, 3, 3, 3
Sea Conditions: Navy 128, Navy 128, Navy 128, Navy 128
Overhaul Activity: --, --, --, --

Remarks: Misses resulted when target zigged toward shortly after firing. Torpedoes were followed out on sound.

- 19 -

— page 154 —
CONFIDENTIAL
U.S.S. TULA - Report of Twelfth War Patrol.

(I) KINES.
None encountered.

(J) ANTI-S/M MEASURES AND EVASION TACTICS.

1. Sound.
All escorts and patrol craft encountered (with the exception of the PP-UNI sighted on Nov. 15, 1942) echo ranged continuously on 15, 16 and 21 Kc. In the attack on Nov. 1, 1942 both escorts shifted frequencies several times during the approach. Echo ranging was not effective for, at periscope depth with escorts on each coast at ranges of 1,000 - 2,000 yards, contact was not made.

2. Radar.
During the attack on Oct 31 - Nov. 1, 1942, strong radar interference was obtained by SJ, cut time over no indications on ARR. If the escorts were equipped with radar it was not effective, as range closed to 12,000 yards before submerging without being detected. All night flying patrol planes were radar equipped giving strong indications at 155 megacycles on ARR. By keeping ARR set at this frequency, except when covering entire band at 10 minute intervals, and by keying SJ at 2 minute intervals, it is believed that maximum coverage was attained with minimum chance of planes "homing" on SJ.

3. Escorts.
All indications are that the number of escorts per ship in convoy are increasing.

4. Patrol Craft.
The two sightings of a patrol vessels operating together gives indication of "functor-Killer" group tactics being used.

5. Evasion.
After the attack on Nov. 1, 1942 went to 500 feet under a 100 temperature gradient, and ran silent at slow speed. Escorts failed to make sound contact and no depth charges were dropped.

— page 155 —
30 Oct. discovered negative flood would not close. Investigation indicated a pin had fallen out or rusted away in negative flood valve operating linkage. During drydock period of last refit negative flood linkage was found to be satisfactory; safety flood valve was found to be disconnected from operating linkage due to missing pin. Negative tank was used during patrol, flooding thru safety. When negative was blown and vented pressure differential automatically closed flood valve.

2. While making full power and, shortly before diving on 1 Nov., a crankcase explosion occurred in lower crankcase of No. 1 main engine. The engine was stopped and investigation revealed that #1 lower piston skirt had broken, and had fallen into crankcase, leaving only piston head and one compression ring intact. The liner was not damaged as alignment was maintained by remaining portion of piston. The broken pieces of the piston caused no damage in the crankcase or to the adjoining gears at the control end of eng.ne. Repairing was effected and the engine put back in commission in 15 hours. This engine had been smoking (lub oil) excessively since leaving for patrol. Replacement of #1 lower piston rectified this condition.

The explosion was probably caused by full power load on this defective piston resulting in a clean break and consequent ignition of crankcase oil vapor by combustion gases escaping around the remaining compression ring.

3. The fuel compensation line, in engine room, developed numerous small leaks during patrol. These were controlled, where space permitted, by patches consisting of 1/8" layers of rubber, lead and steel. On Nov. 28 a zero ground developed in #3 main generator armature circuit. The bus terminal block was saturated with salt water, from additional leak in compensating line over generator, despite having a drip proof cover and being wrapped with glass tape. About one half pint of salt water entered generator through end bell housing. The inside of generator was washed with hot, fresh water and dried with lamp banks. Terminal was washed in same manner. #3 generator was out of commission about two days.

— page 156 —
U.S.S. TUNA - Report of Twelfth War Patrol.

(K) MAJOR DEFECTS AND DAMAGE (Cont'd).

On Nov. 29 a zero ground was found on the auxiliary generator shunt field. rheostats and resistors resulting from a salt water leak occurring in port main motor circulating water line. Resistors and master rheostat were washed with fresh water and dried. Auxiliary generator was out of commission about twelve hours.

It is believed the engine room compensating line leak is the result of corrosive action. The two leaks in main motor circulating water line (port and starboard) could be due to either corrosion or vibration as each is at a junction of circulating water line and compensating line.

These leaks present a potential hazard. The faulty sections should be renewed during refit and entire systems tested to test pressure.

(L) RADIO.

No major material failures. When test of wuzon Strait, reception on the new sub schedule was particularly bad between 1900-2100 GCT.

In the western portion of the area enemy interference was noted during sub schedules between 1100-1700 GCT.

(M) RADAR.

No major material failures. SJ radar was out of commission at various times due to tube failures and a faulty flexible shaft to PPI scope.

SJ could easily pick up land at 90,000 yards and the one worth-while ship contact was made at 50,000 yards.

The radar detector equipment (AN/SPA-1), (TN-2A/APR-1), (TN-3/APR-1) was of much value in indicating the presence of radar equipped planes at night. Following is a summary of interference obtained using TN-2A/APR-1 receiver:

- 22 -

— page 158 —
5-8 '44. Report #1

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or station Tuna (SS203)
2. Area covered on this mission - East coast of Formosa between Taio and Geran Bl. 5-8 Nov. 1944.
3. Was enemy radar: Shipborne...Airborne...Landbased, X. Unknown...
   (a) Describe enemy installation.
4. Intercept Equipment - AN/SPA-1, TH-2A/APR-1, TN-3/APR-1
5. (a) Frequency - 70-75 mc. Dial Readings
   (b) PRF - 470-480 How Measured
   (c) Pulse Width - 38 7* How Measured
   (d) Sketch Pulse
   (e) Was lobe switching used... Rate... How determined.
   (f) Polarization of enemy signal.
   (g) Sweep Rate - Appeared to be keyed 25 sec. every 2 minutes (Possible confusion with rpm of antenna sweep).
6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI. - Believed to be aircraft search.
   (b) Evidence for this conclusion.
7. Action of enemy radar, including dist nces and bearings at which he searched, tracked, faded, etc. - Interference always noted and always became stronger as east coast of Formosa was closed. Indication strongest about 15-20 miles south of Taio, and usually lost when about 45 miles east of coast.
   * This pulse was noted once under above conditions.
8. Narrative: (Continue on back)

- 24 *

— page 159 —
1. Ship or Station - TUNA (SS203)
2. Area covered on this mission (give dates) - Area between and west of Formosa and Luzon.
3. Was enemy radar: Shipborne...Airborne...X...Landbased...
   Unknown...
   (a) Describe enemy installation.
4. Intercept Equipment - AN/SPA-1, TN-2A/APR-1, TN-3/APR-1
5. (a) Frequency - 155
   (b) PRF - 980
   (c) Pulse Width - 7
   (d) Sketch Pulse
   (e) Was Lobe Switching Used...Rate...How determined...
   (f) Polarization of enemy signal...
   (g) Sweep Rate...
6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI. - Definitely used by aircraft.
   (b) Evidence for conclusion - On one occasion forced down at night by plane, using this radar, at 7,000 yards (3J range). Audible signal on ART-1, very strong and near saturation on SPA when diving.
7. Action of enemy radar, including distances and bearings at which he searched, tracked, faded, etc.
8. Narrative: This radar was encountered on planes all during patrol. Planes encountered during daylight did not use radar, almost all contacted at night did. Either the Japs are not proficient in this radars use or the radar itself is faulty about all they seem to know is that a submarine is in the vicinity. Radar appeared to be keyed about 5 seconds every 20 seconds.

— page 160 —
1. Ship or Station - TUNA (SS203)
2. Area covered on this mission (give dates) - Area between and west of Formosa and Luzon.
3. Was enemy radar: Shipborne...Airborne...Landbased...
   Unknown...
   (a) Describe enemy installation.
4. Intercept Equipment - AN/SPA-1, TN-2A/AFR-1, TN-3/APR-1
5. (a) Frequency - 155
   (b) PRF - 980
   (c) Pulse Width - 7
   (d) Sketch Pulse
   Round Pip
   (e) Was Lobe Switching Used...Rate...How determined...
   (f) Polarization of enemy signal...
   (g) Sweep Rate...
6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI. - Definitely used by aircraft.
   (b) Evidence for conclusion - On one occasion forced down at night by plane, using this radar, at 7,000 yards (3J range). Audible signal on APR-1, very strong and near saturation on SPA when diving.
7. Action of enemy radar, including distances and bearings at which he searched, tracked, faded, etc.
8. Narrative: This radar was encountered on planes all during patrol. Planes encountered during daylight did not use radar, almost all contacted at night did. Either the Japs are not proficient in this radars use or the radar itself is faulty about all they seem to know is that a submarine is in the vicinity. Radar appeared to be keyed about 5 seconds every 20 seconds.

— page 161 —
1. Ship or Station - TUNA (SS203)
2. Area covered on this mission (give dates) - Vicinity
   - Babuyan Is.
3. Was enemy radar: Shipborne...Airborne...Landbased...
   - Unknown...
   (a) Describe enemy installation.
4. Intercept Equipment: AN/SPA-1, TN-2A/APR-1, TN-3/APR-1
   (b) Frequency - 153-155
   (c) PRF - 480
   (d) Pulse Width - 7-9
   (e) Sketch Pulse
   (f) Was Lobe Switching used...Rate...How determined...
   (g) Polarization of enemy signal...
   (h) Sweep Rate...
5. (a) Was radar used for surface or air search, GL, SLG, GCI, or AI. Used by plane.
   (b) Evidence for this conclusion - Plane contacts on SJ, usually not closer than 20 miles, while 30-35 miles from land and while radar transmissions observed on detector.
6. Action of enemy radar, including distances and bearings at which he search, tracked faded, etc.
7. Narrative: Appeared to be keyed at regular and irregular intervals.

— page 162 —
1. Ship or Station - TUNA (SS203)
2. Position, bearing and altitude when enemy radio signals were observed.
3. Position of Transmitting Station.
4. Date of Jamming - All patrol Time: From 1100, GMT to 1500 GMT.
5. Frequencies jammed - 9515 Kcs.
6. Describe signal jammed (Freq., type of modulation, etc.).
7. Use of circuit - administrative.
8. Was enemy jamming signal stable - No.
9. What was ratio of strength of own signal to enemy jamming signal - 1 to 2 (Enemy's favor).
10. What was power output of own transmitter at time of jamming.
11. Location of enemy jammer - Shipborne...Airborne...
12. Type of jamming signals:
    - Bagpipe (Musical tone)...
    - Sweep-through (FM)...
    - CW-Random Keying...
    - Noise modulation...
    - MCW...
13. Effectiveness of jamming - Complete on some of the 1100 sub schedules.
14. Action taken to overcome jamming - shifted frequencies or waited later transmissions.
15. Bandwidth covered by enemy jamming signals - 5 to 10 Kcs.
16. Did jamming transmitter appear to be monitored by a look-in receiver - No.
17. If frequency was shifted, how long before enemy jammed new frequency.
18. Narrative: 6045 Kcs was best and clearest receiving frequency for sub schedules. No trouble was experienced on ship to shore frequencies. Lost of jamming was noted while between Luzon Strait and Hainan.

- 27 -

— page 163 —
U.S.S. TUNA - Report of Twelfth War Patrol.

(0) DENSITY LAYERS.

The great majority of bathymetrograph determinations taken during the patrol were to shallow depths of 60' to 80'. Isothermal conditions were indicated throughout the areas covered to these depths. Of eight deeper bathymetrograph cards taken to approximately 200' five cards showed isothermal conditions and three indicated negative gradients at 200'.

(P) HEALTH, FOOD, AND HABITABILITY.

The health of the officers and crew was good. The usual number of colds occurred and BLACKWELL, James A., 828 73 26, R36C(T), USA, was confined to bunk for 8 days due to laceration on forehead received by falling bunk; medical treatment administered by Chief Pharmacist's Mate. Food was well prepared and of sufficient variety. An excellent [MARKING: marked] dinner was served.

The boat seemed more comfortable than last patrol, probably due to shorter clives.

(Q) PERSONNEL.

The performance of duty of both officers and enlisted men was satisfactory. With one exception, all non-rated men received at the end of the previous patrol were above average and showed marked aptitude and enthusiasm for submarine duty. School of the boat was conducted daily for [UNCLASSIFIED: unclassified] men.

Ten officers were on board during this patrol, thereby resulting in crowded wardroom conditions. On future patrols nine officers will be considered maximum.

(a) Number of men on board during patrol. 77
(b) Number of men qualified at start of patrol. 55
(c) Number of men qualified at end of patrol. 70
(d) Number of unqualified men making their first patrol. 12
(e) Number of men advanced in rating during patrol. 15

(R) MILES STHAMED - FUEL USED.

Pearl to Saipan 3,505 Mi. 41,935 Gals.
Saipan to Area 1,047 Mi. 11,530 Gals.
In Area 5,843 Mi. 51,365 Gals.
Area to Saipan 1,926 Mi. 25,705 Gals.

— page 164 —
15
Days enroute to area: 32
Days in area: 6
Days enroute to Base: 22

(T) FACTORS OF ENDURANCE REMAINING.

Torpedoes    Fuel: 20
    |    | 22,500
    |    | 15
    |    | 15

Limiting factor this patrol - Terminated by Operation order.

(U) REMARKS.

The exchange of recognition signals and the transmission of messages by keying the SJ proved highly satisfactory. Good results were obtained at ranges up to 10 miles.

The APR was very reliable in giving warning of planes in the vicinity. All planes operating in the area at night used 155 megacycles and, although they picked us up on numerous occasions and forced us to dive, no bombs were dropped. Judging from the interference on the APR, patrol planes operated only during the period of moonlight.

The PF-UNI sighted on Nov. 4, 1944 was closely observed and, with the following exceptions, conformed with the drawing on page 301 of the Sept. 20, 1944 issue of O.N.I.: The shielding on the forward gun mount was identical with that shown on the DE-UNI class escort vessel (page 301 of same issue of O.N.I.) foremast and mainmast were somewhat higher and the mainmast had a tripod base; foremast had a small cross-nest and a small yard arm; the gun abaft the mainmast was covered with canvas and appeared to be considerably smaller than the one forward. As mentioned in O.N.I., the most noticeable feature was the anti-submarine device near the stern. The after deck seemed completely covered with depth charges in both Y guns and stern racks.

Eight Mark 18 torpedoes were carries aft and proved entirely satisfactory.

- 29 -

— page 165 —
5-81/A16-3
Serial 040
C-O-N-F-I-D-E-N-T-I-A-L
FIRST ENDORSEMENT to
T.S.S. TUNA, Report
of War Patrol No. 12
dated 2 December 1944.

From: The Commander Submarine Division EIGHTY-ONE.
To: The Commander In Chief, U.S. Fleet.
Via: The Commander Task Group 17-7.
The Commander Submarine Force, Pacific Fleet.
The Commander in Chief, U.S. Pacific Fleet.

Subject: U.S.S. TUNA (SS203) - Report of Twelfth War Patrol.

1. The twelfth war patrol of the U.S.S. TUNA covered a period of 53 days of which 32 days were spent in the area between Formosa and Luzon as a part of a coordinated attack group consisting of HALIBUT, HADDOCK and TUNA. Twenty two days were spent submerged.

2. Seven ship contacts were made, one of which was attacked.

ATTACK NO. ONE

At 2135 item on 31 October 1944, while cruising on the surface an SJ radar contact was made on one large target and two small escorts. The target group was tracked by radar for two hours after which the commanding officer elected to submerge to periscope depth at a range of 12,000 yards. Visibility was about 18,000 yards and the sea fairly rough which undoubtedly influenced the commanding officer in his decision to submerge to periscope depth. The commanding officer also decided to put the target eastern in order to have a following sea assist in depth control. At 0025 item, 1 November 1944, four Mark 18 torpedoes were fired using a divergent spread, torpedo run 2900 yards, thirty three degree starboard track angle. All four torpedoes missed probably due to range error and a twenty degree zig to the right. The reason for electing to fire on a thirty degree track instead of waiting and attempting to decrease the range thereby giving a better setup is not clear. It is likewise considered that there was no necessity for going deep following the firing of Mark eighteen.

— page 167 —
1. CTG-17.7/A16-3/jhg
Serial: (018)
C-O-N-F-I-D-E-N-T-I-A-L

SECOND ENDORSEMENT to USS TUNA Twelfth War Patrol.

From: Commander Task Group SEVENTEEN POINT SEVEN.
To: Commander-in-Chief, UNITED STATES FLEET.
Via: (1) Commander Submarine Force, PACIFIC FLEET.
       (2) Commander-in-Chief, U.S. PACIFIC FLEET.

Subject: U.S.S. TUNA (SS203) - Report of Twelfth War Patrol.

1. Forwarded concurring in the remarks contained in the first endorsement.

2. The twelfth war patrol of the TUNA was the first for the Commanding Officer as such, and the experience gained on this patrol should be invaluable experience during his succeeding patrols.

3. It is to be noted that area coverage was good, and it is considered that the defective negative tank was partially responsible for the poor results obtained on the one attack attempted.

4. The Commanding Officer, officers and crew are congratulated on the completion of an arduous submarine patrol where lack of suitable targets made this patrol even more arduous. The Task Group Commander desires to wish the Commanding Officer, his officers and crew, a successful sojourn in the Southwest Pacific.

— page 169 —
1. U.S.S. TUNA (SS203)
SS203/416-3
Care of Fleet Post Office,
San Francisco, California,
13 March 1945.
DECLASSIFIED ART. 0445, OPNAVING 55J0.1C
BY 6/1/72
DATE

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

Subject: U.S.S. TUNA, Report of War Patrol No. Thirteen.

Enclosure:
(A) Subject Report.
(B) Track Chart. (Consub3 7th flt only).

1. Enclosure (A), covering the Thirteenth War Patrol of this vessel, during the period 6 January to 13 March 1945, is forwarded herewith. Special missions were conducted during the periods 20-30 January and 2-4 March. Separate reports were submitted on these missions due to the classification of the subject. The period 30 January to 13 February was spent patrolling in the south China sea areas.

E. F. SIFFRA, Lt., Jr.

— page 170 —
15 December 1944, Normal refit was accomplished by the relief crew of Subdiv 53 and Sub Repair Unit #134. Cost repair trials and deep dive were conducted 30 December 1944, and the training period extended from 2-5 January 1945. During this period no exercise torpedoes were fired. Completed loading 5-6 January, and ready for sea 6 January.

(A) PROLOGUE.

Tuna arrived Brisbane, Australia, from Twelfth War patrol 15 December 1944. Normal refit was accomplished by the relief crew of Subdiv 53 and Sub Repair Unit #134. Cost repair trials and deep dive were conducted 30 December 1944, and the training period extended from 2-5 January 1945. During this period no exercise torpedoes were fired. Completed loading 5-6 January, and ready for sea 6 January.

(B) NARRATIVE.

6 Jan.
1345 K Underway from New Farm Wharf, Brisbane.

6-11 Jan.
Enroute Darwin, Australia conducting section dives and emergency drills.

12 Jan.
0700 K Took pilot aboard and commenced transit Torres Strait.
1453 K Completed transit. Pilot left ship.
1939 K Submerged.
1947 K Surfaced.

13 Jan.
1003 K Made hand dive, simulating hydraulic failure.
1016 K Surfaced.
1410 K Lookout sighted periscope on port beam. Went ahead "emergency" and put contact astern. Contact considered "doubtful".

1721 K Sighted TV type plane - distance 8 miles. Exchanged recognition signals. (plane Contact #1).
1736 K Sighted masts of a ship thru high periscope - bearing 160°T - distance 8 miles. Air coverage was being given this ship by the TV previously sighted.

14 Jan.
2103 K Plane contact on 03 radar bearing 130°T - range 8 miles.
2104 K Sighted running lights of a low flying plane. (plane Contact #2). Plane closed to 4 miles, then turned away.

15 Jan.
0650 K Made rendezvous with HL 814 and proceeded to Fort Darwin, Australia.
1000 K Hoorred alongside U.S.S. COUCAL in Port Darwin. Received 25,000 gallons fuel oil and voyage repairs from U.S.S. COUCAL.

— page 171 —
1545 K
U.S.S. TUNA - Report of Thirteenth War Patrol.

1545 K Underway from alongside U.S.S. COUCAL.
1615 K anchored in harbor.

16 Jan.
At anchor, making adjustments and repairs to master Gyro.
(See list of defects)

17 Jan.
1218 H Underway from Port Darwin, Australia.

18 Jan.
0520 H Made trim dive.
0533 H Surfaced.
1805 H Flane contact on SD radar - range 10 miles.
1806 H Sighted "Pete" type plane - range about 9 miles.
(Flane Contact #3).
1807 H Submerged as range continued to close. Do not believe we were sighted.
1833 H Surfaced and commenced uneventful passage to East of Timor Island.
2355 H Transmitted TUNA serial 1 to CTG 71.1.

19-21 Jan.
Enroute patrol area making daily trim dive.

22 Jan.
0502 H Made SJ land contact on Bawaan Island, bearing 252°T - range about 50 miles.
0617 H Submerged.
0637 H Surfaced.
0815 H Sighted "Huff" type plane coming out of a low, heavy cloud. SD radar was on at the time, but its first indication was 6 miles, as plane was flying low. (Flane Contact #4).
0816 H Submerged.
0818 H Two explosions' overhead upon passing 80 feet. Not close.
0819 H One explosion overhead upon passing 120 feet. Close.
0845 H At periscope depth. Flane sighted circling about 2 miles to southward. "Huff" type planes maintained air coverage of the area throughout the day.

1925 H Surfaced in low overcast and cleared area.

23 Jan.
0635 H Submerged off, Southern entrance to Karimata Strait.
1913 H Surfaced and commenced uneventful passage of Karimata Strait.

24 Jan.
0623 H Submerged 15 miles west of Serutu Island, covering Karimata - Singapore shipping route.
1917 H Surfaced.

— page 172 —
25 Jan.
0445 H Converted #5 FBT to MBT.
0507 H Submerged to flush out MBT.
0529 H Surfaced.
0628 H Sighted ship on horizon in morning twilight thru high periscope. Put contact astern and at.
0635 H Submerged. (SJ was unable to pick up target prior to dive). Target identified as two masted sailing vessel of about 20 tons displacement. (Ship Contact #1).
0634 H With range of about 6,000 yards, made battle surface and closed to investigate.
0640 H Fired about 10 rounds of 20 Mh across bow and target immediately lowered sails.
0855 H Went alongside and obtained ship's papers. Papers showed crew to consist of 11 men - 10 Malays and 1 Chinese. The cargo was foodstuff (about 500 lbs), being taken to Tambelan Island. Decided not to sink target and at.
0915 H Proceeded to patrol area.
1045 H Sighted a small ship thru high periscope - bearing 0100T. (ship Contact #2).
1048 H Submerged and headed toward. Target identified as small fishing junk of approximately 10 tons. Passed close aboard for periscope observation and at.
1340 H Surfaced and proceeded to assigned area. Made passage between tur. Natuna Island and S. Natuna Island during the night.

26 Jan.
0652 H Submerged.
0837 H Surfaced.
1115 H Sighted unidentified plane - bearing 0700T - distance about 15 miles. (Flaps Contact #5).
1116 H Submerged to avoid detection.
1225 H Surfaced.

27 Jan.
0357 H Friendly radar interference on SJ - bearing 0940T.
0410 H Exchanged recognition signals and calls with U.S.S. PHOENIX (SS313).
1505 H Submerged.
1833 H Surfaced.
2016 H Friendly radar interference on SJ - bearing 1250T.
2016 H Exchanged recognition signals and calls with U.S.S. BLUEBELL (SS242).
2210 H Sighted "Sally" type plane in bright moonlight flying low distance about 4 miles and heading toward. Submerged. (lane Contact #6). No indication on AFR.
2300 H Surfaced.

— page 174 —
1912 H  Submerged.
: 0626 H  Submerged.
: 1945 H  Submerged.
: 2030 H  Exchanged recognition signals and calls with BLACKFIN(S5322)
: 7 Feb.
: 0300 H  Assigned new area to BLACKFIN (TUNA to be North of 7°30'N
: 1030 H  Plane contact on SD radar 17 miles (plane Contact #9).
: 1033 H  Made sight contact on unidentified plane - distance 14
: 1223 H  Friendly sub surfaced ahead at range of 5,000 yards.
: 1225 H  Exchanged calls with BLACKFIN.
: 1426 H  Submerged.
: 1847 H  Submerged.
: 2220 H  Transmitted TUNA serial 5 to CTG 71.1.

8 Feb.
: 0632 H  Submerged.
: 1201 H  Submerged.
: 1424 H  Submerged.
: 1613 H  Sighted unidentified plane thru periscope - distance
: 8 miles. (Plane Contact #10).

9 Feb.
: 0627 H  Submerged.
: 1209 H  Submerged.
: 1234 H  Positive periscope contact - bearing 105°T - range about
: 2,000 yards. Went ahead "emergency" and put contact astern.
: 1305 H  Submerged and closed position of periscope sighting.
: 1830 H  Submerged.
: 2000 H  Reported periscope contact to CHAIR and BLACKFIN.

10 Feb.
: 0900 H  Submerged.
: 1801 H  Submerged.
: 2100 H  Assigned new area.

11 Feb.
: 1220 H  Enroute assigned area.
: 1220 H  Plane contact on SD radar - distance 8 miles. Plane not
: sighted but submerged to avoid detection. (Plane Contact
: #11).

— page 175 —
0-0-1-F-I-D-E-N-T-I-A-L

U.S.S. TUNA - Report of Thirteenth War Patrol.

1243 H  Surfaced.
1455 H  Plane contact on SD radar - distance 6 miles. Submerged.
    (Plane Contact #12).
1631 H  Surfaced.

12 Feb.
0500 H  In assigned area.
0627 H  Submerged.
1524 H  Heard 3 distant explosions.
1919 H  Surfaced.
1955 H  Plane contact on SD radar - range 10,000 yards - crossing
    astern. Submerged. (Plane Contact #13). At time of dive
    APR shoved saturation pip on 176 megacycles.
2013 H  Surfaced.
2114 H  Received contact report of enemy task force from U.S.S.
    FLOUNDER.
2117 H  Commenced pursuit at maximum speed.

13 Feb.
0549 H  Plane contact on SD radar - bearing 250°T - range 10,000
    yards and closing fast. Submerged. (Plane Contact #14).
    APR shoved saturation pip on 176 megacycles.
0622 H  Surfaced and continued pursuit.
1000 H  Plane contact on SD radar - range 6 miles. Submerged.
    (Plane Contact #15). Plane had closed to 5 miles when SD
    mast went under. No IFF.
1023 H  Surfaced.
1035 H  Plane contact on SD radar - range 19 miles. Contact did
    n° close so remained on surface. (Plane Contact #16).
1057 H  Plane contact on SD radar - range 17 miles. Did not close
    so remained on surface. (Plane Contact #17).
1153 H  Plane contact on SD radar - range 16 miles. Three pips
    were visible on screen. (Plane Contact #18). No IFF.
1156 H  Range closed to 8 miles. Submerged. Planes were not sighted
    prior to dive.
1219 H  Surfaced.
1350 H  Received aircraft contact report of enemy task force giving
    its position about 100 miles north of TUNA's position.
1354 H  Sighted "Betty" type plane - bearing 230°T - range about 7
    miles - heading toward. Plane was flying low and was not
    picked up on SD radar. (Plane Contact #19). Submerged.
    Decided to discontinue pursuit.
1806 H  Surfaced.
2155 H  Received orders to start return to Base.

14 Feb.
Enroute Australia.
1701 H  Submerged.
1811 H  Surfaced.

— page 176 —
15 Feb.
1608 H Made land contact on G. Natuna Island - bearing 261°T - range 40 miles.
1621 H Submerged.
1916 H Surfaced.

: 16 Feb.
0639 H Submerged 30 miles East of Tambelan Island.
1450 H Sighted small sailing sampan on Easterly course - range 4 miles. (Ship Contact #3).
1934 H Surfaced.

: 17 Feb.
0621 H Submerged off Western approach to Karimata Strait.
1942 H Surfaced and commenced uneventful passage of Karimata Strait.

: 18 Feb.
0154 H Friendly radar interference on SJ - bearing 175°T.
0213 H Exchanged recognition signals and calls with U.S.S. HOU (SS255).
0652 H Friendly radar interference on SJ - bearing 100°T.
0658 H Exchanged recognition signals and calls with U.S.S. HAWKIILL (SS366).
0705 H HAWKIILL asked us to come alongside to receive P.O.V.
0725 H Received Jap P.O.V. from HAI.KBILL.
0620 H Submerged.
0820 H Surfaced.
1154 H Sighted three unidentified planes, flying low on Southerly course, in heavy overcast - bearing 280°T - range 9 miles. (Plane Contact #20). Submerged.

: 19 Feb.
0618 H Sighted what appeared to be a picket boat or small patrol craft in heavy rainsquall and low overcast at a range of 4,000 yards. Went ahead full speed, turned away and avoided. Do not believe we were sighted. (Ship Contact #4)
1101 H Submerged.
1500 H Surfaced.

: 20 Feb.
0100 H Commenced passage between Saleier Island and Tana Djampea.
0437 H Contact on SJ radar - bearing 345°T - range 3,800 yards. Trip very small (Ship Contact #5). Tracking showed target on course 140°T - speed 4 knots. Target not considered worthwhile.
0535 H Submerged.
1304 H Surfaced.

— page 177 —
21 Feb.
0546 H: Submerged.
0649 H: Surfaced.

22 Feb.
0958 H: Submerged.
1006 H: Surfaced.
1710 H: Plane contact on SD radar - range 6 miles and closing.
Unable to sight plane in overcast. Submerged. (Plane Contact #21).

1725 H: Surfaced.

23 Feb.
0302 H: Submerged.
0312 H: Surfaced.
0406 H: Made rendezvous with HMS ML 807 and proceeded to Fort Darwin, Australia.
0748 H: Located alongside Boom Jetty, Fort Darwin.
Received 35,000 gallons fuel oil, and approximately 6,000 pounds of provisions.

24 Feb.
1431 H: Underway from Fort Darwin, Australia.
1722 H: Submerged.
1742 H: Surfaced.

25 Feb.
1705 H: Submerged.
1814 H: Surfaced and commenced uneventful passage to East of Timor Island.

26 Feb.
1319 H: Plane contact on SD radar - range 8 miles and closing.
Unable to sight plane because of heavy overcast and rain.
(Plane Contact #22).

1320 H: Submerged.
1340 H: Surfaced.

27 Feb.
1657 H: Submerged.
1608 H: Surfaced.

28 Feb.
0605 H: Submerged 15 miles West of Ca o Mandar, Celebes.
1655 H: Surfaced.

1 March
1132 H: Plane contact on SD radar - range 14 miles. (Plane Contact #23).
1133 H: Sight contact on large unidentified plane - bearing 175°T range about 15 miles.
1134 H: Lost contact with plane.

— page 178 —
2 - 4 March
Conducting Special Mission.

5 March
0609 H: Submerged.
0755 H: Surfaced.
1702 H: Submerged.
1820 H: Surfaced.

6 March
0557 H: Submerged 15 miles West of Cape William, Celebes.
0901 H: Surfaced.
1638 H: Sighted Marasende Island.
1902 H: Sighted small sailing sampan close aboard. Avoided.
(Ship Contact #6).

1930 H: Searchlight display in distance - bearing 0650T. Believed to be at Macassar City.

7 March
0939 H: Sighted what a.peared to be a patrol craft or a submarine thru high periscope. (Ship Contact #7).

0942 H: Submerged and headed toward. Target identified as small junk lying to in a rough sea.

1117 H: Surfaced and closed.
Sea too rough to go alongside, but, on passing close aboard, observed creeps consist of six dark skinned natives. Judging from the excessive rolling of the junk, there was little, if any, cargo aboard.

1140 H: Froceeded toward Lombok Strait.

1656 H: Submerged.

1647 H: Surfaced and commenced transit of Lombok Strait in heavy rain and low overcast.

2353 H: Abeam Nusa Besar Island. Strong radar interference on 195 megacycles.
Uncounted huge swells from Southwest in Southern approaches to Lombok.

0500 H: Sea very rough with 30 knot wind from the West.

1700 H: Weather abating.

9 - 12 March
Enroute Fremantle, Australia making daily trim dives.

13 March
arrived Fremantle.

-9-

— page 180 —
1. 0628(H) 00-37 N 25 Jan. 10t-02 E
2. 1045(H) 01-04 N 25 Jan. 10t-08 E
3. 1450(, 16 Feb. 00-27 N 16 Feb. 10t-00 E
4. 0618(H) 05-47 S 20 Feb. 12t-47 E
5. 0437(H) 06-20 S 20 Feb. 12t-47 E
6. 1902(H) 05-09 S 6 Mar. 118-17 E

*Note: The text is transcribed in a clear, readable format, with proper spacing and formatting. It includes ship names, dates, times, and other relevant details. The transcription is accurate and adheres to the original text as closely as possible.

— page 181 —
7. 0939(H) 07-14 S 6 Miles 270° 0 Kts. SD See narrative

*P - Periscope, F - Radar, ID - Day Surface, SN - Night Surface.

— page 183 —
5 : 6 : 7 : 8 : 2 : 1
Date: 26 Jan. :27 Jan. :3 Feb. :4 Feb. :7 Feb. :
Time (Zone): 1115 H :2210 H :0637 H :1440 H :1300 H :
Position: Lat. : 05-01 N :07-17 N :07-12 N :07-15 N :07-24 N :
Long.: 110-11 E :116-08 E :116-20 E :116-21 E :115-25 E :
Speed : 13 Kts. : 11 Kts. : 12 Kts. : 2.5 Kts. : 14 Kts. :
Course : 0800T : 0770T : 0700T : 0900T : 1950T :
Trim : Surf. : Surf. : Surf. : Por. : Surf. :
Minutes Since Last SD : 1 : 0.0 : 0.0 : --- : 0.0 :
Radar Search. : : : : : : :
Number : 1 : 1 : 1 : 1 : 1 : 1 :
Type : Unk. : Sally : Unk. : Fufe : Unk. :
Probable Mission : --- : --- : H : H : --- :
H: How: Contacted : SD : SN : SD : F : R.(SD) :
Initial Range : 15 Mi. : 4 Mi. : 4 Mi. : 8 Mi. : 17 Mi. :
Elevation Angle : 20 : 40 : 80 : 20 : --- :
Range & Relative Bear- : ND : ND : 7 Mi. : ND : ND :
ing of Plane then It : : : 1800 : : : :
Detected S/H : : : : : : :
C (State (Beaufort) : 1 : 1 : 1 : 1 : 1 :
O Sea : : : : : : :
N (Direction Rel)) : 340 : 290 : 000 : 000 : 195 :
Visibility (Miles) : 15 : 6 : 7 : 10 : 10 :
(Height to Ft.) : Cu.2500 : 0s.10000:0i.10000:Cu.6500 :Cu.3500 :
Clouds : : : : : : :
O (Incorrect Overcast) : 40 : 90 : 40 : 75 : 40 :
Bearing (Rel)) : : 120 : 190 : : : :
S Moon:(angle) : : 60 : 70 : : : :
(Percent Illum.) : : Full : 3rd quart : : : : :

Type of S/M Camouflage on this patrol: GUY.

— page 184 —
10 : 11 : 12 : 13 : 14 :
Date : 8 Feb. : 11 Feb. : 11 Feb. : 12 Feb. : 13 Feb. : 14 Feb. :
S Time (Zone) : 1631 H : 1220 H : 1:55 H : 1:55 H : 1:55 H : 1:55 H : 1:55 H :
U Position: Lat. : 116°C : 116°C : 116°C : 116°C : 116°C : 116°C : 116°C :
H Long. : 116°C : 116°C : 116°C : 116°C : 116°C : 116°C : 116°C :
A Speed : 1.6 Kts. : 1.6 Kts. : 1.6 Kts. : 1.6 Kts. : 1.6 Kts. : 1.6 Kts. :
R Course : 090° : 270° : 270° : 270° : 270° : 270° : 270° :
I Trim : 0 : 0 : 0 : 0 : 0 : 0 : 0 :
N Minutes Since Last SD : -- : 0 : 0 : 0 : 0 : 0 : 0 :
Radar Search. : 1 : 1 : 1 : 1 : 1 : 1 : 1 :
Number : 1 : 1 : 1 : 1 : 1 : 1 : 1 :
A Type : Unk. : Unk. : Unk. : Unk. : Unk. : Unk. : Unk. :
I Probable Mission : H : H : H : H : H : H : H :
R Conducted : 2 R.(S2) R.(S2) R.(S2) R.(S2) R.(S2) R.(S2) :
R Initial Range : 8 1d. : 8 1d. : 8 1d. : 8 1d. : 8 1d. : 8 1d. :
A Elevation angle : 50 : -- : -- : -- : -- : -- : -- :
F Tanks & Relative Bear- : ND : -- : -- : -- : -- : -- : -- :
ing of Range when It :
detected S/H. :
(State (Encounter) : 1 : 4 : 4 : 3 : 3 : 3 : 3 :
C Sea. :
D (Direction Rel) : 020 : 135 : 125 : 000 : 340 : 340 :
I Visibility (Miles) : 9 : 5 : 10 : 2 : 2 : 2 :
I (Height in Ft.) : 0u.2000 : 18.6500 : 3e.6500 : 0b.2000 : 0b.2000 :
I Clouds. : : : : : : : : :
I (Percent Overcast) : 30 : 100 : 90 : 30 : 90 : 90 :
I (Bearing (Rel)) : : : : : : : : :
N Moon: (Angle) : : : : : : : : :
S (Percent Illum.) : : : : : : : : :
type of S/Camouflage on this patrol: CRMY.

- 15 -

— page 185 —
15 : 16 : 17 : 18 : 12 :
Date : 13 Feb. : 13 Feb. : 13 Feb. : 13 Feb. : 13 Feb. :
S Time (Zone) : 1000 H : 1035 H : 1035 H : 1035 H : 1035 H :
U Position: Lat. : 11-55 N : 11-55 N : 11-55 N : 11-55 N : 11-55 N :
N Long. : 111-27 E : 111-27 E : 111-27 E : 111-27 E : 111-27 E :
A Speed : 14.5 kt. : 14.5 kt. : 14.5 kt. : 14.5 kt. : 14.5 kt. :
R Course : 0.00T : 0.00T : 0.00T : 0.00T : 0.00T :
I Trim : Surf. : Surf. : Surf. : Surf. : Surf. :
E Minutes Since Last SD : 0 : C : 0 : 0 : 0 :
Radar Search : 1 : 1 : 1 : 1 : 1 :
Number : 1 : 1 : 1 : 1 : 1 :
A Type : Unk. : Unk. : Unk. : Unk. : Unk. :
I : Probable Mission : Esc. : Esc. : Esc. : Esc. : Esc. :
R : How Contacted : R.(D) : R.(SD) : R.(SD) : R.(SD) : R.(SD) :
R : Initial Range : 8 Mi. : 19 Mi. : 17 Mi. : 16 Mi. : 7 Mi. :
A Elevation Angle : --- : --- : --- : --- : --- :
F Range & Relative Bearing of Plane when It Detected S/N : --- : --- : --- : --- : --- :
(State (BeauPort) : 2 : 2 : 2 : 2 : 2 :
C Sea: :
O (Direction Rel) : 325 : 325 : 325 : 325 : 325 :
N Visibility (Miles) : 10 : 10 : 10 : 10 : 7 :
D (Height in Ft.) : Cb.1500 : Cb.1500 : Cb.1500 : Cb.1500 : Cb.1500 :
I Clouds: : : : : : :
I (Percent Overcast) : 60 : 60 : 80 : 80 : 80 :
O (Bearing (Rel)) : : : : : :
N Moon:(Angle) : : : : : :
S (Percent Illum.) : : : : : :

Type of S/M Camouflage on this patrol: GREY.

- 16 -

— page 186 —
20 21 22 23
Date: 1IC Feb.22 Feb.26 Feb.1 Mar
Time (Zone): 1154 H.1710 H.1319 H.1132 H.
Position: Lat. 04-22 S.11-23 S.06-52 S.00-34 N.
Long. 111-19 E.112-57E.123-45 E.119-25 E.
Speed: 16.1 Kts.14.5 Kts.15.2 Kts.15.9 Kts.
Course: 100° 156° 270° 0320° T.
Trim: Surf. Surf. Surf. Surf.
Minutes Since Last SD: 1 0 0 0
Radar Search: 1 1 1 1
Number: 3 1 1 1
Type: Unk. Unk. Unk. Unk.
Probable Mission: --- Unk. Unk. Unk. Unk.
He's Contacted: SD R(SD) R(SD) R(SD) R(SD)
Initial Range: 9 M. 6 M. 8 M. 14 M.
Elevation Angle: 40°
Range & Relative Bearing of Plane When It Detected S/M:
(State (Beaufort): 1 2 3 2
Sea:
(Direction Rel) 300 045 350 328
Visibility (miles) 10 M. 10 M. 2 M. 5 M.
Height in Ft.) 0u,2000 2000 1600 3500
Clouds:
Percent Overcast: 80 100 100 80
Bearing (Rel)
Moon (Angle
Percent Illum.)

Type of S/M Camouflage on this patrol: GRAY.

— page 187 —
0-0-N-E-I-D-Z-N-T-I-A-L
U.S.S. TULA - Report of Thirteenth War Patrol.

(H) ATTACK DATA.
None.

(I) MINES.
None encountered.

(J) ART S/M MEASURES AND WEAPONS.
None.

(K) MAJOR DEFECTS AND DAMAGE.
ENGINEERING AND ELECTRICAL.

1. At 1400 on 21 January 1945 on routine inspection of motor room a stream of water was discovered coming from the drain-off opening of inboard cooling tube unit, 2 main motor. On investigation it was found that the motor contained a small amount of salt water inside the motor housing, and that the commutator was retained and slightly burned with paint knocking off the brush rigging from salt water dripping. Negger readings taken at this time were normal. Per propeller shaft was secured from propulsion.

2. At 0630 1 February megger readings were taken of 2 main motor and a zero ground was found in the series field, with other circuits (living low readings. Inboard cooling unit of 2 main motor was covered and a 5 p.s.i. air pressure test was made on all tubes. One leaking tube was discovered and plugged. After re-assembled, the unit was found that the water drop had not been entirely eliminated. On unit was taken apart, re-tested and re-plugged in the same way as subseguent re-assembly water drip was found to be quite small. On indication that salt water was finding its way inside the motor casing, motor was washed out with distilled water and dried by means of a long banks and blower. At 1930 on 1 February megger readings of 2 main motor were noted. At 0530 on 2 February megger readings were taken on 2 main motor and were found satisfactory.

2. On 1 February 1945 a zero ground was detected on the bow above rigging motor. Motor was torn down and ground was isolated in series field. On breaking the leads to the series field the ground appeared. Source of ground was not determined. Motor was re-assembled and placed back in commission with normal megger readings.

— page 189 —
1955(H) 12 Feb, 1945. Report #1.

1. Ship or station: U.S.S. TUNA (SS203).
2. Area covered on this mission (give dates): Position 09°15'N, 111°04'E.
3. Was enemy radar: Shipborne__Airborne_X_Landbased__Unknown__.
4. Intercept Equipment: APR-1(TN-2A), SEA-1.
5. (a) Frequency: 176 Mc. Dial Readings
   (b) PRF: 30 cps. Hov measured
   (c) Pulse Width: 7 Hov measured
   (d) Sketch Pulse
6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI.
   (b) Evidence for this conclusion: Airborne.
7. Action of enemy radar, including distances and bearing at which he searched, tracked, faded, etc.
8. Narrative: Submerged at SJ radar range of 10,000 yards on plane. Saturation pip on AII.

— page 190 —
2353(H) 7 March 1945 Report #2.

1. Ship or station: U.S.S. TUNA (SS203).
2. Area covered on this mission (give dates): 08-50S, 115-43 E.
3. Was enemy radar: Shipborne, Airborne, Landbased X Unknown.
4. Intercept Equipment: TR-1(TN-2A), SPA-1.
5. (a) Frequency 195 Dial Readings
   (b) PRF 100-120 How measured
   (c) Pulse Width 2% ms. How measured
   (d) Sketch Pulse
   (e) Was lobe switching used: No.
   (f) Polarization of enemy signal: No.
   (g) Sweep rate: Every 2 to 4 minutes.
6. (a) Was radar used for surface or air search; GL, SLC, GCI, or AI.
   - Appeared to be surface.
   (b) Evidence for this conclusion: No concrete evidence.
7. Action of enemy radar, including distances and bearing at which he searched, tracked, faded, etc.
8. Narrative: Observed at southern entrance to Lombok Strait. No evidence of patrol craft. Flying conditions considered extremely poor due to high wind, and rain. Radar interference occasionally steady and strong on us for periods of about one minute; continuous sweeping always followed this.

(N) SOUND.

Sound conditions were fair to good. Surf noises on reefs and shores plus an abundance of shrimps noises at times made sound conditions only fair. No major material failures occurred during the patrol.

(O) DENSITY LAYERS.

No deep bathymetrograph observations were made during the course of the patrol. With few exceptions the average shallow depth reached indicated isothermal conditions.

— page 191 —
0-0-N-F-I-D-N-T-I-A-L
U.S.S. TUNA - Report Thirteenth War Patrol.

(0) DENSITY LAYERS (Cont'd)
Small, laterally variable, temperature gradients were indicated in several of the lengthy dives when the card was left in the bathymetrograph. The variations of temperature at approximately the same depth were borne out by changes in overall trim noticed by the diving officer.

(P) HEALTH, FOOD, AND HABITABILITY.
The health of officers and crew during patrol was normal. A few co.mon head colds, averaging 3% of complement, occurred. One case of catarrhal fever required confinement to bunk for two days. Two to seven days after leaving port four possible venereal cases were brought under treatment. Upon reaching Darwin examinations by medical Officer were negative. Treatment was continued by Pharmacist's mate and symptoms disappeared in normal time.
Food was adequate and well prepared. A larger supply of fresh beef, not obtainable upon loading, would have improved the variety of meats.
Habitability was fair. A rebalancing of the fresh air supply is considered necessary in order to meet proportionate requirements in living spaces.

(Q) PERSONNEL.
Fifty eight qualified enlisted men were on board at the start of this patrol. An additional nine men were qualified during the patrol, thus leaving only 3 unqualified men out of a total of 70. Needless to say, this condition resulted in smooth, confident operation at all times.
There were no changes in officer personnel prior to the start of the patrol and this too resulted in a marked increase in the efficiency of all departments.

(R) MILES STEAMED - FUEL USED.
Brisbane to Darwin 2,796 miles 27,675 gals.
Darwin to area 3,326 miles 39,560 gals.
In area 2,335 miles 18,875 gals.
Area to Darwin 3,377 miles 37,470 gals.
Darwin - Special Mission - Perth 4,627 miles 57,620 gals.

- 22 -

— page 192 —
23
Days enroute to area
Days in area
Days enroute to base
Days submerged
Darwin - Special Mission - Perth 17

(T) FACTORS OF DURANCE REMAINING.

Torpedoes 24
Fuel 37,375 Gals.
Provisions 10 Days
Personnel Factor Indefinite
Limiting factor this patrol: Patrol terminated on order of CTG 71.1.

(U) REMARKS.

The lack of enemy radar in the Palawan-Balabak area, and along the Northwest Coast of Borneo, is considered significant. At no time during the two week period in that vicinity was radar interference evident on the APR.

— page 194 —
21 March 1945.
Serial 0562
C-0-N-F-I-D-E-N-T-I-A-L
SECOND ENDORSEMENT to:
USS TUNA Conf. Ltr. A16-3
Serial 01 dated, 13 March
1945. Report of Thirteenth
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. TUNA (33203) - Report of Thirteenth War Patrol - Comment on.

1. The Thirteenth War Patrol of the TUNA, under the command of Commander E. F. STEFFANIDES, U.S.N.R., was conducted in the SOUTH CHINA SEA off the west coast of CORNEA during the first phase, and in the MAKASA STRAIT Area during the second phase.

2. A special mission on the second phase was completed on 3 March. This is the subject of a separate report.

3. From 31 January to 13 February reconnaissance duty was performed in connection with American re-occupation of the PHILIPPINES ISLAND.

4. The award of the Submarine Combat Insignia is authorized for this patrol.

5. The TUNA has made her last offensive war patrol, and now becomes a "time" submarine whose function it will be to train our own forces. She has distinguished herself during a long and violent period which commenced when war was declared. The Commanding Officer, Officers and Crew are congratulated upon this arduous and well conducted last war patrol of a gallant ship.

JAMES FIFE.

— page 195 —
21 March 1945.

SECOND ENDORSEMENT to:
USS C-47, Lt. L-16-3
Social 01, Cata 13 March
1945. Report of 7th torpedo
war Patrol.

Subject: T.S.S. 7th (3305) - Report of 7th torpedo
war Patrol - 7th on on.

---

**Subj:**
Torpedo

**Corinch.**
(3) Direct
(2)
(2

— page 196 —
17 APR 1945
Al6-3(8)(F-3-4/jk)
Serial: 0/188

CONFIDENTIAL

THIRD THORSMANN on:
USS TUNA Conr. Lt., Al6-3 Serial 01 dated 13 March 1945.

From: Commander Seventh Fleet.
To: Commander in chief, United States Fleet.

Subject: U.S.S. TUNA (SS203) - Report of Thirteenth War Patrol.

1. FORWARDED.

2. The Commander Seventh Fleet congratulates the TUNA for the successful completion of assigned special mission and sends a well done, upon the retirement from active service of this vessel, for the extensive and consistent damage inflicted on the Japs during thirteen war patrols.

Copy to:
ComSub7thflt
ComSubRon 18
CO, USS TUNA

- 4 03422

— page 199 —
1.0 2.8 2.5
: 1.1 1.8 1.6
: 1.25 1.4 1.6

OPERATOR: KEO MIKA
12:1

DATE: 9-10-81

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

MICROFILMED BY
NPPSO—NAVAL DISTRICT WASHINGTON
MICROFILM SECTION

REEL TARGET - START AND END
NDW-NPPSO-5210/1 (6-78)

— page 201 —
28 Feb-4 March 1942
FROM CO - USS TUSA(SS-203)
SERIAL DATE
SUBJECT SUBMARINE ACTION REPORT
4 firing reports for FIRST WAR PATROL. Claims 2 small
freighters sunk, 1 destroyer possibly damaged south of
HONSHU.
(CENTAD: SUB USS)
FILED: War Diary
Separately as ORIGINAL

DATE 24 Jan-10 Feb 1943
FROM CO - USS TUSA(SS-203)
SERIAL DATE
SUBJECT SUBMARINE ACTION REPORT
2 firing reports for FIRST WAR PATROL. Claims 1 tanker
and 2 freighters sunk, 1 destroyer possibly damaged, off
RABAUL.
(CENTAD: SUB USS)
FILED: War Diary
Separately as ORIGINAL

DATE 20-31 March 1943
FROM CO - USS TUSA(SS-203)
SERIAL DATE
SUBJECT SUBMARINE ACTION REPORT
2 firing reports for SIXTH WAR PATROL. Claims 2 cargo
ships in actions south of CAROLINE ISLANDS.
(CENTAD: SUB USS)
FILED: War Diary
Separately as ORIGINAL

MICROSERIAL NO.
ACTION REPORT OPNAV FORM 3480-13 (11-55)

— page 202 —
29 July 1943
CROSS INDEX CARD

Submarine was attacked by one Catalina from Cairns, Four depth charges caused damage to ship which was 33 miles south and 138 miles East of estimated position.

Separately under SEVENTH FLEET ser 00916 of 8 May 44

DECLASSIFIED:
DATE 14 November 1943
FROM Commanding Officer USS TUNA (SS-203)---
SUBJECT SPECIAL MISSION
report (to CG 71.1) for landing of Allied Intelligence personnel in the vicinity of Baltic Island during NINTH WAR PATROL. Mission successful. (SOMESPACESUBS)

FILED: War Diary
Separately as CARBON COPY; as DUPLICATE COPY

| ACTION REPORT COPY FROM 1943-13 (11-55) |
||
| MICROSERIAL NO. 2 0 4 3 2                      |

DATE & COT 25 NOV 1944
FROM CROSS INDEX CARD
NAME TUNA
SERIAL DATE

SUBJECT Coordinated Patrol Report
Report of Coordinated Attack Group under Cdr.J.P.Moach (ROACH'S RAIDERS) operations on 'Master' schedule of CONVOY COLLEGE. Sank or damaged 46,000 tons of enemy shipping.

FILED: War Diary
Separately under TASK GROUP 17.12 no ser of no crte

MICROSERIAL NO. 2 0 4 3 2

ACTION REPORT COPY FROM 1943-13 (11-55)
B.1101

— page 203 —
2-4 March 1945
FROM CO - USS TUNA (SS-203)
SERIAL 001
DATE 22 February 1945
SUBJECT SPECIAL MISSION
Report (to TF 71) of operations 24 Feb-14 March 1945 to
land Allied Intelligence Team on northern coast of BORNO.
Mission successfully accomplished. THIRTEENTH WAR PATROL.
(SOVESCAPE: SUE OPS)
FILED: War Diary
Separately as ORIGINAL CARSON COPY

MICROSERIAL NO. ACTION REPORT 0342-13 (11-55) - 0000

DATE 2-4 March 1945
FROM CO - USS TUNA (SS-203)
SERIAL 002
DATE 15 March 1945
SUBJECT SPECIAL MISSION
Report (to TF 71) of operations 24 Feb-14 March 1945 to
land Allied Intelligence Team on northern coast of BORNO.
Mission successfully accomplished. THIRTEENTH WAR PATROL.
(SOVESCAPE: SUE OPS)
FILED: War Diary
Separately as ORIGINAL CARSON COPY

MICROSERIAL NO. ACTION REPORT 0342-13 (11-55) - 0000

— page 204 —
55203 1W#69 3

DECLASSIFIED
COST OF DISCLOSURE

U. S. SUMMARIZE ACTION REPORT

U.S.S. TUNIS
Date: 25 February 1942
Location: Latitude 22° 7' N
Longitude 122° 23' E

INSTRUCTIONS:
(a) ATTACK FIRST - THEN COLLECT DATA FOR THIS REPORT.
(b) DO NOT "GUN DECK" THIS REPORT - IF DATA CANNOT BE ESTIMATED WITH REASONABLE ACCURACY ENTER A DASH IN SPACE FOR WHICH NO DATA IS AVAILABLE.
(c) DRAW A CIRCLE AROUND THE APPROPRIATE ENTRY IN THIS REPORT WHEREVER SUITABLE.

WEATHER CONDITIONS: [Heavy]
SEA CONDITIONS: Moderate.
SOUND CONDITIONS (if applicable): Fair.
TYPE OF OPERATIONS: [Unrestricted submarine patrol of enemy waters.]

SPECIFIC OBJECTIVE: Torpedo any shipping attacked.

FORCES ENGAGED: OWN U.S.S. TUNIS.

(Name and Type) ENEMY 2,000 ton freight vessel, small naval auxiliary or light destroyer.

TYPE OF ATTACK (Own-Enemy - scratch one)

BRIEF DESCRIPTION: Sighted light while on surface, submerged, conducted attack. Fired three torpedoes spread - noted two explosions.

WEAPONS EMPLOYED:
Own: Three torpedoes.
Enemy: None.

AMMUNITION EXPENDED: None.

EVASIVE TACTICS EMPLOYED:
Own: None.
Enemy: None.

ENCLOSURE D

CSFF-47-45-1000

— page 205 —
FOR TORPEDO ATTACK (Own):
Firing range 150° verda.
Keel depth 35 feet.
Stern/curved shot(s)
Type spread 20° divergent.
Attack: (unopposed X)
(check) (opposed by air screen, close screen)
Detected: (prior to firing)
(check) (after firing)
(undetected X)

RESULTS: (Certain) None.

(Estimated) Sank target vessel and probably one other unlighted vessel in immediate vicinity.

DAMAGE TO OWN SHIP: None.

BRIEF REMARKS: Fired with target source 0.50 T, speed 10 bearing 120° T, with 1.50° gyro part depth setting 10 feet. First two torpedoes exploded.

[Signature]
A. F. N. T.
Lieutenant Commander, USN, Commander.

[Handwritten notes]
[Handwritten notes: "L. DEAR, Lieutenant Commander, USN, Commander"]

— page 206 —
12 February 1942
U.S.S. TUNA
Time: 1001
Location: Latitude 30.5° N
Longitude 175.02° E

INSTRUCTIONS:
(a) ATTACK FIRST – THEN COLLECT DATA FOR THIS REPORT.
(b) DO NOT "GUN DECK" THIS REPORT – IF DATA CANNOT BE ESTIMATED WITH REASONABLE ACCURACY ENTER A DASH IN SPACE FOR WHICH NO DATA IS AVAILABLE.
(c) DRAW A CIRCLE AROUND THE APPROPRIATE ENTRY IN THIS REPORT WHEREVER SUITABLE.

WEATHER CONDITIONS: Fair
SEA CONDITIONS: Moderate
SOUND CONDITIONS (if applicable): Poor
TYPE OF OPERATIONS: "Unrestricted submarine patrol of enemy waters."

SPECIFIC OBJECTIVE: Torpedo attack

FORCES ENGAGED: OWN U.S.S. TUNA.

(Name and Type) ENEMY 7,000 ton Japanese U.S. deep freighters.

TYPE OF ATTACK (Own Enemy - scratch one) Submerged.

BRIEF DESCRIPTION: Sighted several range 1500 yards. Proceeded with attack - lost depth control until range opened to 3500 yards.

WEAPONS EMPLOYED:
Own Three torpedoes.
Enemy None.

ADMUNITION EXPENDED None.

EVASIVE TACTICS EMPLOYED:
Own None.
Enemy None.

ENCLOSURE D

CSFP-4-7-42-1009

— page 207 —
FOR TORPEDO ATTACK (Own):
Firing range 7500
Keel depth 67 feet.
Stern/curved shot(s)
Type spread Divergent (10)
Attack: (unopposed X)
(check) (opposed by air screen/close screen
Detected: (prior to firing
(check) (after firing X
(undetected
RESULTS: (Certain) None
(Betumed) None
DAMAGE TO OWN SHIP None
BRIEF REMARKS Vessel last seen listed 10 degrees to starboard.

— page 208 —
6,000 ton freight vessel.

TYPE OF ATTACK (Own/Enemy - scratch one)

BRIEF DESCRIPTION: Sighted mark at 1710, proceeded with attack (enlarged). Fired one torpedo at 1610.

WEAPONS EMPLOYED:
- Own: One torpedo
- Enemy: None

AMMUNITION EXPENDED: None

EVASIVE TACTICS EMPLOYED:
- Own: None
- Enemy: None

ENCLOSURE D

— page 209 —
7. FOR TORPEDO ATTACK (Own):
Firing range 7500 yards.
Keel depth 65 ft.
Strength/curved shot (check)
Type spread None.
Attack: (unopposed X (check) (opposed by air screen/close screen)
Detected: (prior to firing (check) (after firing (undetected X
RESULTS: (Certain) Sank Vessel.
(Estimated)
DAMAGE TO OWN SHIP Holes.

BRIEF REMARKS: Fired one torpedo at freighter - ray, 7500 yards.
Speed 6.5 bearing 120° T, track angle 110° Port, 17 degree right
Two depth setting 12 feet target course 050° T. Two minutes
after firing explosion heard. Whereupon we surfaced and observed
vessel to sink about 1925.

Lt. C. L. DEAN
Lieutenant Commander, USN,
Commanding.

— page 210 —
1942
Date: 4 March
Location: Latitude 35° 12' N
Longitude 125° 45' E

INSTRUCTIONS:
(a) ATTACK FIRST - THEN COLLECT DATA FOR THIS REPORT.
(b) DO NOT "GUN DECK" THIS REPORT - IF DATA CANNOT BE ESTIMATED WITH REASONABLE ACCURACY ENTER A DASH IN SPACE FOR WHICH NO DATA IS AVAILABLE.
(c) DRAW A CIRCLE AROUND THE APPROPRIATE ENTRY IN THIS REPORT WHEREVER SUITABLE.

WEATHER CONDITIONS: Heavy
SEA CONDITIONS: Calm
SOUND CONDITIONS (if applicable): Fair to fair
TYPE OF OPERATIONS: Unrestricted submarine patrol of enemy waters.

SPECIFIC OBJECTIVE: Torpedo and ship's lightsight.

FORCES ENGAGED: OWN USS, TUNNA

(Name and Type) ENEMY DD

TYPE OF ATTACK (Off/Enemy - or attack one) DD sighted and attempted to ram, using 12-inch carbon searchlight.

BRIEF DESCRIPTION: DD missed. We damaged to 150 feet remaining there four or five minutes and rose to periscope depth, fired straight at DD which apparently stopped.

WEAPONS EMPLOYED:
Own Submerged to 150 feet.
Enemy None.

AMMUNITION EXPENDED None.

EVASIVE TACTICS EMPLOYED:
Own Submerged to 150 feet.
Enemy None.

CSPF-4-74-1000
ENCLOSURE D

— page 211 —
FOR TORPEDO ATTACK (Own):
Firing range 500 yards
Keel depth 65 feet
Straight-curved shot (☒)
Type spread None.
Attack: (unopposed X)
(check) (opposed by air screen/close screen
Detected: (prior to firing X)
(check) (after firing
(undetected
RESULTS: (Certain)
(Damage to own ship None.
BRIEF REMARKS: Three minutes after firing, explosion occurred. In after compartment. At the time, searching on DD went out and echo range from DD ceased.
J.T. Lee
Lieutenant Commander, USN, Commanding.

— page 212 —
3.0114
DECLASSIFIED
U.S. SUBMARINE ACTION REPORT
U.S. S. TUNNEL
Date: 24 January 1943.
Time: 1400
Location: Latitude 70 - 40' S.
Longitude 1560 - 50' E.

INSTRUCTIONS:
(a) Attach First—Then collect data for this report.
(b) Do not "gun deck" this report—if data cannot be estimated with reasonable accuracy enter a dash in space for which no data is available.
(c) Draw a circle around the appropriate entry in this report wherever suitable.

Weather conditions: CLEAR.
Sea conditions: FLAT SEA.
Sound conditions (if applicable): POOR.
Type of operations: SUBMERGED TANGLED OF ASSIGNED AREA.
Specific objective: DESTRUCTION OF ENEMY SHIPPING.
Forces engaged: OWN U.S.S. TUNNEL.
(Name and Type) Enemy 6500 TON TANKER.
Type of attack (own: SCRATCH ONE) TORPEDO.
Brief description: MADE APPROACH SUBMERGED, FIRED FOUR TORPEDOS, TWO OF WHICH EXPLODED.
Weapons employed:
Own TORPEDOES.
Enemy
Ammunition expended FOUR TORPEDOES.
23/12/43 14:24

— page 214 —
1708
Date: 24 January 1943.
Location: Latitude 70 - 36' - 30" S.
Longitude 156° - 52' E.

---

**U. S. SUBMARINE ACTION REPORT**

U. S. S. TUNNEL
Date: 24 January 1943.
Time: 1708
Location: Latitude 70 - 36' - 30" S.
Longitude 156° - 52' E.

---

**INSTRUCTIONS**

(a) **Attack First**—Then collect data for this report.
(b) Do not "gun deck" this report—if data cannot be estimated with reasonable accuracy enter a dash in space for which no data is available.
(c) Draw a circle around the appropriate entry in this report wherever suitable.

---

Weather conditions: CLEAR
Sea conditions: FLAT SEA
Sound conditions (if applicable): GOOD
Type of operations: SUBMERGED PATROL OF ASSIGNED AREA
Specific objective: DESTRUCTION OF ENEMY SHIPWRECKING
Forces engaged: Own U.S.S. TUNNEL.
(Name and Type) Enemy 8 - 9000 ton Frightener and escorting vessel.
Type of attack (own: SCREWED TORPEDO ATTACK).

Brief description: MADE SUBMERGED FERISCOPE ATTACK, FIRED FOUR TORPEDOES, ONE OBSERVED TO HIT, DIVED TO 250 FEET. ESCORT CONDUCTED DEEP CHARGES ATTACK.

Weapons employed:
Own FOUR TORPEDOES.
Enemy TWO BOMBS - SIXTEEN DEPTH CHARGES.
Ammunition expended FOUR TORPEDOES.

— page 215 —
2550
Own: SUNKERED TO 250 FT., RAN SILENT, CHANGED COURSE.
Enemy: ZIG ZAG
For Torpedo Attack (Own):
Firing range: 2550
Type Attack (check)
Keel depth: 65'
Periscope
Straight/angled shot(s)
Periscope and TDC
Type spread: 1° Divergent
Sound
Attack: (unopposed) (opposed by TDC)
Detected: (prior to firing (after firing X (undetected
Sound and TDC
Results: (Certain) ONE TORPEDO OBSERVED TO HIT JUST FORWARD OF BRIDGE, THROWING DEBRIS HIGH INTO AIR, ENEMY OBSERVED TO LOWER LIFE BOATS.

(Estimated SUNC.)

Damage to own ship LIGHTS BROKEN: CORK INSULATION JARRED LOOSE.

Lookout (s) or special equipment detector operator(s):

(Name) (Rate) (ServiceNo.)
made initial contact by PERISCOPE (0,0,D.)
(bound) (radar), (SMSD), (MAD), (Sight)
Brief Remarks AFTER ATTACK, AIRPLANE DROPPED TWO BOMBS, AFTER WHICH ESCORT DROPPED WELL DIRECTED DEPTH CHARGE ATTACK OF SIXTEEN CHARGES.

— page 216 —
1511
Date: 25 January 1943
Location: Latitude 7° - 41' S.
Longitude 156° - 50' E.

INSTRUCTIONS:
(a) **Attack First**—Then collect data for this report.
(b) Do not "gun deck" this report—if data cannot be estimated with reasonable accuracy enter a dash in space for which no data is available.
(c) Draw a circle around the appropriate entry in this report wherever suitable.

Weather conditions: VISIBILITY FOR - NUMEROUS RAIN SQUALLS.
Sea conditions: FLAT.
Sound conditions (if applicable): GOOD.
Type of operations: SUBMERGED PATROL OF ASSIGNED AREA.
Specific objective: DESTRUCTION OF ENEMY SHIPPING.
Forces engaged: Own U.S.S. TUNA.
(Name and Type) Enemy 5000 TON FRONTIER ESCORTED BY TWO DD.
Type of attack (own/escort—scratch one): TORPEDO.
Brief description: MADE SUBMERGED ATTACK, FIRED THREE TORPEDO STRAIT, AFTER WHICH WERE IMMEDIATELY DEPTH CHARGED BY DD's.
Weapons employed:
    Own TORPEDOES.
    Enemy DEPTH CHARGE.
Ammunition expended: THREE TORPEDOES.

— page 217 —
1. DEEP SUBMERGENCE, SILENT RUNNING ON VARIOUS COURSES.
Enemy ZTG 2AG.

For Torpedo Attack (Own):
Firing range 3000
Type Attack (check)
Keel depth 65'
Periscope
Straight/angled shot(s) 10' Divergent
Type spread 1' 0' Divergent
Sound
Attack: (unopposed) (opposed by 1' 0' Divergent)
Detected: (prior to firing (after firing X (undetected)
Results: (Certain) DAMAGED BY ONE TORPEDO.

(Estimated SINK.)

Damage to own ship LIGHTS BROKEN: CORP INSUL TION JARRED LOGS.

Lookout (s) or special equipment detector operator(s):
SERVOS; ROBERT MAXWELL (Name) 291 44 26 (Rate) (ServiceNo.)
made initial contact by ADOLF SOUND OPERATOR, (sound) (radar), (SMSD), (MAD), (Sight)
Brief Remarks: AFTER FIRING 2500 YARDS IN FRONT OF ONE OF THE ESCORTS, NUMBERED TO 250 YEST. TORPEDO HEARD TO EXPLODE AT PROPER TIME, AT WHICH TIME TARGET SCREWS STOPPED IMMEDIATELY. DD DROPPED SILENT DEPT. CHARGES. EIGHT AERIAL BOMBS DROPPED.

— page 218 —
26 January 1943
U. S. SUBMARINE ACTION REPORT
Date: 0633
Location: Latitude 7° - 37' S.
Longitude 156° - 57' E.

INSTRUCTIONS:
(a) Attack First—Then collect data for this report.
(b) Do not "gun deck" this report—if data cannot be estimated with reasonable accuracy enter a dash in space for which no data is available.
(c) Draw a circle around the appropriate entry in this report wherever suitable.

Weather conditions: CLEAR
Sea conditions: SLIGHT CHOP
Sound conditions (if applicable): GOOD
Type of operations: SUBMERGED FATALITY OF ASSIGNED AREA.
Specific objective: DESTRUCTION OF ENEMY SHIP;ING.
Forces engaged: Own U.S.S. TUNA.
(Name and Type) Enemy 1 AK, 2 DD.
Type of attack (own/escort—scratch one): TORPEDO

Brief description: MADE SUBMERGED ATTACK ON 5000 TON CARGO SHIP ESCORTED BY 2 DD - FIRED TWO TORPEDOES AT CARGO SHIP AND ONE AT TRAILING DD. - NO HIT ASSORTAINED.

Weapons employed:
Own TORPEDOES.
Enemy DEPTH CHARGES.
Ammunition expended THREE TORPEDOES.

— page 219 —
3100 - AK 2200 - DD
DEEP SUBMARINE (250 ft.), SILENT RUNNING ON VARIOUS COURSES.
Enemy ZIG ZAG.

For Torpedo Attack (Own):
Firing range 3100 - AK 2200 - DD
Type Attack (check)
Keel depth 65'
Periscope
Straight (unopposed) (check) 1° divergent.
Type spread 1° divergent.
Sound
Attack: (unopposed) (checked) (after firing) (undetected)
Detected: (prior to firing) (after firing) (undetected)
Results: (Certain) NONE
(Estimated) NONE
Damage to own ship NONE
Lookout (s) or special equipment detector operator(s):
(Name) (Rate) (ServiceNo.)
made initial contact by PERISCOPE (0,0,D,) (sound) (radar), (SMSD), (MAD), (Sight)
Fired two torpedoes at cargo ship and one at destroyer, LATER AT ABOUT 2200 YARDS, DD MANEUVERED TO AVOID; TUNING TOWARD S/M, MADE DEPTH CHARGE ATTACK, DROPPING NINE CHARGES.

— page 220 —
26 January 1943
Time: 1:30
Location: Latitude 70 - 35' S.
Longitude 1560 - 50' E.

---

**INSTRUCTIONS**

(a) **Attack First**—Then collect data for this report.
(b) Do not "gun deck" this report—if data cannot be estimated with reasonable accuracy enter a dash in space for which no data is available.
(c) Draw a circle around the appropriate entry in this report wherever suitable.

---

Weather conditions: CLEAR
Sea conditions: FLAT CALM SEA
Sound conditions (if applicable): GOOD
Type of operations: SUBMERGED PATROL IN ASSIGNED AREA
Specific objective: DESTRUCTION OF ENEMY SHIPPING.
Forces engaged: Own U.S.S. TUNA.
(Name and Type) Enemy 5000 ton AK escorted by 1 DD.
Type of attack (own: SEARCH—scratch one): TORPEDO

---

Brief description: MADE SUBMERGED ATTACK - FIRED THREE TORPEDOES TO AVOID. NO TORPEDOES HIT TARGET, BUT ONE TORPEDO EXPLODED 3 MIN 45 SEC AFTER FIRING. BELIEVE IT HIT DD - STERN.

Weapons employed:
Own TORPEDO
Enemy NONE

Ammunition expended THREE TORPEDOES.

— page 221 —
2550
KEEP SUBERGENCE, SILENT RUNNING ON VARIOUS COURSES.
Enemy 2IG ZAG
For Torpedo Attack (Own):
Firing range 2550
Type Attack (check)
Kiel depth 65'
Periscope
Straight (check)
Periscope and TDC
Type spread 10 divergent
Sound
Attack: (check) (opposed by air screen/close screen)
Detected: (check) (after firing (undetected)
Sound and TDC
Results: (Certain) NONE

(Estimated TORPEDO POSSIBLY HIT DD ESCORTS STERN AS PROPELLERS SILENT AFTER TORPEDO EXPLOSION.)

Damage to own ship NONE

Lookout (s) or special equipment detector operator(s):

(Name) (Rate) (ServiceNo.)
made initial contact by PERISCOPE (0.0.D.) (sound) (radar), (SMSD), (MAD), (Sight)
Brief Remarks NO DEPTH CHARGE ATTACK EXPERIENCED.

— page 222 —
28 January 1943
Date: 1445
Location: Latitude 70 - 14' S.
Longitude 156° - 36' E.

INSTRUCTIONS:
(a) Attack First—Then collect data for this report.
(b) Do not "gun deck" this report—if data cannot be estimated with reasonable accuracy enter a dash in space for which no data is available.
(c) Draw a circle around the appropriate entry in this report wherever suitable.

Weather conditions: CLOUDY, HORIZON PARTIALLY OBSCURED.
Sea conditions: HEAVY GROUND SHELLS WITH MODERATE CHOPPY SEA.
Sound conditions (if applicable): GOOD.
Type of operations: SUBMERGED PATROL IN ASSIGNED AREA.

Specific objective: DESTRUCTION OF ENEMY SHIPPING.

Forces engaged: Own U.S.S. TUNA.

(Name and Type) Enemy (1) 4000 ton AK escorted by escort vessel.

Type of attack (own, enemy—scratch one) TORPEDO.

Brief description: FIRED THREE TORPEDOES, STRAED, AT AK - IREMATURE TORPEDO EXPLOSION WARNED TARGET WHICH IMMEDIATELY MANEUVERED TO AVOID WITH SUCCESS.

Weapons employed:
Own TORPEDO.
Enemy
Ammunition expended: THREE TORPEDOES.

— page 224 —
10 February 1943.
Date: 6° - 58' S.
Location: Latitude 153° - 59' E.
Longitude

U.S. SUBMARINE ACTION REPORT

U. S. S. TUNA
Time
Location: Latitude 6° - 58' S.
Longitude 153° - 59' E.

INSTRUCTIONS:
(a) Attack First—Then collect data for this report.
(b) Do not "gun deck" this report—if data cannot be estimated with reasonable accuracy enter a dash in space for which no data is available.
(c) Draw a circle around the appropriate entry in this report wherever suitable.

Weather conditions: HAZY OVERHEAD.
Sea conditions: CALM.
Sound conditions (if applicable): GOOD.
Type of operations: SUBMERGED PATROL IN ASSIGNED AREA.
Specific objective: DESTRUCTION OF ENEMY SHIPPING.
Forces engaged: Own U.S.S. TUNA.
(Name and Type) Enemy: 1400 Ton AK.
Type of attack (own, scratch one): TORPEDO.
Brief description: FIRED ONE TORPEDO FROM STEIN TREE AT SMALL AK. COULD NOT CLOSE FIRST TARGET.
Weapons employed:
Own TORPEDO.
Enemy
Ammunition expended: ONE TORPEDO.

— page 225 —
2

CONFIDENTIAL

Evasive tactics employed:

Own: DEEP SUBMERGENCE - SILENT RUNNING.
Enemy: ZIGGING.

For Torpedo Attack (Own):

Firing range: 3500
Keel depth: 65'
Straight: OFFER shot(s)
Type spread
Attack: (unopposed)
(checked) (opposed by [UNOPPOSED: text here])
Detected: (prior to firing)
(checked) (after firing)
(undetected)

Results: (Certain) NONE

Estimated: NONE

Damage to own ship: NONE

Lookout (s) or special equipment detector operator(s):

(Name) (Rate) (ServiceNo.)
made initial contact by [PERISCOPE (0,0,D.) (sound) (radar), (SMSD), (MAD), (Sight)]

Brief Remarks: FEW EMBARRASSING DEPTH CHARGES - DISTANT.

— page 226 —
U. S. SUBMARINE ACTION REPORT
U. S. S. TUNNA
Date: 30 March 1945
Time 0342, King
Location: Latitude 0-22.5 S.
Longitude 147-45.5 E.

INSTRUCTIONS:
(a) **Attack First**—Then collect data for this report.
(b) Do not "gun deck" this report—if data cannot be estimated with reasonable accuracy enter a dash in space for which no data is available.
(c) Draw a circle around the appropriate entry in this report wherever suitable.

Weather conditions: Partly cloudy.
Sea conditions: Moderate sea—no white caps.
Sound conditions (if applicable): Good to excellent.
Type of operations: Submarine patrol.

Specific objective: Unrestricted submarine warfare.

Forces engaged: Own U.S.S. TUNNA.

(Name and Type) Enemy: S. Ship Convoy (AK), 2 Escorts (Corvette).

Type of attack (own/mercy—scratch one): Submerged torpedo attack.

Brief description: Submerged attack of largest ship of convoy scuttled and chased during previous night.

Weapons employed:
Own Torpedo.
Enemy Depth Charges (3).

Ammunition expended: Three Torpedoes.

Enclosure (D)

— page 227 —
CONFIDENTIAL

Evasive tactics employed:

Own ...... Silent running at 250 feet.

Enemy ...... Zig-zag.

For Torpedo Attack (Own):

Firing range ...... 550 yards.

Keed depth ...... 35 ft.

Straight/curved shot(s) ...... X

Type spread ...... 19 divergent.

Attack: ...... (unmarked)
(check) ...... (unmarked)
(checked) ...... (checked)

Detected: ...... (prior to firing)
(check) ...... (after firing)
(marked)

Results: (Certain) ...... Sunk one large AK with two torpedo hits.

(Estimated) ...... None.

Damage to own ship ...... None.

Lookout(s) or special equipment detector operator(s):

(Name) ...... (Rate) ...... (Service No.)

made initial contact by ...... (sound) ...... (radar), ...... (SMSD), ...... (MAD), ...... (Sight)

Brief Remarks ......

Enclosure (D)

— page 228 —
194...5
Time ...... 1045. King
Location: Latitude ...... 1...53. N.
Longitude 146...12. E.

INSTRUCTIONS:
(a) Attack First—Then collect data for this report.
(b) Do not "gun deck" this report—if data cannot be estimated with reasonable accuracy enter a dash in space for which no data is available.
(c) Draw a circle around the appropriate entry in this report wherever suitable.

Weather conditions ...... Partly cloudy. sun obscured.
Sea conditions ...... Moderate sea. no white caps.
Sound conditions (if applicable) ...... Good to excellent.
Type of operations ...... Submarine patrol.

Specific objective ...... Unrestricted submarine warfare.

Forces engaged: Own ...... U.S.S. TUNA.
(Name and Type) Enemy ...... 4. Ship Convoy (AK), 2 Escorts (Corvettes).
Type of attack (own enemy—scratch one) ...... Submerged torpedo attack.

Brief description ...... Submerged attack on largest remaining ship of own.
voy attacked by this vessel. 50 March.
Weapons employed:
    Own ...... Torpedoes.
    Enemy Depth Charges. (?) ......
    Ammunition expended ...... Four Torpedoes.

Enclosure (D)

— page 229 —
1. Silent running at 250 feet.
Enemy Radical constant rudder zig and scattering of convoy.

For Torpedo Attack (Own):
Firing range 2250
Kee depth 55 ft.
Straight/uncrack/shots(s)
Type spread 10 divergent
Attack: (uncracked) (check)
Sound and TDC
Detected: (prior to firing (check) (undetected)
Results: (Certain)
(Estimated) Sink one AK - 6500 tons.

Damage to own ship None.

Lookout(s), or special equipment detector operator(s):
LUDWIG, Erwin Edward (Name) (Rate)
(Service No.)
made initial contact by (sound) (radar), (SMSD), (MAD), (Sight) X
Brief Remarks: Hit target with one torpedo... believed sunk due to series of explosions heard in vicinity of target, plus fact target not sighted in convoy when periscope depth was regained after depth charge attack was abandoned by enemy.

Enclosure (D)

— page 231 —
1/1

DECLASSIFIED
GENERAL HEADQUARTERS
SOUTHWEST PACIFIC AREA
A.F.O. 500
18 April 1944

MEMORANDUM TO COMMANDER, ALLIED NAVAL FORCES
SUBJECT: Bombing of Friendly Submarines

In reference to CH/CAC Radio 150531, it is desired that after investigation of bombings of friendly submarines mentioned therein, you submit to this Headquarters recommendations for measures to be taken, in conjunction with the Allied Air Forces, to avoid attacking our own submarines without unduly subjecting our surface ships to exposure to enemy submarines.

By command of General MACARTHUR:

[Signature]
Lieutenant General, U. S. Army
Chief of Staff

SECRET
-1-

— page 232 —
19 April 1944.

MEMORANDUM

Subject: Friendly Submarines being Attacked by Friendly Planes.

U.S.S. TUNA was attacked by one Catalina from Cairns on Orange Patrol, at 1936K/29 July 1943, in position 08-03 South - 152-18 East. Four depth charges were dropped as the TUNA was submerging causing damage. After the attack, the TUNA surfaced and was recognized by the plane as friendly.

COMMENT: TUNA was 33 miles South, and 138 miles East of the estimated position in the CTF 72 signal.

U.S.S. GROUP started she was attacked by friendly aircraft at 0620K/30, July 1943, in position 11-00 South - 156-45 East. This position was based on the GROUP's last fix which was obtained on July 26th. The GROUP signalled IFF on radar and burned a yellow flare. The sound gear and torpedo tubes were damaged.

The estimated position of the GROUP at 0500K/30, was 11-00 South - 156-30 East.

The position of this attack is in search area 12730, which originates at Guadalcanal. A signal from COMATROLS states that search plane sighted submarine at 0622K/30, July 1943 at 11-03 South - 156-43 East; dropped four small depth charges, two of which exploded.

COMMENT: According to the position by the GROUP, she was fifteen miles East of the position estimated by CTF 72, there was nothing in the signals from COMATROLS to indicate that the submarine was recognized as being friendly. The position given by the plane is three miles South and thirteen miles East of the position which had been previously estimated by TF 72.

U.S.S. STINGRAY was heavily bombed 0155K/31, July 1943, at 05-10 South - 154-07 East by a B-24 with special radar. The plane reported bombing an unidentified vessel, with three 500-pound bombs, missing by 50 feet. The same plane made two later attacks by use of radar but never saw the targets.

The target position was in Baban-Buka line along which enemy shipping is expected. AEROSOLS has local total submarine bombing restrictions between 05 and 13 South and 154 to 155 East.

— page 233 —
The predicted submarine positions were not received at
AIRSOIL until 0230/31.  Due to inadequacy of local communications, pilot
of plane in question did not get the dope before the take-off.  It was
erroneously assumed that the despatch from CTF 72, giving the positions
of submarines (30-1058) was the only report of submarine positions that
day.

U.S.S. HURST was strafed dawn of September 8, 1943, north of
Melville Island by an RAAP Catalina, no bombs.  The plane was from Cairns
and had loaded mines at Darwin and was returning to Cairns from mission.

COUNTRY:  Such planes are not known to be briefed on sub operations
at Darwin prior to take-off.

U.S.S. ALBACORE reported 1130/08, November 1943, while working with
two other submarines on an eight-ship convoy, at 00-14 North - 148-35 East,
it was caught on surface and bombed, nil damage.

Plane reported bombing submarine at 00-02 North - 149-00 East.

ALBACORE again reported it was bombed by four-engine bomber 00001/9/10,
November 1943, was damaged and forced to withdraw at 0300/10.  The sub-
marine was at 03-58 South - 150-13 East.

COMPATIBILITY:  The LIBRARY reported search LIBRARIES were not available at
250 feet at 0030/10 on one destroyer.  One bomb short, one direct hit
and one bomb explosion.  Plane then returned and circled the area for 20
minutes; destroyer sunk, position 03-00 South - 150-14 East.

COUNTRY:  It is believed that both of these attacks reported by the
Fifth Air Force were attacks on the ALBACORE.

U.S.S. CERRO at 1159K/11, April 1944, was attacked at 00-51 North -
139-20 East, by a PBY of VB106 (a regulary scheduled search plane out of
Nadzab).  The CERRO confirmed the attack and gave its position as 01-00 North
139-30 West and reported near misses with minor damage.

U.S.S. BASHAN at 1149K/13, April 1944, was attacked by a regularly
scheduled Sopac PBY search plane out of Green Island; plane reported that
a submarine had been challenged at 04-50 North - 148-01 East, course 270
degrees, speed ten knots; that the submarine did not reply and was attacked
with negative results, after a crash dive.  The BASHAN confirmed the
attack giving its position as 01-30 North - 147-26 East and at 1151K/13.

COUNTRY:  The search out of Nadzab was discontinued on the 12th, and
the search out of Green Island was initiated on the 10th.  Resulting con-
fusion might explain possible inadequacy of briefing.  It is noted that
there were no bombing restrictions in the areas in which the CERRO and the

— page 235 —
38203/A16-3
A/6(1)
DECLASSIFIED

From: The Commanding Officer,
To: The Commander Task Group Seventy One Point One,
Via: The Commander Submarine Division Sixty Two.

Subject: Special Mission to East Coast of
Pulu Laut Island.

Reference: (a) Annex "Charlie" to Commander Task Group
Seventy One Point One Operation Order
No. 39-43.

1. After consideration of reference (a) and
discussion with the agent of the Allied Intelligence Bureau
and Commander Submarine Division 62, it was decided to complete
the mission as soon as possible after transiting Lombok Strait.

2. The fourteenth of November was spent submerged
just east of the Lima Islands. Surfaed at 1699H and proceeded
to Lat. 40°16'3" Long. 117°19'1". About 1830H crossed the 100
fathom curve and proceeded at high speed towards Senbergelap
Island. The island was easily visible to the position 3047°3'
navigational aid to further proceed to the position 3047

— page 239 —
1. The Commanding Officer,
To : The Commander Task Force SUBVENTY-ONZ.
Subject: Special Mission.
Enclosure: (A) Subject Report.
(b) Track Chart.

1. Enclosure (A), covering the Special Mission conducted during the period 28 to 30 January, is forwarded herewith.

/a/ E. P. STEFANIDES, Tr.
E. P. STEFANIDES, Tr.

— page 242 —
784-71/16-3
Serial 0052
TID: 1
Fleet: 1
Date: 14/4/45
To: The Commander U.S.S. NORTH FLAG.
To: The Commander in Chief, UNITED STATES FLEET.
To: The Commander, NORTH FLAG.
Subject: U.S.S. TITAN (SS-203) - Report of Special Mission performed during Thirteenth Patrol - Comments on.

On 28 January, during her Thirteenth Patrol, the TITAN attempted unsuccessfully to perform a Special Mission on the Northwest Coast of BONITO at BIA ISLAND, or as an alternate site, AGAL BAY.

8. A party of seven Allied intelligence Bureau personnel under the command of Major R.C.L. CHESTER, 1st, 2d, 3d, 4th, was received on board on 17 January at PORT DARWIN. On 28 January a daylight submerged reconnaissance of the northwest Coast of BONITO between BIA ISLAND and AGAL BAY was performed and, as a result of the apparent activity in the area, Major CHESTER considered that a landing was not feasible. That decision was entirely in the spirit of the instructions under which the operation was planned, and is considered to have been soundly arrived at.

8. At 2142 on 30 January the party was transferred to BRAM, and TURA proceeded to assigned patrol area.

FLIGHT REPORT:
Chief of Staff.

DISTINGUISH:
Vice CO: (1)
Comdr: (1)
ComSub: (1)
GO USS TURA (1)
AID, DARWIN (1)
File: (1)

7. B. KILLER, Flag Secretary.

FLIGHT REPORT:
Chief of Staff.

DISTINGUISH:
Vice CO: (1)
Comdr: (1)
ComSub: (1)
GO USS TURA (1)
AID, DARWIN (1)
File: (1)

7. B. KILLER, Flag Secretary.

PITTSBURGH BANCROFT FILM

— page 245 —
3 March
1905 H
2005 H
2052 H
2056 H

2102 H
4 March
0538 H
1650 H
2200 H

5 - 14 March
Enroute Fremantle, Australia.

-2-

ENGLISURTE (A)

— page 246 —
15 March, 1945.
From: The Commander Submarines, SEVENTH FLEET.
To: The Commander in Chief, UNITED STATES FLEET.
Via: The Commander, SEVENTH FLEET.

Subject: U.S.S. TURNA (SESO) - Report of Special Mission performed on Thirteenth Per patrol - Comments on.

1. On 3 March, during the Thirteenth Per patrol, the TURNA successfully performed a Special Mission on the Northeast Coast of BURNO to the vicinity of LABUK BAY.

2. A party of seven Allied Intelligence Bureau personnel under the command of Major E.C.L. CHESTER, D.D., B.E., was received on board on 24 February at PORT D'ARTHUR. On 3 March, a daylight submerged reconnaissance run was made into LABUK BAY. At 2052 that night the party was launched in their boats and TURNA departed on schedule.

3. The Commanding Officer, officers and crew of the TURNA, as well as Major CHESTER and his party, are congratulated upon their expeditious accomplishment of an assigned Special Mission.

ELIOT H. BRYANT,
Chief of Staff.

DISTRIBUTION:
Vice Chief (1)
Comdr. (1)
Comdr. (1)
CO, USS TURNA (1)
AIB, DARTIN (1)
File (1)

J. B. MILLER,
Fleet Secretary.