U.S.S. SEAL (SS-183) — war patrol report SS-183_SEAL_Part2.pdf

— page 6 —
FF12-10/A16-3(5)/(16) SUBMARINE FORCE, PACIFIC FLEET
Serial 0752
[STAMP: CONFIDENTIAL (crossed out)]
[STAMP: DECLASSIFIED]

1d
Care of Fleet Post Office,
San Francisco, California,
June 12, 1943.

COMSUBPAC PATROL REPORT NO. 191
U.S.S. SEAL - SIXTH WAR PATROL.

From: The Commander Submarine Force, Pacific Fleet.
To : The Commander in Chief, Pacific Fleet.
Subject: U.S.S. SEAL (SS183) - Report of Sixth War Patrol.

Enclosure: (A) Copy of Subject War Patrol Report.
(B) Copy of Comsubron 2 Conf. ltr. FF5-44/A16-3,
Serial 021-B of June 5, 1943.
(C) Copy of Comsubron 2 Conf. ltr. FC5-4/A16-3,
Serial 032 of June 10, 1943.

1. The Sixth War Patrol of the SEAL was the first for the new
Commanding Officer. This war patrol was also the first after an extensive
overhaul on the West Coast.

2. Unfortunately, only a few contacts were made. [HANDWRITTEN: DECLASSIFIED-ART. 0445, OPNAVINST. 5510.1C]
[HANDWRITTEN: ONOGH] [HANDWRITTEN: #673]
Of the eight con-
tacts reported that could be attacked with torpedoes, three were hospital ships.
Of the five remaining contacts, attacks were made on two of them, of which one
was successfully carried out.

3. The Commander Submarine Force, Pacific Fleet, congratulates the
Commanding Officer, officers, and crew, for having inflicted the following
damage to the enemy:

SUNK
1 - Tanker (AKIBONO MARU Class) - 10,200 tons.

C. A. LOCKWOOD, Jr.

DISTRIBUTION
(1M-43)
List III, SS.
Special:
P1(5), EN3(5), Z1(5),
Comsublant (2), X3(1),
Comsubsovespac (2),
Subschool, IL (2),
Comtaskfor 72 (2),
Comsubron 50 (2),
Comsopac (2),
Cinclant (2),
Comtaskfor 16 (1).

[SIGNATURE: R. C. LAUVER]
R. C. LAUVER,
Flag Secretary.
[STAMP: FILMED]
[HANDWRITTEN: 50830]

— page 7 —
CONFIDENTIAL
Subject: U.S.S. SEAL - Report of Sixth War Patrol. Period
from 2 April 1943 to June, 1943. Operating under
Comsubpac Operation Order 58-43.

PROLOGUE: On 2 April arrived Pearl Harbor from Mare
Island, having completed first navy yard over-
haul since May 1940. 2-5 April 1943, voyage repairs
accomplished by U.S.S. SPERRY. 6-11 April training
period. Ready for sea 14 April 1943.

1. NARRATIVE

April 14, 1943
1300 (VW) Departed Submarine Base, Pearl Harbor, enroute Midway.
2000 (VW) Escort released.

April 15, 1943
1427 (VW) Sighted PB2Y patrol plane and exchanged recognition
signals.
Conducted drills and training dives.

April 16-17, 1943
Enroute Midway conducting daily drills and training
dives.

April 18, 1943
0529 (Y) Exchanged recognition signals with air escort.
0755 (Y) Moored alongside U.S.S. SIRIUS at Midway. Fueled to
capacity, receiving 14218 gallons fuel. Transferred
Ensign Leonard A Franz, U.S. Navy, to hospital, diag-
nosis appendicitis acute. Ensign John B. Griggs, III,
U.S. Navy, reported for duty from U.S.S. WAHOO.
1615 (Y) Departed Midway for patrol area.

April 19-20, 1943
0417 (Y) Crossed 180th meridian.
0635 (Y) Sighted plane bearing 160°T., 8 miles, submerged.
0748 (Y) Surfaced.
1255 (Y) Sighted plane bearing 340°T., 10 miles on easterly
course. Plane apparently did not see us.

April 21, 1943
0957 (Y) Sighted plane bearing 200°T., 10 miles, submerged.
1053 (Y) Surfaced.

April 24, 1943
0806 (K) Lat 21-22.5N, Long 157-38.1E. Sighted plane bearing
270°T., low altitude, closing. Submerged.
0830 (K) Surfaced.
2200 (J) Removed blanks from vent raisers of #3 and 4 fuel
ballast tanks to rig those tanks as diving tanks.

- 1 - ENCLOSURE (A)

CONFIDENTIAL
Jk
Subject: U.S.S. SEAL - Report of Sixth War Patrol.

— page 11 —
ld

CONFIDENTIAL

Subject: U.S.S. SEAL - Report of Sixth War Patrol.

May 14, 1943
2200(J) It became evident that target had increased speed to 15 knots.
2225(J) Target took big zig left to 180° T. It appears that by this time
        the target had become suspicious and started working around to the
        eastward.
2247(J) Target was on course 120° T, speed 16 knots. His bearing was 103°T,
        a position which we had been working for but he was now going the
        wrong way.
2352(J) Target was on northerly course. We remained to westward of target
        maintaining contact hoping that he would try to come west after moon-
        set at 0218.

May 15, 1943
        Chased target which remained on easterly courses for the rest of the
        night. Had closed to 7,000 yards at beginning of morning twilight.
0521(J) Submerged 9 miles north of FARAULEP ISLAND.
0527(J) Target bearing 085° T, range 12,000 yards, angle on the bow 60°
        starboard. Began submerged approach.
0615(J) Target no longer in sight. Sighted plane bearing 100° T, 6 miles.
1934(J) Surfaced. Set course for area.

May 16, 1943
2200(J) Entered area.

May 17, 1943
0459(J) Submerged. Lat. 9-12N, Long. 150-37E.
1915(J) Surfaced.
2216(J) Went to full speed on four engines to cover possible positions to
        eastward of NAMONUITO ISLAND of task force mentioned in ComSubPac
        despatch 170640.

May 18, 1943
0446(J) Submerged. Lat. 9-36N, Long. 150-58E.
1701(J) Heard distant dull explosion, apparently to southward.
1706(J) Heard first of eight distant explosions similar to depth charges.
1714(J) Heard first of eight more explosions. Nothing in sight.
1918(J) Surfaced.

May 19, 1943
0438(J) Submerged. Lat. 9-15N, Long. 150-38E.
1911(J) Surfaced.

May 20, 1943
0451(J) Submerged. Lat. 9-17N, Long. 150-43E.
1905(J) Surfaced.

- 6 - ENCLOSURE (A)

— page 12 —
## The Power of the Human Spirit: A Story of Resilience and Triumph

The human spirit is an extraordinary force, capable of overcoming the most daunting challenges and emerging stronger than ever. It is a testament to our innate capacity for resilience, hope, and the unwavering pursuit of a better tomorrow. This story explores the remarkable journey of a young woman named Anya, whose life took an unexpected turn, forcing her to confront her deepest fears and discover the indomitable strength within her.

Anya grew up in a small, vibrant village nestled amidst rolling hills and lush forests. Her childhood was filled with laughter, the warmth of family, and the simple joys of nature. She was a bright and curious girl, always eager to learn and explore the world around her. Her dreams were as boundless as the sky, and she envisioned a future where she could make a difference, leaving a positive mark on the lives of others.

However, fate had a different path in store for Anya. One fateful day, a devastating natural disaster struck her village, leaving behind a trail of destruction and despair. Anya lost everything she held dear – her home, her family, and the familiar world she had known. The once vibrant village was reduced to rubble, and the echoes of laughter were replaced by the haunting silence of loss.

In the aftermath of the tragedy, Anya found herself adrift, grappling with an overwhelming sense of grief and hopelessness. The weight of her losses threatened to crush her spirit, and for a time, she succumbed to the darkness that enveloped her. Yet, even in the depths of despair, a flicker of resilience remained, a tiny ember of

— page 14 —
CONFIDENTIAL                                                              rf
Subject:         . U.S.S. SEAL - Report of Sixth War Patrol.

— page 16 —
CONFIDENTIAL
                                                                Ge
SUMMARY OF SUBMARINE ATTACKS
SHIP U.S.S. SEAL (SS183)

— page 20 —
FB5-44/A16-3
Serial 021-B

CONFIDENTIAL

From: The Commander Submarine Division FORTY-FOUR.
To : The Commander Submarine Force, Pacific Fleet.

Subject: U.S.S. SEAL - Report of Sixth War Patrol - Comments.

1. The SEAL spent fifty days on her Sixth War Patrol. Twenty-nine
days elapsed between entry into first assigned area and departure from
second and last assigned area.

2. SEAL made five contacts with targets suitable for torpedo attack
during this patrol, but was able to attain an attack position on only two
of these contacts. The last of the five contacts was made while SEAL was en-
route from one assigned area to the other.

3. During the approach which ended in the first attack, the SEAL
found herself first on one bow of the target and then the other on several
occasions and was finally forced to use an unfavorable track. No hits were
obtained. Spread was applied to cover 100% of target length, but apparently
that was insufficient to compensate for control errors. There was no evidence
of unsatisfactory torpedo performance on this attack.

4. The second attack was conducted aggressively and resulted in
seriously damaging if not sinking a large tanker. Vigorous enemy counter
measures prevented immediate follow-up of this attack and no attempt was
made to locate the convoy after surfacing at night, as it was felt that the
convoy had reached its destination in Palau by that time.

5. SEAL tenaciously maintained contact with tanker on 14-15 May for
a period of about fifteen hours but radical maneuvers of target prevented
the submarine from getting closer than 7000 yards.

6. Condition of material was very good and appearance of ship
was excellent upon return from patrol.

ENCLOSURE (B)
SUBMARINE DIVISION FORTY-FOUR

F

Care of Fleet Post Office,
San Francisco, California,
June 5, 1943.

— page 21 —
SUBMARINE SQUADRON TWO Ge
Care of Fleet Post Office,
San Francisco, California.
June 10, 1943.

FC5-2/A16-3
Serial (032)
C-O-N-F-I-D-E-N-T-I-A-L

From: Commander Submarine Squadron TWO.
To: Commander Submarine Force, Pacific Fleet.

Subject: U.S.S. SEAL - Report of Sixth War Patrol -

1. The remarks of the Commander Submarine Division FORTY-FOUR on
the Sixth War Patrol of the U.S.S. SEAL are concurred in.

ENCLOSURE (C)

— page 22 —
U.S.S. SEAL (SS183)

                                                              24 July, 1943.

                                C-O-N-F-I-D-E-N-T-I-A-L
                                                              [STAMP: DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C]
                                                              BY [HANDWRITTEN: 000988] DATE [HANDWRITTEN: 6/15/71]

From:             The Commanding Officer, U.S.S. SEAL.
To:               Commander Submarines, Pacific Fleet.
Via:        (1) Commander Submarine Division TWENTY ONE.
            (2) Commander Submarine Squadron TWO.

Subject:          Report of Seventh War Patrol.

Enclosure:        (A) Subject Report.

1.                The subject report is forwarded herewith.

2.                The conduct of all hands, particularly dur-
ing the severe depth charge attack on 8 July, 1943, was in
accordance with the highest traditions of the Naval Service.

                                                              H. E. DODGE.

[HANDWRITTEN: FILMED]
[HANDWRITTEN: 132679]

— page 23 —
C-O-N-F-I-D-E-N-T-I-A-L
Subject: U.S.S. SEAL
Report of Seventh War Patrol.
Period 3 June 1943 to 24 July 1943. Operat-
ing under ComSubPac Operation Order 113-43.

Prologue: On 3 June 1943 arrived Midway from Sixth War
Patrol. 4 - 18 June 1943 refit accomplished by
Submarine Base, Midway. 20 - 21 June conducted
training. 24 June 1943 ready for sea.

1. NARRATIVE

June 24, 1943
1307 (Y) Departed Midway for patrol area accompanied by
air escort.
1841 (Y) Made trim dive.
1907 (Y) Surfaced.

June 25 - July 1, 1943
Enroute Midway to patrol area. Conducted daily
dives and drills. No contacts.

July 2, 1943.
0100 (K) Entered area. Set course for Todo Saki.
0355 (K) Submerged.
2120 (K) Surfaced.
2121 (K) Sighted lighted sampan. Lat. 39-10N. Long. 143-38E.
2230 (K) Sighted lighted sampan. Lat. 39-14N. Long. 143-21E.

July 3, 1943
0347 (K) Submerged. Lat. 39-26N. Long. 142-45E. Heavy fog.
2030 (K) Fog listed. Sighted land bearing 291°T.
2148 (K) Surfaced. Land contacts on SJ radar bearing
273°T, 45000 yards and 50000 yards. Position
uncertain as last fix was obtained on 1 July.
Light fog and rain had set in.

July 4, 1943
0345 (K) Submerged. Lat. 39-39N. Long. 142-27E. Fog.
1940 (K) Fog lifted. Closed land and identified Todo Saki,
bearing 330°T. distance 15 miles.
2137 (K) Surfaced. Weather overcast and foggy. Land con-
tacts on SJ radar between bearings 230°T. to 340°T,
closest range 24800 yards.

July 5, 1943
0341 (K) Submerged. Lat. 39-21N. Long. 142-14E. Fog.
0616 (K) Fog lifted.
0751 (K) Sighted sampan bearing 297°T., 4 miles, on
easterly course.

- 1 - ENCLOSURE (A).

— page 24 —
CONFIDENTIAL

U.S.S. SEAL

July 5, 1943
1125 (K) Sighted smoke bearing 355°T. Lat. 39-05N. Long.142-02E.
1128 (K) Began approach on convoy consisting of 3 freighters,
             1 small tanker and 1 Asashio class destroyer.
1324 (K) Fired 3 torpedoes from bow tubes at largest freighter
             (Estimated 8000 tons). Track 100 port, torpedo run
             2100 yards, depth setting 12 feet, 1° divergent spread.
             The sea was glassy and target must have seen torpedo
             tracks as he blew his whistle and turned away. The
             other ships turned toward the beach with the exception
             of the tanker. During the approach she had turned
             north from the head of the convoy, passing between
             them and the beach. After firing she was seen head-
             ing south on a course to cross our stern. The stern
             tubes were made ready but on the next look she had
             turned to seaward presenting her stern.
1338 (K) Destroyer approaching at high speed, rigged for depth
             charge attack and silent running, went deep.
1339 (K) First depth charge, close.
1343 (K) Two depth charges, close.
1344 (K) Sound could hear screws of searching vessels.
1722 (K) Two sets of distant explosions which sounded like
             sticks of bombs.
1810 (K) Pattern of 6 depth charges, not close.
1827 (K) Two distant explosions.
1839 (K) Depth charge or bomb fairly close.
1840 (K) Depth charge or bomb, farther away.
1946 (K) Two distant depth charges.
2121 (K) Started up to periscope depth.
2206 (K) Surfaced. Nothing in sight.

July 6, 1943
0344 (K) Submerged. Lat. 38-44N. Long. 142-52E.
1737 (K) Sighted raft with rails on two sides and unlighted light
             on standard in the middle. Lat. 38-46N. Long. 142-57E.
2125 (K) Surfaced. Weather overcast.

July 7, 1943
0347 (K) Submerged. Lat. 39-04N. Long. 142-09E.
0400 (K) Fog set in.
0537 (K) Sighted land bearing 272°T. Closed coast and iden-
             tified Kobe Zaki.
1030 (K) Sighted patrol boat bearing 270°T., 3000 yards, on
             northerly course. Lat. 39-06N. Long. 142-04E.
1423 (K) Sighted patrol vessel bearing 280°T., hull down on
             northerly course. Lat. 39-07N. Long. 142-02E.

- 2 -

ENCLOSURE (A).

— page 25 —
U.S.S. SEAL

CONFIDENTIAL

July 7, 1943
1540 (K) Sighted 3 ships, bearing 290°T., hull down on
southerly course, angle on the bow greater than 90°.
Believed to be two freighters and escort. Lat.
39-09N. Long. 142-02E.
1615 (K) Sighted single-float plane bearing 300°T. Sound
reported distant pinging.
2135 (K) Surfaced.

July 8, 1943
0047 (K) Sighted lighted sampan. Lat. 39-27N. Long. 142-34E.
0127 (K) Challenged by flashing light. Lat. 39-32N. Long.
142-33E. Maneuvered to avoid.
0340 (K) Submerged. Lat. 39-34N Long. 142-19E.
0840 (K) Sighted three ships bearing 326°T., 15000 yards.
Lat. 39-53N. Long. 142-10E. Began approach. Contact
turned out to be 4 freighters with one Asashio class
destroyer and one single-float plane escort. Sea was
calm with slight ripple.
0936 (K) Fired 3 torpedoes from bow tubes at 5000 ton freighter,
range 950 yards, track 103 port, 3° divergent spread.
No hits. Destroyer at this time was on port quarter.
Rigged for deep depth charge attack and went deep.
0940 (K) Two close depth charges 30 seconds apart.
0944 (K) Two depth charges very close.
0945 (K) Two depth charges still very close.
0946 (K) Two depth charges. Two sets of screws and echo ranging
from searching vessels.
1028 (K) One depth charge.
1035 (K) Three depth charges, fairly close.
1036 (K) Pattern of five depth charges, close aft.
1146 (K) Four distant depth charges. Pinging getting weaker.
1201 (K) Distant explosion.
1213 (K) Distant explosions.
1218 (K) Six depth charges getting closer.
1227 (K) One depth charge not close.
1254 (K) One depth charge fairly close.
1257 (K) One depth charge closer.
1305 (K) Two depth charges astern.
1313 (K) Two depth charges astern.
1334 (K) Depth charge astern.
1358 (K) Two depth charges.
1401 (K) Three depth charges.
1505 (K) Two strings of bombs to port.
1511 (K) Distant explosion.

- 3 -

ENCLOSURE (A).

— page 26 —
U.S.S. SEAL

CONFIDENTIAL

July 8, 1943
1512 (K) Lost sound contact.
1515 (K) Explosion to port.
1516 (K) Explosion to starboard.
1529 (K) Explosion to starboard.
1530 (K) Explosion to port.
1604 (K) Four bombs to port, closer.
1607 (K) Two bombs to starboard.
1740 (K) Five bombs to port.
1743 (K) One bomb to starboard.
1744 (K) One bomb to starboard.
1745 (K) Two bombs to starboard.
1748 (K) One bomb.
1912 (K) One bomb to port.
1921 (K) One bomb to port.
2205 (K) Surfaced.

July 9, 1943.
0330 (K) Submerged. Lat. 39-23N. Long. 143-57E.
During the day sighted bubbles forward through peri-
scope. Began looking for air leaks.
2135 (K) Surfaced.
Inspected topside for leaks and loose gear which had
caused rattle while submerged. Nothing found.
2255 (K) Sighted lighted sampan. Lat. 38-55N. Long. 143-58E.

July 10, 1943
0347 (K) Submerged. Lat. 38-46N. Long. 143-26E.
Continued attempts to locate air leak. Found stiffener
in superstructure which had carried away causing rattle.
2143 (K) Surfaced.
2315 (K) Sent message to ComSubPac.

July 11, 1943
0338 (K) Submerged. Lat. 38-43N. Long. 144-29E. Bubbles still
escaping forward. May be fuel.
1725 (K) Sighted two sampans bearing 269° and 309°, on easterly
courses. Lat. 39-16N. Long. 144-31E.
2125 (K) Surfaced. Thick fog.

- 4 -

ENCLOSURE (A).

— page 27 —
U.S.S. SEAL

CONFIDENTIAL

July 12, 1943
                     During night transferred fuel from No. 1 and 2 fuel
                     tanks to No. 3, 4 and 8.
0338 (K) Submerged. Lat. 39-28N. Long. 144-42E. Bubbles still
                     escaping forward.
2120 (K) Surfaced. Fogg.

July 13, 1943
0525 (K) Flooded down with water over the deck, checking for
                     leaks. Found oil slick formed under breech of gun
                     and wash away and exact source could
                     not be located. Decided to transfer fuel from 5 and
                     6 to 1 and 2 during next night.
0600 (K) Submerged. Lat. 39-27N. Long. 146-58E.
2123 (K) Surfaced.
                     During night inspected fuel tank vent risers with soapy
                     water, no leaks found. Transferred fuel from No. 5 and
                     6 to No. 1 and 2.

July 14, 1943
0510 (K) Flooded down. Again found slick at breech of gun.
                     The sea was calmer than yesterday and bubbles of oil
                     were found to be rising alongside portside abreast of
                     the gun. All fuel tanks forward have been empty at one
                     time or other with the leak persisting. Decided to
                     head for Midway.
0528 (K) Submerged. Lat. 39-24N. Long. 147-00E.
2105 (K) Surfaced.
2237 (K) Sent message to ComSubPac.

July 15-19, 1943
                     Enroute Midway.

- 5 -

ENCLOSURE (A).

— page 28 —
U.S.S. SEAL

CONFIDENTIAL

July 20, 1943
0526 (Y) Sighted Air escorts.
0610 (Y) Joined PLUNGER.
0941 (Y) Moored alongside SARGO at Submarine Pier, Midway.
1728 (Y) Underway for Pearl Harbor accompanied by air escort.
1900 (Y) Air escort departed.
1955 (Y) Made trim dive.
2018 (Y) Surfaced.

July 21-22, 1943
          Enroute Pearl Harbor.

July 23, 1943
1540 (X) Sighted masts of ship dead ahead.
1620 (X) Exchange recognition signals with tanker.

July 24, 1943
0120 (W) Sighted tanker which we had been informed about by
          Commander Submarines. Range 6000 yards.
          Manouvered to avoid.
0550 (W) Made rendezvous with escort.
1043 (W) Moored starboard side to Pier S-9, Submarine Base,
          Pearl Harbor, T.H.

- 5 1/2 -

ENCLOSURE (A)

— page 29 —
U.S.S. SEAL.

CONFIDENTIAL
2. WEATHER
Enroute to station weather was moderate, sky almost
Continuously overcast.

In area there was fog 45%, heavily overcast 40%,
and partially cloudy the remaining 15% of the time. The
average temperature was 70°. The seas were moderate ex-
cept within ten miles of Honshu where they were calm and
usually glassy.

3. TIDAL INFORMATION
The currents experienced agreed with the information
contained in the Coast Pilot.

4. NAVIGATIONAL AIDS
No navigational aids were observed.

5. DESCRIPTION OF SHIPS SIGHTED

Time (LCT)
No. Date Position N E Course Speed Description
---
1. 1128 39-05 215 7 3 Freighters,
   7-5 142-14 1 Tanker,
                       1 Asashio
                       Class DD.

2. 1030 ----- 39-06 Northerly ? Patrol boat.
   7-7 ----- 142-04

3. 1423 ----- 39-07 Northerly ? Patrol boat.
   7-7 ----- 142-02

4. 1540 ----- 39-09 Southerly ? 2 Freighters,
   7-7 ----- 142-02 1 Escort vessel,
                       1 Plano escort.

5. 0840 ----- 39-53 ----- 8 4 Freighters,
   7-8 ----- 142-10 1 Asashio Class DD,
                       1 Plano escort.

- A total of seven fishing sampans were sighted at various times.

- 6 -

ENCLOSURE (A).

— page 31 —
U.S.S. SEAL

CONFIDENTIAL

7. SUMMARY OF SUBMARINE ATTACKS. Ship: U.S.S. SEAL

| Attack | | No. 1 | | No. 2 |
|---|---|---|---|---|
| Time | : | 0224 | : | 2336 |
| Date | : | 5 July 1943 | : | 7 July 1943 |
| Location- (Lat.) | : | 39-05 N | : | 39-53 N |
| (Long.) | : | 142-02 E | : | 142-10 E |
| Number and Type Torpedoes | | | | |
| Fired on Each Attack | : | 3 | : | 3 |
| | : | Mk 14 - 3A | : | Mk 14 - 3A |
| Hits | : | 0 | : | 0 |
| Number Sunk (Tonnage) | : | 0 | : | 0 |
| Number Damaged or | | | | |
| Probably Sunk (Tonnage) | : | 0 | : | 0 |
| Type of Target | : | Freighter | : | Freighter |
| Range | : | 2000 | : | 2000 |
| Type of Attack: Periscope | | | | |
| Surface (S) Night (N) Radar (R) | : | P | : | P |
| Estimated Draft of Target | : | 18 feet | : | 15 feet |
| Torpedo Depth Setting | : | 12 feet | : | 12 feet |
| Bow or Stern Shot | : | Bow | : | Bow |
| | : | 99 P | : | 103 P |
| Track Angle | : | 100 P | : | 113 P |
| | : | 101 P | : | 118 P |
| | : | 14 L | : | 3 L |
| Gyro Angle | : | 15 L | : | 13 L |
| | : | 16 L | : | 18 L |
| Estimated Target Speed | : | 7 Kts. | : | 8 Kts. |
| Firing Interval | : | 10 Sec. | : | 10 Sec. |
| Spread - Amount and Kind | : | 1° Div. | : | 3° Div. |
| Was Torpedo Performance | | | | |
| Satisfactory? | : | Yes | : | Believe not* |

Remarks: * Believe torpedo(s) ran deep.

- 8 -

ENCLOSURE (A).

— page 32 —
U.S.S. SEAL

CONFIDENTIAL
8. ENEMY A/S MEASURES

It is believed that all coastwise shipping now travels
in convoy with both surface and air escorts. Additional A/S
forces are sent out when the presence of a submarine is known.

In both instances on this patrol the initial attacks by
surface vessels were well executed. They were, however, shaken
off and their subsequent search was not too persistent.

No echo ranging was heard before or after the attack on
5 July.

The escort of the convoy sighted on 7 July was conducting
an echo ranging search.

After the attack on 8 July two sets of screws were heard
on searching vessels. One vessel was echo ranging.

We were no doubt leaving a small slick after the attack
on 8 July, as planes continued to drop in our immediate
vicinity until after sunset.

A total of 72 depth charges and bombs were dropped.

The depth was approximately 200 feet when the closest
depth charges were received in the attack of 8 July. The
explosions appeared to be directly overhead and caused a
marked downward acceleration of the boat. Depth control was
regained at 302 feet.

Superficial damage only was sustained inside the ship,
such as knocking off of paint and cork, derangement of gauges,
shattering of a few light bulbs. A small leak was started
in the fuel transfer line in the pump room. A leak was
started in No. 2 auxiliary tank which resulted in the boat
getting heavy. Depth control was maintained by blowing from
No. 3 auxiliary which had been fully flooded.

During evasion ran at 260 feet. All depth charges
sounded as though they were set at something less than that
depth.

- 9 -

ENCLOSURE (A)

— page 33 —
U.S.S. SEAL

CONFIDENTIAL
9. ENEMY MINE SWEEPING OPERATIONS
   None encountered.

10. MAJOR DEFECTS
    Fuel oil leak resulting from depth charging. Exact
    location as yet undetermined.

11. RADIO RECEPTION
    1. Receiving conditions were generally good at night,
       but inconsistent during the day. Reception tests made on
       113, 9090 and 12540 kcs. gave the following results:
       Transmissions on 113 kcs. could not be heard; transmission
       on 9090 and 12540 kcs. were received with average signal
       strength and readability of 5. There was slight inter-
       ference by stations on nearby frequencies which could be
       reduced by sharp tuning. Static was negligible.

    2. Difficulty was encountered in communicating with
       N P H from the area because of a Jap station near 8470 kcs.
       It was not possible to determine whether this was enemy
       traffic or an attempt to jam that frequency.

    3. No Serials were missed.

    4. SJ RADAR
       The only contacts made were on land peaks. Greatest
       range obtained was approximately 55000 yards.

    5. SD RADAR
       The only contacts made were own escort planes. Opera-
       tion satisfactory.

- 10 -

ENCLOSURE (A).

— page 34 —
U.S.S. SEAL

CONFIDENTIAL

12. SOUND CONDITIONS
Sound conditions were in general good. During both attacks
target screws were picked up at about 10000 yards. Fish noises
were present a great deal of the time.

The area was generally characterized by a negative tempera-
ture gradient which was most pronounced in the southern part of
the area.

13. HEALTH AND HABITABILITY
In general excellent.

On the two occasions when the ship was rigged for silent
running for long periods the CO2 concentration in the control
room reached 2 1/2% just prior to surfacing.

14 and 15. MILES AND FUEL

| | Miles | Fuel |
|---|---|---|
| Midway to area | 2004 | 19962 |
| On Station | 1104 | 6323 |
| Return to Midway | 2105 | 25952 |
| Midway to Pearl | 1235 | 19467 |
| TOTALS | 6448 | 71704 |

16. FACTORS OF ENDURANCE REMAINING

| Torpedoes | Fuel | Provisions | Water | Personnel |
|---|---|---|---|---|
| 14 | 20506 | 40 days | Unlimited | 30 days. |

17. FACTOR CAUSING END OF PATROL
Fuel leak resulting from enemy depth charging.

18. REMARKS
None.

- 11 -

ENCLOSURE (A)

— page 35 —
COMMANDER SUBMARINE DIVISION TWENTY-ONE

FB5-21/A16-3/ejm c/o Fleet Post Office,
San Francisco, Calif.

Serial 019
25 July, 1943.

CONFIDENTIAL

From: The Commander Submarine Division TWENTY ONE.
To : The Commander Submarine Force, PACIFIC FLEET.
Via : The Commander Submarine Squadron TWO.

Subject: U.S.S. SEAL - Report of Seventh War Patrol -
Comments on.

1. The SEAL spent a total of thirty days on this patrol:
of this time only twelve days were spent in the area. Early de-
parture from the assigned area was necessitated by oil leaks
which developed after severe depth charging on July 8, 1943.

2. ATTACKS:

(a) July 5 - Undoubtedly the misses on this attack
were occasioned by evasive tactics after torpedo tracks were
sighted. With a glassy sea it is essential that a closer firing
range be sought. A one degree (1) divergent spread is consi-
dered insufficient at this range (2100 yards) on this type of tar-
get. It is noted that in the latter stages of this approach the
stern tubes were made ready for a possible shot at another target.
In an attack on any valuable target, and especially a convoy, it
is believed sound practice to make ready all tubes sufficiently
early to take care of all possibilities.

(b) July 8 - The three misses on this attack are not
understandable, especially at this range (950 yards). It is
again believed that a larger spread should have been used.

3. The SEAL returned from this patrol in very good mate-
rial condition, except for the air and oil leaks caused by sev-
ere depth charging. She will be refitted at the Submarine Base,
Pearl Harbor, in the normal refit period.

C. O. HUMPHREYS.

— page 36 —
SUBMARINE SQUADRON TWO

FC5-2/A16-3/rrg
Serial ( 064 )
C-O-N-F-I-D-E-N-T-I-A-L

c/o Fleet Post Office
San Francisco, Calif.

July 27, 1943.

FIRST ENDORSEMENT to
CSD 21 ltr. FB5-21/A16-3,
Serial 019, dated 25 July, 1943.

From: Commander Submarine Squadron TWO.
To: Commander Submarine Force, Pacific Fleet.
Subject: U.S.S. SEAL - Report of Seventh War Patrol -
Comments on.

1. Forwarded.

C. B. MOMSEN.

— page 37 —
FF12-10/A16-3(5)/(16) SUBMARINE FORCE, PACIFIC FLEET 1d
Serial 0963
CONFIDENTIAL

COMSUBSPAC PATROL REPORT NO. 222
U.S.S. SEAL - SEVENTH WAR PATROL.

Care of Fleet Post Office,
San Francisco, California,
28 July 1943.

From: The Commander Submarine Force, Pacific Fleet.
To : Submarine Force, Pacific Fleet.
Subject: U.S.S. SEAL (SS183) - Report of Seventh War Patrol.
Enclosure: (A) Copy of subject war patrol report.
(B) Copy of Comsubdiv 21 Conf. ltr. FF5-21/A16-3/ejm,
Serial 019 of 25 July 1943.
(C) Copy of Comsubron 2 Conf. 1st. end. FC5-2/A16-3/rrg,
Serial 064 of July 27, 1943.

1. The seventh war patrol of the SEAL was the second for the present
Commanding Officer.

2. The patrol was carried out in an area normally heavy with convoys
and recently with enemy anti-submarine measures. This patrol proved no exception.

3. The SEAL carried out two unsuccessful attacks and was heavily
depth charged after the second which caused a fuel oil leak that could not be
located. This forced an early termination of the patrol.

DISTRIBUTION:
(Complete Reports)
Cominch (5)
VCNO (5)
Cincpac (5)
Serforpac (5)
Adv. Base Plan. Unit (1)
CincLant (2)
Comsublant (8)
S/M School, NL (2)
Comsopac (2)
Comwessec (2)
Comsubowespac (1)
Comsubowespac (2)
CTF 72 (2)
CTF 16 (1)
Comsubspac (10)
SUBAD, MI (2)
Comsubcomsubpac
Midway (2)
All Squadron and Div.
Commanders, Subspac (2)
U.S.S. SEAL (1)

[HANDWRITTEN: Recorded]

C. A. LOCKWOOD, Jr.
[STAMP: RECEIVED]
[STAMP: 16 AUG 1943]
[STAMP: FILE 10-16-E-2]
[STAMP: USS No. A16-3/rrg]
[STAMP: Asst. No. 90782-e]
[STAMP: App. No. 1N]

(COMSUBSPAC Endorsement only:)
All Submarines, Subspac (1)

[SIGNATURE: R. C. LAWVER]
R. C. LAWVER,
Flag Secretary.

— page 38 —
C O N F I D E N T I A L
[STAMP: DECLASSIFIED]
SS183/W.P.R.#8/A16

U.S.S. SEAL (SS183)

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY [HANDWRITTEN: OF09B4] DATE [HANDWRITTEN: 6/15/72]

From : The Commanding Officer.
To : The Commander Submarine Force, Pacific.

Via : The Commander Submarine Division TWENTY ONE.
The Commander Submarine Squadron TWO.

Subject : Report of Eighth War Patrol.

Enclosure: (A) Subject report.

1. Enclosure (A) is forwarded herewith.

H.B. DODGE.

[HANDWRITTEN: FILMED]
[HANDWRITTEN: 57642]

— page 39 —
C O N F I D E N T I A L
Subject : U.S.S. SEAL - Report of Eighth War Patrol. Period
24 July 1943 to October 1943. Operating under
COMSUBPAC Operation Order 165-43.

Prologue : On 24 July 1943 arrived Pearl Harbor from Seventh War
Patrol. 25 July - 7 August 1943, refit accomplished
by SubDiv 21 relief crew and HOLLAND. 8 - 14 August
1943 training and loading. 15 August 1943 ready for
sea.

1. NARRATIVE

15 August 1943
1300 (VW) Underway from Submarine Base, Pearl Harbor.

2020 (VW) Released surface escort.

16 - 18 August 1943
Enroute Pearl Harbor to Midway. Conducted daily dives,
drills and battle problems. Sighted own aircraft as
indicated in paragraph 6.

19 August 1943
0500 (Y) Joined by air escort.

0752 (Y) Moored to Submarine Pier, Midway.
Received fuel and water and effected repairs to T.D.C.

1656 (Y) Underway for patrol area.

19 - 25 August 1943
Enroute to patrol area. Conducted daily dives and drills.
No contacts.

26 August 1943
0436 (K) Submerged. Lat 43-17 N. Long 154-22 E.

1152 (K) Sighted fishing trawler on southerly course.
Lat 43-23 N. Long 153-55 E.

1947 (K) Surfaced.

27 August 1943
0110 (K) Entered area.

0404 (K) Submerged. Lat 43-41 N. Long 151-04 E.

1959 (K) Surfaced.

1 ENCLOSURE (A)

— page 40 —
C O N F I D E N T I A L
Subject : U.S.S. SEAL - Report of Eighth War Patrol. - - - - - -

28 August 1943
0359 (K) Submerged. Lat 43-39 N. Long 148-34 E.

2001 (K) Surfaced.

29 August 1943
0419 (K) Submerged. Lat 43-40 N. Long 146-58 E.

2015 (K) Surfaced. Heavy fog.

2255 (K) Picked up Shikotan To by radar bearing 310°T, 18 miles.
           Passed to eastward of Shikotan To and stood north toward
           Etorofu Shima.

30 August 1943
0414 (K) Submerged. Lat 44-20 N. Long 147-06 E.

0750 (K) Sound picked up light fast screws on port bow. Bearing
           changed rapidly aft and was soon lost astern. Visibility
           was very poor and nothing could be seen through periscope.
           Believed to be small boat.

2010 (K) Surfaced. EtorofuShima bearing 318°T, 30 miles, by
           radar. Heavy fog.

31 August 1943
0410 (K) Lat 44-19 N. Long 146-56 E. While diving, when the
           conning tower hatch was closed, the latch failed to catch,
           and the hatch flew open. Flooded 2 feet of water over
           floor plates in the pump room before boat could be sur-
           faced. Headed for the open sea to inspect for and repair
           damage.

0530 (K) Water was all pumped out and submerged. Control room was
           the only compartment which took water.
           The following equipment was out of commission due to
           flooding:
           Both H.P. air compressor motors.
           Both air-conditioning compressor motors.
           Air-conditioning circulating water motor.
           Refrigerator compressor motor.
           Refrigerator circulating water motor.
           200# air compressor motor.
           Overspeed trip #1 low-pressure blower.
           Lower limit switch for vertical antenna hoist.
           Master gyro compass.
           Constant frequency control unit.
           Bow plane controller.

2016 (K) Surfaced.

-2- ENCLOSURE (A)

— page 41 —
C O N F I D E N T I A L
U.S.S. SEAL - Report of Eighth War Patrol.

1 September 1943
0405 (K) Submerged. Lat 44-00 N. Long 150-40 E.
          Continued work repairing damage, concentrating on H.P.
          air compressors.
2000 (K) Surfaced.

2 - 8 September 1943
          Cruised in southeast corner of area working on damaged
          equipment and learning to operate without using air. All
          damaged equipment was returned to service except the
          H.P. air compressors which were given up as hopeless.
          Decided to proceed to Okhotsk Sea and use air from re-
          load torpedoes if necessary. At 1905 (K) 8 September
          1943 set course for Etorofu Kaikyo.

9 September 1943
0412 (K) Submerged. Lat 45-07 N. Long 149-58 E.
1243 (K) Sighted Uruppo To bearing 290°T.
2000 (K) Surfaced. Piloted through Etorofu Kaikyo by radar.
          The Engineer Officer perfected and placed in operation
          a jury air-compressor utilizing #2 cylinder of #1 main
          engine. This rig gave a pressure of 375 lbs. per square
          inch which was sufficient for impulse air.

10 September 1943
0335 (K) Radar contact bearing 330°T, range 8700 yards, Lat
          45-53 N. Long 148-58 E.
0405 (K) Closed to 4000 yards, sighted small ship, identified
          as fishing trawler, on course 060°T.
0408 (K) Submerged.
1204 (K) Sighted fishing trawler bearing 077°T, course 220°T.
1955 (K) Surfaced.

11 September 1943
0415 (K) Submerged. Lat 46-04 N. Long 149-15 E.
1945 (K) Surfaced.

12 September 1943
0423 (K) Submerged. Lat 46-25 N. Long 147-39 E.
2003 (K) Surfaced.

                                        -3-
                                                            ENCLOSURE (A).

— page 43 —
C O N F I D E N T I A L
Subject : U.S.S. SEAL - Report of Eighth War Patrol.
---
17 September 1943 (cont-)
1314 (K) Escort approaching with zero angle on the bow, went
          deep and rigged for depth charge attack.

1317 (K) First of four depth charges.

1340 (K) Lost sound contact.
1440 (K) Went to Periscope depth. Periscope was so badly fogged
          up from low temperature at deep submergence that it was
          useless for sky search.

1820 (K) Periscope fairly clear, no evidence of air activity.
          Surfaced and began chase of convoy.

18 September 1943
          Covered sector between 065° and 075°T from attack
          position and speeds up to 11 knots with no contact.

0435 (K) Submerged. Lat 47-06 N. Long 147-35 E.

1945 (K) Surfaced.

19 September 1943
0422 (K) Submerged. Lat 47-07 N. Long 150-02 E.

1925 (K) Surfaced.

20 September 1943
0410 (K) Submerged. Lat 46-44 N. Long 151-28 E.

1211 (K) Heard 3 distant explosions.

1212 (K) Heard 3 distant explosions.

1550 - 1552 (K) Heard 3 distant explosions.

1915 (K) Surfaced.

21 September 1943
0421 (K) Submerged. Lat 46-37 N. Long 150-41 E.

1912 (K) Surfaced.

22 September 1943
0425 (K) Submerged. Lat 45-55 N. Long 149-27 E.

1920 (K) Surfaced.

-5- ENCLOSURE (A)

— page 44 —
C O N F I D E N T I A L
Subject : U.S.S. SEAL - Report of Eighth War Patrol.

23 September 1943
0421 (K) Submerged. Lat 46-08 N. Long 150-38 E.

1932 (K) Surfaced.

During the night sighted a number of fishing sampans,
some showing a single white light and others unlighted.
All appeared to be heading for the southeastern tip of
Uruppo To.

24 September 1943
0422 (K) Submerged. Lat 45-38 N. Long 150-04 E.

1930 (K) Surfaced.

25 September 1943
0418 (K) Submerged. Lat 45-04 N. Long 151-35 E.

1415 (K) Departed area. Set course for Midway.

1917 (K) Surfaced.

26 - 29 September 1943
Enroute Midway.

30 September 1943
0725 (Y) Join by air escort.
1000 (Y) Moored in nest alongside SPERRY at Submarine Pier,
Midway.
1700 (Y) Underway from Midway.

1 - 3 October 1943
Enroute Midway to Pearl Harbor.

4 October 1943
0620 (VW) Rendezvous with TROUT and escort.
1049 (VW) Moored at Submarine Base, Pearl Harbor.

5 1/2 ENCLOSURE (A)

— page 45 —
CONFIDENTIAL
Subject : U.S.S. SEAL - Report of Eighth War Patrol.

2. WEATHER
Going to and from area seas were moderate. Sky was partially
cloudy 42%, overcast 50%, fog or rain 8%.

In the area seas were moderate. Partially cloudy 32%, over-
cast 45%, fog or rain 23%.

The average temperature in the area was 60°.

3. TIDAL INFORMATION
South of the Kurile chain a current of about 1/2 knot to
the northeast was experienced and could be predicted by the com-
paratively warm temperature of the water.

In the Sea of Okhotsk a current of about 1/2 knot to the
northwest was experienced.

Within twenty miles of the Kurile Islands currents as
affected by tides agreed generally with those described in the
Japan Pilot and on charts.

4. NAVIGATIONAL AIDS
No navigational aids were sighted.

-6- ENCLOSURE (A)

— page 46 —
CONFIDENTIAL
Subject : U.S.S. SEAL - Report of Eighth War Patrol. - - - - -

5. DESCRIPTION OF SHIPS SIGHTED
No. | Time (LCT) | Date | Position | N | Course | Speed | Description
--- | --- | --- | --- | --- | --- | --- | ---
1. | 1152 | 8-26 | 43-23 | | Southerly | 6 | Fishing trawler
   |      |      | 153-55 | |           |   |
2. | 0405 | 9-10 | 45-53 | | 060 | 6 | Fishing trawler
   |      |      | 148-58 | |     |   |
3. | 1204 | 9-10 | 46-04 | | 220 | 6 | Fishing trawler
   |      |      | 149-15 | |     |   |
4. | 1040 | 9-13 | 46-20 | | 240 | 9 | AM 1 class minesweeper
   |      |      | 144-22 | |     |   |
5. | 1316 | 9-14 | 46-06 | | 220 | 9 | AM 1 class minesweeper
   |      |      | 143-53 | |     |   | Russian freighter
   |      |      |        | |     |   | similar to ONI 208 R
   |      |      |        | |     |   | P 16
6. | 1440 | 9-14 | 46-06 | | 060 | 9 | 1 freighter similar
   |      |      | 143-54 | |     |   | to ONI 208 J P 125
   |      |      |        | |     |   | 1 smaller freighter
7. | 1245 | 9-17 | 46-06 | | 070 | 9.5 | 1 AM 1 class minesweeper
   |      |      | 143-50 | |     |     |

6. AIRCRAFT SIGHTED
No. | Time (LCT) | Date | Position | Description
--- | --- | --- | --- | ---
1. | 0700 | 8-16 | 24-11 N. | PB2Y
   |      |      | 160-58 W. |
2. | 1200 | 8-16 | 25-04 N. | B24
   |      |      | 162-12 W. |
3. | 1215 | 8-16 | 25-06 N. | PB2Y
   |      |      | 162-16 W. |
4. | 0956 | 8-17 | 26-20 N. | PB2Y
   |      |      | 167-04 W. |

- 7 - ENCLOSURE (A)

— page 48 —
C O N F I D E N T I A L
Subject: U.S.S. SEAL - Report of Eighth War Patrol. - - - -

8. ENEMY ANTISUBMARINE MEASURES
    The escort of the convoy attacked on 17 September was
    patrolling the left flank of the column. After the attack four
    depth charges were dropped fairly close. The subsequent search
    was very perfunctory. Echo ranging was not employed.

    The minesweeper sighted on 12 and 13 September may have
    been engaged in an A/S patrol.

    The fishing trawler sighted on 26 August was well equipped
    with radio antennae and was probably part of the picket line.

9. ENEMY MINE SWEEPING OPERATIONS
    None observed.

10. MAJOR DEFECTS
    1. Engineering
        Both H.P. air compressors motor armatures require re-
        winding.

        Steering motor armature burned out.

        All electrical apparatus in pump room requires thorough
        overhaul because of flooding.

    2. Ordnance
        A pin in the target bearing gear train of the Torpedo
        data Computer has sheared three times during the patrol.
        The cause has not yet been determined.

11. RADIO RECEPTION
    1. Receiving conditions were generally very good. While in
    the area, reception on 8230 kcs. with good signal strength and
    readability was experienced until about one hour before morning
    twilight at which time fading increased.

    2. Reception on lower frequencies was unsatisfactory at all
    times while in area. Results of reception tests made on 16.8 kc.
    with the submerged loop antenna were as follows: NPM was not
    received at depths of more than fifty-five feet, nor at a distance
    of more than thirty miles from Lualuali while submerged. NPM
    could not be heard with this antenna while on the surface at a
    distance of 100 miles from the point of transmission.

    3. Difficulty was encountered in communicating with NPM at a
    distance of 700 miles west of Midway and as a result my 280600
    was routed through NXZ.

-9- ENCLOSURE (A)

— page 49 —
C O N F I D E N T I A L
Subject - : U.S.S. SEAL - Report of Eighth War Patrol. - - - -

11. RADIO RECEPTION (cont-)

SJ RADAR
Radar performance was excellent. Radar was used to advant-
age for piloting in the Kurile Islands during low visibility
conditions. Ranges on land peaks exceeded 60000 yards.

SD RADAR
Plane contacts were few. On two occasions radar contact
was made on friendly planes, at 7 miles, before sighting.

12. SOUND CONDITIONS AND DENSITY LAYERS

1. Sound conditions were in general only fair. The maximum
range of screws heard was less than 5000 yards.

2. In the western part of the area two density layers were
encountered, one at 65 feet and one at about 150 feet, separated
by a steep negative gradient which averaged about 0.5° per foot.

13. HEALTH AND HABITABILITY

In general excellent.

14. and 15. MILES AND FUEL

| | MILES | FUEL |
| :| :---- | :----- |
| Pearl to Midway | 1302 | 15122 |
| Midway to area | 1744 | 14708 |
| On station | 3167 | 23184 |
| Return to Midway | 1758 | 20850 |
| Midway to Pearl | 1320 | 25820 |
| TOTAL | 9291 | 99684 |

16. FACTORS OF ENDURANCE REMAINING

| Torpedoes | Fuel | Provisions | Water | Personnel |
| :| :--- | :| :------ | :|
| 16 | 10717 | 20 days | Unlimited | 10 days |

17. FACTOR CAUSING END OF PATROL

Provisions of Operation Order.

-10- ENCLOSURE (A)

— page 50 —
CONFIDENTIAL
Subject : U.S.S. SEAL - Report of Eighth War Patrol.
18. REMARKS

1. After the flooding on 31 August, the following routine
was evolved to conserve air:

The 200# air compressor was used to supply service air.
During the night, while on the surface, a pressure of 80 lbs. per
square inch was built up in forward trim tank, which was used to
build up a pressure of two inches inside the boat while submerged.
This pressure was sufficient to surface, under all conditions of
sea encountered, by using only the turbo blow.

Negative tank was not used. The main engines were started by
motoring. The after engines were started first and then the gen-
erator engines.

Impulse air was kept up with the jury air compressor.

The only place where high pressure air was used was the air
flask of the hydraulic accumulator.

2. The Engineer Officer, Ensign C.E. FROST, U.S.N., is de-
serving of special praise for his ingenuity in devising the jury
air compressor.

3. The Russian ship encountered on 14 September was flying
the Russian flag at the gaff, and had the Russian flag, surrounded
by a white border, painted on the side just below the bridge.

-11- ENCLOSURE (A)

— page 51 —
COMMANDER SUBMARINE DIVISION TWENTY-ONE

FB5-21/A16-3/hgd
Serial 039

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

FIRST ENDORSEMENT to
USS SEAL Report of
Eighth War Patrol

From: The Commander Submarine Division TWENTY-ONE.
To : The Commander Submarine Force, Pacific Fleet.
Via : The Commander Submarine Squadron TWO.

Subject: U.S.S. SEAL - Report of Eighth War Patrol -
Comments on.

1. The Eighth War Patrol of the SEAL covered a
period of fifty days, twenty-nine of which were spent in the
assigned area. Four days after entering the area the SEAL
flooded her pump room, necessitating her withdrawal to sea
for one week to effect repairs. This casualty (failure to
close the conning tower hatch properly) was most elementary
and inexcusable, and greatly handicapped the SEAL during
the remainder of this patrol. It is not possible to over-
emphasize the absolute necessity of this basic training in
order to overcome these acts of carelessness.

2. Due to the above casualty the SEAL was not
able to operate and cover the area as efficiently as ordinarily.
Only one worth while contact was made, and with the excellent
firing position obtained, it is not understood why at least
one hit was not made, except possibly for an over estimate of
the draft of target and depth performance of torpedoes.

3. Extensive electrical work will be necessary to
ready the SEAL for her next patrol. This work and refit will
be accomplished by the HOLLAND, and it is estimated that approxi-
mately four weeks will be required.

4. It is noted that after losing her high pressure
air compressors the SEAL resorted to the 200# air compressor.
While it is admitted that a repetition of this type of casualty
is unlikely, it is believed the decision to retain the 200#
air compressor was very sound.

5. Ensign C.E. FROST, U.S.N., is commended for his
ingenuity and untiring efforts in devising a "jury rig" air
compressor and the full story on this will be published in
Squadron Two Material Bulletin.

[SIGNATURE: C. O. Humphreys]
C. O. HUMPHREYS.
Care of Fleet Post Office,
San Francisco, California
5 October, 1943

— page 52 —
FC5-2/A16-3 SUBMARINE SQUADRON TWO
Serial ( 0130 ), 60/dv
c/o Fleet Post Office,
C-O-N-F-I-D-E-N-T-I-A-L San Francisco, California
6 October 1943.

SECOND ENDORSEMENT to
CO SEAL Conf. ltr. SS183/
W.P.R. #8/A16.

From: The Commander Submarine Squadron TWO.
To: The Commander Submarine Force, PACIFIC FLEET.

Subject: U. S. S. SEAL - Report of Eighth War Patrol,
Comments on.

1. Forwarded, concurring with the remarks in
the first endorsement.

2. The ingenuity and persistence of the personnel
in overcoming the difficulties resulting from water entering
via the conning tower hatch on a dive is commendable. A
detailed report of this casualty will be forwarded in separate
correspondence.

3. A bombardment of installations on Sakhalin
Island prior to departure might have caused considerable
and worthwhile damage.

P. E. PENDLETON.

— page 53 —
[HANDWRITTEN: 3ND Copy]
FF12-10/A16-3(8)/(16) SUBMARINE FORCE, PACIFIC FLEET A

Serial 01428 Care of Fleet Post Office,
San Francisco, California.
CONFIDENTIAL 9 October 1943 [STAMP: RECEIVED S C FILES]

THIRD ENDORSEMENT to [HANDWRITTEN: Room 2655]
SEAL Report of [HANDWRITTEN: 3 NOV 1943]
Eighth War Patrol. [HANDWRITTEN: ROUTE TO- 01-02]
[HANDWRITTEN: A16-3(23)/SS183-1]
COMSUESPAC PATROL REPORT NO. 271 [HANDWRITTEN: Op File No. 98510]
U.S.S. SEAL - EIGHTH WAR PATROL. [HANDWRITTEN: Doc. No]

From: The Commander Submarine Force, Pacific Fleet.
To : The Commander-in-Chief, United States Fleet. [HANDWRITTEN: Copy No. ....]
Via: The Commander-in-Chief, U. S. Pacific Fleet. [HANDWRITTEN: PRN 1903]

Subject: U.S.S. SEAL (SS183) - Report of Eighth War Patrol.
(15 August 1943 to 4 October 1943).

1. The eighth war patrol of the SEAL was conducted in the southern
part of the Sea of Okhotsk.

2. The patrol was handicapped early in area by a hatch casualty which
flooded the pump room decommissioning much auxiliary machinery, including both
high pressure air compressors, permanently.

3. Excellent ingenuity was shown by the ships force in preparing
jury rig equipment which successfully supplied sufficient air to allow the SEAL
to carry out the remainder of the patrol.

4. Only one contact suitable for torpedo attack was made, and this
attack resulted in misses.

5. This patrol is not considered successful for the purpose of
Combat Insignia Award.

C. A. LOCKWOOD, Jr.

DISTRIBUTION:
(Complete Reports)
Cominch (5) | CTF 72 (2)
VCNO (5) | CTF 16 (1)
Cincpac (6) | Comsubspac (18)
Intel.Cen.Pac. (1) | Subad, MI (2)
Ocean Areas (1) | Comsubcoms (2)
Comservpac | All Squad.
(Adv.Base Plan.Unit (1) | Comsubspac
Cinclant (2) | Comdrs, Sub.
Comsublant (8) | USS SEAL (1)
S/M School (2) | (Endorsements only)
Comsopac (2) | All Subs, Subspac (1)
Comsowespac (2)
ComsubsoWespac (2)

[SIGNATURE: J. A. WOODRUFF, Jr.,]
Flag Secretary.

— page 54 —
SS183/A16
WPR-9

DECLASSIFIED-ART. 0445, OPNAVINST 5510.10
BY [HANDWRITTEN: OPO/Stx] DATE [HANDWRITTEN: 8/15/72]

C O N [STAMP: DECLASSIFIED] N T I A L
Subject: U.S.S. SEAL - Report of Ninth War Patrol. Period
          4 October 1943 to 19 December 1943. Operating under
          ComSubPac Operation Order 261-43.

Prologue: On 4 October 1943 arrived Pearl Harbor from Eighth
          War Patrol. 5 - 31 October 1943, refit accomplished
          by SubDiv 21 Relief Crew and HOLLAND. 1 - 6 November
          1943, training and loading. 7 November 1943, ready
          for sea.

1. NARRATIVE

7 November 1943
1335 (WX) Underway from Submarine Base, Pearl Harbor.
1850 (WX) Escort departed.

8 November 1943
          Enroute Pearl Harbor to Johnston Island. Conducted
          dives and drills.

9 November 1943
1155 (X) Moored alongside PLUNGER at Johnston Island.

10 November 1943
0700 (X) Underway from Johnston Island.
          Conducted dives, drills and battle problems.

11-15 November 1943
          Enroute Johnston Island to area. Conducted daily
          dives and drills. No Contacts.

16 November 1943
0441 (L) Submerged.
1115 (L) Entered area at Lat 11-00 N. Long 167-57 E.
1816 (L) Surfaced.

17 November 1943
0443 (L) Submerged. Lat 9-37 N. Long 167-09 E.
1305 (L) Sighted Roi Island bearing 175°T. Sighted Medium
          bomber on same bearing.
1835 (L) Surfaced

[HANDWRITTEN: FILMED
63094]
(1) ENCLOSURE (A)

— page 55 —
SS183/A16
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C O N F I D E N T I A L
Subject: U.S.S. SEAL - Report of Nineth War Patrol.

18 November 1943
0437 (L) Submerged. Lat 8-52 N. Long 168-15 E.

1030 (L) Sighted land bearing 272°T. Landfall turned out to be
Omelok instead of Bigej as expected.

1820 (L) Surfaced.

19 November 1943
0200 (L) Radar contact on Kwajalein, 12000 yards, bearing 005°T.

0438 (L) Submerged.

0626 (L) Sighted land bearing 032°T.

0958 (L) Sighted patrol boat off Gea Pass.

1155 (L) Counted five merchant ships in Kwajalein anchorage.

1330 (L) Sighted medium bomber over Kwajalein headed south.

1835 (L) Surfaced.

20 November 1943
0439 (L) Submerged.

1306 (L) Sighted Enubij bearing 038°T.

1830 (L) Surfaced.

21 November 1943
0441 (L) Submerged.

0745 (L) Sighted land bearing 087°T, turned out to be Legan
instead of Gehh as expected.

0850 (L) Sighted medium bomber over Legan headed south.

1225 (L) Sighted formation of 6 medium bombers over atoll
headed south.

1830 (L) Surfaced.

2031 (L) Sighted searchlight beam, directed up, bearing 015°T,
the bearing of Roi Island.

2051 (L) Searchlight went out.

2100 (L) Searchlight came on again and remained on for a half
hour.

(2) ENCLOSURE (A).

— page 56 —
SS183/A16
WPR-9

C O N F I D E N T I A L
Subject : U.S.S. SEAL - Report of Ninth War Patrol.

22 November 1943
0458 (L) Submerged.
0512 (L) Surfaced to rub in #3 and #4 main engine exhaust valves
           which were leaking badly.
0523 (L) Submerged.
1500 (L) Sighted patrol boat bearing 038°T. Maneuvered to avoid.
1550 (L) Sighted 4 engine patrol plane over atoll heading south-
           east.
1832 (L) Surfaced.

23 November 1943
0444 (L) Submerged.
0848 (L) Sighted patrol boat bearing 322°T. Maneuvered to avoid.
1112 (L) Sighted Tone Class cruiser, with Hibicki destroyer on
           port bow, emerging from rain squall. Range 9000 yards,
           angle on bow 70° starboard, course 085°, speed 19 knots.
           Closest range attained 6200 yards.
           Ships stood in Goa Pass.
1203 (L) Sighted two patrol boats bearing 354°T., maneuvered to
           avoid.
1233 (L) Sighted patrol boat bearing 020°T., maneuvered to avoid.
1533 (L) Sighted medium bomber bearing 115° T. approaching atoll
           on northerly course.
1833 (L) Surfaced.
2205 (L) Headed for Truk-Roi traffic route.

24 November 1943
0600 (L) Submerged. Lat 9-49 N. Long 165-16 E.
1815 (L) Surfaced.

25 November 1943
0450 (L) Submerged. Lat 9-34 N. Long 165-45 E. Patrolling
           approach to Roi.
1834 (L) Surfaced.                               (3) ENCLOSURE (A)

— page 59 —
SS183/A16-
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C O N F I D E N T I A L

Subject: U.S.S. SEAL - Report of Ninth War Patrol.

1 December 1943
0452 (L) Submerged.
0953 (L) Sighted Gugogwe Island bearing 266°T.
1143 (L) Sighted seaplane bearing 200°T. headed north.
1230 (L) Began photographing shore line. Bigej to Loi.
1430 (L) Sighted small vessel crossing Bigej Channel on northerly
          course, inside lagoon.
1600 (L) Secured photography.
1635 (L) Sighted seaplane taking off from lagoon near Ebeye
          Island.
1858 (L) Surfaced.

2 December 1943
0445 (L) Submerged.
1100 (L) Began photography of shore line. Loi to Enubij.
1147 (L) Sighted small vessel crossing Bigej channel to north-
          ward inside lagoon.
1655 (L) While photographing Enubij Island sound reported
          screws.

          Sighted 2 cruisers (one Sendai, one Nagara Class)
          angle on the bow 90° starboard, range 8000 yards,
          course 300°T., speed 19 knots.

          A destroyer was later seen on their left flank. They
          eventually entered Gea Pass.

          During day sighted 9 AK's, 1 AO in lagoon.

1935 (L) Surfaced.

(6) ENCLOSURE (A).

— page 60 —
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C O N F I D E N T I A L
Subject: U.S.S. SEAL - Report of Ninth War Patrol.

3 December 1943
0452 (L) Submerged.
0905 (L) Sighted seaplane bearing 100°T., headed south.
0955 (L) Began photography of shore line. Eller to Ennumet.
1600 (L) Secured photography.
1836 (L) Surfaced.
2040 (L) Sent Serial Three to ComSubPac.

4 December 1943
Heading for station for lifeguard duty.
0122 (L) Radar contact bearing 164°T, range 9000 yards.
Turned south to close. Range opened rapidly to the
westward and contact was soon lost. Possibly a
destroyer making better than 20 knots.
0452 (L) Submerged. Lat 9-50 N. Long 167-22 E.
1530 (L) Sighted patrol plane bearing 090°T., headed southwest.
1837 (L) Surfaced.

5 December 1943
On station for lifeguard duty, 30 miles north of Roi
Island.
0656 (L) Heard first traffic on voice frequency, of our planes
going in for attack on shipping at Kwajalein.
0706 (L) Dove for plane contact.
0756 (L) Surfaced.
0759 (L) Following conversation heard on voice radio: "Two
cruisers badly damaged and several cargo ships down
by the stern at Kwajalein a tanker also exploded and
spread oil all over the water and is burning all over.
Several other ships are badly damaged. Small fire at
Roi." This was the last voice transmission heard.
0810 (L) Dove for formation of 5 medium bombers headed north.
0841 (L) Surfaced.
0925 (L) Dove for plane contact.
1020 (L) Surfaced.

(7) ENCLOSURE (A).

— page 61 —
SS183/A16
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C O N F I D E N T I A L
Subject : U.S.S. SEAL - Report of Nineth War Patrol.

5 December 1943 (Cont-)
1046 (L) Dove for plane contact.

1200 (L) Prepared to surface.

1215 (L) Sighted medium bomber, remained submerged.

1305 (L) Surfaced.

1459 (L) Dove for plane contact.

1558 (L) Surfaced.

2206 (L) Dove for plane contact; medium bomber with running
           lights passed down starboard side.

2300 (L) Surfaced.

2345 (L) Sent Serial Four to ComSubPac.

6 December 1943
0537 (L) Dove for plane contact. Lat 9-51 N. Long 167-11 E.

1840 (L) Surfaced.

7 December 1943
0303 (L) Sighted red light on Roi Island, bearing 230°T.

0330 (L) Sighted searchlight beam bearing 235°T.

0345 (L) Radar contact on land bearing 245°T, 21000 yards.
           Searchlight was elevated about 15° and swept through
           an arc of about 20°, sometimes crossing us.

0428 (L) Submerged.

           Had intended to take photographs of Roi but sea was
           too rough to maintain periscope depth.

1840 (L) Surfaced.

8 December 1943
0500 (L) Submerged.

1424 (L) Began taking photographs of shore line. Yabbenohr
           to Eru.
1632 (L) Secured photography.

1902 (L) Surfaced.

                                                      (8)           ENCLOSURE (A)

— page 63 —
SS183/A16
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C O N F I D E N T I A L

Subject : U.S.S. SEAL - Report of Ninth War Patrol.

2. WEATHER

During November the weather was generally overcast, with
frequent heavy rain squalls and reduced visibility.

During December the weather was generally clear, with
occasional rain squalls.

To the eastward of the atoll the seas were, in general,
moderate with white caps.

To the westward of the atoll the seas were light to mod-
erate. There was always some surface chop with some white caps.

3 TIDAL INFORMATION

On the western side of the atoll the currents were found
to vary with the tide.

West and north of Mann Island the current was found to
average about 330°, 0.7 knots, on the ebb, with the reverse on
the flood.

Southwest of Gea Pass the current averaged 300°, 0.6 knots
on the ebb, with the reverse on the flood.

On the eastern side of the atoll the current sets generally
northeast, 0.8 knots.

Close inshore near Namur Island a current of 2.6 knots,
setting northward parallel to the coast, was experienced.

A strong southerly current parallel to the coast was exper-
ienced off Bigej Island. Just south of Bigej Channel this cur-
rent changed rapidly to the west setting us dangerously close to
Gugegwe Island. This effect was observed on two successive days.

North of the atoll, and away from land influences the usual
current sets 300°, 0.7 knots.

4 NAVIGATIONAL AIDS

No navigational aids were sighted.

All piloting was done by means of tangents. These cut in
very well.

(10) ENCLOSURE (A).

— page 64 —
SS183/A16
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C O N F I D E N T I A L

Subject: U.S.S. SEAL - Report of Nineth War Patrol.

11 December 1943
0453 (L) Submerged.

0750 (L) Began photography of shore line. Gagan to Roi.

0833 (L) Sighted small vessel in lagoon approaching Edgigen
         Island.

0840 (L) Sighted vessel of PC type underway to northward
         inside lagoon.

1130 (L) Sighted patrol boat off North Pass.

         Secured photography.

1840 (L) Surfaced.

12 December 1943
0450 (L) Submerged.

         Proceeded to reconnoiter islands from Majatta to
         Ebadon Island.

1849 (L) Surfaced.

2229 (L) Sighted patrol boat, range between 7000 and 8000 yards.
         Appeared to be same type as seen inside lagoon on
         11 December. Bright moonlight, no radar contact.
         Vessel on steady course, speed 10 knots. Maneuvered
         to avoid and regained east-west line to North Pass.

13 December 1943
0455 (L) Submerged. Lat 9-24 N. Long 166-44 E.

         Patrolling approach to North Pass.

1850 (L) Surfaced.

14 December 1943
0447 (L) Submerged.

         Proceeded to reconnoiter islands from Biggeran to
         North Pass.

0747 (L) Sighted medium bomber headed toward Roi.

0905 (L) Sighted medium bomber headed for Roi.

(10a) ENCLOSURE (A).

— page 65 —
SS183/A16
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C O N F I D E N T I A L
Subject: U.S.S. SEAL - Report of Ninth War Patrol.

14 December 1943 (cont)
1050 (L) Sighted Medium bomber headed for Roi.

1436 (L) Sighted patrol boat off North Pass.

1527 (L) Sighted medium bomber headed for Roi.

1600 (L) Sighted medium bomber headed for Roi.

1616 (L) Sighted two medium bombers circling for landing on Roi.

1845 (L) Surfaced.

15 December 1943
0246 (L) Sighted Gellinan Island bearing 262°T.

0448 (L) Submerged.

Proceeding for observation of Kwajalein anchorage.

0601 (L) Sighted patrol boat dead astern with zero angle on the
bow.

0618 (L) Sound picked up screws of patrol boat.

0644 (L) Patrol boat stopped screws and began pinging.

Retired to the northward.

0730 (L) Heard last pings.

Decided to take a look at Gellinan Island. Unusual
position of patrol boat contact suggested that we may
have been tracked by radar on Meck, Kwadack or Gellinan.

1710 (L) Sighted transport plane bearing 300°T., on north-
easterly heading.

1846 (L) Surfaced.

2233 (L) Received dispatch orders from ComSubPac to return to
Midway.

16 December 1943
0420 (L) Departed area.
2340 (L) Sent Serial Six to ComSubPac.

(10b) ENCLOSURE (A)

— page 66 —
SS183/A16
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C O N F I D E N T I A L

Subject: U.S.S. SEAL - Report of Ninth War Patrol.

17 December 1943
1319 (Y) Dove for plane contact. Lat 17-10 N. Long 173-28 E.
1532 (Y) Surfaced.

19 December 1943
1006 (Y) Arrived Midway.

(10c) ENCLOSURE (A)

— page 68 —
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C O N F I D E N T I A L

Subject: U.S.S. SEAL - Report of Nineth War Patrol.
         -------

17 December 1943
1319 (Y) Dove for plane contact. Lat 17-10 N. Long 173-28 E.
1532 (Y) Surfaced.

19 December 1943
1006 (Y) Arrived Midway.

(10c)                               ENCLOSURE (A)

— page 69 —
SS183/A16
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C O N F I D E N T I A L
Subject: U.S.S. SE_L - Report of Ninth War Patrol. - - - - - - -

5. DESCRIPTION OF SHIPS SIGHTED

No | Time (LCT)
   | Date
---|
1. | 1112
   | 11-23
---|
2. | 1525
   | 11-26
---|
3. | 0837
   | 11-27
---|
4. | 1655
   | 12-2

Position          | Course | Speed | Description
||-------|
5 miles west of   | 085    | 19    | 1 Tone Class
Gea Pass          |        |       | Cruiser,
                  |        |       | 1 Hibiki Class
                  |        |       | destroyer
||-------|
9-30 N.           | 090    | 20    | Destroyer
166-52 E.         |        |       |
||-------|
19 miles south of | 025    | 16    | Submarine
Gea Pass          |        |       | 1 Sendai Class
                  |        |       | Cruiser,
                  |        |       | 1 Nagara Class
                  |        |       | Cruiser,
                  |        |       | 1 Destroyer.
||-------|
5 miles south-    | 300    | 19    | 1 Destroyer.
west of Enubw     |        |       |

A total of 19 patrol boats were sighted, 12 in the
vicinity of Gea Pass, 5 in the vicinity of or on approaches
to North Pass, and 1 to the northeastward of Kwajalein Island.

(11) ENCLOSURE (A)

— page 70 —
SS183/ A16
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C O N F I D E N T I A L

Subject : U.S.S. SEAL - Report of Ninth War Patrol.

6. AIRCRAFT SIGHTED
No. | Time (LCT) | Date | Position | Description
----||------||
1. | 1305 | 11-17 | Roi | Nell
2. | 1330 | 11-19 | Kwajalein | Nell
3. | 0850 | 11-21 | Legan | Nell
4. | 1225 | 11-21 | over atoll | 6 Nell
5. | 1550 | 11-22 | over atoll | Mavis
6. | 1533 | 11-23 | over atoll | Nell
7. | 1245 | 11-26 | over atoll | Mavis
8. | 1547 | 11-29 | Kwajalein | Mavis
9. | 1215 | 11-30 | Kwajalein | Nell
10. | 1532 | 11-30 | Kwajalein | Nell
11. | 1145 | 12-1 | Kwajalein | Rufe
12. | 1635 | 12-1 | near Eboye | Rufe taking off
13. | 0938 | 12-3 | over atoll | Rufe
14. | 1530 | 12-4 | north of Roi | Mavis
15. | 0706 | 12-5 | 30 miles north of Roi | unidentified
16. | 0810 | 12-5 | 30 miles north of Roi | 5 Nell
17. | 0925 | 12-5 | 30 miles north of Roi | unidentified
18. | 1046 | 12-5 | 30 miles north of Roi | unidentified
19. | 1210 | 12-5 | 30 miles north of Roi | Nell
20. | 1459 | 12-5 | 30 miles north of Roi | Nell
21. | 2206 | 12-5 | West of Roi | Nell
22. | 0536 | 12-6 | 30 miles north of Roi | unidentified.
(12) ENCLOSURE (A)

— page 71 —
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C O N F I D E N T I A L
Subject : U.S.S. SEAL - Report of Nineth War Patrol
6. Aircraft Sighted (cont-)

No | Time (LCT) | Date | Position | Description
---||------||
23.| 0747       | 12-14| Roi      | Nell
24.| 0905       | 12-14| Roi      | Nell
25.| 1050       | 12-14| Roi      | Nell
26.| 1527       | 12-14| Roi      | Nell
27.| 1600       | 12-14| Roi      | Nell
28.| 1616       | 12-14| Roi      | 2 Nell
29.| 1710       | 12-15| Gellinam | Tess
30.| 1319       | 12-17| 7-10 N   | unidentified
   |            |      | 173-28 E |

(12a) ENCLOSURE (A)

— page 72 —
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C O N F I D E N T I A L
Subject : U.S.S. SEAL - Report of Ninth War Patrol. - - - - - - -

7. SUMMARY OF SUBMARINE ATTACKS
No attacks were made.

8. ANTI-SUBMARINE MEASURES
A continuous daylight patrol of at least one vessel is
apparently maintained off both Gea Pass and North Pass.

The number of patrol vessels is increased and their dis-
tance to seaward extended when traffic is expected.

On several occasions these patrols were passed at ranges
between 2000 and 4000 yards and on only one occasion did the
vessel resort to echo-ranging.

9. ENEMY MINE SWEEPING OPERATIONS
None observed.

10. MAJOR DEFECTS
1. Engineering
Considerable difficulty was experienced with leaky main
engine outboard exhaust valves. There was hardly a day of the
patrol when all outboard valves were holding. The leaks were
kept low only by frequent rubbing in and by making running
dives to give time for knocking carbon off the valve seats.

The inboard valves cannot be relied upon to stop the water
when the outboard valves do not hold.

2. Ordnance
The torpedo data computer continues to give trouble.
Frequently, when started, the range generates down to zero
without stopping. Occasionally when a change in bearing is
set in the bearing generates back to the original setting.

(13) ENCLOSURE (A)

— page 73 —
SS183/A16
WPR-9
C O N F I D E N T I A L
Subject : U.S.S. SEAL - Report of Nineth War Patrol.
11. RADIO RECEPTION

Reception on 16.68 Kcs. was unsatisfactory at all times
while on station, due to high noise level.

Reception on 4525 Kcs. was generally good at night. Some
Jap interference was encountered on this frequency.

14390 Kcs. was the best frequency for reception in the
daytime while on the surface in the area.

The little voice traffic which was heard on 6835 Kcs.
came in very well.

The submerged loop continues to be ineffective for distance
over 100 miles.

All transmissions on 4235 Kcs. were gotten off with little
difficulty, although some Jap interference was encountered.

SJ Radar

During the refit period a new type transmitter was installed.
The installation gave excellent results during the training
period.

During the patrol some frequency instability was experienced
and the automatic frequency control was not reliable. The set
was tuned on land targets when available. There was no tuning
meter on board.

In general, the performance was considered good.

SD Radar

Enroute to and from station the SD radar was keyed on for
5 seconds out of each 30 seconds, which procedure appeared to
be satisfactory.

While on the surface in the area the SD was not used.

Some interference was noted from electric fans.

(14)

ENCLOSURE (A).

— page 74 —
SS183/A16
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C O N F I D E N T I A L

Subject : U.S.S. SEAL - Report of Ninth War Patrol.

12. SOUND CONDITIONS AND DENSITY LAYERS

    1. Sound conditions were, in general, excellent.

    2. No density layers were encountered. The bathythermograph
    trace was a vertical line from the surface to 200 feet all around
    the atoll.

13. HEALTH AND HABITABILITY

    In general excellent

    One new mess attendant suffered from chronic seasickness.

    One case of an infected hand and the usual minor aches and
    constipation were handled efficiently by the pharmacist's mate.

14 & 15. MILES AND FUEL

| | MILES | FUEL |
|---|---|---|
| Pearl to area - - - - - - - | 2135 | 22532 |
| On station| 3688 | 24112 |
| Area to Midway- - - - - - - | 1410 | 21280 |
| TOTALS | 7233 | 67924 |

16. FACTORS OF ENDURANCE REMAINING

| Torpedoes | Fuel | Provisions | Water | Personnel |
|---|---|---|---|---|
| 20 | 33893 | 20 days | Unlimited | 10 days |

17. FACTOR CAUSING END OF PATROL

    Dispatch orders from ComSubPac terminated patrol one day
    earlier than provisions of operation order.

18. REMARKS

    A total of nine days was spent on photographic reconnais-
    sance work. 60 usable rolls of film were taken.

    On 23 and 27 November, maneuvers to avoid patrol craft
    prior to contacts probably prevented us from being in favorable
    attack positions on those occasions. However, in the latter
    case, the enemy would probably have been sighted in time for an
    attack if the weather had been clear.

- 15 - ENCLOSURE (A)

— page 75 —
SUBMARINE DIVISION FORTY-FIVE fk
Care of Fleet Post Office,
San Francisco, California,
22 December 1943.

FB5--45/A16-3
Serial 0100(B)

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

FIRST ENDORSEMENT to
USS SEAL Conf. Ltr. SS183/
A16-3 of 20 December 1943.

From: The Commander
To : The Commander-in-Chief, United States Fleet.
Via : (1) Commander Submarine Force, Pacific Fleet.
(2) Commander Subordinate Command.
(3) Commander-in-Chief, United States Pacific Fleet.

Subject: U.S.S. SEAL - Report of War Patrol Number Nine.

1. SEAL ninth war patrol covered a period of forty-
two days. One month was spent in area around KWAJALEIN ATOLL
observing enemy movements, photographic reconnaissance, life-
guard duty and offensive patrol.

2. The assigned area was well covered and required re-
connaissance made close to the shore line. Four important con-
tact reports were sent. Two contacts were made with escorted
enemy cruisers headed for GOA PASS but could not close to fir-
ing position. A destroyer was seen but could not be closed to
less than 8000 yards and contact was lost with a submarine
which disappeared in a rain squall at 4500 yards. Thirty enemy
aircraft contacts were made and nineteen patrol boats were ob-
served at different times.

3. The nine days spent on photographic reconnaissance
required careful and accurate navigation as well as skillful
ship handling to prevent observation and subsequent attack.

4. SEAL arrived from patrol in very good material con-
dition indicating that ship personnel keep material in above
average state of repair during patrol. Refit will be accom-
plished in the normal period.

J. A. CONNOLLY.

— page 76 —
A16-3
Serial 0183
CONFIDENTIAL

SECOND ENDORSEMENT to
USS SEAL Conf. Ltr. SS183/
A16-3 of 20 Dec. 1943.

From: The Commander Submarine Force, Pacific Fleet,
Subordinate Command.
To : The Commander Submarine Force, Pacific Fleet.
Subject: U.S.S. SEAL - Report of War Patrol Number Nine.

1. Forwarded, concurring in the remarks of the
Commander Submarine Division FORTY-FIVE.

2. The photographic reconnaissance was carefully
done and the photographs taken should be of great value.

J. P. LONGSTAFF.

Copy to:
Comsubdiv 45
CO, USS SEAL
COMMANDER SUBMARINE FORCE, PACIFIC FLEET,
SUBORDINATE COMMAND, NAVY NO. 1504.

c/o Fleet Post Office,
San Francisco, Calif.
24 December 1943.

— page 77 —
FF12-10/416-3(8)/(16) SUBMARINE FORCE, PACIFIC FLEET
Serial 01984

CONFIDENTIAL

THIRD ENDORSEMENT to
SEAL Report of
Ninth War Patrol.

COMSUBSPAC PATROL REPORT NO. 227
U.S.S. SEAL - 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. SEAL (SS183) - Report of Ninth War Patrol.
(7 November to 19 December 1943).

1. The SEAL's ninth war patrol was spent in the Marshall Islands.
The major mission of this war patrol was photographic reconnaissance of impor-
tant bases in the Marshalls.

2. The SEAL conducted excellent photographic reconnaissance of the
islands assigned, and in addition was able to furnish important information on
shipping at Kwajalein during the Gilbert Islands operations which was most
beneficial to the subsequent air strike at Kwajalein.

3. Bad weather was instrumental in depriving the SEAL of a chance
to fire torpedoes at the surface contacts made.

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

5. The Commander Submarine Force, Pacific Fleet, congratulates the
Commanding Officer, officers, and crew for the successful performance of this
arduous photographic mission.

DISTRIBUTION:
(Complete Reports)
Cominch (5)
CNO (5)
Cincpac (6)
Intel. Cen. Pac.
Ocean Areas (1)
Comservpac
(Adv. Base Plon.Unit (1)
Cinclant (2)
Comsubslent (2)
S/M School, NL (2)
Comsopac (2)
Comsowespac (1)
Comsubsowespac (2)
CTF 72 (2)
Comnorpac (1)
Comsubspac (20)

Care of Fleet Post Office,
San Francisco, California,
27 December, 1943.

NOTE: THIS REPORT WILL BE DESTROYED
PRIOR TO ENTERING PATROL AREA.

[HANDWRITTEN: C. A. LOCKWOOD, Jr.]

[STAMP: APPROVED]
[STAMP: RECEIVED]
[STAMP: 18 JAN 1944]
[STAMP: 10-12 then 0]
[STAMP: A16-3(8)]
[STAMP: 106254]
[STAMP: 3 3]
[STAMP: 25754]

SUBBID, WI (2)
ComsubspacSubordcom (3)
All Squadron and Div.
Commanders, Subspac (2)
Comsubstrainpac (2)
All Submarines, Subspac (1)

[SIGNATURE: J. A. Woodruff, Jr.]
J. A. WOODRUFF, Jr.,
Flag Secretary. [HANDWRITTEN: C.A.L.]

— page 78 —
DECLASSIFIED [STAMP: ART. 0445, OPNAVINS 5510.1C]
U.S.S. SEAL (SS183) BY [HANDWRITTEN: 0P09B1K] DATE [HANDWRITTEN: 6/15/77]
SS183/A16
WPR-10
care of Fleet Post Office
San Francisco, Calif.

From: The Commanding Officer.
To : The Commander Submarine Force Pacific Fleet.
Via : The Commander Submarine Division FORTY-FOUR.
The Commander Submarine Squadron FOUR.

Subject: Report of Tenth War Patrol.

Enclosure: (a) Subject report.

1. The subject report is forwarded herewith.

2. The tenth war patrol covered a period of 50
days, 29 of which were spent in the vicinity of Ponape Island.
A photographic reconnaissance was made of Ponape Island.

H.B. DODGE.

68241 [STAMP: FILMED]

— page 79 —
SS183/A16
WPR-10
[STAMP: DECLASSIFIED]
CONFIDENTIAL
Subject: U.S.S. SEAL - Report of Tenth War Patrol. Period
           19 December, 1943 to 6 March 1944. Operating under
           ComSubPac Operation Order 29-44.

Prologue: On 19 December, 1943, arrived Midway from Ninth
           War Patrol. 20 December, 1943 to 1 January 1944,
           refit accomplished by SubDiv 45 relief crew and
           Sub Base Midway. 2-7 January, 1944 enroute Mid-
           way to Pearl Harbor with Lieutenant Robert J.
           Durvea, U.S. Navy, Commanding. 8-10 January, 1944,
           docked in AFD-1 at Pearl Harbor for renewal of
           port propeller. 12-16 January, 1944, training
           and loading. 17 January, 1944, ready for sea.

A. NARRATIVE

17 January 1944
1810 (VW) Underway from Submarine Base, Pearl Harbor. In
           company with Spearfish and escort.
1932 (VW) Escort departed.

18 January 1944
           Enroute Pearl Harbor to Johnston Island. Conducted
           dives and drills.

19 January 1944
0725 (I) Joined by air escort.
1004 (I) Moored alongside Searaven at Johnston Island.
1733 (I) Underway from Johnston Island for Patrol area.

20-22 January 1944
           Enroute Johnston Island to patrol area. Conducted
           daily dives and drills.

23 January 1944
1122 (T) Sighted plane bearing 220°(T), distance 5 miles.
           Lat 14-53 N. Long 175-06 E. Submerged.
1210 (T) Surfaced.

24-25 January 1944
           Enroute to area conducting daily dives and drills.

26 January 1944
0000 (L) Lat 10-55(N) Long. 160-34 E.
0055 (L) Changed course to 230°T. to run down Eniwetok -
           Truk line.

-1- ENCLOSURE (A)
[HANDWRITTEN: 2]

— page 80 —
26 January 1944 (con't)
0600 (L) Received Shipjack contact report of convoy headed
for Eniwetok. Conducted surface patrol along and
across probable track.

1355 (L) Sighted single-float seaplane on port beam on
parallel course distance 2 miles. Lat. 9-55 N.
Long 158-43 E. Submerged.

1357 (L) Two bomb explosions.

1808 (L) Heard two distant explosions.

1810 (L) Heard one distant explosion.

1815 (L) Heard four distant explosions. Explosion appeared
to be to westward of us and so were led to believe
that we might still be between convoy and Eniwetok.

1900 (L) Surfaced. Set course toward Eniwetok.

27 January 1944
0000 (L) Lat 10-16 N. Lon 159-17 E. Reversed course.

0111 (L) Abandoned search for convoy and set course for
Ponape.

0620 (L) Submerged.

1825 (L) Surfaced.

28 January 1944
0517 (L) Made radar contact on Ponape Island bearing 177°T.
range 60000 yards.

0430 (L) Submerged.

0520 (L) Sighted Ponape bearing 180°T.

0940 (L) Sighted two small freighters in Ponape Harbor.

1007 (L) Sighted patrol boat of Sampan type, bearing 160°T.
avoided.

1158 (L) Sound reported screws bearing 168°T. Sighted same
patrol boat as before, patrolling harbor entrance.
Avoided.

1234 (L) Sound reported screws bearing 325°T. Sighted
patrol vessel, having basket type lookout platform
on foremast, headed for harbor entrance. Maneuvered
to avoid.

-2- ENCLOSURE (A)
[HANDWRITTEN: 3]

— page 81 —
28 January 1944 (con't)
1312 (L) Sighted two-engine medium bombing plane bearing
149°T. on easterly course.

1427 (L) Heard distant explosion. Nothing in sight.

1429 (L) Heard second distant explosion.

1850 (L) Surfaced.

29 January 1944
0439 (L) Submerged.

0755 (L) Began taking photographs of eastern side of Ponape
Island.

1407 (L) Secured photography because of poor visibility
and rain over island.

1850 (L) Surfaced.

30 January 1944
0441 (L) Submerged.

0829 (L) Began taking photographs of southeastern side of
Ponape Island.

1503 (L) Secured Photography.

1902 (L) Surfaced.

31 January 1944
0441 (L) Submerged.

1119 (L) Began taking photographs of southern and western
sides of Ponape.

1540 (L) Secured photography.

1852 (L) Surfaced.

1 February 1944
0444 (L) Submerged. Weather overcast with frequent rain
squalls. Visibility too poor for photography.
Patrolling off harbor entrance.

0840 (L) Sound reported pinging.

0845 (L) Sighted sampan type patrol boat. He was alternately
going ahead and listening. He would go ahead
while pinging and stop when listening. Maneuvered
to avoid.

-3- ENCLOSURE (A)
[HANDWRITTEN: 4]

— page 82 —
1 February 1944 (con't)
1858 (L) Surfaced.

1902 (L) #2 main engine out of commission with a bent
piston rod.

2 February 1944
0445 (L) Submerged. Patrolling to eastward of Ponape on
main line. Effecting repairs to #2
main engine. Visibility too poor for photography.

1845 (L) Surfaced.

2103 (L) Repairs to #2 main engine completed.

3 February 1944
0442 (L) Submerged. Patrolling northwestward of Ponape.
Weather made photography impossible.

1850 (L) Surfaced.

4 February 1944
0446 (L) Submerged. Patrolling to northwestward of Ponape
Harbor entrance. Photography impossible on account
of weather.

5 February 1944
0504 (L) Submerged.

0730 (L) Surfaced. Patrolling lifeguard station 50 miles
south of Tolocolne Peak.

1417 (L) Submerged. Mission postponed.

1847 (L) Surfaced.

6 February 1944
0514 (L) Submerged.

0740 (L) Surfaced. On lifeguard station, 50 miles south of
Tolocolne Peak.

0745 (L) Sighted unidentified, single-engine plane. Sub-
merged.

0812 (L) Surfaced.

1405 (L) Submerged. Mission postponed.

1847 (L) Surfaced.

-4- ENCLOSURE (A)
5

— page 83 —
7 February 1944
0458 (L) Submerged.
0743 (L) Surfaced. Patrolling lifeguard station 50 miles
south of Tolocolme Peak.
1400 (L) Submerged.
1855 (L) Surfaced.

8 February 1944
0445 (L) Submerged. Approaching Ponape from southward in
order to complete photography of island.
1055 (L) Sighted sampan bearing 000°T, headed to southward.
Avoided.
1203 (L) Sighted auxiliary sailing craft bearing 207°T.
headed for Ponape.
1248 (L) Took two rolls of pictures before visibility became
too poor for photography; decided to reconnoiter
Ant Atoll.
1555 (L) Sighted sampan entering Ant Island boat channel.
1847 (L) Surfaced.

9 February 1944
0444 (L) Submerged. Approaching Ponape from northeastward
in order to complete photography of island. No
pictures on account of poor visibility. Masts
of two ships were seen in Ponape Harbor.
1848 (L) Surfaced.

10 February 1944
0438 (L) Submerged. Approaching Ponape from northward in
order to complete photography of island. Both
cameras broke down. Took one roll of
pictures with 35 mm camera. Rain and low visibility
precluded further photography. Two ships still at
anchor in Ponape Harbor.
1850 (L) Surfaced.

11 February 1944
0442 (L) Submerged. Approaching Ponape from northward.
Visibility poor over island, patrolled to north
westward of harbor entrance.
1849 (L) Surfaced.

-5- ENCLOSURE (A)
[HANDWRITTEN: 6]

— page 84 —
12 February 1944
0461 (L) Submerged.

1142 (L) Surfaced on lifeguard station 25 miles east of
Tolocolme Peak.

1451 (L) Sighted unidentified plane bearing 135°T. Submerged.

1452 (L) Surfaced.

1605 (L) Sighted unidentified plane bearing 290°T. Submerged.

1626 (L) Surfaced.

13 February 1944
0440 (L) Submerged. Proceeded to reconnoiter Pakin Atoll.

0940 (L) Began photographing Pakin Atoll.

1027 (L) Completed Photography.

1852 (L) Surfaced.

14 February 1944
0444 (L) Submerged. Approaching Ponape from westward.

1044 (L) Took one roll of pictures and the camera, which
had been repaired, broke down permanently.

1531 (L) Sighted small vessel bearing 359°T. on course
110°T. Identified as a mine sweeper.

1545 (L) Vessel changed course to 150°T, which headed him
for the harbor entrance.

1625 (L) Lost contact.

1848 (L) Surfaced.

15 February 1944
0444 (L) Submerged.

0840 (L) Surfaced on lifeguard station, 25 miles east of
Tolocolme Peak.

1037 (L) Heard announcement of end of raid over voice radio.
No results were observed.

1124 (L) Submerged.

1847 (L) Surfaced.

-6- ENCLOSURE (A)
[HANDWRITTEN: 7]

— page 85 —
16 February 1944
0444 (L) Submerged. Patrolling to northwestward of Harbor
entrance.
1845 (L) Surfaced. Proceeded to Catchpole station.

17 February 1944
Patrolling lifeguard station, 30 miles south of
Tolocolme Peak.
1511 (L) Sighted unidentified plane. Submerged.
1800 (L) Surfaced.

18 February 1944
0450 (L) Submerged.
0857 (L) Surfaced on lifeguard station 30 miles east of
Tolocolme Peak.
0958 (L) Sighted two planes, submerged. Planes identified
as Liberators on easterly course.
1005 (L) Surfaced.
1008 (L) Sighted unidentified plane, definitely not a Libera-
tor, heading toward us. Submerged.
1034 (L) Surfaced.
1119 (L) Submerged.
1842 (L) Surfaced.

19 February 1944
Conducting surface patrol of lifeguard station, 30
miles south of Tolocolme Peak.
0856 (L) Sighted unidentified plane on northerly course.
Submerged.
0955 (L) Surfaced.

20 February 1944
Conducting surface patrol of lifeguard station,
30 miles south of Tolocolme Peak.

21 February 1944
0511 (L) Made trial dive.
0602 (L) Surfaced.
Conducted surface patrol of lifeguard station, 30
miles south of Tolocolme Peak.
-7- ENCLOSURE (A)
[HANDWRITTEN: 8]

— page 86 —
22 February 1944
0455 (L) Submerged. Approaching Ponape from westward, to
complete photographic reconnaissance.

0945 (L) Sighted smoke on airfield south of Jokaj, and
a heavy pall of smoke over Ponape town.

1030 (L) Began photography. After three rolls of film the
35 mm. camera broke down leaving only the motion
picture camera with which to complete the recon-
naissance.

1055 (L) Sighted two small craft in Ponape Harbor.

1505 (L) Completed photographic reconnaissance. Heavy clouds
of smoke were visible over Ponape all day. Smoke
was also seen on airfield south of Jokaj and at
seaplane base on Langar Island. The hangars at
the latter two places were definitely not burning.
No shipping was in sight in Ponape Harbor other
than the two small craft mentioned previously.

1845 (L) Surfaced.

23 February 1944
0455 (L) Submerged. Patrolling to northwestward of Ponape
Harbor entrance.

1407 (L) Sighted flying boat, bearing 090°T. on north-
westerly course.

1840 (L) Surfaced.

24 February 1944
0445 (L) Submerged. Patrolling to northwestward of Ponape
Harbor entrance.

1850 (L) Surfaced.

25 February 1944
0005 (L) Started transmitting serial one.

0445 (L) Submerged. Patrolling to northwestward of Ponape
Harbor entrance.

1837 (L) Surfaced.

2230 (L) Headed for Pearl Harbor.

26 February 1944
0450 (L) Submerged.
1852 (L) Surfaced.

-8- ENCLOSURE (A)
[HANDWRITTEN: 9]

— page 87 —
27 February 1944
     Enroute Pearl Harbor.
1500 (L) Sighted patrol plane, bearing 100°T. on westerly
     course. Submerged. Lat 15-38 N. Long 158-09 E.
1535 (L) Surfaced.

28 February 1944
     Enroute Pearl Harbor.
0700 (M) Sighted unidentified plane. Submerged. Lat 14-38N.
     Long 162-09 E.
0740 (M) Surfaced.
0855 (M) Submerged for S.D. radar contact, 6 miles. Lat 14-
     44 N. Long 162-10 E.
0910 (M) Surfaced.
1056 (M) Dove for plane contact. Lat 14-48 N. Long 162-09 E.
1125 (M) Surfaced.
1315 (M) Sighted two scout planes. Submerged. Lat 14-53 N.
     Long 163-08 E.
1648 (M) Surfaced.

29 February 1944
1145 (M) Dove for plane contact. Lat. 16-08 N. Long 168-08 E.
1219 (M) Surfaced.
1240 (M) Dove for plane contact. Lat 16-09 N. Long 168-14 E.
1407 (M) Surfaced.

1 - 5 March 1944
     Enroute Pearl Harbor.

6 March 1944
0643 (M) Rendezvous with escort.
1107 (M) Moored at Submarine Base, Pearl Harbor.

-9- ENCLOSURE (A)

[HANDWRITTEN: 10]

— page 88 —
B. Weather

          Over the island of Ponape the weather was nine-tenths cloudy,
with daily rain squalls. Away from the immediate vicinity of
land the weather was partially cloudy with occasional rain. The
prevailing wind was from 060°, force four. Seas were moderate
with some white caps at all times.

C. Tidal Information

          Close to the reef at Ponape the currents were, in general,
negligible. At one place, 1.5 miles south of Mutok Harbor a
northerly current of 1.5 knots was experienced.

          Away from the influence of land the current was generally
northeasterly, 0.3 knots.

D. Navigational Aids

          Ponape Light was in position shown on chart. It was not
lighted.

          Piloting in close to Ponape was by tangents and prominent
land marks.

          H.O. chart no. 0425 was found to be accurate.

E. Description of Ships Sighted

          No ship contacts were made. A total of seven small craft
were sighted in the vicinity of Ponape.

                                        -10-                    ENCLOSURE (A)

[HANDWRITTEN: 11]

— page 90 —
C. Summary of Attacks
No attacks were made.

H. Antisubmarine Measures

One patrol boat encountered off Ponape Harbor entrance
was using echo-ranging. He was apparently alternately listening
and echo-ranging, stopping while listening and going ahead while
echo-ranging.

While enroute to area we were sighted on the surface by a
Scout plane. He dropped two bombs which exploded as we were
passing 100 feet. No damage resulted.

I. Enemy Mine-Sweeping Operations.

None observed.

J. Major Defects.

Main engine outboard exhaust valves continued to leak
dangerously on this patrol. The inboard valves also leak and
water was taken into the engines several times as a result.

Ground readings on no. 2 and 5 main motors are 150,000
and 75,000 ohms, respectively.

Navy yard work requests have been made to cover all known
deficiencies and they should be corrected during the forth-
coming overhaul.

-12- ENCLOSURE (A)
[HANDWRITTEN: 13]

— page 91 —
H. Radio Reception

The following is a table of observations made in the vicin-
ity of Ponape.

Frequency | Time (CCT) | Signal Strength | Interference
|||
16.68 KC  | 0100       | Good            | Little Interference
          | 0900       | Unreadable      | Very Bad Interference
          | 1200       | Good            | Little Interference
          | 2000       | Unreadable      | Very Bad Interference
          |            |                 |
56 KC     | 0100       | Good            | Little Interference
          | 0900       | Unreadable      | Very Bad Interference
          | 1200       | Good            | Little Interference
          | 2000       | Unreadable      | Very Bad Interference
          |            |                 |
4525 KC   | 0900       | Excellent       | Little Interference
          | 1200       | Excellent       | Little Interference
          | 2000       | Fair            | Very Bad Interference
          |            |                 |
6300 KC   | 0900       | Fair            | Little Interference
          | 1200       | Good            | Little Interference
          | 2000       | Fair            | Little Interference
          |            |                 |
9090 KC   | 0100       | Bad             | Very Bad Interference
          | 0900       | Good            | Little Interference
          | 1200       | Excellent       | Little Interference
          | 2000       | Fair            | Very Bad Interference
          |            |                 |
14590 KC  | 0200       | Excellent       | Little Interference
          | 0800       | Fair            | Fair Interference
          | 2000       | Fair            | Fair Interference
          |            |                 |
17570 KC  | 0200       | Excellent       | Little Interference
          | 0600       | Good            | Fair Interference
          | 2200       | Excellent       | Fair Interference

-15-                                        ENCLOSURE (A)

[HANDWRITTEN: 14]

— page 92 —
L. Radar
The performance of the S.J. radar was Excellent. Land
contacts were obtained consistently at ranges of 65,000 yards.
No ship contacts were made.

Enroute to and from station the S.D. radar was keyed on
for 5 seconds out of each 50 seconds, which procedure appeared
to be satisfactory. While on the surface in the area the S.D.
was not used.

1. Sound Conditions and Density Layers.

Sound conditions were good. Screws of small craft were
picked up at ranges of 2,000 - 5,000 yards.

No density layers were encountered. The bathythermograph
trace was vertical to a depth of 200 feet throughout the area.

M. Health and Habitability
In general excellent.

O & P Miles and Fuel
| | Miles | Fuel |
|---|---|---|
| Pearl to Johnston | 730 | 10835 |
| Johnston to Area | 2120 | 25800 |
| On station | 2925 | 25071 |
| Area to Pearl | 2950 | 34815 |
| Totals | 8725 | 92621 |

2. Factors of Endurance Remaining
| Torpedoes | Fuel | Provisions | Water | Personnel |
|---|---|---|---|---|
| 20 | | 20 days | Unlimited | 14 days |

R. Factor Causing End of Patrol
Provisions on order.

S. Remarks
A photographic reconnaissance was made of Ponape Island.
73 rolls of still and 20 rolls of motion pictures were made.
Nine days were spent on lifeguard station.

-14-
ENCLOSURE (A)
[HANDWRITTEN: 15]

— page 93 —
FB5-44/A16-3

Serial 016

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

FIRST ENDORSEMENT to
USS SEAL Tenth War
Patrol Report

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

Subject: U.S.S. SEAL Tenth War Patrol - Comments on.

1. The tenth war patrol for the SEAL was Commander Dodge's fifth
war patrol as commanding officer. This war patrol covered a period of forty-
nine days of which thirty-four days were spent in area.

2. The SEAL was sent on a special mission which she accomplished
successfully. No ship worthy of attack was sighted.

3. The health and morale of the crew on arrival were excellent.

4. The material condition of the ship was very good. The SEAL
is due for navy yard overhaul. The SEAL will be re-engined during her navy
yard overhaul. Since these engines will not be ready for several months, the
SEAL will be given necessary repairs by Submarine Base, and be used for train-
ing purposes in Hawaiian Area during the short period of waiting to go to the
navy yard.

5. The commanding officer, officers and crew are to be congratulated
on the successful completion of this trying mission.

L. N. BLAIR.

[HANDWRITTEN: 16]
SUBMARINE DIVISION FORTY-FOUR

c/o Fleet Post Office
San Francisco, Califonia
7 March, 1944

— page 94 —
SUBMARINE SQUADRON FOUR
11/tel
Fleet Post Office,
San Francisco, California.
10 March 1934.

FC5-4/A16-3

Serial 071

CONFIDENTIAL

SECOND ENDORSEMENT to:
USS SEAL Tenth War
Patrol Report.

From: The Commander Submarine Squadron FOUR.
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. SEAL Tenth War Patrol - comments on.

1. Forwarded, concurring in the remarks of Commander
Submarine Division FORTY-FOUR.

C. E. HOMSEN.

3 02668
17

— page 95 —
FF12-10/A16-3(15)/(12) SUBMARINE FORCE, PACIFIC FLEET hch [HANDWRITTEN: F4253/2]
Serial 0477
Care of Fleet Post Office 84
San Francisco, California,
CONFIDENTIAL 11 March 1944. 3 02668

THIRD ENDORSEMENT to NOTE: THIS REPORT WILL BE
SEAL Report of DESTROYED PRIOR TO
Tenth War Patrol. ENTERING PATROL AREA.

COMSUBSPAC PATROL REPORT NO. 384
U.S.S. SEAL - 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. SEAL (SS183) - Report of Tenth War Patrol.
(17 January to 6 March 1944).

1. The tenth war patrol of the SEAL was conducted off Ponape Island.
The mission was photographic reconnaissance of Ponape and lifeguard services for
friendly air attacks.

2. For the second patrol in succession, the SEAL carried out this
difficult and arduous mission successfully. No contacts were sighted, and thus
no attacks were made.

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 the successful accomplishment of their
mission.

DISTRIBUTION: J. H. BROWN, Jr. [HANDWRITTEN: Recorded]
(Complete Reports)
Cominch (5)
CNO (5)
Cincpac (6)
Intel. Cen.Pac.Ocean Areas (1)
Comservpac (1)
(Adv.Base Plan.Unit) (3)
Cinclant (2)
Comsublant (8)
S/M School, NL (2)
Comsopac (2)
Comsowespac (1)
Comsubsowespac (2)
CTF 72 (2)
Comnorpac (1)
Comsubspac (40)
SUBAD, MI (2)
ComsubspacSubordcom (3)
All Squadron and Div.
Commanders, Subspac (2)
ComSubtrainpac (2)
All Submarines, Subspac (1)
[SIGNATURE: E. L. Hynes Md] [STAMP: FILMED] [HANDWRITTEN: Enter]
E. L. HYNES, 2nd., [HANDWRITTEN: Filed]
Flag Secretary.

[HANDWRITTEN: 18]

— page 96 —
SS183/A16
[STAMP: DECLASSIFIED]

From: The Commanding Officer, U.S.S. SEAL (SS183).
To : The Commander in Chief, U. S. FLEET.
Via : (1) The Commander Submarine Division TWO HUNDRED TWO.
(2) The Commander Submarine Squadron TWENTY.
(3) The Commander Submarine Force, Pacific Fleet, Subordinate
Command.
(4) The Commander Submarine Force, PACIFIC FLEET.
(5) The Commander in Chief, U. S. PACIFIC FLEET.

Subject: U.S.S. SEAL (SS183) - Report of War Patrol Number Eleven.

Enclosures: (A) Subject report.
(B) Track Chart. (ComSubsPac only).
(C) Data required in accordance with ComSubsPac letter,
Serial 0692, of April 10, 1944. (ComSubsPac only).

1. Enclosure (A), covering the eleventh war patrol of this ship
conducted in the vicinity of AREA ONE and in the KURILE ISLANDS AREAS during
the period of AUGUST 8, 1944 to September 17, 1944, is forwarded herewith.

[HANDWRITTEN: FILMED]
[HANDWRITTEN: 89757]
U.S.S. SEAL (SS183)

Care of Fleet Post Office,
San Francisco, California.
17 September 1944.

[STAMP: DECLASSIFIED ART. 0445, OPNAVINST 5510.1C]
BY [HANDWRITTEN: OP09H] DATE [HANDWRITTEN: 6/15/72]

[SIGNATURE: John H. Turner]
JOHN H. TURNER.

— page 97 —
CONFIDENTIAL
Subject: U.S.S. SEAL (SS183), Report of War Patrol No. 11.

(A) PROLOGUE

Returned to PEARL from the tenth war patrol on March 6,
1944. Made preparations for going to Navy Yard and conducting
special exercises. Departed PEARL for MARE ISLAND on March
27th, arriving at destination and commencing overhaul on April
3rd. All outstanding major alterations for which material
available were accomplished. Completion date June 19. Readiness
for sea date delayed four days to July 5th due to necessity of
renewing electrolyte in both batteries on advice of Could
representative. Duty trial period sound tested and depermed.
July 5-13 Enroute MARE ISLAND to PEARL conducting ship and fire
control drills. July 14-15 voyage repairs. July 16-23 Underway
at PEARL conducting Western Sea Frontier training, fired four
mark 18 torpedoes and all control drills. No convoy exercises.
July 24-August 5 at PEARL rewooding stern tubes to remove shaft
squeaks. Tested shafts underway on August 6 and sound tested.
One day loading period, readiness for sea date August 8.

During period March 6 - August 8 the following changes
in office personnel took place:
Lt. Comdr. John H. Turner, USN relieved Comdr. H.B. Dodge,
USN as commanding officer.
Lt. Comdr. R.A. Lewis USNR relieved Lt. Comdr. R.J. Duryea
USN as executive officer.
Lt. C.F. Loughman USNR and Lt. (jg) S.T. Painter USNR re-
ported aboard.
Lt.(jg) L.A. Franz, USN, Ens. D.A. Horner, USN and Radio
Elec. J.H. Craddock, USN were detached.

(B) NARRATIVE

August 8
1330 (VW) Departed PEARL for area, via MIDWAY, in accordance
with Comsubpac Opord 269-44. Escort PC 487 joined at
entrance buoys.

1500 (VW) Set clocks to plus ten zone time.

1947 (") Released escort, proceeding independently.

August 9
0541 (") Made trim dive to 250 feet. No squeaks in either
shaft at 40 R.P.M.

ENCLOSURE (A)
(1)

— page 98 —
CONFIDENTIAL O.J.O.U.E
August 9 (Con't)
0958 (") Surfaced.
0800 (") Sighted 2Y on parallel course distance ten miles.
           Exchanged recognition signals.
1040 (") #4 Main Engine out of commission. Hole in casing of
           clutch filling pump. See enclosure K.
1201 (") Sighted friendly aircraft distance twelve miles on
           opposite course.
1245 (") #4 Main Engine back in commission.
1530 (") Set clocks to plus eleven zone time.
1624 (") Conducted test firing of all small arms.

August 10-11
           Underway enroute MIDWAY conducting training dives.
           Ship and fire control drills and tests on shafts for
           squeaks. On August 11 at 1940 ("), #1 Main Engine
           out of commission with burnt out blower bearings.
           See enclosure K.

August 12
0528 (") #1 Main Engine back in commission.
0735 (") Sighted MIDWAY bearing 244°T distance sixteen miles.
           No air escort.
0910 (") Moored in berth S-2, MIDWAY. Commenced fueling and
           lubeing. Filled safety tank with fuel to be used on
           the way to station. Set clocks to plus twelve zone
           time.
1550 (X) Underway enroute area. Escorted by planes until
1850 (Y) Planes returned to base.

August 13
           Omitted. Crossed date line.

August 14-18
           Enroute area conducting daily ship and fire control
           drills, training dives and school of the boat. During
           run to station the following material defects noted:

(2)
ENCLOSURE (A)

— page 99 —
CONFIDENTIAL

August 16
0500 (L) #3 Main Engine out of commission, broken head studs.
0526 (L) #4 Main Engine out of commission, broken head studs.
1900 (L) #4 Main engine back in Commission.
1925 (L) #3 Main engine back in commission.
August 17
0511 (K) #3 Main Engine out of commission, cracked liner.
1518 (K) #4 Main engine out of commission, cracked liner.
2000 (K) #3 Main Engine back in commission.
August 18
0030 (K) #4 Main Engine back in commission. (See enclosure K
                                            for all of these.)

During run to station considered the following facts by studying
all available information and arrived at my plan of patrol through
them:

1. WEATHER
   (a) AREA ONE

             During time in this area there will be 15 hours of
             daylight.
             The moon will be on an average of ½ and waxing, setting
             early in the evening.
             Fog can be expected about 4 days during the month of
             August. Morning mist lying low on the water can be
             expected up until noon. A considerable amount of rainy
             days are also the rule.
             Currents conform to the coast, setting in a southerly
             direction from TSURUGA WAN to ERIMO SAKI and south along
             the coast south of TSURUGA. Between TSURUGA WAN
             and ERIMO SAKI the set is eastward and stormy in the mouth
             of the strait.

   (b) KURILE AREA

             During the period to be spent in the southwest area
             there will be on an average of 14 hours of daylight. In
             the north east area the same amount of daylight will be
             encountered.

(3)

— page 100 —
CONFIDENTIAL

(b) KURILE AREAS (CON'T)

     Upon entering the southwest area the moon will be
waxing, full on the third of September, ½ waxing upon
entering the northeast area and new upon departure from
that area.
     During August foggy and rainy weather can be expec-
ted over 50% of the days. Conducive to surface running
to get good area coverage. There is more clear weather
in September. Winds from the south bring fog and low
surface visibility.
     No ice should be encountered.
     Currents through the straits in the island chain
all strong and variable. In the OKHOTSK SEA currents
are weak. Tidal currents up to 2 knots may be encoun-
tered to eastward and in the immediate vicinity of LA
PEROUSE.

2. ENEMY SHIPPING ROUTES
     (a) AREA ONE

          Most enemy shipping appears to pass in the vicinity of
     SHIRIYA SAKI at the eastern end of TSUGARU
     KAIKYO, also in the vicinity of AKKESHI WAN and ERIMO SAKI.
     This shipping follows the coastline closely.

     (b) SOUTHWEST KURILE AREA

          Most shipping in this area is probably employed fur-
     nishing supplies to PARAMUSHIRU and MATSUWA. There is
     some inter-island shipping mostly in the vicinity of
     YETOROFU JIMA. The possible routes followed appear to
     be:
          (a) Along the island chain both north west and south-
               east of the islands. Most sinkings in this route
               have been near YETOROFU JIMA, and URUPPU TO.
          (b) Through 48°N, 148°E on 215°T and reverse.
          (c) From LA PEROUSE direct along SAKHALIN ISLAND to 52°N.
          (d) From LA PEROUSE direct to a point off the coast
               of KAMCHATKA at 52°N. (This last one a doubtful but
               previous sinkings and sightings tend to substantiate
               the assumption.)
          (e) Numerous ships have been sighted in the vicinity
               of NAKA SHIRETOKO MISAKI.
          (f) Southward bound traffic may use NEMURO KAIKYO or
               NORTH of KUNASHIRI JIMA.

(4)

— page 101 —
CONFIDENTIAL

(c) NORTHEAST KURIL AREA

Most contacts in this area have been in the vicinity of
PARAMUSHIRO and MATSUA. The possible routes that may be
employed by the enemy are :
(a) Along 52°N from SAHALIN to KAMCHATKA and down the
coast to PARAMUSHIRO.
(b) Along the islands both to northwest and southeast
of the island, particularly the former.
(c) Parallel to the islands and about 65 miles to
northwest.
(d) Numerous sampans are to be found southeast of
PARAMUSHIRO.
(e) A possibility only may be due south of PARAMUSHIRO
used to intercept traffic coming from HONSHU
direct.
(f) Traffic to PARAMUSHIRO may make a landfall on
HOKKAIDO if coming direct from LA PEROUSE.

2A NEUTRAL SHIPPING ROUTES
(A) AREA ONE

No Neutral Shipping.

(B) KURILE AREA

Russian shipping may be expected approaching and de-
parting LA PEROUSE. The route (supposedly for winter
traffic only) follows 46°N from LA PEROUSE
thence to about 151°-30'E at 52°30 N and along that
meridian to the coast of KAMCHATKA in the vicinity of
MIKOYANOVSKI thence south along the coast to the FIRST
KURILE STRAIT.
Submarines have noted that these routes are not follow-
ed too closely, especially in vicinity of ARAIDO and
KITA SHIRETOKO MISAKI (CAPE PATIENCE).
Russian ships following these routes are lighted,
carry special markings, and have not been observed to
zigzag.

3. ENEMY OPPOSITION TO BE EXPECTED
(A) AREA ONE

Air Cover is given most ships along the coastal routes
in area one. Apparently air patrols are not too frequent
until the submarine has disclosed its presence, thereafter
air patrols are heavy.
Surface escorts accompany most shipping. Unescorted
shipping is rare.
Surface patrols are extensive along the coast espec-
ially in the form of sampans and trawlers along the 100
fathom curve. Patrols have also been encountered in the
area between SHIRIYA SAKI and ERIMO SAKI, generally about
half way between.
There is a possible radar and sono station at SHIRIYA
SAKI.
Mines are in the vicinity of SHIRIYA SAKI. My orders
are to stay outside of 100 fathom curve while in the area.

(5)

— page 102 —
CONFIDENTIAL

(B) SOUTHWEST KURILE AREA

     Air coverage is not extensive except in the immediate
vicinity of LA PEROUSE.
     Convoys are escorted, both by DD's and planes. Single
unescorted ships are not infrequent.
     Surface patrols can be expected in the approaches to
LA PEROUSE and in the island passes, otherwise not ex-
tensive.
     Radar on islands used as bases are indicated, but not
definitely located. Possible Radar on NAKA CHIRETOKO
TSAKI.
     Mines are presumed to be in LA PEROUSE. I am ordered
to stay outside of 100 fathom curve in this vicinity ex-
cept in hot pursuit. Major outlying bases probably mined
in shallow water. Stay outside 30 fathom curve other-
wise.

(C) NORTHEAST KURILE AREA

     Aid coverage fairly extensive in this vicinity and ex-
pected to increase due to air attacks on PARAMUSHIRO.
Daily coverage can be expected within two hundred miles
of the island chain in good weather.
     Convoys are escorted. Single ships have been found
close in along the islands.
     Surface patrols may be expected in the island passes,
along the coast of KAMCHATKA and near PARAMUSHIRO.
     Radar has been located at PARAMUSHIRO and is possible
on the other islands of the chain. (Probably mostly air-
craft detection.) Radar equipped escorts have been found
in this area.
     Mines are believed to have been laid inside of 30
fathom curve near the bases in this area.

4. MY MISSION

     To attack and destroy enemy forces encountered and to
report information concerning the movements of important
enemy men-of-war and convoys.

5. PLAN OF PATROL TO CARRY OUT MY MISSION
(A) AREA ONE (August 20-24)

     The necessity of close in patrol along the coast to
get to traffic, the numerous surface patrols, coupled with
good daylight visibility, make a submerged patrol imperative.
Conduct submerged patrol as follows:

     (a) August 20 and 21 along the 100 fathom curve off
         MONONIT SAKI for traffic going south out of TSU-
         GARU KAIKYO.

(3) ENCLOSURE (A)

— page 103 —
CONFIDENTIAL

(A) AREA ONE (August 20-24) (Con't)
    (b) After sunset August 21 shift to ESAN SAKI staying
        outside of 15 miles of SHIRIYA SAKI for traffic
        going north and east out of TSUGARU KAIKYO.
    (c) After sunset August 22 shift to a point off MONBETSU
        heading towards ERIMO SAKI along the 100 fathom
        curve, for traffic running between MURORAN and ERIMO
        SAKI.
    (d) Round ERIMO SAKI on the night of August 23 and run
        along 100 fathom curve to a point south of KUSHIRO
        patrolling there the day of August 24.

(B) SOUTHWEST KURILE AREA (August 25 - Sept 9)
    Poor visibility coupled with light surface and air patrols
    makes surface patrolling a possibility in this area.
    From area ONE proceed along 100 fathom curve to the south-
    ern tip of KUNASHIRI JIMA. Then along southeast coast to
    YETOROFU KAIKYO patrolling that strait one night thence start
    a surface cycle:

    Cycle #1: Along the islands south to SHIRETOKO MISAKI
             thence to 45°N 145°E and then along line
             035°from this point to area boundry then to
             SHIMUSHIRU TO and then down the island chain
             again.
    Cycle #2: From 49°N 149°-05'E to the 100 fathom curve
             off KITA SHIRETOKO MISAKI thence to KITA
             SHIRETOKO MISAKI (CAPE PATIENCE) and north
             along the coast of SAKHALIN to 51°N then
             reverse.
             If the route to the north west of the
             islands proves unproductive try a close in
             patrol along the southeast coast of the
             islands after arriving at SHIMUSHIRU TO and
             transit strait to southwest of YETOROFU
             JIMA and then continue cycle #1

(C) NORTHEAST KURILE AREA (Sept 10-19)
    Although improving visibility may be expected, light sur-
    face patrols and relatively light air patrols, except in the
    immediate vicinity of PARAMUSHIRO, and possibly MATSUWA, make
    surface patrol in this area the rule except in clear weather
    in the vicinity of PARAMUSHIRO and MATSUWA.
    Attempts to leave the southwest area from the northern
    boundary at the coast of SAKHALIN and proceed along the coast
    to 52°N then cross the OKHOTSK SEA to KAMCHATKA thence along
    the coast to the vicinity of PARAMUSHIRO then along the
    island chain to SHIMUSHIRU TO and then reverse but do not go
    west of 152°E and lat. 52°N.
    The area to the southeast of PARAMUSHIRO should be in-
    cluded in one of the sweeps.

(7)
ENCLOSURE (A)

— page 104 —
CONFIDENTIAL

August 19
All times unless otherwise noted are (K)
0100 Commenced running through fog patches.
0605 Heavy fog set in, visibility about 300 yards.
0724 Right full rudder, avoided striking floating mine
by about 20 feet. Mine was black cylindrical about
4 feet in diameter and had horn attachments; no barna-
cles. Posit. Lat. 39-14.2 N Long. 147-47 E.
0835 Fog lifted, patches around the horizon.
1400 Submerged to routine torpedoes and conduct control
drills.
1808 Surfaced. Secured S.D. radar for remainder of time in
area. Will depend on A.P.R. and lookouts.
2155 Entered area, set course for MONOMI SAKI.

August 20
0522 Submerged for periscope patrol off MONOMI SAKI. Closed
coast to one mile off 100 fathom curve, then opened out.
Only contacts one trawler and one sampan. Working
along 100 fathom curve headed north.
1954 Surfaced 17 miles bearing 155°T from SHIRIYA SAKI.
2019 Picked up enemy radar on A.P.R. at 90 MEG. which sett-
led on us for five minutes so at
2029 c/c to 10°T to present least amount of target and
opened out on three engines.
2150 Radar not holding us any more, c/c to 090°T.
2218 Sighted lighted sampan bearing 200°T distance 8000

August 21
0140 c/c to 297°T to head directly for SHIRIYA SAKI.
0452 Submerged twenty-five miles from SHIRIYA SAKI. c/c to
270 to close the coast.
(8)
ENCLOSURE ( A )

— page 105 —
CONFIDENTIAL

August 2 (Con't)
1110 One mile off 100 fathom curve. SHIRIYA SAKI light
     bears 294°T; c/c to 180. Strong north westerly set
     experienced.
1154 c/c to 150°T to compensate for set.

August 22
0552 Submerged to close ESAN SAKI.
1152 Sighted medium bomber bearing 245°T heading south.
     (Aircraft Contact #1).
1213 Patrolling four miles east of ESAN SAKI on five mile
     legs north and south. Depth control very difficult.
     Bathothermograph gives up to 14°F temperature change at
     periscope depth in less than two minutes.
1734 Opening out to northeastward to surface.
2012 Surfaced. New radar set right on us for seven minutes.
     Opened out from coast on three engines until he lost us
     then headed north to sweep along one hundred fathom
     curve between MURORAN and ERIMO SAKI.
2035 Sighted glow of MURORAN steel mills, bearing 290°T
     distance 35 miles. Would make a good point of aim
     for our B-29's.
2355 Received Comsubpac 220912.

August 23
0545 Weak indications of radar on A.P.R.
0608 Submerged south west of MONBETSU heading towards ERIMO
     SAKI along one hundred fathom curve, patrolling along
     ERIMO SAKI - MURORAN - TSUGARU KAIKYO routes.
1129 Sighted small sampan bearing 060°T range 5000 yards
     headed for TSUGARU KAIKYO. He passed about 2000 yards
     astern and looked like an "Honest Fisherman" complete
     with nets and catch on deck. Nothing resembling a
     radio antenna aboard.

(9) ENCLOSURE (A)

— page 106 —
CONFIDENTIAL

August 23 (Con't)

1910 Surfaced. Patrolling along one hundred fathom curve
     to east and northward of ERIMO SAKI, heading for
     KUSHIRO. Weak radar on A.P.R.

2345 Received Comsubpac 231019.

August 24

0100 Heavy fog set in.

0609 (Ship Contact #1) While chasing a gremlin in the fog,
     took a sweep around with radar and found a saturated
     pip at 7900 yards bearing 331°T. Should have picked
     this one up much sooner, not sweeping frequently enou-
     gh. Turned away and commenced tracking.

0620 Target headed in a westerly direction.

0628 c/c to 313°T to close target.

0634 Target course 248°T speed 8.5 knots.

0637 Came left to 248°T on three engines to get ahead of
     target's beam.

0702 Angle on the bow 90 port. Range 5400.

0704 Target stopped.

0707 It finally dawned on me he might be able to hear our
     engines; shifted to battery and at

0708 Headed in towards target at 2/3 range 5000 yards.
     Fog was thick and low visibility about 300 yards on
     surface with sun about an hour and a half high and
     blue skies overhead.

0724-55 Commenced firing three torpedoes from bow tubes, range
     1400 yards, 110 port track, depth setting 3 feet, 10°
     divergent spread. Sea calm.

0725-50 First torpedo hit.

0726-02 Second torpedo hit. Debris and brown smoke cloud about
     600 feet high showed above fog.
     POSIT. LAT. 42-31 N LONG. 144-09 E.

0728 Two heavy explosions.

(10) ENCLOSURE (A)

— page 107 —
CONFIDENTIAL
August 24 (Con't)
0720:15 Pip disappeared from radar at 2800 yards. Target sank.
0730 Set course 120°T at s/s on four engines.
0750 Fog beginning to lift, horizon visibility.
0807 Submerged in clear weather and haze overhead. Re-
loading.
0914 (Ship Contact #2) On routine periscope sweep O.O.D.
sighted submarine broach about 1500 yards dead ahead,
and then submerge again. Bow sighted. Angle on the
bow about 90 port. Submarine painted black. No
identifying marks seen "but he was big".
POS'N. LAT. 42-25 N, LONG. 144-16 E.
0915 Rigged for silent running and c/c to 060°T to try to
pick him up on sound gear.
1013 Nothing having been sighted through periscope except
a possible slick which we passed close aboard, and no
contacts having been made on sound resumed normal per-
iscope patrol and normal running.
1130 Visibility becoming patchy varying from 1500 yards to
unlimited. Decided to stay down until late afternoon
due to submarine contact.
1552 c/c to 045°T to close 100 fathom curve.
1900 Bow planes out of commission (See enclosure K).
1933 Surfaced.
2007 Fog commenced coming in.
2136 Radar contact 025°T, 4000 yds. Stopped and tracked.
Target course 270°T, speed 6 knots. Very small pip
so concluded it was a sampan.
2209 Radar contact 025°T, 4000 yards. Same as 2136.
2222 c/c to 060°T to run along 100 fathom curve south east
of OTCHISHI SAKI.
(11)
ENCLOSURE (A)

— page 108 —
CONFIDENTIAL
August 24 (Con't)
2345 Received Comsubpac 241015.

August 25
0400 Position in doubt should have land on radar by now.
     c/c to 035°T. Bo planes back in commission.
0508 Land contact on radar 333°T, 65,000 yards, SHIKOTAN
     JIMA.
0516 c/c to 030°T rounding SHIKOTAN JIMA heading up for
     south entrance of KUNASHIRI SUIDO. Foggy, visibility
     about 500 yards.
1116 c/c to 315°T to close south west tip of YETOROFU JIMA
     and patrol up towards HITOKAPPU WAN.
1254 Radar contact 270°T, 8700 yards. Commenced tracking
     this fellow just wandering around in south entrance
     of KUNASHIRI SUIDO. Pip shows him too small for tor-
     pedo. Believed to be patrol boat as water where he
     is in is deep for fisherman.
1342 Set course 070°T.
1430 c/c to 315°T.
1700 c/c to 046°T.
2025 Have taken a good sweep in HITOKAPPU WAN with radar,
     nothing there.
2030 c/c to 063°T heading along south coast of YETOROFU
     JIMA.

August 26
0302 c/c to 050°T.
0422 c/c to 000°T to transit YETOROFU KAIKYO.
0615 c/c to 285°T. During transit took a good look in
     MOYORO WAN with radar, nothing there. Fog beginning
     to get patchy.
0630 Sighted two sampans bearing 312°T. Avoided.
0635 Aircraft sighted by lookout crossing stern about
     5000 yards. Submerged.

(12)
ENCLOSURE (A)

— page 109 —
CONFIDENTIAL

August 26 (Con't)

0635 Visibility at the time possibly 7000 yards. No bombs
    (Aircraft Contact #2)
0657 Set course 160°T heading towards land.
0727 Visibility variable. Getting ready to surface when
    at
0737 (Ship Contact #3) Sighted two masts through periscope
    bearing 290°T. estimated range 10,000 yards. c/c to
    290°T.
0757 Nothing further having been sighted and visibility
    shutti in again decided to surface.
0758 S.J. radar out of commission. Staying down until it
    is fixed.
0827 S.J. radar back in commission. Burned out tube re-
    placed.
0829 At 40 feet sweeping with radar, no contacts.
0830 Surfaced. My estimate of the situation now is:
    (a) Plane may be escorting target.
    (b) Don't think target is headed south west or we
    should have picked him up on radar before the
    plane contact at 0635.
    (c) Target is not in radar range now so has gotten
    by us.
    (d) Target can go in two directions from here either
    south east through YETOROFU KAIKYO or north east
    along the island chain.
    Decided to cover him first along the south easterly
    direction and then the north easterly direction.
0831 c/c to 180°T on four engines. Visibility varying from
    500 to 4000 yards.
0907 c/c to 190°T.
0954 c/c to 244°T. He wasn't in MOYORO WAN when we went
    by.
1100 Having covered target speeds up to 12 knots decided
    to try him for the northeast direction. Reversed
    course to 065°T.
1203 c/c to 038°T. Visibility getting patchy again vary-
    ing from 5000 to 8000 yards.

(13) ENCLOSURE (A)

— page 110 —
CONFIDENTIAL

August 26 (Con't)
1301 c/c to 020°T.
1331 c/c to 000°T. Visibility improving all the time.
1349 Came out of fog, visibility unlimited. YETOROFU JIMA
mainly in sight. Can see houses on
and URUPPU TO. now still in the mountain crevesses. Held
course to open out from coast a little.

1400 Sighted three sampans to seaward of us, bearing 345°T.
distance 12,000 yards heading in a southerly direction.
Opened range and then proceeded on up the coast of
URUPPU TO.

1535 (Ship Contact #4) Sighted smoke bearing 083°T on the
edge of low lying surface fog bank between CHIRIHOI
TO and URUPPU TO. Believing this to be the fellow we
were looking for assumed him to be headed north east
and commenced end around to westward.

1650 Target popped out of the fog. Looked like a possible
patrol, M.F.M., clipper bow, counter stern. Turned
away to open range as his masts were visible from the
bridge.

1705 Commenced end around to southward. This end around
made increasingly difficult as the sun gets lower in
the sky due to a mirage between us and the target.
He also has a land background. At times he would sit
on top of the mirage and at other times behind it out
of sight. Target course 140°T. Speed 9 Kts.

1833 Submerged, came to normal approach course at 2/3
speed. Would like a good look at this fellow as I
don't know what he is.

1937 Target not in sight yet and it's getting dark.
surfaced. Nothing on radar. Changed course to
close the coast some more.

2020 Radar contact bearing 103°T range 5950 Yds. Target
going much slower than we had estimated. Closed to
4000 yards and identified him as a trawler too small
for torpedoes on course 140°T, speed 6 knots.

(14)
ENCLOSURE (A)

— page 111 —
CONFIDENTIAL

August 26 (Con't)

2030 "4 Main Engine out of commission, cracked liner.
     (See enclosure K)

2039 Set course for outer convoy route since the possibility
     of our having been sighted from land today is very
     good.

Conclusions for today are that we have wasted about 4500 gallons
of fuel chasing a myth. The masts sighted this morning are now
believed (in retrospect) to have been those of two sampans on
the bank off the northwestern tip of YETOROFU JIMA.

August 27

0230 #4 Main Engine back in Commission.

High periscope patrol across outer convoy routes. Visibility
excellent. Uneventful.

August 28

Radar and intermittent high periscope patrol down reported
convoy lane on base course 215°T in foggy and hazy visibility.
Uneventful.

August 29

0215 Radar contact bearing 245°T, range 32100 c/c to 245°T
     c/s to full on four engines to close contact. Radar
     lost contact on the turn and unable to regain contact.

0240 (Ship Contact #5) Sighted lighted ship bearing 273°T
     Radar regained contact. Tracked target on steady
     course 020°T speed 13 knots. Closed to 8000 yards
     and identified as a properly marked Russian.

0257 Set course 090°T to get to eastward of Russian lane.
     Evidently we had been set to westward.

0352 Left full rudder, all ahead emergency. Avoided a two
     seal spread coming on a broad starboard track.
     Looked like the real thing in this luminescent water.

0400 Set course 035°T to run back along convoy route.

0500 Hazy visibility and intermittent fog patches, until
     1530 when fog and haze lifted.
     (15)

ENCLOSURE (A)

— page 112 —
CONFIDENTIAL

August 29 (Con't)

1030 Reversed base course to 215°T along convoy lane.

1600 Set course 276°T to head for NAKA SHIRETOKO MISAKI.

1657 Sighted floating mine position Lat. 45-53 N. Long.
     145-51 E. Closed mine and put it astern about 400
     yards. Manned after 20 MM and hit it on about the
     40th round. Mine exploded with a loud bang leaving a
     tall persistent column of light brown smoke and water
     spray about 500 feet high.

1703 Went ahead on two main engines, resumed base course.

1709 Sighted float plane DAVE bearing 030°T distance seven
     miles headed in our direction. Submerged. Plane
     evidently attracted by smoke from exploded mine.

1844 Sighted another mine through periscope bearing 171°T
     distance about 500 yards. Position lat 45-55 N
     Long. 145-40 E.

1907 Surfaced. Mine not in sight. Decided not to hunt for
     it due to failing visibility.

1913 C/C to 000°T to head for KITA SHIRETOKO MISAKI. Will
     patrol up the coast of SAKHALIN ISLAND and then return
     to NAKA SHIRETOKO MISAKI from the northward.

August 30

0554 Visibility commenced getting poor, closing to thick
     fog by 1000.

1150 Radar contact on land, KITA SHIRETOKO MISAKI, bearing
     300°T distance 50,000 yards.

1308 c/c to 345°T.

1723 c/c to 340°T. Proceeding up the coast along the 100
     fathom curve.

August 31

0845 At northern boundary of area, c/c to 168°T. Still
     in heavy fog.

1812 Spent thirty minutes tracking the lighthouse on KITA
     SHIRETOKO MISAKI. Looked like a ship at first until
     a speed zero solution was obtained.
     Then checked position by radar and plotted target on
     chart. Found to be on land.

(16) ENCLOSURE (A)

— page 113 —
CONFIDENTIAL

August 31 (Con't)

2145        c/c to 195°T covering shipping lane northward from
            NAKA SHIRETOKO MISAKI.

2300        Visibility starting to improve, fog lifting.

September 1

0531        Submerged northeast of NAKA SHIRETOKO MISAKI. Bright
            clear day.

1920        Surfaced.
            Due to lack of contacts in this area decided to pro-
            ceed to a point 30 miles east of NAKA SHIRETOKO MISA-
            KI and start a search plan covering courses of 045°T
            to 075°T from the area which will cover any shipping
            running direct from the north east entrance of LA
            PEROUSE to KAMCHATKA and the island chain as far
            south as MATSUWA TO with a direct course to PARAMUSHIR
            as a mean.

2045        c/c to 054°T.

September 2

0055        c/c to 100°T.

0402        (Ship Contact #6) Sighted lighted ship bearing 120°T.
            Headed for ship.

0420        Identified as a properly lighted and marked Russian
            freighter on course 200°T, speed 10 knots. c/c to
            000°T.

0700        c/c to 087°T. Conducting high periscope patrol in
            light haze with radar also manned.

1045        c/c to 110°T.

1650        (Ship Contact #7) Sighted masts from high lookout
            plain bearing 005°T. Opened out to southward
            and commenced end around. Target on a course slight-
            ly south of west which would head him for KITA
            SHIRETOKO MISAKI. During the end around target changed
            course to southwest. We are near RUSSIAN shipping
            route so will have to identify this one carefully.
            He seems to be constant helming.

(17)                                ENCLOSURE (A)

— page 114 —
CONFIDENTIAL

Septemb 2 (Con't)

1758 Submerged on estimated target track, angle on the bow
     5° port, range 24,000. Came to normal approach course

1823 Target in sight bearing 023°T angle on the bow 00.
     c/c to 020°T.

1832 Went to battle stations, cannot see any identifying
     markings from my position on his track. Will be all
     ready to let him have it although am very suspicious
     that he is a Russian. Looks like a liberty ship.

1852 c/c to 125°T for a stern tube shot. Sunset.

1900 Ship identified as a properly marked Russian liberty
     ship, well armed carrying correct flag hoist. Held
     sound tracking drill. Sound conditions very poor,
     target picked up by JP at 3400 yards and by JK at
     2500 yards, unable to obtain ping ranges. Target
     went by at 1300 yards, wandering all over the ocean;
     he was either constant helming or the helmsman had had
     one too many. Target course 210°T, speed 11.0 knots.

1913 Russian turned on his lights.

1930 (Ship Contact #8) Surfaced. Another Russian, proper-
     ly marked, bearing 343°T, range 15,000 yards, course
     200°T. Speed 10 knots, not zig zagging, let him
     close to 10,000 yards for identification.

1932 Set course 100°T, continuing search.

September 3

0030 c/c to 326°T.

0450 Hazy visibility at daylight, high periscope and radar
     patrol.

1038 c/c to 097°T.

1100 (Ship Contact #9) Sighted smoke bearing 031°T c/c
     to 031°T to close.

1115 Target popped out of haze, sharp angle on the port
     bow; submerged.

1116 c/c to 300°T. Running in at high speed.

                               (18)
                               ENCLOSURE (A)

— page 115 —
CONFIDENTIAL

September 3 (Co 't)

1144 Target in sight bearing 036°T, range 10,000 yards.
     c/c to 035°T.

1156 Identified target as a Russian liberty ship. Turned
     approach over to control party, sound tracking.
     Took pictures instead of shooting. Sound unable to
     pick up screws until 2600 yards, no ping ranges.
     Target went by at 1500 yards.

1222 Set course 097°T to continue search plan.

1311 Surfaced, target just disappearing into haze.

1330 Radar lost contact at 33,000 yards.

1455 Lookout sighted aircraft bearing 267°T, appeared to
     be a medium bomber banking in our direction, distance
     6 miles. Submerged to 180 feet and rigged for depth
     charge. c/c to 180°T. No bombs. (Aircraft Contact
     #4).

1532 At periscope depth, nothing in sight.

1559 Surfaced. c/c to 097°T.

September 4

0500 Hazy visibility with occasional patch of fog, radar
     and high periscope patrol.

1357 c/c to 195°T. Since we have been unable to find any
     traffic along the outer convoy routes decided to
     try more submerged patrols along the north
     west side of the island chain, visibility permitting,
     otherwise radar patrol.

1503 Short indication of radar on A.P.R., possibly a
     plane.

1602 c/c to 158°T closing BUROTON TO.

1890-2000 Explosions to eastward. Didn't sound like gunfire.
     Finally concluded noise was volcanic. Explosions
     were in the direction of KETOI TO which is an active
     volcano.

1916 c/c to 239°T passing between BUROTON TO and CHIRIHOI
     TO.

2146 Sighted three sampans headed northeast, avoided.

(19)

ENCLOSURE (A)

— page 116 —
CONFIDENTIAL

Septembe r 5

0509 Submerged in middle of northern entrance of YETEROFU
KAIKYO. Four sampans in sight. Headed down towards
northwest tip of 100 fathom curve off YETEROFU JIMA.
Visibility good.

1531 (Ship Contact #10, Attack #2) Sighted smoke bearing
183°T. c/c to 183°T.

1538 Bearing drawing to left. c/c to 087°T. Started
trying to hold bearing on normal approach course
at standard speed.

1645 Target which is not zig zagging, getting by at
8000 yards. Has a small nondescript escort on port
quarter. Ide ntified as plumb bow, air scoops on fore-
castle, open bridge, funnel and air scoops,
stick mast, counter stern, similar to BANDOENG MARU
(EU) page 130 of GNI 208-J. (REV) Continued to run as
standard speed to hold target as long as possible
and to open out from lane prior to surfacing.

1757 Still have target in sight at 14,000 yards. Approach
now complicated by sampan headed for us from dead
ahead. Avoided sampan at 600 yards and continued
along last target course.

1826 Target no longer in sight.

1905 Surfaced. Chasing target on course 050°T. Full on
three engines, charging on other engine.

1910 Sighted two sampans bearing 030°T. Avoided.

1922 c/c to 085°T to head for TOKOTAN WAN on URUPPU TO
as that is closest port he can make.

1959 Radar contact bearing 085°T, range 11,800. Started
end around to westward.

2015 Moonrise, visibility good with clear horizon. Sea
a dead flat calm.

2104 Ahead of target and on his track, target in sight at
10,000 yards, unable to see escort. Had hoped to be
able to make a surface attack, but continually good
visibility and lack of haze cuased me to decide on
a submerged radar attack going to periscope depth
when close to target.

(20) ENCLOSURE (A)

— page 117 —
CONFIDENTIAL

September 5 'Con't)

2119 Dove, headed away from target on course 050°T.
     Target bearing 230°T, Range 8000.

2128 Came left to 320°T to open out from track, for a stern
     tube shot. Wanted to get outboard of the escort be-
     fore firing. During end around had found escort 2000
     yards on target's port quarter.

2144 Radar picked up escort bearing 221°T, range 2700 yds.
     This would give him a ten port angle on the bow. He
     is out farther than I had hoped for.

2146 Went to 60 feet target in sight through periscope
     with land background.

2156-12 Fired four MK18-1 torpedoes from stern tubes, torpedo
to   run 3500 yds., gyro 160, track 116 port, target speed
2156-46 6.8 knots, target course 055, depth setting 5 feet.
     All missed (see Enclosure H).

2157 Went to deep submergence.

2204 Two depth charges, aft.

2247 No further indications of enemy activity, came to
     periscope depth. All clear through periscope.

2257 All clear by radar, surfaced.

2258 c/c to 060°T to chase target if he continued in his
     last observed direction.

2332 Sight and radar contact on two sampans bearing 010°T.
     Range 7300 yards, avoided and continued chase.

September 6

0208 A.P.R. has land based radar.

0224 Have covered target for speeds up to 12 knots and
     have no contact. He is not in any of the coves
     between TOKOTAN TO and the north east end of URUPPU
     TO. Decided to run up to the southwest end of SHIRU
     TO and conduct submerged patrol there. This
     will get him if he comes through on this side of the
     islands going north. c/c to 020°T to round BUROTON
     and cover outer routes target may take.

(21)
ENCLOSURE (A)

— page 118 —
CONFIDENTIAL

September 6 (Con't)

0230 Sight contact on two sampans bearing 073°T, avoided.
     Continued around KUROTON TO and headed for SHINUCHIRU
     TO.

0307 A.P.R. lost land based radar.

0500 Hazy: visibility 10,000 yards and improving.

0515 Submerged on course 095°T closing coast. During
     the day patroling up and down the coast of SHIMU-
     SHIRU TO, no contact. Target must have doubled back
     or taken another route. My dope is so
     old, cold and indefinite did not send contact report
     when at

1935 Surfaced in bright clear visibility. Headed down
     the island chain conducting radar search along coast
     of URUPPU TO.

September 7

0640 Submerged in the middle of YETEROFU KAIKYO, heading
     down the north west coast of YETEROFU JIMA. During
     the day took a look into SHIBETORO BYOCHI for sul-
     phur shipping, nothing there but a small town.

1918 Surfaced. Continued on down the coast of YETEROFU
     JIMA. Numerous lights sighted along the beach and
     in the hills.

September 8

0030 Set course 350°T heading for outer convoy routes
     after a radar look into RUBETSU WAN.

0455 Fog closing in, visibility 1500 yards.

0625 Fog lifted, hazy visibility with complete overcast.

0636 A.P.R. contact very strong.

0637 Submerged, assumed radar to be on a plane; this
     assumption believed correct in view of later events.
     Sixty miles from land.

0809 Surfaced, no contacts on A.P.R.

(22) ENCLOSURE (A)

— page 119 —
CONFIDENTIAL
September 8 (Con't)

1204 (Ship Contact #11, Attacks #3,4 and 5), O.O.D sigh-
ted three ships which popped out of the haze hull down
bearing 050°T. Angle on the bow 20 port. Submerged
c/c to 050°T.

1238 Nothing in sight yet at 55 feet so surfaced.

1239 Sight a target through high periscope bearing 055°T,
angle on the bow very sharp (hull down). Submerged
c/c to 055°T.

1331 Since bearing change does not jibe with a port angle
on the bow, and failure of target to appear by now
indicates that the angle on the bow was not zero,
assumed angle on the bow must be very broad. Sur-
faced. Target not in sight. Running down last
true bearing on four engines.

1415 Radar contact 16,000 yards bearing 080°T.

1419 Upper works of targets popped out through the haze.
Opened range to 17,000 yards and commenced end around
to north westward. Target course easterly.

1440 Weak A.P.R. contact on high frequency.

1540 Target course 065°T, speed five knots. This doesn't
take him anywhere so expect he will come left later,
probably after sunset. There are several targets.

1553 Calling SEAWOLF on inter-area frequency but unable
to raise them.

1745 Sent my 080735 blind. Receipted for at 1813.

1822 In position ahead of target group at 18,000 yards.
Turned to run with them and slowed down to close
range and let radar regain contact which was lost
on turn.

1832 Sunset.

1843 Haze lifted leaving us feeling very naked with target
group in sight at about 18,000 yards. Submerged.
Opening track and waiting for haze to settle again or
for it to get darker. Want to make my first attack
on surface before moon rises.

(23)

— page 120 —
CONFIDENTIAL

September 8 (Co 't)

1917 Surfaced, hazy again and getting dark. Radar has
target group at 12000 yards. Continued tracking
and waiting until it gets good and dark.

1936 S.J. Radar getting jamming. Target group has changed
base course to 040°T. Speed now is 6.8 knots. Leaves
us out on his starboard bow. Started end around
back the other way heading for a point 5000 yards off
the starboard track and 15,000 yards ahead of target.

2014 In position. Headed in at 15 knots, keeping target
dead ahead. Target group is two colums of three ships
each with an escort on each wing and close in to lead-
ing ship. Biggest targets are in the far column.
Zigzagging.

2038 Targets in sight at 7000 yards. Picked close escort
as our target. He is a very rakish looking destroyer
similar to FUBUKI CLASS (EU).

2043 All stop, coasting in opening outer doors.

2047-27 Fired four torpedoes from the bow tubes at a wall
to of ships with escort as point of aim, torpedo run
2047-52 3200, track 80 starboard, course 035°T, speed 7 knots,
set at 3 feet with 1° divergent spread. Torpedoes
looked like four searchlights in this extremely lu-
minescent water on a dark night. Expecting to see
the destroyer turn towards us at any time. Started my
turn away at emergency speed.

2049-35 Torpedoes started hitting. After second hit target
to disintegrated in a terrific explosion which was over
2050 2500 feet in the air, black on the outside and filled
with orange colored flame. Escort not seen again.

2051 String of six explosions. Other escort dropping
to depth charges?
2054

2055 All stop. Now see two ships burning aft of the con-
voy which has turned away and scattered. Other escort
is not chasing us so started reload and watched ships.
Other escort went back to burning ships, and is stand-
ing by them. Radar has them stopped. This is a
pleasant surprise.

(24)
ENCLOSURE (A)

— page 121 —
CONFIDENTIAL

September 8 (Con't)

2104
Opening range slowly to eastward trying to see what
the rest of the convoy is doing and at the same time
see what is happening to the stopped ships.

2120
Remainder of convoy getting away, c/c to 280°m to
start trying to catch them, and start end around.

2127
One of burning targets flared up and lighted up his
portion of the ocean then not seen again. Radar now
have one target which is burning and
flaming up with explosions occasionally.

2141
Started end around to eastward on convoy which has
re-grouped into two columns of two ships each. Range
16,000.

2143
Moonrise, hazy visibility and overcast.

2201
Lost pip of last stationary target at 11,000 yards.
He is still burning.

2253
In position 15,000 yards ahead of target and 5000 yards
off starboard track. Started in but pulled out again
at 12,000 yards because moon came through the cloud.
Cloud coming up over the horizon, will
start in when it starts to cover the moon. Could see
targets at 12,000 yards in the moonlight. Shifted
over to his port track and be away from the
moon on him.

2329
In position 12,000 yards from target and 5000 yards
off track. Moon going behind cloud, heading in at
15 knots, staying carefully pointed at target which
is leading ship in port column.

2339
Slowed to 2/3 to cut down wake and wash as much as
possible.

2345
Moon came out from behind cloud. Feel very naked.
Will fire as soon as torpedoes will get there if he
doesn't see me.

2347-21
to
2347-53
Commenced firing four torpedoes from the bow tubes,
torpedo run 4400, track 100° port, target course 030°
true, speed 7 knots. Right full rudder all ahead
emergency. Only four ships in the convoy, the two
largest in the starboard column are big and similar
to KASIMA MARU (EU) page 29 of ONI 208-J(REV).

(25)

ENCLOSURE (A)

— page 122 —
CONFIDENTIAL

September 8 (Con't)

2347-21     The leading ship in port column is not as big as the
to          other two but still a fair sized AK similar to TANGO
2347-53     MARU (EU) page 54 of ONI 208-J (REV). Rear ship in
(Con't)     port column looked like RISIN MARU (EU) page 219 of
            ONI 208-J (REV). There was no escort present. He
            must be back picking up survivors.

2350-40     Observed two hits in target, one abaft stack and one
            inside the stern. Three hits heard inside the boat.
            Target let out a big belch of black smoke and kept
            on going! The two big ships in the starboard column
            turned away and the after ship of the port column tur-
            ned towards me. My course 290°T. going ahead emerged.
            The leading ship in the port column kept his course
            and settled by the stern about 1/2 if the distance up
            his counter stern, but he did not stop.

2352        The after port column ship is giving me a zero angle
            on the bow. Can see gun fire splashes in the wake on
            the P.F.I. His flashless powder is good as I can't
            see any gun flashes on him. Pulling away from him
            easily at 18.5 knots flooded down. He is just 'shoot-
            ing' at our wake which looks like a search light.

2352-25     Very heavy explosion from the direction of the target.
            Shook the ship up considerably. He's still going
            though.

2355        Maru that was chasing us turned away to join others.
            Stopped to see what they are doing. Targets pulled
            off to eastward and then started back towards the
            northeast, finally settling on a base course of 020°T.

September 9

0000        Continuing end around to westward of convoy at 14,000
            yards. Still four ships in convoy, one of which is
            damaged. Convoy has slowed a out one half knot.
            Have one torpedo forward and four aft, intend to make
            submerged approach on largest targets in the starboard
            (east) column.

0125        Sent my 081515 which was received for eight minutes
            later. Message sent blind twice. Boys guarding the
            circuit in PEARL really "on the beam"
            (26)

ENCLOSURE (A)

Page No. 27 not used.

— page 123 —
CONFIDENTIAL
September 9, (Con't)

0207         Ahead of convoy 15,000 yards and on it's track head-
             ed in. Picked leading ship of starboard column,
             which still is one of the two big ships, as our tar-
             get. Identified on last attack as being similar to
             KASIMA MARU (TU).

0222         Submerged to radar depth 10,000 yards ahead of con-
             voy and on it's track. Convoy now consists of five
             ships, one of which is escort ahead of the east col-
             umn. Escort has finished his business with the ship
             sunk on first attack and has rejoined convoy. He is
             small.

0234         Targets in sight through periscope. Range 6800 yds.
             periscope depth.

0235         Started coming left for 70 starboard track and open
             out from his track.

0242         Have escort in sight, angle on the bow 20 starboard,
             range 3000 yards, bearing 230°T. crossing astern.
             He looks like a PC.

0250-03      Commenced firing four mark 18-1 torpedoes from stern
to           tubes, torpedo run 3950, track 70 starboard, target
0250-39      course 000°T, speed 6.7 knots, depth set 6 feet. At
             this time escort has crossed stern and is on port
             quarter, distance about 800-1000 yards (estimated)
             angle on the bow 30 starboard. Fired a little ear-
             ly, I wanted him to pick us up very soon. Started
             deep rigging for depth charge. Right full rudder
             all ahead 2/3.

0252         Having terrible time trying to fight our way through
             a 26° gradient. Blew negative too soon then had to
             then blow again when we got deep. No
             hits heard in Conning Tower or Control room, but
             sound and personnel in after battery, the two engine
             rooms and after torpedo room heard two hits. After
             got runs of 3m 50s and 3m 55s. All
             agree on the number of hits. Hits not heard in con-
             trol or Conning Tower due to confusion reigning at
             the time, trying to get boat down.

(28)         ENCLOSURE (A)

— page 124 —
CONFIDENTIAL

September 9, (Con't)

0257 Denth charge on starboard quarter not too close.
resumed breathing. Started fish tailing on 150°T
at slow speed. He doesn't know where we are. Sound
conditions poor.

0300 Numerous small explosions all over the ocean; sounds
to like they are covering the area with gunfire.
0310

0316 Heavy explosion in direction of the target, didn't
sound like a depth charge.

0402 Depth charge, not close.

0523 Aircraft bombing area.
to
0532

Received a total of 47 aircraft bombs at 0554; 0611; 0812; 1000;
1005; 1020; 1046; 1247; 1400; 1540. After bombings at 1000 we
shortly thereafter, which were pretty close, figured we had a
leak somewhere so closed all vents and secur'ed all air blow val-
ves from the 3000 pound manifold to the last tank hull valve.
They started getting further away after this and lost us during
the early afternoon. Expected surface help for the planes but
it never arrived. Spent the day fishtailing at deep submergence
until 1700 making way to eastward.

1700 Steadi ed on course 100°True.

1855 At periscope depth, clear visibility scattered clouds,
dead flat calm.

2036 Surfaced. c/c to 120°T. Position in doubt, heading
for YETEROFU KAIKYO to get out of area. SEARAVEN
is probably still up in my new area chasing convoy.
Decided to head for MIDWAY and notify Comsubpac of
my action when I am well clear of the islands.

2336 Radar contact on land at 90,000 and 120,000 yards,
which puts us 18 miles to the eastward of our D.R.
Can just make it through YETEROFU KAIKYO if nobody
bothers us.

September 10

0200 Entering YETEROFU KAIKYO. Dodging sampans in the
middle of the strait and working through in bright
moonlight with surface haze.

(29) CLOSURE ( A )

— page 125 —
CONFIDENTIAL

September 10 (Con't)
0200 (Con't) Sampans weren't this far in the straight when we
were working around here before; believe they
are patrols.
0412 Set course 136° for MIDWAY. Clear visibility at
daylight.
0443 Submerged for periscope patrol.
Uneventful day resting crew.
1832 Surfaced. Started speed of advance of 11.6 knots
on two engines, to arrive MIDWAY at proper time.

September 11
0025 Decoded comsubpac 100441.
0130 Sent my 101530 which was receipted for.
0630 Decoded Comsubpac 101827. c/c to 005. Changed speed
to four engines which gives us 15 knots into the sea.
Boat pounding heavily.
0725 #1 Main Engine out of commission. Oil in the genera-
tor. Going ahead on three engines. (See enclosure K)
1545 #1 Main Engine back in commission, going ahead on
four engines. Will get to destination by 0900 if
we aren't driven down.
1830 Decoded Comsubpac 110559. c/c 143°T, and slowed
to two engines.

September 12-16
Returning to MIDWAY conducting ship and fire control
drill's daily. Intensive school of the boat.
September 16 repeated upon crossing date line.
During return trip suffered following material casual-
ties:

September 13
1630 #3 Main Engine out of commission; cracked liner.
All of our spares have been used.

(30) ENCLOSURE (A)

— page 126 —
CONFIDENTIAL

September 14

1645 (L) Upon surfacing flooded out #1 main engine, cracking
          two liners. Removed one good liner and put it in #3
          Main engine. (See enclosure K)

2200 (L) #3 Main Engine back in commission.

September 17

0755      Moored at MIDWAY.

(31)

— page 127 —
(C) WEATHER

Enroute area, weather was excellent. Wind and sea
never exceeded force three. Visibility was uniformly
good, no star sights being missed.

In area one considerable fog at night (23% of the
total time) was encountered. Temperatures were mild:
minimum 68 deg. F., maximum 82 deg. F. Navigation,
principally by radar, was satisfactory.

In southwestern Kuriles area weather continued mild
with maximum temperature 70 deg. F., minimum 42 deg. F.
average a comfortable 60 deg. Seas averaged force 2
and no heavy weather was encountered. Heavy fog obtained
40% of the time, skies being overcast or heavily clouded
most of the balance.

(D) TIDAL INFORMATION

CURRENT OBSERVATIONS
DATE | GCT TIME | LATITUDE | LONGITUDE | SET | KTS. DRIFT | WIND
-----||||||------
8/18 | 2100 | 40-10 N | 142-45 E | 050 Deg. | .5 | SW 1
8/20 | 1100 | 41-00 N | 141-00 E | 270 Deg. | 1.25 | SW 1
8/21 | 0900 | 41-15 N | 141-45 E | 270 Deg. | 1.00 | SE 1
8/21 | 1500 | 41-40 N | 142-30 E | 060 Deg. | 1.50 | SE 2
8/23 | 2018 | 42-10 N | 142-00 E | 095 Deg. | 1.50 | NE 1
8/23 | 0530 | Off Erimo Saki | 150 Deg. | 0.50 | Calm
8/25 | 0600 | 44-30 N | 147-30 E | 160 Deg. | 1.00 | Calm
8/25 | 1700 | Off Etorofu Shima (South) | 185 Deg. | 1.00 | ESE 1
8/26 | 0248 | In Etorofu Kaikyo | 190 Deg. | 4.00 | ESE 2
9/1 | 0800 | 46-19 N | 144-10 E | 320 Deg. | 0.50 | E 2
9/2 | 1809 | 46-39 N | 145-35 E | 180 Deg. | 0.80 | Calm
9/3 | 1700 | 47-04 N | 151-05 E | 215 Deg. | 1.50 | Calm
9/4 | 1745 | 46-51 N | 149-14 E | 222 Deg. | 1.25 | Calm

(E) NAVIGATIONAL AIDS
AREA ONE

On the night of August 19th, Shiriya Saki Light was
observed to exhibit normal characteristics with appar-
ently reduced range. No other aids to navigation were
observed.

SOUTHWEST KURILE AREA

Little celestial navigation was possible. Currents
were unpredictable, but, except in the vicinity of land,
negligible. Thanks to the radar, no difficulties in
navigation were encountered.

(32)

— page 128 —
(F) CHIP CONTACTS
NO. TIME LAT
DATE LONG TYPE(S) INITIAL ESTIMATED HO CONT. REMARKS
RANGE COURSE &
SPEED
1 0610 42-31.2 N Unk. 7900 yds 250 R. Sunk
8/24 144-10.5 E 8½ Kts.

2 0920 42-25.0 N Submarine 1500 yds 270 P Sub broached,
8/24 144-18 E 6 Kts. could not regain
contact. Believed
to be manned.

3 0730 45-35.4 N Unk. 12000 yds 040 P. Small
8/26 149-0.1 E 9 Kts for Torps.

4 1635 46-22.0 N Trawler 18000 yds 140 SD Russian
8/26 149-54.0 E 9 Kts.

5 0215 45-44.7 N Cargo 32000 yds 020 R Russian
8/29 145-47 E 12 Kts

6 0402 46-40.0 N Cargo 15000 yds 200 SD Russian
9/2 145-31.0 E 10 Kts

7 1655 47-09.5 N Cargo 25000 yds 210 SD Russian
9/2 146-21.4 E 11 Kts

8 1930 47-00.3 N Cargo 13500 yds 240 R Russian
9/2 146-09.5 E 11 Kts

9 1100 48-06.8 N Cargo 20000 yds 216 SD Russian
9/3 146-09.0 E 11 Kts

10 1531 45-43.0 N Cargo & 21000 yds 060 SD Missed
9/5 148-44.3 E Patrol 6.8 Kts

11 1204 46-44.7 N 1 DD, 4 25000 yds 065 SD 3 attacks
9/8 147-05.0 E AK, 5.0 Kts
1 DD or
DE

(53)

— page 129 —
(C) AIRCRAFT CONTACTS

S Contact Number | 1 | 2 | 3 | 4
U Date | 8/21/44 | 8/26/44 | 8/29/44 | 9/3/44
B Time (zone) | 1145 | 0648 | 1710 | 1455
P Position: Lat. | 41-20.1 N | 45-36.5 N | 45-54 N | 45-07 N
          Long. | 141-35.0 E | 149-01.3 E | 145-50.5 E | 146-29 E
R Speed | 3 Kts. | 10 Kts | 10 Kts | 10 Kts
I Course | 235 | 285 | 276 | 097
N Trim | Per | Surf. L.T. | Surf. L.T. | Surf. L.T.
E Min: since last
S.D. radar search | Secured | Secured | Secured | Secured

A Number | 1 | 1 | 1 | 1
I Type | Topsy | Sully | Dave | Unk.
R Prob Mission | Trans. | Pat. | Pat. | Unk.
C How Contacted | P | SD | SD | SD
R Initial Range | 3000 | 5000 | 14000 | 6000
A Elev. Angle | 8 | 2 | 3 | 11
F Range and El.-
T Brg. of Plane-
When it Dect. S/M | N.D. | N.D. | N.D. | N.D.

C (State(Beau- | 0 | 1 | 1 | 1
O Sea: ( fort)
N (Direction(Rel) | 230 | 090 | 170 | 090
D Visibility (Miles) | 4 | 4 | 7 | 8
I (Height in | 2000 | 5000 | 7000 | 8000
T Clouds: (Ft.
I (Perc. overcast) | 1. | .4 | .8 | 1.
O (Bearing (Rel)
N Moon: (Angle
S (Perc. Illum.)

Type of Camouflage: Submarine low visibility design #32/355-3.

(34)

Page No. 35 not used.

— page 130 —
U.S.S. SEAL Torpedo Attack No. 1 Patrol No. 11
0725
Time (-10) Date 8/24/44 Lat. 42-30 N Long. 144-05 E

TARGET DATA - DAMAGE INFLICTED

Description: Unseen ship estimated by our best and most experienced
             radar operator to be about 2000 tons, from the size
             of the pip.

Ship(s) Sunk: One unseen ship.

Ship(s) Damaged or
Probably Sunk: None.

Damage determined by: Two hits heard through hull. Hits heard
             and column of brown smoke and debris 600 feet high obser-
             ved above the fog from the bridge. Radar pip disappeared
             3 minutes and 45 seconds after first hit at range of 2800
             yards.

Target draft unknown Course 290(T) Speed 1 Range 1400
                                                              (at firing)

OWN SHIP DATA

Speed 9.5 Course 002°(T) Depth on surface Angle 0
                                                              (at firing)

FIRE CONTROL AND TORPEDO DATA

Type Attack: Surface radar approach using S.J. radar with lobing
             inside of 7000 yards. T.D.C. and plot on D.R.T.
             Information from range and bearings
             taken every minute. Sound bearings and ranges not
             obtained, conditions unfavorable.

(36)

— page 131 —
TORPEDO ATTACK NO. 1

Tubes Fired             4         3         2
Track Angle             110 Port  109 Port  110 Port
Gyro Angle              359.2     000.4     359.2
Depth Set               3 feet    3 feet    3 feet
Power                   High      High      High
Hit or Miss             Hit       Hit       Miss
Erratic (yes or no)     No        No        No
Mark [UNCLEAR: Fuze] No.        23        23        23
Serial No.              62220     49188     61730
Mark [UNCLEAR: Fuze] or         6-4       6-4       6-4
Serial No.              1647      11351     725
Actuation Set           Contact   Contact   Contact
Actuation Actual        Contact   Contact   -
Mark War Head           16-1      16-1      16-1
Serial No.              3156      16261     11633
Explosive               Torpex    Torpex    Torpex
Firing Interval         -         15 Secs.  15 Secs.
Type Spread             1°Left    1°Right   0°
Sea Conditions          Calm      Calm      Calm
Overhaul Activity       Sub Base  Sub Base  Sub Base
Remarks                 Pearl Harbor Pearl Harbor Pearl Harbor.

— page 132 —
U.S.S. SEAL Torpedo Attack No. [HANDWRITTEN: 2] Patrol No. [HANDWRITTEN: 11]
Time [HANDWRITTEN: 2156] Date [HANDWRITTEN: 9/5/44] Lat. [HANDWRITTEN: 45-55 N] Long. [HANDWRITTEN: 149-29 E]

TARGET DATA - DAMAGE INFLICTED

Description: Target was a black hull, counter stern ship of about
  4000 tons with air funnels on forecastle and around
  stack. Two stick masts and single stack. Stern
  was cluttered with lifeboats and gear. Two well
  freighter, loaded. Very similar to BANDOENG MARU
  (EU) of page 130, ONI 208-J (REV). Observations
  made through periscope at 8000 yards.
  Escort was a small nondescript ship, probably a
  trawler.

Ship(s) Sunk: None

Ship(s) Damaged or
probably sunk: None

Damage determined by: None

Target draft Unknown Course [HANDWRITTEN: 055°(T)] Speed [HANDWRITTEN: 6.8] Range [HANDWRITTEN: 3600]
  (at firing)

OWN SHIP DATA

Speed [HANDWRITTEN: 3.5] Course [HANDWRITTEN: 324] Depth [HANDWRITTEN: 60 Ft.] Angle [HANDWRITTEN: 0°]
  (at firing)

FIRE CONTROL AND TORPEDO DATA

Type Attack: The approach checked well up until the time of taking
  the final bearing at which time the bearing was 10°
  off, after having checked on the previous two obser-
  vations through the periscope. The T.D.C. operator
  called for another check bearing but the Commanding
  Officer to go ahead and shoot as target
  was getting by.
  It is now believed that the Commanding Officer in
  the haste of trying to get off his first night
  periscope war shot took the final check bearing on
  the escort instead of the target. He ordered the
  control party to shoot not knowing the amount the
  observed bearing was off from the generated T.D.C.
  bearing.
  Surface Radar approach after end around, obtaining
  target course and speed with SJ radar on lobing.
  Plot on D.R.T. coordinated information
  from radar ranges and bearings. Submerged to radar
  depth. 1100 yards ahead and 1500 yds. off targets
  starb'd track. Trailed until range became
  4800 yards. Went to 60 feet obtained periscope
  bearings until time of firing. Sound bearings and
  ranges not obtained, conditions unfavorable.

— page 133 —
TORPEDO ATTACK NO. [HANDWRITTEN: 2]

| | 5 | 6 | 7 | 8 |
|---|---|---|---|---|
| Tubes Fired | 5 | 6 | 7 | 8 |
| Track Angle | 110° Port | 110° Port | 114° Port | 112° Port |
| Gyro Angle | 164.3 | 164 | 160.5 | 161.7 |
| Depth Set | 5 ft | 5 ft | 5 ft | 5 ft |
| Power | - | - | - | - |
| Hit or Miss | Miss | Miss | Miss | Miss |
| Erratic (yes or no) | No | No | No | No |
| Mark Torpedo | 18-1 | 18-1 | 18-1 | 18-1 |
| Serial No. | 55235 | 55128 | 55489 | 55596 |
| Mark Exploder | 4-7 | 4-7 | 4-7 | 4-7 |
| Serial No. | 16768 | 17395 | 17099 | 16731 |
| Actuation set | Contact | Contact | Contact | Contact |
| Actuation Accual | - | - | - | - |
| Mark War Head | 18-1 | 18-1 | 18-1 | 18-1 |
| Serial No. | 655 | 251 | 434 | 1284 |
| Explosive | Torpex | Torpex | Torpex | Torpex |
| Firing Interval | - | 10 Secs. | 12 Secs | 12 Secs |
| Type Spread | 1° Left | 1° Right | 1½° Left | 1½° Right |
| Sea Conditions | | | | |
| Overhaul Activity | Sub Base P.H.T.H. | Sub Base P.H.T.H. | Sub Base P.H.T.H. | Sub Base P.H.T.H. |
| Remarks | | | | |

(59)

— page 134 —
U.S.S. SEAL Torpedo Attack No. 3 Patrol No. 11
Time 2047 (-10) Date 9/8/44 Lat. 47-18 N Long. 148-28 E.

TARGET DATA - DAMAGE INFLICTED

Description: Convoy consisting of eight ships; six marus and
two escorts. Marus in two columns abreast of each other, es-
corts just outboard of leading ships in each column.
Target was taken as escort just abreast of leading ship of star-
board column. He was a rakish looking new type two stack des-
troyer similar to FUBUKI CLASS (EU).
The Other two ships were not identified except that they were
medium sized merchant ships.

Ship(s) sunk: 1 FUBUKI CLASS (EU) DESTROYER
           1 UNIDENTIFIED MEDIUM SIZED MERCHANT SHIP. (UN)

Ship(s) damaged:
or probably sunk: 1 UNIDENTIFIED MEDIUM SIZED MERCHANT SHIP
                   (UN.)

Damage determined By: The FUBUKI was seen to disintegrate in a
great conflagration after the second hit. The size of the ex-
plosion was at least 2500 feet high and 500 feet wide at its high-
est point. The column was black on the inside and filled with
orange colored flame. Pip collapsed. The first torpedo hit be-
tween the stacks and the second hit in the vicinity of the after
guns. The target could not be seen at 4000 yards after the ex-
plosion.
    The second two torpedoes were not seen to hit but four hits
were heard in the boat. Upon pulling clear of the convoy two
ships were seen to be burning and stopped. Other escort stood
by these ships. Thirty two minutes after first seeing burning
ships. One of the Marus flared up and then not seen there-
after. His pip disappeared. The other burning ship would
flare up occasionally. This pip was lost at 11,000 yards but
the occasional flare ups could still be seen.
    On attack in bright moonlight three hours later there were
only four ships in the convoy and no escort. On attack six
hours later escort had rejoined convoy.

Target draft Unknown Course 035°T Speed 7 knots Range 3300
                                                (at firing)

O'T SHIP DATA

Speed 8.5 kts. Course 312 Depth Surface Angle 0°
                                        (At firing)

(40)

— page 135 —
Torpedo Attack No. 3

FIRE CONTROL AND TORPEDO DATA

Type Attack: Surface radar following end around from which
T.D.C. obtained base course and speed. Posi-
tion taken ahead on starboard bow range 5,000
yards off track of right leg. Headed in on true
bearing, T.D.C. and plot on D.R.T. coordinated
information to check target course and speed.
S.J. Radar on target group. Target
group zigged away, shifted to near target,
when range was 9400 yards, angle on the bow 100.
New target data: 200, 80 starboard track.
Kept headed upon true bearing fired bow tubes,
when range 3300 yards. Reversed course, headed
out, reversed true bearing. Sound bearings not
obtainable conditions unfavorable.

(41)

— page 136 —
CONFIDENTIAL
TORPEDO ATTACK NO 3

Tubes Fired | 4 | 3 | 1 | 2
Track Angle | 80 Stbd. | 80 Stbd. | 83 Stbd. | 84 Stbd.
Gyro Angle | 343 | 343.5 | 346.5 | 347
Depth Set | 6 Ft. | 6 Ft. | 6 Ft. | 6 Ft.
Power | High | High | High | High
Hit or Miss | Hit | Hit | Hit | Hit
Erratic (yes or No.) | No | No | No | No
Mark Torpedo | 23 | 23 | 23 | 23
Serial No. | 49258 | 61889 | 49551 | 49981
Mark Exploder | 6-4 | 6-4 | 6-4 | 5-1
Serial No. | 21822 | 18519 | 7353 | 1537
Actuation Set | Contact | Contact | Contact | Contact
Actuation Accual | Contact | Contact | Contact | Contact
Mark War Head | 16-1 | 16-1 | 16-1 | 16-1
Serial No. | 16252 | 20850 | 12529 | 20841
Explosive | Torpex | Torpex | Torpex | Torpex
Firing Interval | - | 11 Sec. | 10 Sec. | 8 Sec.
Type Spread | ½° right | ½° left | 1½° right | 1¼° left
Sea Conditions | choppy | choppy | choppy | choppy
Overhaul Activity | Sub Base P.H.T.H. | Sub Base P.H.T.H. | Sub Base P.H.T.H. | Sub Base P.H.T.H.
Remarks | | | |

(42)

— page 137 —
CONFIDENTIAL

U.S.S. SEAL Torpedo attack No. 4 Patrol No 11
Time 2347 (-10) Date 9/8/44 Lat. 47-40 N Long. 148-36 E.

TARGET DATA - DAMAGE INFLICTED
Description: Plumb bow, two wells, counter stern, mast fun-
nel, mast with low bridge forward of stack and
numerous air scoops. Resembled TANCO MARU (See
page 54 of ONI 208-J(REV).

Ship(s) Sunk: None
Ship(s) damaged or
probably sunk: As described above.

Damage determined by:
Two hits observed between stack and stern, 3 heard bel-
explosionheard 1 minute 45 seconds after torpedoes hit. Target ob-
served to settle slightly by stern. He was still with tar-
get group three hours later.

Target draft Unknown Course 030°(T) Speed 7 knots Range 4500 y
(at firing)

OWN SHIP DATA
Speed 14.8 Course 190°(T) Depth Surface Angle 0°

FIRE CONTROL AND TORPEDO DATA
Type Attack:
Surface radar approach following end around from which
T.D.C. obtained base course and speed. Position taken 11000
yards off of base course. Headed in on true bearing, T.D.C.
and plot on P.R.T. coordinated information to check target
courses and speed S.J. radar using lobing. Tracking large
target in column heading in on true bearing for 100 port
track. Fired at 4500 yd range. Reversed course, heading
out on reverse true bearing. Sound bearings and ranges not
obtained. Conditions unfavorable.

(43)

— page 138 —
CONFIDENTIA L
TORPEDO ATT CK NO. 4

|                       | 4          | 3          | 2          | 1          |
| :| :| :| :| :|
| Tubes fired           | 4          | 3          | 2          | 1          |
| Track Angle           | 100 Port   | 100 Port   | 99 Port    | 99Port     |
| Gyro Angle            | 348        | 348.5      | 349.3      | 349.8      |
| Depth Set             | 6 feet     | 6 feet     | 6 feet     | 6 feet     |
| Power                 | High       | High       | High       | High       |
| Hit or Miss           | Hit        | Hit        | Hit        | Miss       |
| Erratic (yes or no)   | No         | No         | No         | No         |
| Mark Torpedo          | 23         | 23         | 23         | 23         |
| Serial No.            | 41577      | 53027      | 49803      | 49868      |
| Mark Exploder         | 6-4        | 6-4        | 6-4        | 6-4        |
| Serial No.            | 8238       | 12190      | 13254      | 8401       |
| Actuation Set         | Contact    | Contact    | Contact    | Contact    |
| Actuation Accual      | Contact    | Contact    | Contact    | Contact    |
| Mark War Head         | 16-1       | 16-1       | 16-1       | 16-1       |
| Serial No.            | 20877      | 20842      | 9746       | 11963      |
| Explosive             | Torpex     | Torpex     | Torpex     | Torpex     |
| Firing Interval       | -          | 9 sec      | 11 sec     | 12 sec     |
| Type Spread           | 1⁰ lft.    | 1⁰ rt      | 1⁰ lft     | 1⁰rt       |
| Sea Conditions        | Choppy     | choppy     | choppy     | choppy     |
| Overhaul Activity     | Sub Base   | Sub Base   | Sub Base   | Sub Base   |
|                       | P.H.T.H.   | P.H.T.H.   | P.H.T.H.   | P.H.T.H.   |
| Remarks               |            |            |            |            |

(44)

— page 139 —
CONFIDENTIAL

U.S.S. SEAL Torpedo Attack No. 5 Patrol No. 11
Time 0250 Date 9/9/44 Lat. 47-58 N Long. 148-20 E
(-10)

TARGET DATA - DAMAGE INFLICTED

Description: Large mast funnel mast ship. Plumb bow, coun-
ter stern, several decks in midship section,
high poop. Similar to KASIMA MARU (EU), page
29 of ONI 208-J(REV).

Ship(s) sunk: None

Ship(s) damaged or
probably sunk: As described above.

Damage determined by: Hits heard in four compartments and over
sound gear. Time of hits agreed with
torpedo runs. Heavy explosion from
direction of target 26 minutes after
firing.

Target draft Unknown Course 000T Speed 6.7 kts. Range 4200 yds.
(at firing)

OWN SHIP DATA

Speed 3.2 Course 069.5 Depth 60 feet Angle 10 down

FIRE CONTROL AND TORPEDO DATA

Type Attack: Surface radar approach followed by submerged
radar and periscope check before firing. Took position
ahead 12,000 yards following end around from which T.D.C.
obtained base course, zig zag plan and speed. Submerged and
radar tracked closing target track. Went to periscope depth
at 7000 yards crossed to target starboard track opening on
70 track for stern tubes, target on his left leg. 2 peris-
cope bearings checked generated bearings. Fired when range
was 4200 yards. Sound bearings and range not obtained condi-
tions unfavorable.

(45)

— page 140 —
CONFIDENTIAL

TORPEDO ATTACK NO. 5

                 5         6         7         8
Tubes fired      5         6         7         8
Track Angle      70 S      70 S      725       70 S
Gyro Angle       176.5     176.5     178       176.5
Depth Set        6 ft.     6 ft.     6 ft.     6 ft.
Power            -         -         -         -
Hit or Miss      Hit       Hit       Miss      Miss
Erratic (yes or no) No      No        No        No
Mark Torpedo     18-1      18-1      18-1      18-1
Serial No.       55549     55462     54977     55211
Mark Exploder    8-5       8-5       8-5       8-5
Serial No.       9598      8864      8796      8719
Actuation Set    Contact   Contact   Contact   Contact
Actuation Accual Contact   Contact   -         -
Mark War Head    18-2      18-2      18-2      18-2
Serial No.       2799      2716      2376      2843
Explosive        Torpex    Torpex    Torpex    Torpex
Firing Interval  -         12 sec.   13 sec.   10 sec.
Type Spread      1° rt.    1° lft.   1° rt.    1° lft.
Sea Conditions   Choppy    Choppy    Choppy    Choppy
Overhaul Activity Sub Base  Sub Base  Sub Base  Sub Base
                 P.H.T.H.  P.H.T.H.  P.H.T.H.  P.H.T.H.
Remarks
                 (46)

— page 141 —
CONFIDENTIAL

(I) MINES

Floating mines were sighted as follows:
Date | Time | Latitude | Longitude
Aug 19 | 0724(K) | 39-14 N | 147-47 E
Aug 29 | 1657(I) | 45-53 N | 145-51 E
Aug 29 | 1844(I) | 45-55 N | 145-40 E

Blew up first mine on Aug. 29 by 20 MM gunfire. Other
mines not sunk due to loosing contact in low visibility.

(J) ANTI-SUBMARINE MEASURES AND EVASION TACTICS.

Relatively few of the usual sampans were sighted in
area one.

Strong land-based radar is situated on both sides
of the eastern entrance of TSUGARU KAIKYO which, it is
believed, can pick up a submarine at 15 miles broadside
to.

The escort on September 5 was definitely just a heck-
ler and took no further action after dropping his first
charges.

Apparently we knocked out the only worthwhile escort
with the convoy on September 8. When seen through the
periscope later the other escort looked like one of our
PC boats. Convoy zigged 90° away after the two surface
attacks and ran for about 5 miles before starting around
slowly for the old base course.

Aircraft bombed us for ten hours after attack on
September 9. Their bombs sounded like they were set
shallow

Evasion made by standard methods.

(47)

Page No. 48 not used.

— page 142 —
CONFIDENTIAL

(K) MAJOR DEFECTS AND DAMAGE

ELECTRICAL

August 10
    Burned out starting resistance on #1 L.M.G. during
    chlorine drill, due to faulty operation by personnel.
    Replaced with 3 ohm resistor and cleaned contacts.

August 16
    Vernier Field rheostat on Auxiliary Generator ground-
    ed out, replaced with spare.

August 26
    Bow plane controller switch in control room grounded
    and burned up bakelite terminal block. Defective
    connections in block were by-passed by installing
    external switch.

August 28
    During operations #4 Main Motor parallel contactor,
    failed to make contact. Adjustment corrected fail-
    ure.
    V.C. still feed pump motor rheostat grounded out by
    S.W.; rheostat was by-passed because no spares aboard.

September 11
    While underway on #1 Main Engine, excessive sparking
    was noted on generator.

    Engine was stopped and inspection revealed following
    conditions: Oil had been thrown over inside of case,
    commutator was blackened and brushes were burned.

    Inside of generator was cleaned, commutator cleaned,
    brushes renewed, and generator placed back in commi-
    ssion.

    Stop. 0725. Start. 1440 Total. 7 hours, 15 minutes.

    Considerable trouble was encountered during entire patrol
    with electrical circuits on the bow and stern planes, caused
    primarily from loose contacts and connections, especially in
    the pilot circuits and carbon contacts.

    A battery discharge, at the 10 hour rate, was conducted
    enroute from patrol area to MIDWAY, followed by an equalizing
    charge.

(49)

— page 143 —
CONFIDENTIAL
ENCLOSURE (K) (CON'T)

MECHANICAL

August 9
                                Underway - found hole on housing of port hydraulic
                                clutch filling pump on #4 main engine.
                                Pump was replaced with new spare. T.E.H. 220.7
                                Stop. 1040 Start. 1445 Total. 4-05.

August 11
                                Replaced #3 injector on #1 Main Engine due to stick-
                                ing rack. T.E.H. 321.9 Changed during dive. Approx.
                                1 hour.

                                Upon starting #2 Main Engine after dive; smoke was
                                noted coming from forward end of engine. Stopped
                                and inspected and found following conditions:
                                Blower drive gear bushing and blower bushing (Upper
                                drive gear) both wiped.
                                All gears removed, clearances taken and other
                                bearings inspected, with no other unsatisfactory
                                conditions.
                                Bushings were renewed, engine tested and found O.K.
                                T.E.H. 221.9. Stop 1940 Start 0528 Total 9 hrs
                                48 minutes.

August 16
                                Found two inboard head studs on #6 cylinder of #3
                                Main Engine broken. Drilled out and renewed. T.E.H.
                                333.6. Stop 0300 Start. 1925, Total 14 hrs 25 min.

                                Underway enroute station. Found inboard head studs
                                on #2 and #8 cylinders of #4 Main Engine broken.
                                Drilled out and renewed. T.E.H. 332.8.
                                Stop 0526 Start. 1900 Total 13 hours and 34 min.

August 17
                                Noted F.W. pressure fluctuating on #4 main engine.
                                Pressure test revealed #6 cylinder liner cracked.
                                Replaced with spare. T.E.H. 351.2.
                                Stop. 1318 Start 1927 following day after dive.
                                Time for renewal approximately 11 hours.
                                Noted F.W. fluctuating on #3 Main Engine. Test revea-
                                led #11 cylinder liner cracked.
                                Replaced with spare. T.E.H. 355.7.
                                Stop. 0511 Start. 2000 Total. 14 hours 49 minutes.

(50)

— page 144 —
CONFIDENTIAL
ENCLOSURE (K) (CON'T)
MECHANICAL (CON'T)

August 27

          Noted F.W. pressure fluctuating on #4 Main Engine.
          Test revealed #11 cylinder liner cracked.
          Replaced with spare. T.E.H. 416.7.
          Liner was removed during idle engine period. Time
          for renewal approximately 6 hours.

September 1

          During routine inspection, found two inboard head
          studs on #14 cylinder head of #1 Main Engine broken.
          While renewing studs, inboard forward stud picked up
          metal causing the stripping of about half of the
          thread, in the block. Threads were cleaned up and
          stud replaced. T.E.H. 604.8. Eng. stopped 2238.
          Started 1219. Total time out of commission, 13 hrs.
          41 minutes.

September 7

          During routine bearing inspections found #11 connec-
          ting rod bearing of #2 main engine starting to flake.
          Replaced with new spare. T.E.H. 410.2

September 10

          During routine bearing inspection found #6 connect-
          ing rod bearing of #2 Main Engine starting to flake
          and had ¼" wide groove through both halves. Renewed
          same. T.E.H. 431.1.

September 12

          During engine operating period F.W. pressure was
          noted to be fluctuating on #1 Main Engine, indicating
          a cracked cylinder liner. Inspection revealed #11
          liner cracked. T.E.H. 725.5. Stop 0437 Start. 1047
          Total 6 hours and 6 minutes.

September 13

          Noted F.W. pressure fluctuating on #3 Main Engine.
          Test revealed #3 Cylinder liner cracked.
          No spares on board for renewal, so spare was taken
          from #1 cylinder on #1 main engine. T.E.H. 528.9.

September 14

          Upon surfacing after routine dive, #1 Main Engine
          was flooded while starting, (this failure is con-
          sidered entirely a personnel failure).

— page 145 —
CONFIDENTIAL
ENCLOSURE (K) (CON'T)
MECHANICAL
September 14 (Con't)

Engine will be out of commission until return to
base because of the following damage: 2 broken
cylinder liners on #4 and #8 cylinders.

COMMENTS ON ENGINEERING PERFORMANCE

This is the first War patrol of this vessel since a major
Navy Yard overhaul at MARE ISLAND and the usual post overhaul
failures and ironing out process was experienced. The next
patrol is expected to show a marked increase in engineering
efficiency.

The most frequent engine failures were cracked cylinder
liners and breaking of cylinder head studs.

In all five instances of cracked liners, the cracks were
very closely duplicated in size and location, and in three
instances on the same cylinder on three different engines #11.

All engine cylinder head nuts were checked and set after
the first failure and it is felt that this failure is caused
from faulty material rather than loose nuts as is generally
believed.

Continuous connecting rod bearing inspections were made
on random bearings, resulting in the renewal of three connec-
ting rod bearings which were just beginning to flake slightly
but to no alarming extent.

Engine performance was considered satisfactory with above
exceptions and until above are corrected, double allowance
of spare cylinder liners will be carried on board due to the
decommissioning of one main engine because of lack of spares.

During about 3/4ths of the patrol, it was necessary to
use the drain pump on the F.O. compensating system in order
to hold enough pressure for compensating fuel. (8-10" at 4
engine speed). It is suspected that some old cracks on #5,9
and 10 fuel ballast tank, main engine sea chests, have opened
up again.

Fuel was transferred from #9 and 10 to #11 and 12 normal
tanks, but it was not possible to isolate suspected tanks from
fuel group due to blank flanges in the vent risers.

Only one Main engine overhaul is contemplated during the
coming refit period plus a complete bearing inspection, Main
and con rods, on all engines.

(52)

— page 146 —
CONFIDENTIAL
ENCLOSURE (K) (CONT)
HULL

Automatic bypass valve on main hydraulic pump non-return
manifold stuck, not allowing pressure to build up when plant
was started. Poor alignment of piston suspected. Com-
plete spare manifold installed.

#1 periscope yoke found not in line with bearing surface
of periscope causing bind when periscope was trained. Excess-
ive forcing was noted on #1 scope also a slight blur resulted
from possible spot in optical system. #2 periscope fogged to
a lesser extent but the telemeter range lense would not return
to zero position. The fogging condition was probably due to the
low sea water temperature.

Steering pump in after torpedo room overheated and knocked
due to air in system additional air traps in lines to rams
are indicated.

(L) RADIO

Radio reception on the low frequency band, 16.68 Kc, was
of signal strength four in the daytime and unreadable at night
necessitating the use of high frequency bands; 4525, 6380,
9090, and 14,390 Kc most of the time. Reception on the latter
frequencies was good and no freak conditions were observed.

With only two high frequency receivers available, it was
impossible to guard 2880 Kc, Haiku Fox, and the aircraft fre-
quency called for in the C.O.P. when reception of Haiku Fox
on low frequency was impossible. Therefore it became necessary
to secure the aircraft frequency most of the time.

Nothing was heard on 2880 Kc, other than intermittent Jap
transmissions and occasional calls between our own aircraft.

Three messages were transmitted on station and in each
case they were transmitted twice blind to prevent undue link
of transmission. It is to the credit of P.E.M. that all three
messages were promptly receipted for.on the
schedule frequencies.

Unsuccessful attempts were made to use TBL voice trans-
missions on the inter-area frequency of 2880 Kc. when the
friendly submarine being called was an estimated 250 miles
away.

(53)

— page 147 —
CONFIDENTIAL
ENCLOSURE (L) (CON'T)
RADIO

The new rubber covered copper antenna lead-in cables in-
stalled during overhaul did not prove satisfactory because the
resistance to ground on each cable dropped to 40,000 ohms or
less. Before leaving for station the resistance was increased
by inserting sheets of plastic between the insulators about the
cable and the insulator supports. These cables will have to be
supported in a different manner or else replaced by a new insta-
llation entirely in order to prevent a reoccurrence of this
difficulty.

The 7 MC which caused considerably difficulty between MARE
ISLAND and PEARL HARBOR because of three burned out transfor-
mers and numerous opens as a result of poorly designed terminal
strips and single stranded connecting wire operated very sat-
isfactorily on patrol. Corrective measures taken prior to
departure for station were replacement of the burned out trans-
formers with one Kegron spare plus two comparable Thordarson
transformers. Additional terminal strips were made and mounted
in the 7 MC cans, and stranded wire was run from these strips
to the terminal strips in the unit, so that mechanical strain
on the single stranded wire between units was reduced to a
minimum.

(M) RADAR
SDa

The improvements, which included the installation of the
latest type antenna, incorporated in the SD during overhaul
reflected themselves in improved ranges, up to thirty-five or
more miles for high flying planes but the SD is still
inadequate for very low flying planes. Because of the possibi-
lity of DFing by the enemy, the SD was not used on station.

The only material damage was an internally shorted 9002
oscillator. Wiping off the antenna head with a clean
rag after leaving station resulted in improving the antenna
megger reading from 3,000 ohms to 3 megohms for each antenna
lead to ground.

I.F.F.

No use was made of the BN and ABK's on this patrol.

A.P.R. and S.P.A.

On station a continuous watch was kept on the APR and SPA
while on surface. These units were much more satisfactory
for obtaining data on enemy radar than any previously used
radar receivers, and the data obtained is incorporated else-
where in this report on the proper forms. On two occasions the
contacts received were believed to be planes and in this
respect a reversal of the Japs' practice with our SD proved
2

— page 148 —
CONFIDENTIAL
P.P.R.-1 AND SPA (CON'T)

valuable in preventing possible plane attack.

The sensitivity of the APR-1 was increased by changing
several tubes with the spares provided.

S.J.a

The increased height of antenna plus new wave guide, feeder
unit, range unit, P.P.I and slotted antenna made the S.J. a
much more valuable piece of gear than previously. Echos from
5000 feet mountains were received in the second sweep as was
checked by charging the pulse repetition frequency and the
estimated range of such large waves or boundries
probably from large waves or boundries
and was 120,000 yards. The increased
sensitivity caused some confusion by giving persistent echos
of different densities in the atmosphere. One unusual range
of 35,000 yards was obtained on a Russian ship and all contacts
was then lost from 33,000 yards until the range closed to
18,000. The slotted antenna eliminated side lobes to such an
extent that only slight minor lobes removed the confusion for-
merly encountered when tracking two or more ships.

The S.J.a reached its maximum value as a navigation aid,
search radar, and fire control radar in the area patroled because
of the normally reduced visibility. The irregular coastlines
and terrain of the islands made navigation by means of radar
bearings and ranges plotted on a plastic protractor as des-
cribed in March copy of SubronFour Information Bulletin a
simple matter.

There was one apparently ineffective attempt at radar
jamming as described on the proper form elsewhere in this re-
port.

In spite of careful adjustment during overhaul the S.J.
motor generator proved inadequate for the additional load
imposed upon it by the addition of the P.P.I and it was nec-
essary to use the I.C. motor generator supply almost exclusi-
vely in the P.P.I arced due to con-
densation in the unit and it is hoped that an alteration has
been authorized for the correction of this defect in design.
Other material failures were the failure of the time delay relay
in the control unit, a broken plastic tuning rod in the local
oscillator which was repaired temporarily by shaping and drill-
ing the remaining piece of plastic rod, a broken coax cable
from the S.J.I.A. (Sync pulse cable to main sweep multivi-
brator unit), routine replacement of
the S.J.I.A.T.R. tube, a gassy 2X2 tube in the indicator unit,
four gassy 5U4G's in regulated rectifiers A and B, and a bad
cathode ray tube in the indicator unit indicated by excessive
intensity on the oscilloscope. Total hours out of commission
for repairs was five.

(55)

— page 149 —
CONFIDENTIAL

(N) SOUND GEAR AND SOUND CONDITIONS

Sound conditions were very poor because of extreme nega-
tive temperature gradients encountered throughout the patrolled
areas. The JP-1 and JK were manned at all times while sub-
merged. Initial ranges on contacts were from 3,000 to 3500
yards, and final ranges 3500 to 4500 yards. At sometimes, the
JP-1 picked up the target more readily than the JK, and at other
time the JK picked up the targets more readily than the JP-1.

Considerable mechanical and electrical difficulty was ex-
perienced with the JK sound training and is yet unremoved
intermittent noise received with use of the QC sound head
prevented accomplishment of a ping range on a target.

(O) DENSITY LAYERS

TIME | DATE | LAYER DEPTH AND TEMP. AT TOP OF NEGATIVE GRADIENT | LAT & LONG
-----|------||
2005 | 9 Aug. 1944 | 125' at 76°F: | 26-15 N: 165-51 W:
1930 | 12 Aug. 1944 | 136' at 71°F: | 29-11 N: 179-48 E:
2055 | 17 Aug. 1944 | 136' at 60°F: | 37-05 N: 154-53 E:
1000 | 20 Aug. 1944 | 125' at 59°F: | 40-52 N: 142-38 E:
2100 | 20 Aug. 1944 | 136' at 70°F: | 41-09 N: 142-11 E:
2027 | 22 Aug. 1944 | 86' at 60°F: | 41-51.9N: 142-37 E:
0054 | 24 Aug. 1944 | 64' at 50°F: | 42-25.7N: 144-15 E:
2250 | 25 Aug. 1944 | 96' at 42°F: | 45-36.5N: 149-01 E:
0455 | 3 Sept. 1944 | 125' at 34°F: | 48-07 N: 146-29 E:
0800 | 9 Sept. 1944 | 135' at 36°F: | 47-56.9 N: 148-58 E:

Layer depth is depth from surface to top of a marked nega-
tive temperature gradient.

(P) HEALTH FOOD AND HABITABILITY

HEALTH - General health of the crew was excellent. One case
of acute enteritis ("322") occurred for a total of one (1)
sick day.

FOOD - In general was well prepared and palatable. The ice
cream maker proved to be excellent and is enthusiastically
endorsed for installation on all submarines.

HABITABILITY - was excellent due to the fine weather prevailing
for the most part. Surface patrolling made for plenty of fresh
air. Air conditioning plant was secured most of the time dur-
ing the latter part of the patrol, but moisture was never
excessive. No special winter clothing was taken aboard, re-
gular submarine clothing with waterproof parkas being entirely
adequate for this time of year. Marine field shoes, authori-
zed for advance bases, and "acquired" by this ship, are strong-
ly recommended for this type patrol. They are warm and not
too bulky.

(56)

— page 150 —
(Q) PERSONNEL.

1. (a) No. of men on board during patrol - 76
   (b) No. of men qualified at start of patrol - 42
   (c) No. of men qualified at end of patrol - 53
   (d) No. of men advanced in rating this patrol - 10

2. A vigorous training program for the qualification of
   men and officers was adopted. Not book standards were raised
   and in addition a departmental check off card, initialled by
   a leading petty officer of each compartment was required of
   each unqualified man prior to examination by a qualified officer.

3. Performance of personnel, both officers and crew, was of
   the highest standards.

(R) MILES STEAMED - FUEL USED.

Pearl Harbor to Midway. | 1220 Miles | 15,494 Gallons
Midway to area. | 2228 Miles | 23,731 Gallons
In area. | 4353 Miles | 35,708 Gallons
Area to Midway | 2023 Miles | 22,253 Gallons

(S) DURATION

Days enroute to area. | 11
Days in area. | 22
Days enroute to base. | 8
Days submerged. | 11

(T) FACTORS OF ENDURANCE REMAINING

TORPEDOES | FUEL | PROVISIONS | PERSONNEL
          |      |             | FACTOR

1         | 14,000 Gal. | 20 days | 20 days.

Limiting factor this patrol - TORPEDOES.

(57)

— page 151 —
CONFIDENTIAL
(V) RADIO AND RADAR COUNTER MEASURES

Date 20 August 1944Report No.1

INTERCEPTION OF ENEMY RADAR TRANSITIONS.

1. Ship or Station U.S.S. SEAL

2. Area covered on this mission (give dates) Vicinity of 41-00N,
   142-00E

3. Was enemy radar: Shipborne _ Airborne _ Landbased X
   Unknown

4. Intercept Equipment AN/AT-141/APR-1 with AN/SPA-1 analyzer &
   TN2/APR1 .

5. (a) Frequency 99 Mc Dial Readings 6.6
   (b) PRF 400 to 500 C.P.S.How Measured SPA
   (c) Pulse width 18 micro secs. How Measured SPA
   (d) Sketch Pulse
   [HANDWRITTEN: (simple sketch of a single pulse waveform)]

   (e) Was lobe switching _ Rate _ How Deter. _
   (f) Polarization of enemy signal _
   (g) Sweep Rate Nodefinite rate.
6. (a) Was radar used for surface or air search, _, SLC, GCI,
   or AI. Surface
   (b) Evidence for this conclusion Radar trained on us for
   7 minutes.
7. Action of enemy radar, including distances and bearings at
   which searched, tracked, faded, etc. Modulated CW was
   keyed as radar in code which was or the most part unintelligable. strong signal when 25 miles
   from shiriya Saki and faded out at 46 miles there from.

8. Narrative:

(58)

— page 152 —
CONFIDENTIAL

Date 22 August 1944Report No. 2

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or Station U.S.S. SEAL

2. Area Covered on this mission (give dates) Position at time
   of reception : 42-00N 141-28 E.

3. Was enemy radar: Shipborne Airborne Landbased X Unk.

4. Intercept Equipment MT-141/PAR-1 with AN/SPA-1 analyzer and
   TN2/APR1

5. (a) Frequency 158.5 Deal Readings 14.0
   (b) PRF 600 How Measured SPA
   (c) Pulse Width 14.5
   (d) Sketch Pulse
   [SKETCH: A drawing of a pulse shape, roughly rectangular with a slight rise and fall]

   (e) Was Lobe Switching Used - Rate - How Deter. -
   (f) Polarization of enemy signal -

6. (a) Was radar used for surface or air search, CL, SLC, GCI,
   or - Surface.

   (b) Evidence for this conclusion Radar full on us for 2 M

7. Action of enemy radar, including distances and bearings at
   which searched, tracked, faded, etc. Strong signal received
   off and on for 40 min. (Approximate range to ESEN SYKI,
   25 Miles.

8. Narrative:

(59)

— page 153 —
CONFIDENTIAL

Date 23 August 1944 Report No. 3

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or Station U.S.S. SEAL

2. Area Covered on this mission (give dates) POSIT. 41-57 N
   142-36 E.

3. Was enemy radar: Shipborne ___ Airborne ___ Landbased X
   Unknown

4. Intercept equipment: MT-141/APR-1 with AN/UPA-1 analyzer and
   AN/APR-1

5. (a) Frequency 90 Mc. Deal Readings
   (b) PRF 1000 How Measured SPA
   (c) Pulse Width 8.5 How Measured SPA
   (d) Sketch Pulse

   (e) Was lobe switching Used - Rate - How Deter. -
   (f) Polarization of enemy signal -
   (g) Sweep Rate -

6. (a) Was radar used for surface or air search: GL, SLC, CCI,
   or AI.
   (b) Evidence for this conclusion -

7. Action of enemy radar, including distances and bearings at
   which searched, tracked, faded, etc. Very weak signal.
   Apparently being trained at random. Signal observed for
   about 10 minutes prior to submerging.

8. Narrative:

(60)

— page 154 —
CONFIDENTIAL
Date 23 August 1944 Report No. 4

INTERCEPTION OF ENE Y RAD R TRAN I SSIONS

1. Ship or Station U.S.S. SEAL

2. Area covered on this mission (give dates) Position 41-31.5 N
   142-56 E.

3. Was enemy radar: Shipborne Airborne Landbased X Unk.
   (a) Describe enemy installation
   _

4. Intercept Equipment T-141/APR-1 with AN/SPA-1 analyzer and
   TN-2/APR-1.

5. (a) Frequency 99 Mc Dial Reas 6.6
   (b) PRF 350-850 How Measured SPA
   (c) Pulse Width 20 sec. How Measured SPA
   (d) Sketch Pulse:
   _

   (e) Was Lobe Switching Used - Rate - How Deter -
   (f) Polarization of enemy signal -
   (g) Sweep Rate -

6. (a) Was radar used for surface or air search, GL, SLC, GCI, AI.
   (b) Evidence for this conclusion. -

7. Action of enemy radar, including distances and bearings at
   which he searched, tracked, faded, etc. Weak signal of vary-
   ing amplified and P.R.F. observed for about one hour.

8. Narrative:

(61)

— page 155 —
CONFIDENTIAL

Date 23 August 1944 Report No. 5

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or Station U.S.S. [HANDWRITTEN: SEAL]

2. Area covered on this mission (give dates) Position 41-33.5 [HANDWRITTEN: N] 143-15.3 E

3. Was enemy radar: Shipborne_ Airborne_ Landbased X Unk._
   (a) Describe enemy installation. [HANDWRITTEN: -]

4. Intercept Equipment [HANDWRITTEN: MT-141/APR-1] with [HANDWRITTEN: AN/SPA-1] analyzer and [HANDWRITTEN: AN/APR-2]

5. (a) Frequency [HANDWRITTEN: 100] Mc
   (b) PRF [HANDWRITTEN: 750]
   (c) Pulse Width [HANDWRITTEN: 15] per Sec
   (d) Sketch Pulse:
     [HANDWRITTEN: (drawing of a pulse shape)]
     Dial Readings [HANDWRITTEN: 6.7]
     How Measured [HANDWRITTEN: SPA]
     How Measured [HANDWRITTEN: SPA]

   (e) Was lobe switching used [HANDWRITTEN: -] Rate [HANDWRITTEN: -] How Deter [HANDWRITTEN: -]
   (f) Polarization signal [HANDWRITTEN: -]
   (g) Sweep Rate [HANDWRITTEN: -]

6. (a) Was radar used for surface or air search, GL, SLC, CCI, AI.
   (b) Evidence of this conclusion [HANDWRITTEN: -]

7. Action of enemy radar, including distances and bearings at which he searched, tracked, faded, etc. [HANDWRITTEN: Signal observed for about 10 minutes.]

8. Narrative:

(62)

— page 156 —
CONFIDENTIAL

Date 24 August 1944 Report No. 6

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or Station U.S.S. SEAL

2. Area covered on this mission (give dates) Position 41-45 N
   143-44.5 E .

3. Was enemy radar: shipborne Airborne Landbased X Unk.
   (a) Describe enemy installation -

4. Intercept Equipment IT-141/APR-1 with AN/PA-1 analyzer and
   AN/TN-2/APR-1

5. (a) Frequency 75 MC Dial Readings 1.5
   (b) PRF 500 How Measured SPA
   (c) Pulse Width 4.0 micro sec. How Measured SPA
   (d) Pulse Sketch:
     [SKETCH: a waveform drawing]
   (e) Was lobe switching used - Rate - How deter. -
   (f) Polarization of enemy signal -
   (g) Sweep Rate -

6. (a) Was radar used for surface or air search, GL, TIC, CCI.
   (b) Evidence for this conclusion.

7. Action of enemy radar, including distances and bearings at
   which he searched, tracked, faded, etc: Signal received
   for about 50 minutes.

8. Narrative:

(63)

Page No. 64 not used

— page 157 —
CONFIDENTIAL

Date 25 August 1944Report No. 7

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or Station U.S.S. SEAL

2. Area covered on this mission (give dates) Position 43-06.1 N
   136-17.1 E.

3. Was enemy radar: Shipborne Airborne Landbased X Unk.

   (a) Describe enemy installation

4. Intercept Equipment IT-141/APR-1 with AN/SPA-1 analyzer and
   TN-1/APR-1.

5. (a) Frequency 75 Dial Readings 1.5
   (b) PRF 500 How Measured SPA
   (c) Pulse Width 30 micro sec. How Measured SPA
   (d) Sketch Pulse: [HANDWRITTEN: a small sketch of a pulse waveform]

   (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, CCI, AI.
   (b) Evidence for this conclusion.

7. Action of enemy radar, including distances and bearings at
   which he searched, tracked, faded, etc. Signal received off
   and on for 8 hours.

8. Narrative:

(65)

— page 158 —
CONFIDENTIAL
Date 25 August 1944 Report No. 8
INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or Station U.S.S. SEAL

2. Area covered on this mission (give dates) Position 43-55 N
   147-58.2 E.

3. Was enemy radar: Shipborne ___ Airborne ___ Landbased X ___ Unk. ___
   (a) Describe enemy installation

4. Intercept Equipment AN/APR-1 with AN/SPA-1 analyzer and
   AN-2/VPR-1

5. (a) Frequency 152 Mc Dial readings 14.2
   (b) PRF 100 How Measured SPA
   (c) Pulse Width 10 micro sec How Measured SPA
   (d) Sketch Pulse:
   [HANDWRITTEN: (drawing of a pulse)]
   [HANDWRITTEN: Very Round Pulse]

   (e) Was Lobe Switching used: ___ Rate ___ How Deter ___
   (f) Polarization of enemy signal ___
   (g) Sweep Rate ___

6. (a) Was radar used for surface or air search, GL, SLC, GCI, I.
   (b) Evidence for this conclusion ___

7. Action of enemy radar, including distances and bearings at
   which he searched, tracked, faded, etc. [HANDWRITTEN: Signal received
   weakly three times in about thirty second with 10 minutes be-
   tween indicating a sweep rate of one revolution per 10 min.]

8. Narrative:

(66)

— page 159 —
CONFIDENTIAL

Date 4 Sept. 1944 Report No. 9

INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or Station U.S.S. TEI

2. Area covered on this mission (give dates) Position 47-18 N
   151-03 E

3. Was enemy radar: Airborne Airborne landbased Unt.
   (a) Describe enemy installation

4. Intercept equipment used AN/APR-1 with AN/SPA-1 analyzer
   TN2/APR-1

5. (a) Frequency 147 Mc Dial 13.7
   (b) PRF 750 How Measured SPA
   (c) Pulse Width 15 micro sec How Measured SPA
   (d) Pulse Sketch:
   [PULSE SKETCH: A square wave pulse is drawn]

   (e) Was lobe switching used Rate How deter.

   (f) Polarization of enemy signal

   (g) Sweep Rate

6. (a) Was radar used for surface or air search, GL, SLC, CCI, AI.
   (b) Evidence for this conclusion

7. Action of enemy radar, including distances and bearings at
   which searched, tracked, faded, etc.

8. Narrative: Noted for only a few seconds.

(67)

— page 160 —
CONFIDENTIAL

Date 6 September 1944 Report No. 10
INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or Station U.S.S. SEAL

2. Area Covered on this mission (give dates) Position 46-35 N
   150-29 E

3. Was enemy radar: shipborne Airborne Landbased X Unk.
   (a) Describe enemy installation

4. Intercept Equipment AN/APR-1 with AN/SPA-1 analyzer and
   AN/APR1

5. (a) Frequency 76 Mc Dial Readings 2.5
   (b) PRF 550 How Measured SPA
   (c) Pulse Width 25 micro sec How Measured SPA
   (d) Sketch Pulse:
   [HANDWRITTEN: Sketch of a waveform showing a small pulse immediately followed by a larger pulse, with this pattern repeating after a short interval.]

   (e) Was lobe switching used Rate How deter.

   (f) Polarization of enemy signal

   (g) Sweep Rate

6. (a) Was radar used for surface or air search, GL, SLC, CCI, AI

   (b) Evidence for this conclusion

7. Action on enemy radar, including distances and bearings
   at which searched, tracked, faded, etc. Contact for 50
   minutes trained on us for 10 minutes otherwise trained at
   random

8. Narrative:

(68)

— page 161 —
CONFIDENTIAL

Date 8 Sept. 1944 Report No. 11

INTERCEPTION OF ENEMY RADAR TRANSMISSION

1. Ship or Station U.S.S. SEAL

2. Area Covered on this mission (give dates) Position 46-09 N
   147-10.5 E

3. Was enemy radar: Shipborne Air borne X landbased Unk.
   (a) Describe enemy installation

4. Intercept equipment AN/APR-1 with AN/SPA-1 analyzer and
   AN/APM-1

5. (a) Frequency 152 Dial Readings 14.2
   (b) PRF 330 How Measured SPA
   (c) Pulse Width 10 micro sec How Measured SPA
   (d) Sketch Pulse:
   [HANDWRITTEN: (sketch of a pulse waveform)]

   (e) Was Lobe Switching Used Rate How Deter.

   (f) Polarization of enemy signal

   (g) Sweep Rate

6. (a) Was radar used for surface or air search, GL, TC, CCI, AI.

   (b) Evidence for conclusion

7. Action of enemy radar, including distances and bearings at
   which searched, tracked, faded, ect. Signal came on stro-
   ngly for two minutes and then off completely. We dove.

8. Narrative:

(69)

— page 162 —
CONFIDENTIAL
Date 8 Sept. 1944. Report No. 1
JAMMING OF OUR RAD'R BY THE ENEMY
ELECTRONICALLY OR BY REFLECTORS WINDOWS ETC.

1. Ship or Station U.S.S. SEAL (SS183)
2. Position and altitude when jammed 47-10.9 N 148-23.5 E.
3. Date 8 September 1944 Time: from 1936 to 1940
4. Radar Model Jammed SJ Freq. 10 c.m.
5. Location of enemy jammer Shipborne X Airborne land-
   based Unknown
6. Give range of target:
   (a) when jamming was first noted 16,000 yds
   (b) when jamming was effective
   (c) when target was observed through jamming signal

7. Describe jamming pattern observed on the CRT, and sketch.
   [HANDWRITTEN: These Traveled] [HANDWRITTEN: (sketch of jamming pattern)] across Sweep
   [HANDWRITTEN: Negative Deflection]
   [HANDWRITTEN: (sketch of jamming pattern)] [HANDWRITTEN: (sketch of jamming pattern)]
   [HANDWRITTEN: Normal Prec. Sweep]

8. Did the enemy appear to be using a monitoring receiver with
   a look-thru arrangement.

9. (a) Was the enemy using barrage jammin, spot jamming, or
   reflectors
   (b) Effectiveness Not very effective
   (c) If window was recovered, describe

10. If windows or other reflectors were used,
    (a) at what range bearing and altitude were they released.
    (b) What was rate of movement Course rate ( )
    (c) What was force and direction of wind.

11. What countermeasures were taken to reduce effectiveness of
    jamming Jamming did not appear on main or expanded sweep.
    These sweeps were used until the jamming ceased

12. Narrative: The apparent attempt at jamming was observed
    for only several minutes and at no time later in our attack
    on the convoy.

(70)

— page 163 —
CONFIDENTIAL
(V) REMARKS

          Eight Mk 18, Mod. 1 torpedoes were carried Aft. on this
patrol, all of which were fired, obtaining two hits. Due to
the type attacks the torpedo runs were considered long for this
type torpedo, ranging from 3500 yards for the first torpedo fir-
ed on the first electric torpedo attack, to 3960 yards for the
last torpedo fired on the second electric torpedo attack. The
injection temperature during the period on station averaged 50°F
making the upkeep of the torpedoes an almost effortless task;
but, however, decreasing the advisable firing range and speed
of the torpedoes.

          On August 5th the Eight Electric Torpedoes were taken
aboard, recieved from the Submarine Base Torpedo Shop, Pearl
Harbor, T.H. with a complete allowance of spare parts. All
torpedoes were checked thoroughly and no defects were found.
The four torpedoes put in the tubes had Mk 10-1 war heads and
number seven handhole on the port side. The four torpedoes
put in the racks had Mk 18-2 warheads, and had number seven
hand hole on top in line with the other 6 handholes. This
placing of the handholes proved to be a great advantage for
changing the torpedoes in the racks. No troubles were en-
countered on inserting the charging plug through the newly
placed number seven hand hole.

          No special routine was followed in charging the torpedoes
except for routine four day check overs on all torpedoes.
Freshening charges were given when the gravity had dropped
between 10 to 15 points below the final gravity of the previous
charge. While still in warm temperatures each torpedo had to
be charged at the end of five days, but in the area eight
days elapsed before a charge was needed. Also in cooler cli-
mate less time was needed to complete a charge. Each torpedo
was vented twenty-four hours after a charge and every forty-
eight hours thereafter.

          On one occassion a charge was secured on the torpedoes in
tubes seven and eight because of an enemy contact. Later the
charge was continued and no trouble was encountered. On ano-
ther occassion the tubes were made ready to fire and remained
that way for about thirty minutes. After securing from battle
stations each torpedo was pulled and given a thorough checking.
All conditions were very satisfactory and the torpedoes were
replaced in the tubes.

          On September 4th all torpedoes in the tubes were given a
freshening charge and on the next day an enemy contact was
made. The torpedoes were vented just prior to going to
battle stations. Injection temperature was about 54°F. The
four electric torpedoes in the tubes were fired during the
attack, but none of them hit. The torpedo runs were 3600,
3570, 3540 and 3500 yards respectively. Gyro angles were
18.7 left, 18 left, 16.7 left and 16 left. The speed set
on the Torpedo Data Computer was 28 knots. Depth set was five
feet.

(71)

— page 164 —
CONFIDENTIAL

(V) REMARKS (CON'T)

The J.K. sound gear followed the screws out on their true
course for about two and a half minutes, when they could
no longer hear them due to poor sound conditions in the area.
All torpedoes apparently ran hot, straight and normal. The
remaining torpedoes were loaded in the tubes.

On September 7, all torpedoes were given a freshening
charge and in the early morning of the 9th all four tubes
were fired. Two hits were heard obtained with the torpedo
runs of all four between 3900 yards and 3760 yards. The
gyros were set at 3.5 left and 2 left. The speed used for
torpedoes on T.D.C. was 28 knots depth set was 6 feet. It
was assumed that the two torpedoes set to hit by the spread
were the ones that hit.

All Mk 18, Mod. 1 torpedoes were fired while submerged at
approximately 63 feet. Impulse pressure was 225 pounds.
Both attacks were made at night in phosphorescent waters,
thereby probably nullifying this type torpedoes greatest
advantage of leaving no wake. Two of its disadvantages,
that of a short firing range and slow speed, were great
hindrances to the type of attacks most frequently used in
this area.

The upkeep of Mk 18, Mod. 1 torpedoes was less trouble
than Mk 14 or Mk 23 torpedoes, due chiefly to periodic
thorough checkings, thereby not allowing any part to get
out of condition. The hydrogen burning circuits functioned
correctly at all times. No coils, bulbs or shunts had to
be replaced during the entire period.

An ammeter was installed in each torpedo room with a
selector switch to the hydrogen burning circuit of each tube,
thereby facilitating the taking of amperages of each circuit
and reducing the time down to about 30 seconds for a complete
reading on all torpedoes. A selector switch was installed
also, on the transformer, whereby the volts could be changed
quickly and easily. This work was accomplished in Mare
Island Navy Yard.

(72)

— page 165 —
CONFIDENTIAL
(V) REMARKS (CON'T)

FRIENDLY TRAFFIC

Russian shipping uses the winter route during the summer
months. Traffic was heavy. All Russians were well marked
with bright lights at night, well defined side markings
and flag hoists in the daytime. One ship was encountered
which appeared to be constantly helming. Other than the time
and fuel lost making end arounds on these ships, no difficulty
was encountered.

ENEMY TRAFFIC

Single ships are believed to run up the lea of the KURIL
ISLAND chain at this time of year.

The routing of the convoy encountered is believed to
have been 065 from LA PEROUSE to the vicinity of 47°N 148°E.
and then to ARAIDO.

San pan traffic along the island chain is heavy.

(73)

— page 166 —
SUBMARINE SQUADRON TWENTY

FC5-20/A16-3/A9
Serial: 0156

CONFIDENTIAL

From: The Commander Submarine Squadron TWENTY.
To : The Commander in Chief, U. S. Fleet.
Via : (1) The Commander Submarine Force, Pacific Fleet,
Subordinato Command, Navy No. 1504.
(2) The Commander Sub arine Force, Pacific Fleet.
(3) The Commander in Chief, U.S. Pacific Fleet.

Subject: U.S.S. SEAL (SS183) - Report of Eleventh War
Patrol.

1. The Eleventh War Patrol of the SEAL was conducted
in Area One and the KURIL ISLANDS. It was terminated because
of torpedo expenditure after a period of 40 days, 22 of which
were spent in the assigned areas. This was the first patrol
for the Comanding Officer as such. The areas were well
covered in accordance with a carefully planned schedule and
contacts were aggressively attacked.

2. ATTACKS:

Attack #1. This was a surface radar approach
conducted during daylight while concealed by a surface fog.
Three Mark 23 torpedoes were fired from the bow tubes at 1400
yards range, 110 track, with 3 foot depth settings. Two hits
were heard and large oil and bank debris was soon to be hurled
several hundred foot in the air. Disappearance of the radar
pip less than four minutes later at a range of 2800 yards
indicates that this ship sank.

Attack #2. Following a 6½ hour pursuit and ond-
around, a submerged night periscope attack was conducted
against a 4000 ton ship with one escort. Four Mark 18-1 tor-
podocs were fired from the stern tubes at a range of 3500 yards
but all missed due to a control error. SEAL then went deep
to escape a counter attack and was unable to subsequently
locate the target.

Attack #3. This was a night surface radar attack
following a nine hour ond-around. Four bow torpedoes were
fired at overlapping targets, run 3200 yards, 80 track, 6 foot
depth settings, and all hit. A FUBUKI Class DD and a medium
size AK were sunk and another AK was stopped and set afire

- 1 -

— page 168 —
SUBMARINE SQUADRON TWENTY
19 September 1944

FC5-20/A16-3/A9
Serial: 0156
CONFIDENTIAL
Subject: U.S.S. SEAL (SS183) - Report of Eleventh War
Patrol.

— page 169 —
COMMANDER SUBMARINE FORCE, PACIFIC FLEET,
SUBORDINATE COMMAND, NAVY NO. 1504.

A16-3/A9 Care of Fleet Post Office,
San Francisco, California.
Serial: 0158 21 September 1944.

C-O-N-F-I-D-E-N-T-I-A-L
SECOND ENDORSEMENT to
U.S.S. SEAL(SS183) -
Report of Eleventh War
Patrol.

From: The Commander Submarine Force, Pacific Fleet,
Subordinate Command, Navy No. 1504.
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. SEAL(SS183) - Report of Eleventh War
Patrol.

1. Forwarded, concurring in the remarks contained in
the first endorsement, with the exception of the analysis of
Attack Number 5. Evidence of damage on this attack is not believed
to be very strongly supported. The explosions heard may well have
been end of run explosions.

2. The Commanding Officer, Officers and men of the
U.S.S. SEAL are further congratulated for the damage inflicted
on the enemy.

[SIGNATURE: J. M. WILL]
J. M. WILL.

— page 170 —
FF12-10/A16-3(15)/(16) SUBMARINE FORCE, PACIFIC FLEET [HANDWRITTEN: mr]
Serial 02093 [STAMP: RECEIVED S-C FILES] are of Fleet Post Office,
CONFIDENTIAL [HANDWRITTEN: 23C Room 2055] San Francisco, California,
26 September 1944.

THIRD ENDORSEMENT to [HANDWRITTEN: ROUTE TO:] 13 OCT 1944 NOTE: THIS REPORT WILL BE
SEAL Report of [HANDWRITTEN: Op File No. (SU) 216-3/23/2217] DESTROYED PRIOR TO
Eleventh War Patrol. [HANDWRITTEN: Rec. No. -----138868-----] ENTERING PATROL AREA.
[HANDWRITTEN: Copy No. ]
COMSUBSPAC PATROL REPORT NO. 53 [HANDWRITTEN: 2ND Copy]
U.S.S. SEAL - ELEVENTH 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. SEAL (SS183) - Report of Eleventh War Patrol.
(8 August to 17 September 1944).

1. The eleventh war patrol of the SEAL was conducted in
the Kurile Islands Area.

2. The patrol was well planned and conducted in an aggres-
sive, alert manner. Despite considerable thick weather and numerous
encounters with Russian shipping, three enemy contacts were made and
five aggressive attacks delivered.

3. This patrol is designated as "Successful" for Combat
Insignia Award.

4. The Commander Submarine Force, Pacific Fleet, congra-
tulates the commanding officer, officers and crew for this aggressive,
highly successful patrol. The SEAL is credited with having inflicted
the following damage upon the enemy during this patrol:

S U N K

1 - Unidentified - 2,000 tons (Attack No. 1)
1 - DD (FUBUKI Class) (EU) - 1,700 tons (Attack No. 3)
1 - Medium AK (EU) - 4,000 tons (Attack No. 3)

TOTAL SUNK - 7,700 tons

D A M A G E D

1 - Medium AK (EU) - 4,000 tons (Attack No. 3)
1 - Large AK (TANGO MARU Typo) (EU) - 6,900 tons (Attack No. 4)
1 - Large AK (KASIMA MARU Typo) (EU) - 9,900 tons (Attack No. 5)

TOTAL DAMAGED - 20,800 tons
[HANDWRITTEN: 224] TOTAL SUNK & DAMAGED - 28,500 tons
[STAMP: FLEET MAINTENANCE OPERATIONS OCT 14 1944 RECEIVED DEPARTMENT]

Authentication and distribution,
on following page.

[SIGNATURE: C. A. LOCKWOOD, Jr.]

- 1 -

— page 171 —
FF12-10/A16-3(15)/(16) SUBMARINE FORCE, PACIFIC FLEET
Serial 02093
Care of Fleet Post Office,
San Francisco, California,
CONFIDENTIAL 26 September 1944.

THIRD ENDORSEMENT to NOTE: THIS REPORT WILL BE
SEAL Report of DESTROYED PRIOR TO
Eleventh War Patrol. ENTERING PATROL AREA.

COMSUBSPAC PATROL REPORT NO. 534
U.S.S. SEAL - ELEVENTH WAR PATROL.

Subject: U.S.S. SEAL (SS183) - Report of Eleventh War Patrol.
(8 August to 17 September 1944).

— page 172 —
SS183/A16-3
Serial (011)
CONFIDENTIAL
[STAMP: DECLASSIFIED]

U.S.S. SEAL(SS183)

Care of Fleet Post Office,
San Francisco, California.

29 November 1944.
[STAMP: DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C]
BY [HANDWRITTEN: 0109/ott] DATE [HANDWRITTEN: 6/15/72]

From: Commanding Officer, U.S.S. SEAL(SS183).
To : Commander-in-Chief, UNITED STATES FLEET.
Via : (1) Commander Submarine Division FORTY-FOUR.
      (2) Commander Submarine Squadron FOUR.
      (3) Commander Submarine Force, PACIFIC FLEET.

Subject: U.S.S. SEAL(SS183) - Report of War Patrol
         Number TWELVE.

Enclosure: (A) Subject Report.
           (B) Track Chart of patrol (ComSubSPac only).
           (C) Data required by ComSubSPac Conf.
               Ltr. FF12-10/A16-3(9)/(16) of April 10, 1944.

           1. Enclosure (A), covering the TWELFTH War Patrol
of this ship conducted in the KURILE ISLANDS AREA during the
period October 10, 1944 to November 29, 1944, is forwarded
herewith.

JOHN H. TURNER.

[HANDWRITTEN: FILMED]
[HANDWRITTEN: 99726]

— page 176 —
CONFIDENTIAL U.S.S. SEAL - REPORT OF TWELFTH WAR PATROL

October 17 (Cont'd)
1720(L) Secured SD radar for remainder of patrol.
1856(L) Stopped starboard shaft due to knocking in steady
          bearing, caused by loose holding-down studs. Will
          require about 12 hours to repair so decided to spend
          tomorrow submerged to repair same. (See part K.)
1950(L) Going ahead on both shafts with starboard "a thumpin"

October 18
0716 Received ComSubPac 171817.
0749(L) Submerged running across the outer convoy route to
          continue repairs on starboard shaft.
          All times unless otherwise indicated are KING.
1727 Surfaced. Proceeding to ETOROFU KAIKYO on three
          engines.
2007 Radar contact on URUPPO TO 75,000 yards, bearing 347°
          T.
2350 Transiting ETOROFU KAIKYO. Took a look in MOYORO
          WAN; nothing there.

October 19
0119 Completed transit of ETOROFU KAIKYO. Commenced
          surface patrol across northern entrance of the strait.
0520 Submerged for patrol off northwest tip of ETOROFU
          JIMA and across northern entrance of ETOROFU KAIKYO.
1236 Sighted LILY type plane, bearing 335° T, distance
          1 mile. (AIRCRAFT CONTACT #1).
1737 Surfaced and headed up along traffic lane to westward
          of URUPPO TO, rounding BUROTON TO and heading for
          southwest tip of SHIMUSHIRO TO.
2157 Received ComSubPac 190208.

October 20
0544 Submerged for patrol off southwest tip of SHIMUSHIRO
          TO.
0910 Set course 050°T to run up west coast of SHIMUSHIRO T.
1720 Surfaced. Set course for outer convoy routes.

ENCLOSURE (A) -4-

— page 177 —
CONFIDENTIAL U.S.S. SEAL - REPORT OF TWELFTH WAR PATROL

October 21
0700 Set course 036°T to run up convoy route.
1130 Received ComSubPac 210029.
1306 C/c to 215°T to run down convoy route.
1700 C/c to 156°T to head for TSURIGANE WAN on URUPPO TO.

October 22
0536 Submerged off southern entrance to TSURIGANE WAN,
     patrolling this spot all day. No contacts.
1748 Surfaced. Ran down west coast of URUPPO TO to
     southern tip of the island then reversed course for
     TSURIGANE WAN.

October 23
0529 Submerged off southern entrance to TSURIGANE WAN.
1030 Sighted sampan headed south close along coast, range
     8000 yards.
1406 Sighted sampan headed south close along coast, range
     7000 yards.
1745 Surfaced. Set course 330°T for outer convoy lane.

October 24
1214 C/c to 035°T running up the outer convoy route.
     Uneventful.

October 25
     Running up the outer convoy route towards PARUMUSHIRO
     on base course 035°T.
0556 Radar contact bearing 090°T, range 18,000 yards.
     Commenced tracking. (SHIP CONTACT #1. ATTACK #1.
     ONE FREIGHTER SUNK. POSIT LAT. 50-17.6N LONG 150-50.2E)
0615 Target is running down the convoy lane away from
     us. Target commenced end around to westward; target
     not in sight due to morning haze. There is some doubt
     whether this is a Russian or a Jap, only one pip on
     the radar. Tracking at 15,000 yards indicates he is
     zigging. End around somewhat complicated by force
ENCLOSURE (A) five sea from
     -5-

— page 183 —
CONFIDENTIAL U.S.S. SEAL - REPORT OF TWELFTH WAR PATROL

November 5 0108 (Cont'd)
recognition signals to a radar or lookout station on the
beach. Didn't want to test him out. Appeared to be fly-
ing at about 2000 feet or higher. Probably a transport
trip from the Empire.

0209 Surfaced.

0533 Submerged for patrol across southern approaches to
HARUMUKOTAN KAIKYO.

1730 Surfaced, heading down the island chain. The snow
covered islands up here are quite pretty in the bright
moonlight. One doesn't appreciate them very much though
with icy spray continually in the face and numb hands
and feet after fifteen minutes on the bridge.

November 6

0248 A.P.R. Contact on 107 megacycles on MATSUWA TO.

0531 Submerged to take another look in the anchorage at
MATSUWA and to take pictures of the installations there.

1400 Nothing in the anchorage; started taking pictures from
position lat. 48-03.2 N., long. 153-25.4 E. Objects
photographed included gun positions, hangars, shops,
and living quarters around the airfield. One silver
colored TOPSY on the airfield.

1737 Surfaced. Numerous lights around the airfield but no
search lights. Heading south along the island chain.

November 7

0455 A.P.R. contact 75 megacycles believed to be on MINAMI
JIMA.

0603 Submerged for patrol of northeastern tip of URUPPO TO.

0632 Sighted trawler in very close to beach north of KOMBO
SE heading north along the coast. Commenced approach.
(SHIP CONTACT #4).

0656 Trawler rounded the tip of URUPPO TO between URUPPO TO
and HIRA JIMA. He was running along the coast along the
ten fathom curve, making a great deal of smoke. Hoped
this was a traffic route so started coasting along
URUPPO TO to southward.

ENCLOSURE (A)
-11-

— page 197 —
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— page 201 —
CONFIDENTIAL U.S.S. SEAL - REPORT OF TWELFTH WAR PATROL

(L) RADIO (Cont'd)

          Material casualty was shorted windings in RF
     coil of RAL-1 caused by a strong 355 Kc signal which
     arced across the protective relay contacts. This was
     probably due to the inherent length of our antennae and
     the protective relays were not of proper design to withstand
     the strong signal.

          Serials 72Z of 15 Nov. and 98L of 20 Oct. were
     missed. No use was made of the inter area frequencies
     or the aircraft frequency, 4475 Kc, although signals
     were observed from other areas.

(M) RADAR

     A. SJ-a

          This gear operated with a minimum of casualties
     this run and was again used for navigation as well as search
     and fire control.

          Material casualties were the A scope in the
     indicator unit which gave poor focus, two 5U4G tubes
     in the Regulated Rectifier which caused a low output
     voltage, R44 and R45 in the PPI unit caused the 40,000
     Yd. and 80,000 Yd. sweeps to start halfway out from the
     center of the scope and were replaced, and R5 in the PPI
     unit caused a short 40,000 Yd. sweep and were replaced.

     B. SD

          The SD was used only to and from station. There
     were several material casualties in the indicator unit
     caused by salt water getting into the receiver but other-
     wise operation was satisfactory for an SD.

          It is suggested that the present lower limit
     switch on the vertical antenna be replaced by a drum type
     switch similar to the recent alteration on the periscope
     hoists in order to obtain more reliable operation and thus
     better protection for the vertical antenna and associated
     cables.

     C. IFF

          No use was made of the IFF equipment this run.

ENCLOSURE (A)

                                        -29-

— page 205 —
SUBMARINE DIVISION FORTY-FOUR

FB5-44/A16-3

Serial 0119

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

FIRST ENDORSEMENT to
USS SEAL Report of
TWELFTH WAR PATROL.

From: The Commander Submarine Division FORTY-FOUR.
To : The Commander-in-Chief, United States Fleet.
Via : (1) The Commander Submarine Squadron FOUR.
(2) The Commander Submarine Force, Pacific Fleet.
(3) The Commander-in-Chief, U.S. Pacific Fleet.

Subject: U.S.S. SEAL (SS183) Report of Twelfth War Patrol.

1. The twelfth war patrol of the U.S.S. SEAL was conducted in the
KURILE ISLAND Area, and was of fifty days duration, thirty of which were spent
in the assigned area.

2. During this patrol the SEAL made two contacts worthy of torpedo
attack and numerous contacts on neutral merchantmen. The first contact, 25
October 1944, was on a medium escorted new AK of about 5,000 to 6,000 tons.
The second contact on 13 November 1944, was on a medium AK. Both these escorted
targets were successfully attacked by torpedoes. Three hits out of four torpedoes
fired were obtained on the first target and one hit obtained out of four torpedoes
fired on the second target.

3. FIRST TORPEDO ATTACK - This was a day periscope attack following
a radar contact after an end-around in a heavy sea. Two Mark XIV and two Mark
XXIII torpedoes were fired, on a 102 degree track, 2900 yards, gyros from
14 to 20 degrees. Three hits were obtained and the target was observed to sink.

SECOND TORPEDO ATTACK - This was a day periscope attack in which
target was first sighted at range of 4000 yards. Four Mark XVIII torpedoes were
fired with small angle gyro at 120° track, torpedo run about 900 yards, depth
setting eight feet. One hit was obtained. The SEAL was forced to go deep upon
completion of firing due to the proximity of the escort. Target screws stopped
immediately after the hit and characteristic breaking-up noises followed by a
loud explosion were heard. A thorough search of the area two hours later failed to locate either the target or the escort.

4. The SEAL returned from patrol in fair materiel condition. The
maloperation of the Main Ballast Tank vents and heating up of the starboard steady
bearing will be investigated. Repair will be accomplished by the Submarine Base in
the normal time and defects will be corrected.

5. The officers and crew of the SEAL are heartily congratulated on the
completion of a very arduous patrol and upon the damage inflicted on the enemy.

[SIGNATURE: JESSE L. HULL C]
JESSE L. HULL C

— page 206 —
SUBMARINE SQUADRON FOUR 11/hls
Fleet Post Office,
San Francisco, California,
3 December 1944.

FC5-4/A16-3
Serial 0507
C-O-N-F-I-D-E-N-T-I-A-L
SECOND ENDORSEMENT to
USS SEAL (SS183) Report
of Twelfth 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, United States Pacific
Fleet.

Subject: U.S.S. SEAL (SS183) Report of Twelfth War Patrol.

1. Forwarded, concurring in the remarks of Commander
Submarine Division FORTY-FOUR.

2. The Commander Submarine Squadron FOUR congrat-
ulates the Commanding Officer, officers, and crew of the U.S.S.
SEAL upon completion of a strenuous patrol, and for the damage
inflicted upon the enemy.

3. It is recommended that the U.S.S. SEAL be cred-
ited with the following:

SUNK
1 - AK(EU); 6,000 tons
1 - AP(EU); 4,000 tons
Total Sunk 10,000 tons

[SIGNATURE: W. V. O'Regan]
W. V. O'REGAN.

— page 207 —
FF12-10/A16-3(15) SUBMARINE FORCE, PACIFIC FLEET
Serial 02784
Care of Fleet Post Office,
CONFIDENTIAL San Francisco, California,
13 DEC 1944 9 December 1944.
THIRD ENDORSEMENT to NOTE: THIS REPORT WILL BE
SEAL Report DESTROYED PRIOR TO
Twelfth War Patrol. ENTERING PATROL AREA.

COMSUBSPAC PATROL REPORT NO. 594
U.S.S. SEAL - TWELFTH 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. SEAL (SS183) - Report of Twelfth War Patrol.
(10 October to 29 November 1944).

1. The twelfth war patrol of the SEAL was conducted in the
Kuriles Islands Area. This was the SEAL's second successive patrol in
this region.

2. In spite of severe winter weather, snow storms, and
heavy seas the SEAL maintained excellent area coverage. Most of the
contacts made were with Russian shipping; however, the two enemy con-
tacts made were aggressively and successfully attacked by the SEAL.

3. The peculiar radar activity was undoubtedly caused by
the heavy amount of St. Elmo's fire prevalent during this period.

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

5. The Commander Submarine Force, Pacific Fleet, congratu-
lates the commanding officer, officers, and crew for this aggressive
and successful war patrol. Congratulations are also offered to this
fine submarine on its outstanding career in this war, which is now
terminated as the SEAL retires to training services. The SEAL is cre-
dited with having inflicted the following damage upon the enemy:

S U N K
1 - Large Freighter (EC) 6,000 tons (Attack No. 1)
1 - Medium Freighter (EU) 4,000 tons (Attack No. 2)
TOTAL SUNK 10,000 tons

C. A. LOCKWOOD, Jr.

DISTRIBUTION:
(Complete Reports)
Cominch (7) ComsubsoWespac (2)
CNO (5) CTG 71.9 (2)
Cincpac (6) Comsopac (1)
Intel.Con.Pac.Ocean Areas (1) Comsubpac (40)
Comservpac (1) SUB.D. MI (2)
Cinclant (1) ComsubspacSubordcon (3) [SIGNATURE: C. A. Lockwood, Jr.]
Comsubslent (8) All Squadron and Div. (2)
S/M School, NL (2) Commanders, Pacific (2) [SIGNATURE: E.L. HYNES, 2nd]
CO, S/M Base, PH (1) Subtrainpac (2)
Comsopac (2) All Submarines, Pacific (1) Flag Secretary
Comsowespac (1)

— page 208 —
4-6 March 1940
CROSS INDEX CARD

TEST REPORT

Report of ASW sound detecting tests in Puget Sound area
in company with SNAPPER.

Separately as PROCESSED COPY under SNAPPER

SEAL
5
8 March 1940

DATE 10 Aug-2 Oct 1942
FROM CO - USS SEAL

NAME SEAL
SERIAL none
DATE none

SUBJECT Supplementary War Patrol Report
Report of enemy contacts & attacks on patrol off Indo-
China coast.

(SOWESPAC: SUB OPS)
FILED: War Diary

Separately
as Enc. to TG 51.1 ser S-0064 of 6 Oct 42

MICROSERIAL NO. | ACTION REPORT OPNAN FORM 3480-13 (11-55) B-36862

DATE 5-6 July 1943
FROM CO - USS SEAL(SS-198)

NAME SEAL
SERIAL
DATE

SUBJECT SUBMARINE ACTION REPORT

Two reports of torpedo firings on SEVENTH WAR PATROL. Claim
no damage to enemy in attacks on shipping off Northern
HONSHU.

(CENPAC: SUB OPS)
FILED: War Diary

Separately as ORIGINAL

MICROSERIAL NO. | ACTION REPORT OPNAN FORM 3480-13 (11-55) B-36862

— page 209 —
DATE 17 September 1943
FROM CO - USS SEAL (SS-183)
                                                                NAME    SEAL
                                                                SERIAL  none
                                                                DATE    5 October 1943
SUBJECT SUBMARINE ACTION REPORT, Forwarding of
Forwards (to COMINCH) report of torpedo firing on EIGHTH
WAR PATROL. Claims no damage to enemy in action off
SAKHALIN Island.
(NORPAC: SUB OPS)
FILED: War Diary

Separately as ORIGINAL

MICROSERIAL NO.
                                                                ACTION REPORT OPNAV FORM 3480-13 (11-55)
                                                                                                        B-28682
                                                                                                                    A

DATE 17 September 1943
FROM CO - USS SEAL (SS-183)
                                                                NAME    SEAL
                                                                SERIAL
                                                                DATE
SUBJECT SUBMARINE ACTION REPORT
Torpedo firing report for EIGHTH WAR PATROL. Claims no
damage to enemy in action off SAKHALIN Island.
(NORPAC: SUB OPS)
FILED: War Diary

Separately as Enc.to SEAL no ser of 5 Oct 43

MICROSERIAL NO.
                                                                ACTION REPORT OPNAV FORM 3480-13 (11-55)
                                                                                                        B-28682
                                                                                                                    A

DATE 17 Nov-15 Dec 1943
FROM CO - USS SEAL (SS-183)
                                                                NAME    SEAL
                                                                SERIAL  none
                                                                DATE    20 December 1943
SUBJECT Special Mission
Detailed and full report of photographic reconnaissance
of KWAJALEIN Atoll 17 Nov-15 Dec 1943.
(COMINCH: US SUB OPS)
FILED: War Diary

Separately as ORIGINAL

MICROSERIAL NO.
                                                                ACTION REPORT OPNAV FORM 3480-13 (11-55)
                                                                                                        B-28682
                                                                                                                    A

— page 210 —
FF4/dn/COPY / 3-26-40
SS185/S68
U.S.S. SNAPPER
wrh
At Sea
Serial C-5
March 8, 1940.
[STAMP: DECLASSIFIED]
[HANDWRITTEN: je]
From: The Commanding Officer.
To : Bureau of Engineering.
Bureau of Construction and Repair.
Naval Research Laboratory, Bellevue, D.C.

Subject: Sound Tests Conducted in Puget Sound.

1. During the period 4 through 6 March the USS
SNAPPER and USS SEAL conducted sound tests with Battery 14,
C.A.C., at Fort Worden, Washington. Various runs were made
with the two listening stations maintained by the Army, such
as: Submarines on surface on battery-motor combination; one
submarine submerged with one on surface on battery-motor;
both on surface on battery-motor; both on surface, one on
battery-motor and one on diesel drive; and both on surface
on diesels. Runs were made at night as well as during day-
light. Advantage was made of passing vessels and on one
night practice a U.S. Coast Guard vessel and an eight-hun-
dred ton Navy tug were used to run interference for the sub-
marine attempting to pass the listening stations.

2. In order to get a relative comparison between
the equipment used in submarines and that being experimented
with by the

— page 211 —
FF4/COPY / dn / 3-26-40

SS185/S68
-2-
U.S.S. SNAPPER
At Sea
wrb
Serial C-5
March 8, 1940.

CONFIDENTIAL
From: The Commanding Officer.
Bureau of Engineering.
Bureau of Construction and Repair.
Naval Research Laboratory, Bellevue, D.C.

Subject: Sound Tests Conducted in Puget Sound.

4. The hydrophones used were in the sonic range so
that many of the sounds were practically identical with ship-
board noises, and as such could be recognized and identified
almost immediately.

5. During each run made, the listeners at the hydro-
phone stations were able to pick out the sound characteristic of
a submarine. Listeners with only ten to twelve hours experience
could readily detect the presence of a submarine by its charac-
teristic sound, and the two supervisors, with several years of
experience, could not only detect the submarine but also could
obtain bearings on noises produced in different parts of the same
submarine. Various auxiliaries throughout the ship made noises
audible over the hydrophones as shown in enclosure "A". Even
with one and two ships running interference for the submarines
the characteristic noise could be picked up when the submarine
was running as slow as possible (36 r.p.m.). An idea of the
sensitivity of the apparatus can be had when it is known that a
ferry boat crossing about five miles South of the hydrophones
creates minor interference. On the practice in which the
SNAPPER anchored and listened to the SEAL, Coast Guard vessel
and Navy tug, it was possible to tell that there were three
vessels in the vicinity but it was not possible to single each
one out as it was with the fixed hydrophone. However, some of
the difficulty might be explained by the high noise level incident
to the location near the shore.

6. From the results obtained it would seem that the
only means for a submarine to pass through a channel fitted with
similar hydrophones would be to float through with the tide with
practically all auxiliaries stopped, and without blowing or vent-
ing at all, as a small amount of air bled into a tank creates a
loud roar in the hydrophones. It is the most pronounced sound
made by a submarine.

/s/ F.O. JOHNSON.

Copy to:
Comsubfor,
Comsubron 6,
Comsubdiv 15,
CO, Fort Worden, Wash.
CinC, USF
ENCLOSURE (A)

— page 212 —
SS185/S68
Serial C-5
CONFIDENTIAL

FF4/an/COPY/ 3-26-40
U.S.S. SNAPPER
At Sea

wrb

March 8, 1940

Sound Tests Conducted in Puget Sound

The results obtained by the Army were so surprising that
the Commander of this Task Group obtained permission to con-
duct a special test to determine just what equipment could be
heard when it was in operation, and what their comparative
intensities were. The results are tabulated in table below.

Conditions at time of test were:

SNAPPER approximately 3000 yards from hydrophone.
SEAL approximately 1500 yards from SNAPPER.
Water calm, wind light, sky overcast, tide slack to 1/2
knot ebb.
Submarines on surface.

Equipment started : Heard over : Heard by:
on SNAPPER         : hydrophones : SEAL : Comments

Main and auxiliary:
power cut out;all :
machinery stopped : No        : No   : Dead quiet.
                    :           :      :
Safety flood valve:           :      : Valve heard opening
opened by hand    : Yes       : No   : and water rushing
                    :           :      : to tank. Heard plain-
                    :           :      : ly. Very loud. Heard
                    :           :      : through interference
                    :           :      : of passing tug's pro-
                    :           :      : pellers.
                    :           :      :
Started #1 light- : No        : No   : Tug interference.
ing motor genera- :           :      :
tor.                :           :      :
                    :           :      :
Started #2 light- :           :      : Faint hum resembling
ing motor genera- : Yes       : Yes  : the characteristic
tor.                :           :      : sound of a submarine
                    :           :      : heard.
                    :           :      :
Started #1 and #2 : No        : No   : Dead quiet.
I.C. motor genera-:           :      :
tor.                :           :      :

                    -1- ENCLOSURE (A)

— page 213 —
SS185/S68                               FF4/dn/COPY / 6-26-40
Serial C-5                               U.S.S. SNAPPER
                                         At Sea
                                                               wrb
CONFIDENTIAL

                     Sound Tests Conducted in Puget Sound

Equipment started : Heard over   : Heard
on SNAPPER          : hydrophones  : by SEAL : Comments

Started hydraulic   : Yes          :         : Characteristic rhythm
pump.               :              :         : of relatively high
                    :              :         : frequency. (Start and
                    :              :         : stop could not be
                    :              :         : heard; but once up to
                    :              :         : speed, could be heard).

Ran battery venti-  : Yes          : No      : Picked up sound, low
lation blowers.     :              :         : hum gradually in-
                    :              :         : creasing in speed
                    :              :         : and volume. Very evi-
                    :              :         : dent when stopped.

Steering motor to   : Yes          : Yes     : Clattering noise on
hydraulic pump      :              :         : starting, steady hum
started.            :              :         : when up to speed.
                    :              :         : Rudder heard when
                    :              :         : moved.

Stern plane motor   : Yes          : No      : When stern planes
cut in.             :              :         : were moved contact
                    :              :         : could be heard when
                    :              :         : they cut in.

Started ice         : Yes          : Yes     :
machines and air    :              :         :
conditioning        :              :         :
machine.            :              :         :

Started trim pump   : Yes          : Yes     :

Safety tank vent    : Yes          : Yes     : Loud rumbling noise,
closed by hand,     :              :         : very plain. Could
Tank blown.         :              :         : hear vent being closed
                    :              :         : over hydrophones.

Started low pres-   : Yes          : Yes     : Sound identical with
sure blower         :              :         : shipboard noise, very
                    :              :         : loud and plain.

-2-                                        ENCLOSURE (A)

— page 214 —
FT4/dn/COPY/ 3/26/40

SS185/S68
Serial C-5
CONFIDENTIAL

U.S.S. SNAPPER
At Sea

wrb
March 8, 1940.

Sound Tests Conducted in Puget Sound

Equipment started : Heard :
on SNAPPER : Hydrophones : by SEAL : Comments

— page 215 —
**** FF4/dn / COPY / 3-26-40 ****
SS185/S68                                         U.S.S. SNAPPER                                wrb
Serial C-7                                        At Sea

CONFIDENTIAL

                                                  March 8, 1940.

From:             The Commanding Officer:
To :              The Commander-in-Chief, U. S. Fleet.
Via :             (1) The Commander Submarine Division FIFTEEN.
                  (2) The Commander Submarine Squadron SIX.
                  (3) The Commander Submarine Force, U.S. Fleet.

Subject:          Minor Joint Army and Navy Exercises.

                  1.    During the period 4 through 6 March the USS
SNAPPER and USS SEAL conducted sound tests in Puget Sound
Area in conjunction with Battery 14, C.A.C., U.S. Army.

                  2.    Attached is a summary of the exercise with
the results obtained.

                  3.    The Commander of this Task Group was in-
formed that the Army's report of the exercise was to be in
the hands of the War Department within the week, and to
provide the Naval Research Laboratory with a report im-
mediately copies were forwarded direct to the Departments
concerned.

                  4.    A copy to the Commanding Officer, Fort
Worden, Washington, was forwarded direct.

                                                  /s/ F. O. JOHNSON.

                                                  ENCLOSURE (A)

— page 216 —
[HANDWRITTEN: 716-3]
COMDESRON 41
[STAMP: RECEIVED
APR 9 1940]
[HANDWRITTEN: FF4/S68]

Serial C-218

CONFIDENTIAL

From: Commander Submarine Force.
To : SUBMARINE FORCE.

Subject: Report of Minor Army and Navy Exercises,
Puget Sound Area.

Enclosure: (A) CO SNAPPER Conf. ltr., SS185/S68, Serial
C-7 with summary of exercise attached.

1. A comprehensive and interesting report of anti-
submarine sound detecting methods used by the Army as reported
by the Commanding Officer, U.S.S. SNAPPER, is transmitted here-
with as enclosure (A).

DISTRIBUTION:
List I, Case 2, M-O.
B5-0,B5-50,Q1,Q10, (10 each).

[SIGNATURE: C. W. Wilkins]
C. W. WILKINS,
Flag Secretary. [HANDWRITTEN: Comdesron 41 (10)
Dallas]

UNITED STATES FLEET
SUBMARINE FORCE
U.S.S. RICHMOND, Flagship
dn
San Diego, California,
29 March, 1940.

W. L. FRIEDELL.

— page 217 —
[STAMP: DECLASSIFIED]
SUBMARINES, SOUTHWEST PACIFIC
U. S. S. SARGO (SS188) Flagship

SUPPLEMENTARY WAR PATROL REPORT

U.S.S. SEAL - PERIOD FROM AUGUST 10, 1942, TO OCTOBER 2, 1942

1. The SEAL was directed to conduct an offensive war
patrol against enemy combatant, supply, and transport shipping
in the area between latitude 8°-30' S. and 12°-00' North, to the
coast of INDO-CHINA on the west and to the DANGEROUS GROUND on
the east.

2. Enemy Contacts.

2017, August 18, In latitude 5°-13' S., longitude 117°-21'
1942. E., an unidentified ship believed to have
been either a destroyer or small cruiser.
Unable to close range, made no attack.

1700, August 20, In latitude 3°-10' S., longitude 118°-38'
1942. E., a patrol vessel of the TIDORI class on
course 180° True, speed 8 knots. Made no
attack.

2316, August 21, In latitude 0°-19' S., longitude 119°-11'
1942. E., a destroyer on course 040° True, speed
11 knots. Lost sight of enemy at about 6000
yards and unable to relocate; made no attack.

1635, September 1, In latitude 10°-38' N., longitude 109°-09'
1942. E., a convoy of five AK's escorted by two
destroyers, on course 225° True, speed 10
knots. Three of these ships were combination
freighter-passenger types; the other two,
well deck freighters. One, similar to
AWATA MARU, was attacked and believed
damaged.

1435, September 2, In latitude 11°-11' N., longitude 109°-02'
1942. E., the masts and stack of a coastal steamer
on a southwesterly course. Made no attack.

1327, September 3, In latitude 11°-23' N., longitude 109°-06'
1942. E., a passenger-freighter of about 4000 tons
on course 210° True, speed 10 knots. Made
a successful attack, obtained one hit and
target beached herself in FANRANG BAY.

- 1 -

— page 218 —
S-E-C-R-E-T
                                                                SUBMARINES, SOUTHWEST PACIFIC

                                                                U. S. S. SARGO (SS188) Flagship

                                                        SUPPLEMENTARY WAR PATROL REPORT

                                        U.S.S. SEAL - PERIOD FROM AUGUST 10, 1942, TO OCTOBER 2, 1942

                                2.      Enemy Contacts (continued).

        0135, September 5,              In latitude 10°-39' N., longitude 109°-32'
                1942.                   E., a freighter of about 5000 tons similar
                                        to KOYADA MARU on course 240° True, speed
                                        12 knots. Made an unsuccessful attack.

        1143, September 6,              An AK of about 4000 tons, anchored about
                1942.                   three miles west of HON DO in the
                                        north end of FANRANG BAY. Made no attack.

        1512, September 6,              In latitude 11°-28' N., longitude 109°-09'
                1942.                   E., an armed auxiliary of about 7000 tons
                                        on course 030° True, speed 10 knots, es-
                                        corted by a TIDORI class torpedo boat.
                                        Made no attack due to a periscope casualty
                                        near firing bearing.

        0250, September 7,              In latitude 11°-20' N., longitude 109°-32'
                1942.                   E., two TIDORI class torpedo boats or
                                        other type patrol vessels on course 210°
                                        True, speed 7 knots. Made no attack.

                                3.      Attacks Made.

        (1) September 1, 1942.          Fired a four torpedo spread at a freighter-
                                        passenger ship of about 7300 tons, similar
                                        to KAWATA MARU, range 7000 yards. This
                                        was one ship of a five AK convoy, escorted
                                        by two destroyers. Due to excessive range
                                        and destroyer depth charge attack, results
                                        were not observed and no damage is probable.

        (2) September 3, 1942.          Fired one torpedo at a 4000 ton passenger-
                                        cargo ship, range 690 yards, observed hit
                                        35 seconds later. Ship beached herself
                                        in north end of FAN RANG BAY, near BASSE
                                        NOUVELLE.

        (3) September 5, 1942.          Fired a three torpedo spread at a 4000 ton
                                        freighter, similar to KOYADA MARU, range
                                        2000 yards. One torpedo exploded pre-
                                        maturely 500 yards from SEAL's bow, so tar-
                                        get avoided remainder. No hits were obtained.

                                        - 2 - (End).

— page 219 —
[HANDWRITTEN: 8 MP # SAKHALIN]
SS183/A16
WP8

[HANDWRITTEN: 3.]
U.S.S. SEAL (SS183)

c/o Fleet Post Office
San Francisco, Calif.

5 October 1943.

C O N F I D E N T I A L
[HANDWRITTEN: CONFIDENTIAL (struck through)]

From : The Commanding Officer.
To [HANDWRITTEN: X]: The Commander in Chief, United States Fleet.

Subject : Confidential U.S. Submarine Action Report -
forwarding of.

Reference: (a) Pacific Fleet Confidential Letter 36CL-42.
Enclosure:[HANDWRITTEN: X] (A) Subject Report. (1 copy)

1. Enclosure (A) is forwarded herewith in accordance
with reference (a).

[SIGNATURE: H.B. Dodge]
H.B. DODGE

[STAMP: Reg. No. [HANDWRITTEN: 20191]]
[STAMP: C.F. No. [HANDWRITTEN: 10 01606]]

[STAMP: COMMANDER IN CHIEF
U.S. FLEET
RECEIVED
1943 OCT 21
8 29]

— page 220 —
CONFIDENTIAL

U. S. SUBMARINE ACTION REPORT

U. S. S. SEAL (SS183) Date: 17 September 1943
Time 1318 G.C.T. Location: Latitude 40-00 N.
Longitude 145-50 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.

[HANDWRITTEN: 10]
[HANDWRITTEN: 160]

Weather conditions Sky partially overcast.
Sea conditions Moderate - slightly choppy
Sound conditions (if applicable) Poor
Type of operations Submerged patrol in area.

Specific objective Destroy Japanese war ships and shipping

Forces engaged: Own One submarine

(Name and Type) Enemy Target - "AKAGISAN MARU" class, smaller freighter
and escort of 1 class minesweeper.

Type of attack (own enemy—scratch one) Submerged periscope attack with
torpedoes.

Brief description Gained position on starboard bow of target. Fired a
spread of 4 torpedoes from forward tubes on a 120 starboard track.

Weapons employed:
Own Torpedoes
Enemy 4 depth charges.
Ammunition expended 4 MK 14-5A torpedoes with MK 16 warheads (torpex)
equipped with MK6 exploder mechanism.

— page 221 —
CONFIDENTIAL

Evasive tactics employed:
    Own Maneuvered at deep submergence.
    Enemy None observed.
For Torpedo Attack (Own):

    Firing range 750 Yds.

    Keel depth 50 ft.
    Straight/4 shot(s)
    Type spread Modified longitudinal                               Periscope and TDC
    Attack: (check) [CROSSED OUT: Periscope and TDC] (opposed by close screen      Periscope and TDC
    Detected: (check) [CROSSED OUT: Periscope and TDC] (after firing               Periscope and TDC
Results: (Certain) No damage to enemy.

(Estimated

Damage to own ship None

Lookout (s) or special equipment detector operator(s):

                            (Name)                  (Rate)                  (ServiceNo.)
    made initial contact by Sight (sound) (radar), (SMSD), (MAD), (Sight)
Brief Remarks Cause for mission undetermined.

— page 222 —
[HANDWRITTEN: From Box # 128 (1-40 Series) a.e.u]
SS183/A16-3
WP-9

[STAMP: DECLASSIFIED]
[STAMP: SECRET]

U.S.S. SEAL (SS183)
% FLEET POST OFFICE
SAN FRANCISCO, Calif.

[HANDWRITTEN: 18 SEP 1952]
[HANDWRITTEN: Original 133]

[HANDWRITTEN: 11699]

20 December 1943.

From : The Commanding Officer, U.S.S. SEAL.
To : The Commander Submarine Force, Pacific Fleet.

Subject : Photographic Reconnaissance of Kwajalein Atoll.

1. The subject report is forwarded herewith.

2. The report consists of nine (9) sections as follows:

Section 1 -- Descriptive Data.
Section 2 -- Shipping and Anchorages.
Section 3 -- Aircraft Activity.
Section 4 -- Navigational Aids and Currents.
Section 5 -- Weather.
Section 6 -- Sketches.
Section 7 -- Charts.
Section 8 -- Photographic Log.
Section 9 -- Photographs, consisting of negatives
             and prints of 59 rolls of still pictures,
             one roll of undeveloped still pictures,
             one roll of undeveloped motion pictures.

[SIGNATURE: H.B. Dodge]
H.B. DODGE.

— page 223 —
SS183/A16-3
WP-9

S-E-C-R-E-T

SECTION I

Descriptive Data

1. Submerged reconnaissance of Kwajalein Atoll was conducted
during the period 17 November to 15 December, 1943. Of the 96
islands comprising the atoll 88 were observed and 56 were photo-
graphed. Attempts to obtain photographs of the islands at the
important entrances, namely Ennylabegan, Gea, Mellu and Ennuebing
Islands, were frustrated by patrol boats which were encountered
on each occassion.

2. The islands will be considered in order clockwise from Roi
Island. For convenience, unnamed islands will be assigned a letter.

Roi Island

Descriptive looks at Roi were limited in order to permit a max-
imum number of photographs to be taken. Both still and motion
pictures were taken.

Roi is low with a sandy beach and scattered palm trees on the
eastern half. One antiaircraft gun was seen near western end of
island. Two radar installations were seen close together near
western end of island. (Just to left of clump of trees on photo
59-5). These installations were of the bedspring type and quite
low as compared to our own similar installations. There are two
large hangars at the eastern end of the island. These appeared to
be of wood construction. Two towers were observed which are vis-
ible in photographs.

Namur Island

Namur is connected to Roi by a causeway. The island is com-
pletely covered with trees.

Many low buildings were seen through the trees in the middle
of the island.

There is a tower at about the middle of the island and one
building was seen near the southern tangent.

Photographed.

Ennugarret Island

Completely wooded.

Narrow beach.

No installations visible.

Photographed.

(1)

— page 225 —
SS183/A16-3
WP-9
S-E-C-R-E-T                                                              SECTION I
                                                                         Descriptive Data

— page 227 —
SS183/A16-3
WP-9

S-E-C-R-E-T

Eniwetakku Island
    Completely wooded.
    No installations.
    Not photographed.

Meck Island
    Completely wooded.
    A triangular tower is located at each end (northern and
    southern tips) of the island.
    No other installations observed.
    Not photographed.
    Two triangular channel markers are located about 1500 yards
    east of pass between Kwadack and Meck Islands. Approximate position
    shown on chart.

Bigej Island
    Completely wooded.
    Practically no beach.
    A mast is located on the northern tip and a vertical marker on
    the southern tip.
    No other installations observed.
    Photographed.

North Gugegue Island
    Large island completely wooded.
    Practically no beach.
    No installations visible.
    Photographed.

(5)
SECTION I
Descriptive Data

— page 230 —
Kwajalein Island (cont-)
There are two towers on the island which show clearly in the
photographs.
A large white building with a dome was seen near the western end
of the island on the lagoon side.
It was difficult to make out buildings from seaward due to
foliage.
See sketch.
Photographed.
Enubuj Island
Wooded.
Practically no beach.
Two radio towers are located on the island. These towers were
determined, by stadimeter ranges, to be 260 feet high above sea level.
One large building and two small buildings are situated between
the towers.
About twelve vertical masts extending just above the tree tops
were observed in the vicinity of the radio station.
After sunset, lights could be seen from windows of radio station
at a distance of five miles.
Ennylabejan Island
Completely wooded.
Practically no beach.
No installations observed.
Not photographed due to patrol boat activity.
Note that the island reported between Ennylabegan and Enubuj
was not seen. It is possible that the reef may be visible at that
spot at low water.
(8)

— page 232 —
Okay, I understand. You're looking for a transcription of the text from the image. I will provide that now.

Here is the transcription:

SS183/A16-3
WP-9

S-E-C-R-E-T

— page 243 —
SS183/A16-3
WP-9

                                                                SECTION 2
                                                        Shipping and Anchorages

S-E-C-R-E-T

        1. Shipping was observed at Kwajalein in the area
outlined on the Target Detail Map.

        Naval vessels anchored on the southwestern side of this
area.

        One ship was observed alongside the lagoon side of Ebeye
Island at the southern end.

        All shipping observed entering Kwajalein anchorage used
Gea Pass. The approach was made on course approximately 080°.

        A constant daylight patrol is apparently maintained off
Gea Pass.

        No shipping was observed at anchor near Roi.

        One vessel of approximately the same type as our PC boats
was observed underway in the Roi anchorage.

        Patrols were twice encountered in the vicinity of North Pass.

        One small vessel (200 tons) was observed inside the lagoon
near Edgigen Island.

        On two successive days, a small vessel was seen crossing
Bigej channel to the northward inside the lagoon. No shipping was
seen passing in or out through this channel.

— page 244 —
SS183/A16-3
WP-9

SECTION 3
Aircraft Activity

S-E-C-R-E-T

Seaplanes were observed on several occasions taking off from
the lagoon near Ebeye Island.

No aircraft activity was observed in the vicinity of Ennylabegan
Island.

Numerous two engine bombers were observed going in for landings
on Roi Island.

On several nights observed searchlight beam directed straight
up from vicinity of Roi.

— page 245 —
SS183/AN6-3
WP-9

SECTION 4

Navigational Aids and Currents

S-E-C-R-E-T

Some islands had vertical markers erected at their extremities.
These are listed in the description.

Two triangular markers were seen about 1500 yards to the east-
ward of the pass between Meck and Kwadack Islands. The approximate
position is shown on the chart.

All piloting was done by means of tangents which plotted in well.

About 0300 on 15 December, Gellinam Island was approached to
within five miles at night. About one hour after diving for morn-
ing twilight, a patrol boat was seen astern. Shortly thereafter,
the patrol boat stopped and started pinging. The position seemed
rather unusual for patrol boat activity and suggested that they may
have been tracked by radar from Omelek, Kwadack or Meck Islands.

On the western side of the atoll the currents were found to
vary with the tides.

West and north of Mann Island the current was found to average
about 330°, 0.7 knots on the ebb, reversing on the flood.

Southwest of Gea Pass the current averaged 300°, 0.6 knots on
the ebb, with the reverse on the flood.

On the eastern side of the atoll the current sets generally
northeast, 0.8 knots. Close inshore near Namur Island, a current
of 2.6 knots, setting northward parallel to the coast, was exper-
ienced.

A strong southerly current parallel to the coast was experienced
off Bigej Island. Just south of Bigej channel this current swung
rapidly to the west setting us dangerously close to Gugegwe Island.
This effect was observed on two successive days.

North of the atoll, and away from land influences, the usual
current sets 300°, 0.7 knots.

— page 246 —
SS183/A16-3
WP-9

SECTION 5
Weather

S-E-C-R-E-T

During November the weather was generally overcast, with frequent
heavy rain squalls and reduced visibility.

During December the weather was generally clear with occasional
rain squalls.

To the eastward of the atoll the seas were in general moderate
with white caps.

To the westward of the atoll the seas were light to moderate.
There was always some surface chop with some white caps.

— page 247 —
SS183/A16-3
WP-9

S-E-C-R-E-T

SECTION 6
Sketches

1. Kwajalein Island - western end.
2. Ebeye Island.
3. South Gugegwe Island.

— page 248 —
[HANDWRITTEN: TANGENT 039]
[HANDWRITTEN: 2 B.A. GUNS]
[HANDWRITTEN: WHITE MARKER 041]
[HANDWRITTEN: SMALL SHACK 042.5]
[HANDWRITTEN: GUN EMPL. 044]
[HANDWRITTEN: SAND BAGS.]
[HANDWRITTEN: SMALL SHACK 049.5]
[HANDWRITTEN: GUN EMPL. 053]
[HANDWRITTEN: BUILDING 054]
[HANDWRITTEN: TOWER 055.5]
[HANDWRITTEN: SMALL SHACK 058.5]
[HANDWRITTEN: TANGENT 059.5]

[HANDWRITTEN: 4000 YARDS]
[HANDWRITTEN: 5000 YARDS]

[HANDWRITTEN: KWAJALEIN ISLAND]
[HANDWRITTEN: WESTERN END]

[HANDWRITTEN: 635]
[HANDWRITTEN: 12/10/43]
[HANDWRITTEN: 8-41.3 N.]
[HANDWRITTEN: 167-42.0 E.]

— page 249 —
[HANDWRITTEN: EBEYE ISLAND]

[HANDWRITTEN: 8-16.8N]
[HANDWRITTEN: 167-47.5E]
[HANDWRITTEN: 1330]
[HANDWRITTEN: 12/2/43]

[HANDWRITTEN: 5800 YARDS]

[HANDWRITTEN: TANGENT 259]

[HANDWRITTEN: TOWER 266½]

[HANDWRITTEN: 6000 YARDS]

[HANDWRITTEN: - MAST 273]
[HANDWRITTEN: - MAST 274½]
[HANDWRITTEN: - BUILDING 276]
[HANDWRITTEN: - BUILDING 280½]
[HANDWRITTEN: - BUILDING 281]
[HANDWRITTEN: - BUILDING 282]
[HANDWRITTEN: - GUN EMPL 285]
[HANDWRITTEN: TANGENT 286]

— page 250 —
[HANDWRITTEN: TANGENT 302°]
[HANDWRITTEN: SMALL BUILDING 308]
[HANDWRITTEN: MAST 309]
[HANDWRITTEN: BUILDING UNDER CONSTRUCTION 310½]
[HANDWRITTEN: BUILDING 312]
[HANDWRITTEN: BUILDING 315]
[HANDWRITTEN: TANGENT 317°]

[HANDWRITTEN: 5500 YARDS]

[HANDWRITTEN: 6000 YARDS]

[HANDWRITTEN: SOUTH GUGEGWE ISLAND]

[HANDWRITTEN: 8-48.5N]
[HANDWRITTEN: 167-47.6E]

[HANDWRITTEN: 1554]
[HANDWRITTEN: 12/1/43]

— page 251 —
SS183/A16-3
WP-9

S-E-C-R-E-T

SECTION 7
Charts

1. Chart of atoll with notes.
2. Target detail map of Kwajalein section with notes.
3. Target detail map of Roi section with notes.
4. Track chart showing positions from which photographs
   were taken.

— page 252 —
(KUEJIERIN TO)
KWAJALEIN OR
(KWAJELINN)
MENSCHIKOV ATOLL

Roi I. Lat. 9° 23' 37" N. - Long. 167° 28' 06" E.
H. W. F. & C. IIIh. 42m. - Springs rise 6 ft.
Natural Scale 1/402199

UNNAMED ISLANDS ARE
GIVEN LETTERS AND ARE
REFERRED TO AS SUCH IN
TEXT OF REPORT.

22' 30' 23' 24' 25' 26'
22'
8° 20'
18'
30'
17'
16'
22' 24' 26'

LIB OR LIP ISLAND
(ERIPPU I)
Lib I. N. W. Edge
Lat. 8° 19' N. - Long. 167° 24' E.

VARIATION 7° 45' E. (1935)
INCREASING 1' ANNUALLY

Nautical Miles
1 0 1 2
0 [UNCLEAR: ers] 5000

(Ebadeu To) Ebadon I
(Mejiyatto To) Mejiatto I
(Taabikku To) Taabik

— page 254 —
25'
TWO
R.R.
GUN
27'
167°29'E.
RADARS
2 HANGARS YES
POSSIBLE A.A.
ADMINISTRATION BLDGS.
YES
NAMUR I.
BARRACKS
BUILDING
CAUSEWAY
& BRIDGE
Ennugarret I.
NO VESSELS SEEN
FLEET
ANCHORAGE
Ennumennet I.
3 RADIO TOWERS NOT
HERE
A
3 RADIO
TOWERS
Ennubirr I.
O - PC BOAT
SEEN
UNDERWAY
B
C
Obella I.
D
SMALL
VESSEL SEEN
Edgigen I.
Debuu I.
Edgell I.
31'
ROI I.
AIRFIELD
23'
23'
NOT SEEN
FOUR TOWERS
POSSIBLE RADAR.
Ennuebing I.
NORTH PASS
21'
21'
Mellu I.
9°19'N.
9°19'N.
0
0
1
2000
2
4000
3 MILES
6000 YARDS
APPROXIMATE SCALE
25'
ATF 17-D
27'
167°29'E.
TARGET DETAIL MAP - ROI
31'
JULY 1, 1943

— page 255 —
[HANDWRITTEN: A8/F44]
[STAMP: RECEIVED]
[STAMP: DEC 26 A.M.]
[STAMP: CINCPAC]
[HANDWRITTEN: 1/16/44]

COMMANDER SUBMARINE FORCE
UNITED STATES PACIFIC FLEET

FF12-10/A16-3/S-85/(11)

Serial 001958
[STAMP: SECRET]

FIRST ENDORSEMENT to
U.S.S. SEAL Secret
ltr. SS183/A16-3, WP-9,
of 20 December 1943.

From : The Commander Submarine Force, Pacific Fleet.
To : The Commander-in-Chief, U. S. Pacific Fleet.

Subject: Photographic Reconnaissance of Kwajalein Atoll.

1. Reconnaissance Report of Kwajalein Atoll is
forwarded herewith.

2. One copy of this report has been forwarded
direct to Joint Intelligence Center, Pacific Ocean Area, and
one copy has been sent to Photographic Reconnaissance Inter-
pretation Section, Intelligence Center, Pacific Ocean Area.

3. The original report forwarded herewith does
not include Sections 8, 9, and Chart No. 4 of Section 7.
These missing sections have been included in the copy sent to
Photographic Reconnaissance Interpretation Section, Intelligence
Center, Pacific Ocean Area, to assist in the photographic
interpretations.

Care of Fleet Post Office,
San Francisco, California,
23 December 1943.

[SIGNATURE: C. A. LOCKWOOD, Jr.]

— page 256 —
END OF REEL
JOB NO. [HANDWRITTEN: G-108]

[MICROFILM RESOLUTION CHART NUMBERS:]
1.0
1.1
1.25
1.4
1.6
1.8
2.0
2.2
2.5
2.8
3.2
3.6
4.0

THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[SEAL: DEPARTMENT OF DEFENSE, UNITED STATES OF AMERICA]

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION