U.S.S. COBIA (SS-245) — war patrol report SS-245_COBIA.pdf

— page 3 —
the target and two hits sent the 2,813-ton storeship DAIJI MARU to the bottom of the sea in latitude 27°25' North; longitude 140°33' East. The first hit obscured the after-end of this enemy in a huge cloud of black smoke and a second torpedo hit forward of the stack in a long roiling explosion. The escorts seemed to be "asleep at the switch". It was a full ten minutes before the first of 45 depth charges rained down into the sea. The enemy followed every change of course so persistently that Commander Becker became suspicious that there was a leak in the number 4 forward bow tube. He closed the vent and flooded to break off the tell-tale streak of air bubbles and soon drew steadily away from the hunting escorts. A plane held COBIA down until after dark and she headed south as an enemy plane patrolled overhead, heralding her every movement. At 0205, 18 July, she let go four torpedoes which ripped apart the 851-ton converted gunboat UKAI MARU number 10 (29°12' North; 139°10' East). That victim was under the sea within five minutes after being hit and COBIA eluded the escorts without difficulty.

Now COBIA sped to intercept a convoy reported by submarine PLAICE. Shortly before daybreak the convoy emerged from a rain squall and a "down-the-throat" salvo ended the career of the 7,785-ton cargo ship NISSHU MARU (29°40' North; 139°20' East). COBIA swung to cross the wake of the convoy as the escort heeded in and gave her a good shaking with 48 exploding depth charges. He stuck with COBIA for an hour and a quarter but all his efforts caused only a few minor observations when he turned and a quarter but all his efforts returned to periscope observation. The plane was not in sight and Commander Becker was convinced that this enemy had not left the scene in a horizontal plane. On the night of 20 July 1944 he sent two torpedoes under the light draft of a small escorted ship, then moved in on the surface to explode this target with 4-inch gunfire. As COBIA ranged alongside this cloud an escorting trawler emerged and headed in to ram with one of the Japanese crew firing a sub-machine gun from the bow. That enemy gunner jumped overboard as the flaming trawler dived the superstructure of COBIA and the bow sprit ripped away the flare-bracket beside the bridge. The flaming wreck drifted aft with explosions as COBIA cleared the area to intercept a convoy reported by submarine GATO to be on the west side of the Bonins. She soon received a message that surface and air units were taking care of these targets and was diverted south to intercept any ships escaping from the air strikes on Chichi Jima. On the morning of 5 August she blew the whole stern off a 500-ton patrol ship which became a mass of flames and was abandoned. At 0603 COBIA closed the scene on the surface and picked up a Japanese prisoner, a sea-bee private named Ona Tora. He was promptly dubbed Tojo by all hands as COBIA headed north to Majuro Atoll in the Marshall Islands. She arrived the morning of 14 August 1944.

COBIA spent her second war patrol in the Luzon Strait where she joined a coordinated search with fleet submarine SNOCK. Departing Majuro on 6 September 1944, she made only four contacts worthy of torpedo fire but was not able to close any of them to attack range. She was enroute to her patrol area on 20 September when a plane came out of the clouds and dropped two bombs. One hit close enough to leave its fragments scattered around the deck when the submarine surfaced. Another enemy plane bombed COBIA on 1

— page 5 —
In the early morning daylight of 15 January CCBIA sighted a raft which turned out to be the same one sighted on the 9th. She picked up the two Japanese prisoners who claimed they had been adrift for forty days. CCBIA cleared Karimata Strait on 17 January to make her way east across the Java Sea. Transit of Lombok Strait was accomplished the night of 18 January when she again out-distanced the small patrol craft on the surface. She reached Exmouth Gulf in the early morning darkness of 21 January to fuel and returned to her base at Fremantle on 24 January 1945.

CCBIA stood out of Fremantle on 18 February 1945 for her fourth war patrol and pointed her bow for the Indo-China Coast. On 21 February, two of her men, without regard to their personal safety, demonstrated their courage and rescurcfulness as submarines anu upheld the high traditions of the naval service.

While securing the number one engine from charge, Motor Machinist Mate First Class Forrest E. Desmond inadvertently closed the outboard exhaust valve on number two engine which was running at the time. Exhaust gases overcame him before he could secure the engines. This was accomplished from the maneuvering room as Chief Motor Machinist Mate Earl D. Remillard entered the compartment to secure the ventilation and was also overcome. He was removed by Motor Machinist Mate First Class Robert E. Kutzleb who covered his face with wet rag before entering. This man returned to the control room and hearing Desmond was unaccounted for, grabbed an oxygen rescue-breathing apparatus and started aft, adjusting this apparatus as he went. The engaging hand-wheel of the oxygen mast broke off before the oxygen cannister was pierced and it offered no protection to Kutzleb. Realizing time was precious, he crawled the length of the compartment to the throttle station in a search for Desmond. Not finding him, Kutzleb closed the engine throttle and fought his way back out of the compartment. Desmond, meanwhile, had passed out against the after bulkhead and was removed to the after engine room, where Commander Becker and the pharmacist mate gave him artificial respiration and put him on oxygen. When his condition did not improve after overnight, CCBIA reversed course at full speed for Exmouth Gulf where on 23 February she transferred Desmond to the USS COUCAL for emergency treatment. Kutzleb's actions unquestionably saved the lives of both Remillard and Desmond. Both he and Remillard were commended for their heroic action of 21 February 1945.

CCBIA resumed her fourth war patrol on 23 February 1945. Three days later she battle-surfaced in the Java Sea and sent a 300-ton armed Japanese sea truck to the bottom with gunfire. While she was diverted to this action, a companion sea truck caught CCBIA off-guard and cut down two of her men with machine gun fire. That enemy soon joined the other sea truck at the bottom of the sea but one of CCBIA's brave crew perished from wounds received in this action. The fighting submarine interrupted her patrol for repairs to a defective lobing motor and radar wave guide at Fremantle during 4-8 March, then set course for the Indo-China Coast. On 24 March a smoke contact developed into a five-ship convoy of two small coastal freighters with two escorts. Four torpedoes, set at four feet, streaked

— page 9 —
311'9"  EXIGIME BEAM:
: 27'3"  STANDARD DISPLACEMENT:
: 1526  Mean Draft:
: 15'3"  SUBMERGED DISPLACEMENT:
: 2424  TONS:
: 20.25  SURFACED:
: 3.75  Submerged:
: 300'  DESIGNED SPEED:
: 6  Officers:
: 54  Enlisted:
: 6  ARMAMENT:
: Torpedo Tubes:
: (10) 21"  (1) 3"/50 caliber
: (2) .50 caliber
: (2) .30 caliber
: 24  TORPEDOES:
: 8  Compiled and stenciled 14 Dec 1960 (ks)

— page 10 —
3245/16-3
Serial (029)

U.S.C. 33245

c/o Fleet Test Office,
San Francisco, Calif.

14 August, 1944.

DECLASSIFIED

From: The Commander, Chief, United States Fleet.
To: The Commander, Submarine Division Two Twenty One.
Via: The Commander Submarine Squadron Twenty Two.
(1) The Commander Submarine Force, Pacific Fleet.
(2) The Commander Submarine Force, Atlantic Fleet.
(3) The Commander in Chief, U.S. Pacific Fleet.
(4) The Commander in Chief, U.S. Atlantic Fleet.

Subject: U.S.S. 33245 - Report of war patrol.
Attacker: USS.

Inclosure: (1) Subject Report.
(2) Tread Chart for Submarine.

1. Inclosure (1) and (2) cover the FRIY
Harzul of the vessel conducted on the ninth Islands during
the period 26 June to 14 August, 1944, are forwarded herewith.

... L. 3245.

DECLASSIFIED
BY: [Signature]
DATE: [Date]

DECLASSIFIED

— page 12 —
U.S.S. COSTA - Fire War Patrol - report of, (Cont'd)

June 29
1026 WX Submerged.
1039 WX Surfcoed.
June 30
0718 WX Made rendezvous with escort planes from Midway (Aircraft Contact #3).
0837 WX Sighted Midway Islands.
1003 WX Moored to U.S.S. PLUNGER, clongside U.S.S. PROTUS, Midway. Topped off with fuel and provisions.
1530 Y Underway from Midway.
July 1
0253 Y Crossed International Date Line.
July 2
0834 M Sighted plane (Aireraft Contact #4) submerged.
0911 M Surfcoed.
2025 M Sighted plane (Aireraft Contact #5).
July 3
0837 M Submerged.
0934 M Surfcoed.
July 4
0837 M Submerged.
0915 L Surfcoed.
July 5
1125 L Sighted numerous oil drums, sank one with 20mm.
1522 L Submerged.
1608 L Surfcoed.
July 6
2025 K Submerged.
2033 K Surfcoed.

CONFIDENTIAL
Enclosure (A).

— page 13 —
2250 K Sighted patrol vessel, range 12,000 yards (Ship Contact #1). Closed and sunk with gun fire. (Gun Attack #1). Target was a converted trawler, coastal minesweeper of about 400 tons, armed with depth charges and probably machine guns.

July 7
0035 K Target completely riddled, airfo for and aft. Cleared area.

1322 K Sighted plane (Aircraft Contact #6) submerged.

1400 K Surfaced.

July 8
0940 K Sighted plane (Aircraft Contact #7) submerged.

1030 K Surfaced.

2110 I Sighted Kits. Iwo Jima distance 50 miles. Iwo Jima at range of slightly over 10 miles to prevent being picked up by any radar on the island.

July 9
0129 I Headed for Iwo Jima to have a look at the roadstead.

0243 I Sighted Iwo Jima distance 28 miles.

0357 I Submerged. Closing Iwo Jima.

0626 I Sighted plane (Aircraft Contact #8).

0756 I Sighted two ships, range 16,000 yards (Ship Contact #2). Ships turned out to be one CI escorted by one FUBUAI DD, and one Kates plane. Commenced approach. (Torpedo Attack #1) With range of 1,200 yards, and 90 port track was just raising scope for firing bearing machine at.

0819, Kato dropped a bomb close aboard and shook up the ship considerably. Put up the scope to get off a shot anyhow. However, the bomb had blown fusos on the gyro low speed transmitter and caused the TUC to take off in a whirl of dials so that at 0820 the first torpedo went off with a swinging gyro. Checked fire and attempted to maneuver ship for bow and arrow.

CONFIDENTIAL - 3 - Enclosure (A).

— page 16 —
0733 I First of forty-five (45) depth charges dropped. Attack was fairly accurate, much closer than the previously encountered DD, and more persistent.

: 0745 I Heard one set of heavy screws accompanied by one set of light screws passing up port side. Started up to periscope depth in hope of getting a shot or at least tracking remaining target but at 150 feet depth charges started getting closer and sound showed escorts closing in, won't back down to 200 feet.

: 0829 I Depth charges started to open out considerably. Enowvor he followed our evry change of course. He followed us so persistently I bolicved we wore leaving slick from #4 FST. Closed vent and flood to reduce slick. Bow Buoyancy was observed to be looking and leaving trail of bubbles. Closed vent.

: 1030 I Went back down to 300 feet and changed course to left. Drow steadily awry from this time.

: 1138 I Poriscopo depth; all clear.

: 1620 I Surfacood. Headed back for seano of sinking to pilot up any intelligence deta.

: 1630 I Sighted plane (aircraft Contact #19) circling over area. Submerged.

: 1928 I Surfacood. Headed south to see if shonl spot on chart is fishing bank and knock off seano scampens.

July 14

: 0300 I Passed over sloal in 26-40N 140-58E, no fishing boats.

: 0429 I Submerged.

: 1750 I Sighted plane (aircraft Contact #20).

: 1930 I Surfacood. Headed in to Hain Jina to intercept any ships heading south. The plane vo sighted was patrolling this line and most trios wo have sighted a plane so fer it has heorailed some ship movements. At 44,000 yards the LNR snowed his radar stopping sweop and stucky on us. His radar was much stronger than it was on the tro proceeding days in the area. When wo had opened to 55,000 yards thoir radar apparently lost us because it began sweeping across us again. Headed north to intercept any shipping to Chichi Jina from the north.

CONFIDENTIAL - 6 - Enolosure (1).

— page 17 —
U.S.S. COBIL - First War Patrol - report of. (Cont'd)
July 15
0353 I Plane sighted (aircraft contact #21). Submerged. Ran into 100 fathoms curve thrown turned and opened out to surface.
1926 I Surfaced. Hacked to north searching for contact.
July 16
0550 I Sighted lots Wifo.
0639 I Sighted small patrol boat close to lots Wifo. (Ship Contact #6) Changed course to keep out of sight.
1740 I Submerged.
1848 I Surfaced.
1935 I On track of contact, reverse of possible course.
2032 I Pip on radar, range 7,150. (Ship Contact #7). Exchanged cell signs with U.S.S. SICOK(S3279) by radar. SNCOK opened to westward.
2110 I Pip on radar and SJ radar interforance, range 7,950 (Ship Contact #8) same size as pij on SICOK, but bearing to east. Is this was probably another U.S. Sub as evidenced by his SJ radar, and as we were between the two, turned and ran down contact's possible track.
2345 I Turned to open contact's track to C.stward & miles. Have now cut speed circle 9 to 5 knots along track.
July 17
0108 I Turned to run perellol to contact's course, 20 miles to eastward.
0404 I SJ contact and on another U.S. Sub radar interforance. (Ship Contact #9).
0800 I Commenced cutting across contact's track to other side, having caught up to his 7 knot speed circle again.
1242 I 20 Miles on opposite side of contact's track on 8 knot circle. Reversed contact's course cutting lower speed circles again.
1730 I Have searched contact's track and 20 miles each side for speed circles of 5 to 6 knots. Hacked for point north of Nishino Shima through which he should have to pass.
CONFIDENTIAL - 7 - Enclosure (L).

— page 18 —
103 I
Heard explosions and saw flashes bearing 120° T and headed toward.

: 115 I
Pip on radar, range 11,000 (Ship Contact 110).
Connected tracking. (Torpedo attack 13). The smaller
pips near him are apparently small escorts not large
enough for a torpedo. Her exit visible at 5,000 yards,
a heavily laden three island and similar to 1100
making 0.5 knots.

: 205 I
fired four tubes forward. Two lits seen, heard, and
felt. Target seen to sink in about five minutes.
Pip disappeared from radar. Heavy under-water ex-
plosion seen and felt at scene of sinking about 20
seconds after target disappeared. Cleared area and
escorts at 11-nth speed.

: 224 I
escorts disappear from radar at 5,000 yards.

: 300 I
received T.D.S. 7.3.15 contact report on convoy.
Escaped for the eastern part of his space circle.

: 440 I
Turned west to cut speed circles of convoy on
possibility that our recent sinking was a straggler
from the same convoy.

: 522 I
Large 2 and 4 A covered 1000 rail signal ran about
20,000 yards (Ship Contact 111). Angle on bow about
400 port.

: 533 I
Submerged. Hulled standard on normal approach course.
Two zigs in our direction out on his track. Light
ship is a big one completely alerting medium at
small A. action as escort, CDR, and one smaller
escort.

: 700 I
Fired six tubes forward (Torpedo attack 14) down
his throat. Two hits just side anchorage seen and
heard. He lists to port and started firing his deck
gun, but could not depress to hit us. Turned left
to shoot aft.

: 704 I
Fired four tubes aft with a large track, short run.
The hits in his stores seen and heard. These blew
depth charges over his stern and the escorts headed
in. He fired for depth charge attack and went to
300 feet. Switching right to cross wake of convoy.

: 709 I
Depth charge attack started. This CDR was by
far the best anti-sub ship we've announced so far.
His charges were roughly below and aft with a fairly
equal distribution between the port and starboard
sides. However the ship was right and took it with
no loss.

— page 20 —
U.S.S. COBILA - First War Patrol - report of. (Cont'd)
July 20 (Cont'd)
2154 I Fired remaining tubes forward at 15 knots, torpedoes set to foot apparently ran under. Hopid to knock them off with gun-fire. (Gun Attack #2).
2246 I Closed to 1,000 yards and commenced firing on largest target. First 4" shot knocked off his bridge. A bolt of 5" oil. moved down several of the crew. He showed no signs of life after this burst. Ship flew the Jap Naval Ensign and was much larger than the others. Took other vessels under fire with forward 20mm.
2255 I Patrol vessel on fire for and aft end sinking.
2256 I Headed for next target. The larger traveler had moved behind the smaller of the two so that the two were in a nest.
2309 I Near trawler blew up and sank with a terrific explosion, leaving a large cloud of smoke and steam, as a result of a direct hit from 4" gun. Scoured 4" gun crew and machine gun fire and was wrecked close enough for effective cover as possible. As we were close enough for effective cover as

— page 21 —
U.S.S. COBI - Fire War Patrol - report of. (Otd)
July 21 (Cont'd)
0239 I. One large explosion seen and heard in direction of
glow probably patrol vessel blowing up.
0416 I. Submerged.
1300 I. Surfaced to have a high look around.
1518 I. Submerged.
1914 I. Surfaced. Headed beok toward west end of arc.
July 22
0450 I. Submerged. Headed south along western part of arc
near scene of gun action.
1004 I. Surfaced.
1100 I. Sighted numerous fire blackened oil drums.
1154 I. Sighted periscope or wreckage one point on port bow
distance 3,000 yards. (Ship Contact #13) Gave it
benefit of doubt; turned away at flank speed and
colored area.
1405 I. Submerged.
1914 I. Surfaced.
July 23
0000 I. Finished transmitting COBI serial #3 from position
north of Nuku Jima, so opcnod to east part of area.
Key intercept any ships the Japs might route to miss
our position if they DF'd us.
0429. Submerged. Completely overcast with low clouds.
1901 I. Surfaced. Headed to north part of area. Rainy,
overcast and black.
July 24
0447 I. Submerged.
1223 I. Surfaced in nopos of e sun lino.
1253 I. Submerged.
1318 I. Headed beok toward Nuku Jima.
1912 I. Surfaced. Stormy and overcast.
CONFIDENTIAL - 11 - Enclosure (a).

— page 22 —
U.S.S. COBILA - First Wcr Patrol - report of, (cont'd)
July 25
0355 I Picked up kuko Jima on radar distance 35,000 yards.
0437 I Submerged off eastern side of Nuku Jima.
1100 I Opened to eastward.
1907 I Surfaced.
2247 I Received U.S.S. TUNA'S contact report. Headed for area south of Yome Jima to cover either side of Nuku Jima Retto Jap might try to use.

July 26
0403 I Submerged. Conducted patrol south of Yome Jima. Visibility was poor until early afternoon.
1340 I Sighted mast apparently a DD, bearing 250° T. (Ship Contact #14). Could not close. Heeded across reef in case this were a convoy escort.
1506 I Sighted whale killer type vessel bearing 280° T armed with two (2" or smaller) guns. (Ship Contact #15). He is also a possible escort. Too rough and close to Chioni Jima for gun action.
1620 I Sighted plane (Aircraft Contact #23).
1919 I Surfaced. Hacked back on 095 to re-enter our own area.
1943 I Pip on radar, range 3,000 yards. (Ship Contact #16). Co. menaced tracing. At 6,000 yards could make him out as small and from his actions, a probable patrol vessel. Still too rough and close for guns, so colored vicinity at full speed and headed for conter of our area.

July 27
0408 I Submerged. Petrolled center of area.
1708 I Sighted plane (Aireraft Contact #24).
1920 I Surfaced.

July 28
0408 I Submerged. Headed for 100 fathom curve north of Haha Jima.
1450 I Photographed panorama of Haha Jima.
1914 I Surfaced. Headed for south east corner of area.

CONFIDENTIAL (A)

— page 23 —
U.S.S. COBI: - First War Patrol - report of. (Cont'd)
July 29
0458 I: Submerged. Patrol led east and of area.
1125 I: Surfacod.
1342 I: Submerged. Headed for north east and of area.
1912 I: Surfacod.
July 30
0422 I: Submerged. Headed for 100 fathom curve north of Chichi Jima.
1321 I: Photographed parts of Chichi Jima. Visibility not too good.
1919 I: Surfacod. Headed for north and of area.
July 31
0000 I: Changed course to north and speed to full. Chasing report of convoy north from Chichi Jima hugging island chain.
1213 I: Sighted plane (aircraft #25). Submerged.
1300 I: Surfacod.
1802 I: Sighted Torii Shima. Decided to head as far north as Sumisu Shima to cut his 6.5 knot speed of 6.5 knots.
2100 I: Sighted Sumisu Shima.
2205 I: Roverscour course to south after passing Sumisu 6,000 yards abeam.
August 1
0112 I: Picked up Torii Shima on radar, distance 43,000 yards.
0235 I: Passed Torii Shima 5 miles abeam and headed for Lot's Wife.
0444 I: Sighted Lot's Wife.
0555 I: Picked up sweeping radar at 270 MC's. Later checks of 2nd MD's contact report showed this was probably convoy and that we had passed within 30 miles of it.
0606 I: Passed Lot's Wife 9 miles abeam.

CONFIDENTIAL

- 13 -
Enclosure (A).

— page 24 —
0854 I Sighted plane low and close (Aircraft Contact #26). Submerged; no probably saw us.

0956 I Surfaced. Hoaded for north west corner of area "P" to skirt this area and head to an assigned one to south.

1540 I On do coding 2WMDOS contact report headed east to make a possible interception with second convoy. App. rontly Sally we sighted this morning was convoying thet outfit. So near yot so far!

1945 I Patrolicd area on reported track of convoy.

2040 I On receiving SHARK'S contact report headed east to see if convoy would come over to our side of Muko Jima.

August 2

0115 I Picked up swooping radar at 150 kts. Remembering our experience of this morning, after closing 100 fathom curve turned back to cover convoy's track if he wore trying to dodge behind us.

0400 I Doooded SHARK'S latest contact report. Convoy went down other side of Muko Jima.

0415 I Submerged 10 miles north of Kishino Shima. Opened to east.

1916 I Surfaced. Hacked for area "L" assigned us for duration of air strike.

2200 I Entered area "L".

August 3

0240 I Headed for huko Jima.

0415 I Submerged.

1906 I Surfaced. Hacked for center of area "L".

August 4

0440 I Submerged, patrolling center of area "L".

1914 I Surfaced.

2140 I On receipt of U.S.S. GATES contact report with convoy on west side of Bonins changed course to 284 to intercept.

CONFIDENTIAL - 14 - Enelosuro (ii).

— page 25 —
U.S.S. COSTA - First MCR Patrol - report of. (Cont'd)
Aucust 4 (Cont'd)
2235 I  Received second message from GATO saying that our surface and air units were taking care of convoy. Headed south to petrol for units trying to escape from ChiChi Jima.
Aucust 5
0330 I  Heard numerous conversations between American fliers over PR. Excerpt: "There are enough ships in the harbor for all of us".
0455 I  Sighted ship (Ship Contact #17) submerged and changed course to alcos.
0540 I  Next look showed our yclnos strafing target. Ono Holl Divor and ono Hollcat identified. (Aircraft Contact #27) Target set afiro and all hands abandoned ship. No must have knocked him rihht out from under the noses of our Zoomies.
0541 I  Surfaced and closed target. Numerous Japs - floating around in the water, all in what we thought were merino uniforms. By estimate was 20.
0545 I  Boosted the fire on wreckage of bor and sunk large oil tank with 3 pons of 20mm and 50 cal in order to sink everything a man might keep dry on.
0548 I  Sighted land, our first sight on anything in two days, to the west.
0550 I  Large numbers of planes (Aircraft Contact #28) passing overhead. Listening to them chatter over the air and watching them perform pushed morale up to a new high.
0603 I  Rocked up Jap prisoner, a sea-boo private named One Tora, but promptly dubbed Tojo by all hands. Headed north to clear area.

CONFIDENTIAL - 15 - [Enclosure (A)]

— page 27 —
2206 I. Submerged.
: 2227 I. Surfaced.
: August 9
: 0240 I. Passed lashed Island 74 miles abeam to starboard.
: August 10
: 1912 I. Submerged.
: 1536 K. Surfaced.
: August 11
: 0940 I. Sighted plane (aircraft contact 29). Submerged.
: 1014 I. Surfaced.
: 1108 K. Sighted plane (aircraft contact 30). Submerged.
: 1305 I. Surfaced.
: 1715 I. Passed Wake Island 45 miles abeam to port.
: August 12
: 1015 I. Entered Japanese safety lane.
: August 13
: 0550 I. Sighted G-2 or C-3 Cargo Ship (ship contact 18). Turned away and evaded.
: 0934 I. Sighted plane (aircraft contact 31).
: 1115 I. Sighted Sikaer atoll bearing 2220° T.
: 1300 I. Sighted periscope (ship contact 19). Evaded at high speed and sent co-cast to contact to report. Fire fire of sighting periscope until close to lead contact. Assault sent to all sons on for schedule to less than one half hour.
: 2120 I. Plane contact on 35 (lane contact 32). Acknowledged IFF signal. Plane close to 3 miles from exposed out, was never sighted. See intercom to contacts, none sighted.

End transcription.

— page 30 —
1.2250 7/6 28-25 1st Conv. Control 12,000 Stop: 1 Sunk EC
  (-10) 151-46 1st Conv. Patrol 12,000 100 P 1 Escort BC
2.0756 7/9 24-52 FUBUKI DD & CM 16,000 19 1st US Miss
  (-9) 141-18 5,000 180 P 1 EC
3.1207 7/12 27-18 2 Sampans 5,000 180 P 1 EC
  (-9) 142-05 5,000 180 P 1 EC
4.1237 7/12 27-20 2 Sampans 5,000 180 P 1 EC
  (-9) 142-05 5,000 180 P 1 EC
5.0559 7/13 27-23 2 ATS 15,000 120 SD 1 A Sunk
  (-9) 140-33 3 escorts 9 120 SD
6.0639 7/16 29-28 1 Patrol 20,000 Vary 5
  (-9) 140-21 1 Vessel 5
7.2032 7/16 31-39 1 U.S. Sub. 7,150 330 R 1 EC
  (-9) 137-27 1 SICOCL 15
8.2110 7/16 31-39 1 U.S. Sub. 7,950 1 R 1 EC
  (-9) 137-34 1
9.0404 7/17 31-21 1 AKS 6,700 140 R 1 EC
  (-9) 137-45 1 U.S. Sub. 6,700 140 R 1 EC
10.0116 7/18 129-12 1 AKS 11,000 210 8 R 1 A Sunk
  (-9) 139-10 2 Escorts 8 11,000 210 8 R 1 A Sunk
11.0528 7/18 28-43 2 AKS 14,000 150 SD 1 A Sunk
  (-9) 139-24 3 Escorts 8 14,000 150 SD 1 A Sunk
12.1942 7/20 27-54 1 Patrol Vessels 8,500 322 5 R 1 Sunk
  (-9) 141-46 1 Sunk 8,500 322 5 R 1 Sunk
13.1154 7/22 28-32 2 Torisooop or 3,000 205 SD Sunk
  (-9) 141-50 1 Wreckage 8,500 205 SD Sunk
14.1340 7/26 27-24 1 Last sailor 150 1 EC
  (-9) 142-13 1 Thatch or DD 15,000 20 1 EC
15.1506 7/26 27-20 1 Armed Sampan 6,000 180 1 EC
  (-9) 142-09 1
16.1943 7/26 27-26 1 Patrol Vessels 8,000 215 1 EC
  (-9) 142-08 8,000 215 1 EC
17.0445 8/5 27-40 1 Patrol Vessels 12,000 205 SD Sunk
  (-9) 142-28 8,000 205 SD Sunk
18.0550 8/13 13-35 0-2 or 0-3 22,000 130 SD EM
  (-11) 170-28 1 Carpo Ship 13,000 130 SD EM
19.1800-18/13 11-02 1 Patrol 3,000 1 EC
  (-11) 170-35 1
20.0525 8/14 18-32 1 US DDS98 120,000 320 SD 1 EC
  (-11) 170-32 1

CONFIDENTIAL

- 18 -

Enclosuro (L).

- 18 -

No. | Time | Date | IX | Type | R | CS | W | Remarks
--- | --- | --- | --- | --- | --- | --- | --- | ---
1 | 2250 | 7/6 | 28-25 | Xth Conv. Control | 12,000 | Stop: 1 Sunk EC
  (-10) | 151-46 | 1st Conv. Patrol | 12,000 | 100 P 1 Escort BC
2 | 0756 | 7/9 | 24-52 | FUBUKI DD & CM 16,000 | 19 1st US Miss
  (-9) | 141-18 | 5,000 | 180 P 1 EC
3 | 1207 | 7/12 | 27-18 | 2 Sampans | 5,000 | 180 P 1 EC
  (-9) | 142-05 | 5,000 | 180 P 1 EC
4 | 1237 | 7/12 | 27-20 | 2 Sampans | 5,000 | 180 P 1 EC
  (-9) | 142-05 | 5,000 | 180 P 1 EC
5 | 0559 | 7/13 | 27-23 | 2 ATS 15,000 | 120 SD 1 A Sunk
  (-9) | 140-33 | 3 escorts | 9 120 SD
6 | 0639 | 7/16 | 29-28 | 1 Patrol 20,000 Vary 5
  (-9) | 140-21 | 1 Vessel | 5
7 | 2032 | 7/16 | 31-39 | 1 U.S. Sub. 7,150 | 330 R 1 EC
  (-9) | 137-27 | 1 SICOCL 15
8 | 2110 | 7/16 | 31-39 | 1 U.S. Sub. 7,950 | 1 R 1 EC
  (-9) | 137-34 | 1
9 | 0404 | 7/17 | 31-21 | 1 AKS 6,700 | 140 R 1 EC
  (-9) | 137-45 | 1 U.S. Sub. 6,700 | 140 R 1 EC
10 | 0116 | 7/18 | 129-12 | 1 AKS 11,000 | 210 8 R 1 A Sunk
  (-9) | 139-10 | 2 Escorts | 8 11,000 210 8 R 1 A Sunk
11 | 0528 | 7/18 | 28-43 | 2 AKS 14,000 | 150 SD 1 A Sunk
  (-9) | 139-24 | 3 Escorts | 8 14,000 150 SD 1 A Sunk
12 | 1942 | 7/20 | 27-54 | 1 Patrol Vessels | 8,500 | 322 5 R 1 Sunk
  (-9) | 141-46 | 1 Sunk 8,500 322 5 R 1 Sunk
13 | 1154 | 7/22 | 28-32 | 2 Torisooop or 3,000 | 205 SD Sunk
  (-9) | 141-50 | 1 Wreckage | 8,500 205 SD Sunk
14 | 1340 | 7/26 | 27-24 | 1 Last sailor 150 1 EC
  (-9) | 142-13 | 1 Thatch or DD 15,000 | 20 1 EC
15 | 1506 | 7/26 | 27-20 | 1 Armed Sampan | 6,000 | 180 P 1 EC
  (-9) | 142-09 | 1
16 | 1943 | 7/26 | 27-26 | 1 Patrol Vessels | 8,000 | 215 1 EC
  (-9) | 142-08 | 8,000 | 215 1 EC
17 | 0445 | 8/5 | 27-40 | 1 Patrol Vessels | 12,000 | 205 SD Sunk
  (-9) | 142-28 | 8,000 | 205 SD Sunk
18 | 0550 | 8/13 | 13-35 | 0-2 or 0-3 | 22,000 | 130 SD EM
  (-11) | 170-28 | 1 Carpo Ship | 13,000 | 130 SD EM
19 | 1800-18/13 | 11-02 | 1 Patrol 3,000 | 1 EC
  (-11) | 170-35 | 1
20 | 0525 | 8/14 | 18-32 | 1 US DDS98 | 120,000 | 320 SD 1 EC
  (-11) | 170-32 | 1

— page 31 —
1 2 3 4 5
Date: 27 June 27 June 30 June 2 July 2 July
S Time (Zono) 1337 0853 2025
B Position: Lat. 24-10.5N 28-24.3N 28-21N 28-35N
A Speed 15 14.5 13.5 15 14
R Course 326 291 217 270 270
E Trin Surface Surface Surface Surface Surface
Minutes Since Last
SD Radar Search 0
Number 1 1 2 1 1
A Type US PBM US PBM SBD PEY PEY
I Probable Mission Patrol Patrol Escort Patrol Patrol
R How Contacted Lookout Lookout Lookout Lookout Lookout
T Initial Range 12 miles 10 miles 7 miles 6 miles 10 miles
C Elevation Angle 40 50 60 40 30
T Range & Relative
Bearing of Plane 9.5 mi. ND UNK ND ND
When it Detected
S/M

(State (Beau-
Soa: fort) 2 2 2 2 2
C Direction(Rcl) 110 110 135 290 045
N Visibility (Miles) 30 30 30 30 10
I Clouds: Height in
T Clouds: Ft. 20,000 20,000 5,000 6,500 6,500
I Overcast 50% 50% 50% 60% 50%
N (Bearing(Rcl) None None None None None
S Moon: Angle
(2percent
Illum.

TYPE CAMOUFLAGE THIS PATROL - 321355-B

- 19 - Enclosure (A)

— page 32 —
6 7 8 9 10
Date: 7 July 8 July 9 July 10 July 10 July
S Time (Zone) 1322 0940 0626 1055 1117
U Position: Lat. 28-24N 26-26N 24-55N 25-33N 25-34N
M Long. 148-32E 144-36E 141-16E 140-58E 140-57E
A Speed 13 14 12 14 14
I Course 260 231 163 330 330
N Trim. 0
E Minutes Since Last SD Radar Search 0
Number 1 1 1 1 1 1
A Type: Sally Sally Keto Betty Betty
I Probable Mission Patrol Patrol Escort Trans. Trans.
C How Contacted Lookout Lookout Perris Perris Perris
A Initial Range 5 miles 7 miles 5 miles 8 miles 8 miles
F Elevation Angle 240 10 50 50 50
T Range & Relative Bearing of Plane When it Detected S/M ND ND UK ND ND
(State (Boa-)
C Sea: (fort) 2 2 1 1 1
O (Direction(Ral) 310 250 230 310 310
N Visibility (Miles) 40 40 40 40 40
D Clouds: (Height in 3,500 20,000 6,000 10,000 10,000
I (Percent Overcast 10% 60% 70% 90% 90%
O (Bearing(Ral) None None None None None
N Moon: (Angle
(Percent
Illumi.

— page 33 —
1. 10 July 12 July 11 July 12 July 12 July
2. 1205 1520 1700 0843 1037
3. Time (Zone) (-9) (-9) (-9) (-9) (-9)
4. Position; Lat. 25-36N 26-42N 26-45N 27-05N 27-10N
5. Long. 140-56E 142-04E 141-58E 142-02E 142-04E
6. Speed 4 4 2 4 4
7. Course 330 330 300 010 010
8. Trim 0 0 0 0 0
9. Minutes Since Last SD Radar Search 0
10. Number 1 1 1 1 1
11. Type Betty Unk Unk Davo Davo
12. Probable Mission Trans. Patrol Patrol Patrol Patrol
13. How Contacted Peris Peris Peris Peris Peris
14. Initial Range 8 miles 15 miles 15 miles 6 miles 6 miles
15. Elevation Angle 40 10 10 20 10
16. Range & Relative Bearing of Plane When it Detected S/M
17. (State (Beau-)
18. Sea: (fort) 1 1 0 1 1
19. (Direction(Rol) 310 046 010 080 080
20. Visibility (Miles) 30 30 30 30 40
21. Height in Clouds: Ft. 5,000 6,500 2,000 6,500 6,500
22. Overcast 90% 30% 20% 50% 30%
23. (Bearing(Rel) None None None None None
24. Moon:(Angle
25. (Percent
26. Illum.

- 21 -
Enclosure (A)

— page 34 —
16 17 18 19 20

Date: 12 July 13 July 13 July 14 July
S Time (Zone): 1148 1441 0443 1630 1750
U Position: Lat: 27-13N 27-23N 27-23N 27-23N 27-12N
B Long: 142-043 142 140-372 140-308 141-227
A Speed: 3.8 3.8 10 10 245
R Course: 010 358 258 002 000
N Trim: 2nds 2nds 2nds 2nds 2nds
E Minutes Since Last SD Radar Search: 00 00 00 2 mins, 00
Number: 1 1 1 1 1
A Type: Dcve: Unk Unk Unk Dcve2
I Probable Mission: Patrol Patrol Escort H Scout
R How Contacted: Peris Peris Lookout Lookout Peris
R Initial: Range: 5 miles 18 miles 6 miles 7 miles 7 miles
A Elevation Angle: 20 20 140 20 10
T Range & Relative Bearing of Plane When it Detected: ND ND ND ND ND
3/M

C Sea: (State (Beau- 1 1 0 1 1
C
O Direction(Rel) 080 080 190 030 120
N Visibility (Miles) 40 40 40 40 40
I Clouds: (Height in 6,500 6,500 -- 10,000 8,000
T Forecast Overcast 30% 40% 0 20% 15%
O (Bearing(Rel) None None None None None
N Moon(Angle
(Percent
Tilum.

- 22 - Enclosure (A)

— page 35 —
15 July 19 July 26 July 27 July 31 July
: 0353 0653 1620 1708 1213
: 27-20N 28-57N 27-23N 26-46.5N 29-50N
: 141-45E 140-36E 142-04E 142-41.3E 142-44E
: 075 000 290 090 250
: 0
: 1 2 1 1 1
: Unk Val Sally Vel Betty
: Unk Scout Patrol Patrol
: Lookout Ports Ports Lookout
: 7 miles 7 miles 4 miles 4 miles
: 10 110 40 20 70
: ND ND ND ND ND
: 1 2 3 2 3
: 025 225 180 150 060
: 40 35 15 20 30
: -- 5% 5,000 5,000 3,000 8,000
: 0 5% 90% 75% 30%
: None None None None None
: None

Enclosure (A)

— page 37 —
31 32
Date: 13 August 1943
Time (Zone): 0934 -4-11
Position: Lat. 12-4.1N 10-05N
Long. 170-30E 170-34E
Speed: 15 14
Course: 180 180
Trin. Surface Surface
Minutes Since Last SD Radar Search 0
Number 1 1
Type B-26 Unk
Probable Mission Patrol Patrol
How Contacted Lookout SD
Initial Range 7 miles 26 miles
Elevation Angle 50 Unknown
Range & Relative Bearings of Plane 8 miles Unknown
When it Detected 160
S/M

State (Beaufort) 2 2
Direction(Rel) 090 090
Visibility (Miles) 30 7 miles
Height in Clouds: Ft. 10,000
Percent Overcast 5% 30%
Bearing(Rel) None None
Moon(angle) None
Percent Illum. 1

- 24a - Enclosure (A)

— page 38 —
1. U.S.S. COBIL - First Patrol - report of. (CONT'D)
   - H - ATTACK DATA
   - U.S.S. COBIL: Torpedo Attack No. ONI Patrol Number ONE
   - Time: 0820 (-9) Date: 9 July, 1944. Lat. 24-52N Long. 141-18E
   - TARGET DATA - DAMAGE ATTRIBUTION
   - DESCRIPTIONS:
     - One CM similar attached sketch (3U) led by one
     - TUBUKI class DD (3C) escort. Ships in line of boat-
     - ing about 1,000 yards apart, with Kato air escort
     - standing toward Ivo Jima from north west. Sighted
     - by periscope. Sea glassy calm, with unlimited
     - visibility, about 70% clouds and little or no wind.
   - Target Draft - 10' Course 100 Spood 19 Range 1,200
     - Own Ship Spood 2 Course 180 Depth 63' Angle 10 down
   - T.Y.D ATTACK:
     - Submerged. Toroidic depth charging had been heard
     - for about two hours before sighting target. Targets
     - originally sighted by periscope, ran 16,000 yards
     - and thought to be two fishing boats. Closer looks
     - snowed two DD's and finally a DD escorting one CM.
     - Large port angle on bow. Came to normal approach
     - course and made ready the tubes. Two successivo
     - zigs toward gave us a 1,200 yard run and a nico sot
     - up. Was diving around "Up periscope" when Kato
     - dropped her bomb. Figured I had seen this before
     - he could not anchor run so put up the scope and
     - tried to get off our shot out the gyro low spood
     - transmitter had blown it's fusos and the TDC and
     - steering repeater were spinning. Torpedo was fired
     - just as casually became apparent. Checked fire and
     - attempted to set up for bow and arrow shot. How-
     - over the CM turned toward and ran the closed too
     - rapidly to get set up. Gave up and headed down.
     - He ran down port side as we passed 80 foot, sounding
     - to 300 feet ri. He dropped anchor. He apparently
     - dropped his anchors where the aircraft bomb had hit,
     - a position well astern at the time.

FIRE CONTROL AND TORPEDO DATA:

| Tube | 1 | Attrition | 3et | Contact |
|------|----||-----||
| Track | 1297 | Actual | 3otution | None |
| Gyro | 331 | Ink.Warhead | 16-1 |          |
| Depth | 61 | Soriel | 13767 |          |
| Lower | High | Explosive | Torpex |          |
| Hit-Miss | Miss | Firing Interval |          |          |
| Erratic | No | Spread |          |          |
| Mk, Torpedo | 23 | Sea Condition | Glassy calm |          |
| Serial | 61830 | Overhaul at. | 3eral Harbor, |          |
| Mk.Exploder | 6-7 | Sub Base. |          |          |
| Serial | 21820 |          |          |          |

REMARKS: Just prior to firing,
Jap plane dropped bomb which flew fusos on the gyro low speed trans-
mitter and caused the TDC, and thororfor the regulator-indicator

CONFIDENTIAL - 25 - Nucleosure (L).

— page 41 —
U.S.S. COBI - First patrol - report of: (o |d)
H - ATTACK D.T.A.
U.S.S. COBI. Torpedo Attack No. Two patrol Number ONE
Time: 0728 (-9) Date: 13 July, 1944. Lat. 27-23N Long. 140-33W

TARGET DATA - DANGER INFLICTED

DESCRIPTION:
A/4 - HIJMS Roshina -30-8,751 tons. One stack, well dock, split superstructure, HEM, straight bow, naval auxiliary with grey stack and large white "4" painted on stack. Target very heavily laden. Lookouts in whites manning the rail. Anchor ship in column; three escorts, one of them similar to Corvotto, the others scuppers. One escort plane. Plane and smoke sighted right after moving surfaced. Sea calm, no wind, no clouds, visibility unlimited.

DAMAGE DETERRED BY: Was looking at escort when first hit heard. Swung scope around and saw target with all of aft and obscured by a huge cloud of black smoke. No was already listing to starboard showing a bow full snowy forecastle deck. Second torpedo hit the starboard of stack just as scope dipped. Very loud sounds of grinding and tearing metal heard through hull for about four minutes. Bubbling and curdling noises heard through sound cover. At this time there was a long rolling explosion - boilers (?) - definitely not a torpedo or depth charges. Follows this on explosion of a group of charges - anchor on port - (?) - from the bearing of the target. Target was not heard after this. Depth charge attack started about one minute thorafort from different bearing. Several pieces of coal were found on deck after surfacing. Now had heard breaking up noises before stated these were the loudest noises they had ever heard. No were 1,000 yards or more from target at all times.

SUNK:
A/4 HIJMS ROSHINA - 8,751 tons.

Target Draft - 24' Course 100 Spood 8 Range 1,100
Own Ship Spood 3.9 Course 333 Depth 64' Angle 1° down

TARGET ATTACK:
Submerged. Dived when we sighted plane coming out from Chichi Jima. On surfacing one half hour later sighted plane and two columns of smoke distance 24,000 yards. Dived and headed for the normal approach course when first look showed he was on route toward Chichi Jima. Hull had for over an hour and was finally rewarded by a zig towards. He was constant halting or zigging with very short legs. Worked into position on starboard bow of target.

CONFIDENTIAL - 28 - [enclosure (.)]

— page 42 —
1,000 yards fired three tubes forward with a 80 strobocard track and gyros 30 ft. The hits. After third shot took look at near escort, small port angle and ran a about 400 yards. Ordered deep submergence. Had intended to fire all tubes, but firing key operator checked fire when I saw order to start deep. Escort must have been asleep at switch as he took a long time to start counter attack.

TIR, CONTROL AND TORPEDO DATA

| Data | TIR, CONTROL AND TORPEDO DATA |
|------||
| Tube | 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495, 496, 497, 498, 499, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517, 518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528, 529, 530, 531, 532, 533, 534, 535, 536, 537, 538, 539, 540, 541, 542, 543, 544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 563, 564, 565, 566, 567, 568, 569, 570, 571, 572, 573, 574, 575, 576, 577, 578, 579, 580, 581, 582, 583, 584, 585, 586, 587, 588, 589, 590, 591, 592, 593, 594, 595, 596, 597, 598, 599, 600, 601, 602, 603, 604, 605, 606, 607, 608, 609, 610, 611, 612, 613, 614, 615, 616, 617, 618, 619, 620, 621, 622, 623, 624, 625, 626, 627, 628, 629, 630, 631, 632, 633, 634, 635, 636, 637, 638, 639, 640, 641, 642, 643, 644, 645, 646, 647, 648, 649, 650, 651, 652, 653, 654, 655, 656, 657, 658, 659, 660, 661, 662, 663, 664, 665, 666, 667, 668, 669, 670, 671, 672, 673, 674, 675, 676, 677, 678, 679, 680, 681, 682, 683, 684, 685, 686, 687, 688, 689, 690, 691, 692, 693, 694, 695, 696, 697, 698, 699, 700, 701, 702, 703, 704, 705, 706, 707, 708, 709, 710, 711, 712, 713, 714, 715, 716, 717, 718, 719, 720, 721, 722, 723, 724, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736, 737, 738, 739, 740, 741, 742, 743, 744, 745, 746, 747, 748, 749, 750, 751, 752, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768, 769, 770, 771, 772, 773, 774, 775, 776, 777, 778, 779, 780, 781, 782, 783, 784, 785, 786, 787, 788, 789, 790, 791, 792, 793, 794, 795, 796, 797, 798, 799, 800, 801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813, 814, 815, 816, 817, 818, 819, 820, 821, 822, 823, 824, 825, 826, 827, 828, 829, 830, 831, 832, 833, 834, 835, 836, 837, 838, 839, 840, 841, 842, 843, 844, 845, 846, 847, 848, 849, 850, 851, 852, 853, 854, 855, 856, 857, 858, 859, 860, 861, 862, 863, 864, 865, 866, 867, 868, 869, 870, 871, 872, 873, 874, 875, 876, 877, 878, 879, 880, 881, 882, 883, 884, 885, 886, 887, 888, 889, 890, 891, 892, 893, 894, 895, 896, 897, 898, 899, 900, 901, 902, 903, 904, 905, 906, 907, 908, 909, 910, 911, 912, 913, 914, 915, 916, 917, 918, 919, 920, 921, 922, 923, 924, 925, 926, 927, 928, 929, 930, 931, 932, 933, 934, 935, 936, 937, 938, 939, 940, 941, 942, 943, 944, 945, 946, 947, 948, 949, 950, 951, 952, 953, 954, 955, 956, 957, 958, 959, 960, 961, 962, 963, 964, 965, 966, 967, 968, 969, 970, 971, 972, 973, 974, 975, 976, 977, 978, 979, 980, 981, 982, 983, 984, 985, 986, 987, 988, 989, 990, 991, 992, 993, 994, 995, 996, 997, 998, 999, 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010, 1011, 1012, 1013, 1014, 1015, 1016, 1017, 1018, 1019, 1020, 1021, 1022, 1023, 1024, 1025, 1026, 1027, 1028, 1029, 1030, 1031, 1032, 1033, 1034, 1035, 1036, 1037, 1038, 1039, 1040, 1041, 1042, 1043, 1044, 1045, 1046, 1047, 1048, 1049, 1050, 1051, 1052, 1053, 1054, 1055, 1056, 1057, 1058, 1059, 1060, 1061, 1062, 1063, 1064, 1065, 1066, 1067, 1068, 1069, 1070, 1071, 1072, 1073, 1074, 1075, 1076, 1077, 1078, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086, 1087, 1088, 1089, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098, 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109, 1110, 1111, 1112, 1113, 1114, 1115, 1116, 1117, 1118, 1119, 1120, 1121, 1122, 1123, 1124, 1125, 1126, 1127, 1128, 1129, 1130, 1131, 1132, 1133, 1134, 1135, 1136, 1137, 1138, 1139, 1140, 1141, 1142, 1143, 1144, 1145, 1146, 1147, 1148, 1149, 1150, 1151, 1152, 1153, 1154, 1155, 1156, 1157, 1158, 1159, 1160, 1161, 1162, 1163, 1164, 1165, 1166, 1167, 1168, 1169, 1170, 1171, 1172, 1173, 1174, 1175, 1176, 1177, 1178, 1179, 1180, 1181, 1182, 1183, 1184, 1185, 1186, 1187, 1188, 1189, 1190, 1191, 1192, 1193, 1194, 1195, 1196, 1197, 1198, 1199, 1200, 1201, 1202, 1203, 1204, 1205, 1206, 1207, 1208, 1209, 1210, 1211, 1212, 1213, 1214, 1215, 1216, 1217, 1218, 1219, 1220, 1221, 1222, 1223, 1224, 1225, 1226, 1227, 1228, 1229, 1230, 1231, 1232, 1233, 1234, 1235, 1236, 1237, 1238, 1239, 1240, 1241, 1242

— page 43 —
3. U.S.S. COBILA - First Patrol - report of. (continued)

H - ATTACK DATA

U.S.S. COBILA
Tino: C205 (-9)
Torpedo Attack No. Throo: Patrol Number ONI
Date: 18 July, 1944, Lat. 29-12N - Long. 139-10E

TARGET DATA - DANGER: IMPRINTED

DESCRIPTION:
Single throo island froi. thor similar to Kiso Maru,
Largo 131 ONI 1208-J - 4,070 tons, with two escorts -
IU. Contact made by radar, range 11,000 yards;
visibility by starlight, no noon.

SHIP SINK:
Kiso Maru - 4,070 tons.

DAMAGE DETRIMENT BY:
Two hits soon, hoard, and folt; target soon
to sink; pip disappeared from radar.

Target Draft - 24'
Own Ship Speed 12.8
Course 145
Course 250
Speed 6.5
Depth 24'
Range 2,400
Angle ---

TYPE ATTACK:
Radar surface. 1ip on radar range 11,000 yards so
co. anchored, 1. At 6,500 yards two smaller pips
appeared on his port bow and starboard quarter. 1st
6,000 yards could see him. Had [cod] soot-up on TDC,
had scoots well placed, and was on favorable track
so turned toward to attack. Shot four tubes forward
at 2,400 yards range, than turned away and cleared
area at flank speed. The whole attack from first
pip to sinking took less than one hour.

FIRE CONTROL AND TORPEDO DETACHMENT

|    | 1    | 2    | 3    | 4    |
|---|---|---|---|
| Tube    | 752    | 732    | 777    | 752    |
| Track    | 000    | 002    | 358    | 000    |
| Gyro    | 6    | 6    | 6    | 6    |
| Depth    | 6    | 6    | 6    | 6    |
| Power    | Hi. hi    | Hi. hi    | Hi. hi    | Hi. hi    |
| Hit-Miss    | No    | No    | No    | Bank    |
| Arrest    | No    | No    | No    | No    |
| Mk.Torpedo    | 23    | 23    | 23    | 23    |
| Serial    | 49232    | 49771    | 61663    | 52926    |
| Mk.Exploder    | 6-4    | 6-4    | 6-4    | 6-4    |
| Serial    | 8239    | 2876    | 8320    | 3202    |
| Actuation    | Contact    | Contact    | Contact    | Contact    |
| Actuall    | Contact    | Contact    | 16-1    | 16-1    |
| Actuall    | 16-1    | 16-1    | 16-1    | 16-1    |
| Mk.Warhead    | 13816    | 12720    | 13820    | 13800    |
| Serial    | Torpax    | Torpax    | Torpax    | Torpax    |
| Explosive    | 8    | 8    | 8    | 8    |
| Pirin    | 20    | 20    | 20    | 20    |
| Type    | Nonc    | Nonc    | Nonc    | Nonc    |
| Sea    | Caln    | Caln    | Caln    | Caln    |
| Condition    | Subm    | Subm    | Subm    | Subm    |
| Overhaul    | 1st.    | 1st.    | 1st.    | 1st.    |
| Remarks:    |

— page 44 —
U.S.S. COBI - First War Patrol - report of, (cont'd).

H - ATTACK DATA

U.S.S. COBI
Timo: 0700 (-9)  Dato 18 July, 1944.  Lat. 28-43N Lon. 139-24E

TARGET DATA - DANGER INFLICTION

DESCRIPTION:
Arizona Maru Class, (30) Paco 174 ONI 208J with one lar. o K on line of bearing escorted by one CHIDORI anchored, small escort on port side and 1,000 ton XK on sbd side. Sea calm, intermittent rain squalls and low clouds, visibility 30 miles between squalls.

SHIP SINK:
Arizona Huru Class - 9,500 tons.

DANGER DETERMINED BY:
Four hits soon and heard. Two at port side and two in starboard quarter at
sorrows. Target was listing when torpedoes hit in
storm. Roloed oracking up noises heard for about
10 minutes through hull and for about 20 minutes
through sound gear. When I came to periscope depth
at 1010, -12,000 yards from scene of attack - Her
get was not visible though he had been in plain
sight through periscope at 20,000 yards in the
morning. CHIDORI was in sight patrolling sea.
As I had observed two torpedo hits right in his
sorrows, don't believe he left sea again in a horizontal
plane, SHARK attacked what was apparently sun con-
voy next morning with only one large XK remaining.

Target Draft - 28'  Course 115  Spood 8  Range 900
Own ship Spood 2.8  Course 281  Depth 64'  Angle 1°down

TYPE ATTACK:
Submerged periscope. Target group emerged from rain
squall at range of about 18,000 yards, angle on bow
35° port. His air cover had not yet arrived. We
dove and hit the normal approach course. At 16,000
yards made out CHIDORI patrolling ahead, seen
type escort on port side and 1,000 ton XK patrolling
starboard side. Target was by far the largest thing
in the group and was the right ship of two large
XK's in line of bearing. Made approach on him.
Twenty-five minutes after sighting group sighted
toward putting in directly on track of large target.
Hooked toward and watched him zig to his right and
back again. By this time we were inside sorrows
and range was 2,500 yards. Angle on bow 40° port.
Figured he was due to zig left which would allow me
to put six fish into him and turn to give second
XK four aft. Though he had been zigging at 3 or 4
minutes intervals all morning, he held this one.
When run had closed to 900 yards forward, came
firing down the throat. Slammed to give him four

CONFIDENTIAL - 31 -  Snelosure (L).

— page 45 —
U.S.S. COBIL - First patrol - report of. (Cont'd).

TORRADO ATTACK FORM - Torpedo Attack Number TOUR. (Cont'd).

TY3 ATTACK: (Cont'd):

From the forward tubes and then turn out to let him
have the four aft but when the first fish hit just
after I fired the fourth one I realized I had him
down and figured I could put six into him from here
and still cut the other AK. Fired the remaining
two fish forward with careful set up. The run had
come down to 690 yards by the time the fourth fish
went out and the only exploit of for 4,5, and 6
missing is that they ran under. Swung left to fire
storm at other AK. Howover, when 4,5, and 6 did
not hit decided I had better finish off the bird in
hand. Fired my hits would have slowed him down
so our his speed to 3 knots. This was a mistake.
Fired for 5-30-45, and 5-30-45, and 5-30-45, and
0-43-0-45, with a head bearing for each shot. Ob-
served the two fish spread 4R hit him right in the
servos.

He had manned his bow gun and was firing wildly all
over the lot. The small AK ranged up his port side
and started dropping charges. The charges on the
fantail of the target were blown off and we sounded
to 300 feet with a 21 charge salute missing, a lot
of correction wall astern.

FIR. CONTROL AND TORRADO DATA:

| Tube | 1 | 2 | 3 | 4 | 5 | 6 |
|-------|----|----|----|----|----|----|
| Track | 5 | 5 | 5 | 5 | 5 | 5 |
| Gyro | 609 | 009 | 010 | 009 | 009 | 010 |
| Depth | 12 | 12 | 12 | 12 | 12 | 12 |
| Power | High | High | High | High | High | High |
| Hit-Miss | No | No | No | No | No | No |
| Arrest | No | No | No | No | No | No |
| Mk.Torpedo | 23 | 23 | 23 | 23 | 23 | 23 |
| Serial | 53009 | 49250 | 52939 | 49004 | 26847 | 53208 |
| Mk.Exploder | 6-4 | 6-4 | 6-4 | 6-4 | 6-4 | 6-4 |
| Serial | 2373 | 8005 | 3847 | 3284 | 1790 | 168 |
| Location Set | Contact | Contact | Contact | Contact | Contact | Contact |
| Location | Contact | Contact | Contact | Contact | Contact | Contact |
| Mk.Torpedo | 1-1 | 1-1 | 1-1 | 1-1 | 1-1 | 1-1 |
| Serial | 13833 | 13789 | 12729 | 13790 | 10288 | 3925 |
| Explosive | Torp | Torp | Torp | Torp | Torp | Torp |
| Firing Interval | 8 sec. | 8 sec. | 8 sec. | 13sec. | 14 sec. | 19 sec. |
| Type Spread | None | 1/Div. | 1/Div. | 1/Div. | 1/Div. | 1/Div. |
| Sea Condition | Calm. | | | | | |
| Over-rheul. | Submarine | Basso, | 2-cr. Heaber, T.H. | | | |
| Remarks: | # 4,5, and 6 probably ran under target as all | | | | | |
| | date shows they should have hit if 4 and 2 did. | | | | | |
| | Run had closed to 690 yards by time 4 was fired | | | | | |
| | and was shorter for 5 and 6. | | | | | |
| | Impulse pressure | | | | | |
| | used was 300/ and ejection was normal. |

— page 46 —
A - Arizona Maru
: B - Large Able King
: C - Small Able King
: D - Chidori
: E - Sampan

CONFIDENTIAL

32a

Molosure (A)

MOLOSURE (A)

— page 47 —
U.S.S. COBL. - First or Patrol - report of. (Cont'd)
TORPEDO ATTACK FORM - Torpedo Attack Number FOUR. (Cont'd)
Fire Control and Torpedo Data - (cont'd)

Tube 7 8 9 10
Track 144S 150S 148S 154S
Gyro 223 229 227 233
Depth 12 12 12 12
Row 12 12 12 12
Hit-Miss 18 18 18 18
Erative 18-1 18-1 18-1 18-1
Mr.Torpedo 18-1 18-1 18-1 18-1
Serial 55242 54956 55095 54366
Mr.Exploder 8-5 8-5 8-5 8-5
Serial 8294 8220 7970 8044
Actuation Set Contact Contact Contact Contact
Actual Actuation 18-1 18-1 18-1 18-1
Mr.Warhead 18-1 18-1 18-1 18-1
Serial 1462 1863 2202 1776
Explosive Torpex Torpex Torpex Torpex
Firing Interval 0 10 13 12 12
Type Spread 4R 0 4R
Sea Condition Calm Submarine Base, Pearl Harbor.

CONFIDENTIAL - 33 - [Unclosuro (i).]

— page 50 —
U.S.S. COBIA - First War Patrol - report of. (Outt'd)
    • H - ATTACK DATA
U.S.S. COBIA: Gun Attack Number ONE Patrol Number ONE
Time: 2250 (-10) Date: 6 July, 1944. Lat.28-25N Long.151-46E
TARGET DATA - DAMAGE INFLUENCED

Sunk: XAK 400 ton convarted trawler, coastal minesweeper.
Similar to center picture, patrol craft, ONI 41-42,
radio equipped, armed with depth charges and machine
guns. - 20.

DAMAGE DETERMINED BY: Left blazing amidships and aft. Exploded
and sunk as we were leaving scene of action.

DETAILS: Sighted by lookout at 12,000 yards in bright moonlight
lying to on surface. He was identified as converted
trawler with high radio meshes. Could see no large guns,
so manned dock gun and closed to 5,000 yards. Opened
fire. He turned away and ran so closed him firing 2
or 3 shots every 500 yards. Made 2 or 3 hits with no
apparent effect. At 2,800 yards hit with high capacity
shell knocked off his bridge, stack, and guns and set
his dock house afire. He lost control and weaved
orazily. Sound had his screws and we traoked him at
8 knots. At 2,000 yards we stopped him with another
high capacity hit. Closed to 700 yards using 4", 20mm
and 50 calibers. He caught fire midships and aft and
the ammunition in his magazine aft began exploding.
He had two depth charges topside. Those exploded as
we cleared the area and his sunk. He was picked up by
radar at 9,000 yards.

Expended: 4" - 54 rounds.
20mm - 1320 rounds.
50 cal. - 260 rounds.

SJ radar ranges were used until he was at point blank
range.

CONFIDENTIAL - 36 - Emolosure (L).

— page 51 —
U.S.S. CORLA - First War Patrol - report of. (Cont'd).
H - ATTACK DATA:
U.S.S. COBLA: Gun Attack Number TWO Patrol Number ONE:
Time: 1942 (-9) Date: 20 July, 1944. Lat.28-10N Long.141-32S

TARGET DATA - DAMAGE INFLICTED:

SUNK: One 600 ton patrol vessel flying Jap naval ensign, one 300 ton and one 150 ton trawler.

DAMAGE DETERMINED BY: Left patrol vessel riddled with 4", 20mm and 50 cal. fire, and blazing fore and aft, sanding up loud explosions intermittently, and lighting up the whole horizon with its glow. One trawler exploded and disappeared when hit by 4". Last trawler left blazing fore and aft leaking burning oil from numerous bullet holes and sinking after ramming COBLA.

DETAILS: After torpedo attack No. 5 withdrew to 6,000 yards on quarter of target group and manned all guns. The largest target had taken position between us and the other two so we attacked him first. Closed range on constant bearing keeping him well on bow to prevent his turning. In and ramming. Commoned firing as soon as he was in sight at gun - range 1,000 yards. Sprayed him with 50 cal. "at" gun - range 1,000 yards. Shuttlecocks took fire with 50 Cal. fire swept all personnel from the docks. After nine minutes he was flaming fire and aft and sinking. He flew a Jap naval ensign which would have been a real prize to bring back but it too, went up in the conflagration. During our firing on the patrol vessel the two trawlers were prodding about 50 yards apart on parallel course. We attacked the nearest of the two. After four minutes a 4" high capacity shell hit him and he disintegrated in a cloud of smoke and steam. Had kept on quarter of this group while firing to prevent ramming but last trawler took advantage of the smoke screen presented by his exploding peridner to turn and head in to ram. As he came out of smoke cloud I gave right full rudder and went ahead flank in an attempt to make the best of a bad situation. Had secured the 4" gun and put crew under cover when the second ship blew up as we were getting close enough for real execution by machine guns and I didn't want too many men exposed. Both 20mm guns and 50 cal. guns took this occasion to jam. The trawler came on in with a machine gun firing wildly from his bow. We had picked up enough speed and gotten far enough around when he hit so that damage was nongligible. His bow sprit crumpled up against our armored bridge. He

CONFIDENTIAL - 37 - Enclosure (A).

— page 58 —
6.1C7 6.1C7 Video - deflection
V7 6.1C7 PPI Video
V8 6.1C7 Grid Video
V2 6SN7-GT Main sweep and sweep cathode follower.
I.F. 6.1C7 Regulator lamps.
V201-207 6.1C7's(7) I.F. tubes.

TRANSMITTER
V10 705L Rootifier (diode)
RADIO UNIT
V506 6.1C7 Pulse amp & shapor tubes.
V507 6.1C7 "

— page 60 —
0 - DENSITY LAYERS

It all times distinct negative gradients varying from 2-6 degrees were available above three hundred feet and about 20 percent or the time more than one layer was encountered although the deeper ones wore smaller. In all cases the bethythomorph line showed a general and gradual trend of temperature decrease with increased depth.

P - HEAVY, FOOD AND HABITABILITY

Health was generally good. Vitamin pills were extensively used and sun lamp treatments to a lesser degree. Four cases of pulse pediculli wore discovered and cured with campho-phenique hair were through the patrol. One man had an abscess alveolar and treated with sulpha-thiazole pills.

Five cases of gastro enteritis, one acute, were treated with emphogel. The worst case started two days after our severest death choring, put one man in bed for three days, and was treated with tincture of bolidonne e well as amphogel. The other four were treated during the three days following our gun action with the patrol vessel and two tra-lers. One case of pyconneurrosis anxiety developed during depth charge attack. Though the subject man was able to perform his duties during the attack his obvious strain affected several other members of the crew. He requested a transfer to surface craft.

Only one severe injury was sustained during the patrol when a lookout slipped and located the lookout was incapacitated for only one day.

The food was varied and well prepared. However the lack of fresh frozen food, available until the Midway mer Pearl Harbor, and of fresh potatoes was keenly felt. 1,800 pounds of fresh potatoes were loaded at Pearl Harbor; 1,000 pounds of these potatoes were loaded at Midway, but those extended the endurance of fresh potatoes to only a few days beyond the patrol.

Habitability was good. At times the air conditioning could not cool the boat forward of the control room. It is strongly felt that the addition of an air conditioning coil in the after end of the forward battery would be of great benefit in alleviating this.

CONFIDENTIAL - 44 - Enclosure (i).

— page 61 —
U.S.S. COSTA - First War Patrol - report of. (uomd)

Q - PERSONNEL

Korale was high throughout and the conduct of the personnel uniformly excellent. The new men making their first run reacted admirably and it is felt that an exceptional class of personnel is entering the submarine service now. DeVAY, R.F., F2c, USN, is being recommended in separate correspondence for a Bronze Star medal for his action of July 20.

Three record players were given a thorough workout; the Dulore ice cream mixer operated satisfactorily; the cocoa cola mixer lasted until the last two weeks of the patrol when the CO2 supply gave out; and movies were held in the forward torpedo room at regular intervals.

Qualification classes were held at 1030 and 1400 every day in the crews mess for all unqualified men. The following information is submitted:

(a) Number men aboard 70
(b) Qualified at start of patrol 44
(c) Qualified at end of patrol. 59
(d) Advanced in rating. 12
(e) Less than two years service 25
(f) More than 6 years service 10
(g) Unqualified making first run 26
(h) Average officer age 26
(i) Average chief age 33
(j) Average crew age 22

All men who had been qualified on other boats were required to requalify on the COSTA with the notebook requirement waived. 29 of the 44 qualified men were thus requalified, and it was amazing how much brushing up was needed in some cases.

R - METERS STAMPS

Pearl Harbor to Midway 1485 miles 15,872 gallons. Midway to area 2434 miles 24,243 gallons. In area 4910 miles 44,006 gallons. Area to Majuro 2409 miles 15,178 gallons.

S - DURATION

Days Pearl Harbor to Midway. 4 day. Days Midway to area. 7 days. Days in area. 29 days. Area to Majuro. 8 days. Days submerged. 25 days.

T - FACTORS OF DURANCE

Torpedoes 2
Fuel 20 days
Provisions 15 days
Personnel Factor 15 days
CONFIDENTIAL - 45 - Enclosure (A)

— page 63 —
PB5-102/A16-3
Serial (049)
C-0-N-P-I-D
DECLASSIFIED
FIRST ENFORCEMENT TO
CO COBIA Report of
First War Patrol.

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

Subject: U.S.S. COBIA - First War Patrol - Comment on.

1. The first war patrol of the COBIA was conducted off the Bonin Islands. Twenty-nine days were spent on station out of a total of forty-eight days from port to port.

2. The area was well covered and every opportunity to inflict damage on the enemy was explored exhaustively and with outstanding success:

ATTACK No. 1.

An armed enemy patrol vessel of 400 tons, sighted in the moonlight at a range of 12000 yards, was engaged on the surface and sunk by gunfire. Radar ranges were used for fire control. This attack took place on July 6, two days prior to COBIA's arrival in the patrol area.

ATTACK No. 2.

On July 9, a submerged attack on a coastal mine layer was frustrated when a screening plan obtained a near miss on the submarine at periscope depth. The resultant shock deranged the torpedo control mechanism and the one torpedo fired ran wide of the target. COBIA was counter-attacked by the PUBUKI escort over a period of one hour during which 26 depth charges were dropped.

ATTACK No. 3.

On the morning of July 13, one of a pair of naval auxiliaries, carefully identified as AFI's of the NOSHIMA MARU class, was sunk with two well placed torpedo hits from a bow salvo of three shots. Both hits were observed by periscope and although the target was not seen to sink, there is very strong evidence that it did. COBIA withstood a counter-attack of 45 charges dropped by the three escorts.

— page 64 —
1. FBS-102/A16-3
: Serial (049)
: C-O-N-F-I-D-E-N-T-I-A-L
: Subject: U.S.S. COBIA - First War Patrol - Comment on

ATTACK NO. 4.

An escorted freighter, identified as similar to the KISO MARU, was attacked with four torpedoes on the surface on the night of July 17-18. Two white were obtained and the target was observed to sink within five minutes. COBIA turned away after firing and eluded the escorts without difficulty.

ATTACK NO. 5.

Early the next morning, COBIA again demonstrated her mettle with an all out submerged attack on a large freighter of the ARIZONA MARU class. Six bow shots down the throat produced two hits. The submarine then swung off the track and fired her four stern tubes to obtain two more hits, this time in the screws C' the target. The three escorts, led by a CHIDORI, applied a charge treatment to COBIA's hull during the next hour, but little material damage was sustained. The decision of the commanding officer to concentrate his torpedoes upon the one large target rather than share them with the accompanying AK, is considered sound, and there is strong evidence that this ARIZONA MARU sank.

ATTACK NO. 6.

A night surface torpedo attack on July 20 during which two torpedoes ran under the target, was converted into a gun battle. Three small, armed vessels were destroyed during a half-hour fight, characterized by expert work on the part of the COBIA gun crews. During this engagement, COBIA was rammed amidships by one of the trawlers but a quick turn away reduced the collision to a glancing blow which prevented the submarine hull from being punctured. Superstructure framing and plating in the vicinity of frames 52 to 56, port, were stove in and the outer hull was dimpled between frames 55 and 56.

ATTACK NO. 7.

The final attack of the patrol occurred on August 5, when COBIA intercepted a converted yacht and quickly dispatched it with one torpedo hit in the stern. A minute later, the sinking vessel was strafed by our own aircraft. COBIA then surfaced and selected a sample prisoner from the score of uniformed Japes floundering in the water; he turned out to be a Sea Bee.

— page 66 —
15-10/A16-3
Serial 022
COMBAT REPORT
SUBMARINE SQUADRON TEN
CO CODIAL report of
First Star Patrol.

From: The Commander Submarine Squadron Ten.
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. CODIAL - First air patrol - Consorts on.

1. Forwarded, concurring in the remarks and recommendations contained in the first endorsement.

2. CODIAL's first air patrol was characterized by a... (text cut off)

3. The current procedure in reconnaissance was... (text cut off)

4. The commander's first air patrol was... (text cut off)

5. The first air patrol was... (text cut off)

6. This is the second submarine within a week to arrive in Japan after a successful first patrol, for refit and administration by this squadron. Other new submarines seem to be doing well, also. The whole appears to be good evidence that our basic training methods are sound.

7. Commander Submarine Squadron Ten congratulates the commanding officer, officers and men for an excellent patrol.

Copy to:
Consubdiv 102.
CO CODIAL.

G. L. RUSSELL.

— page 67 —
1-AP (HIIJIS NOSHIMA) (EC) - 8,800 tons (Attack No. 2)
1-1- Medium AK (EU) - 4,000 tons (Attack No. 3)
1-1- Large AK (ARIZONA) (EU type) (EC) - 9,500 tons (Attack No. 4)
1-1- SMC (Patrol Vessel) (EC) - 500 tons (Attack No. 6)
1-1- MIS (Converted Trawler) (EC) - 400 tons (Gun Attack No. 1)
1-1- SMC (Patrol Vessel) (EC) - 600 tons (Gun Attack No. 2)
1-1- MIS (Trawler) (EC) - 300 tons (Gun Attack No. 2)
1-1- MIS (Trawler) (EC) - 150 tons (Gun Attack No. 2)

TOTAL SUNK: 24,250 tons

Distribution and authentication on following page.

C. A. LOCKWOOD
RETURN TO F-4253

EXTRA: ORIGINAL
SORG. MICRO
PHOTO-LAB. OP-16

— page 68 —
12-10/416-3(15)/(16)
Serial 01843
DECLASSIFIED
FIRST REPORT TO
JOHN H. HYNES, 2nd,
Flag Secretary.

NOTE: THIS REPORT WILL BE
DESTROYED PRIOR TO
ENTERING PATROL ARG.
SUBJECT: U.S.S. COBIA (SS245) - Report of First War Patrol.
(26 June to 14 August 1944).

SUBJECT: U.S.S. COBIA (SS245) - Report of First War Patrol.
(26 June to 14 August 1944).

DISTRIBUTION:
(Complete Reports)
ComInCh (7)
GIN (5)
GinSubS (6)
Intel.Cen.Pac.Ocean Areas (1)
ComServPac (1)
GinClant (1)
ComSubSesPac (2)
S/L School, NL (2)
ComSoPac (2)
ComSubSosWesPac (2)
CTF 72 (2)
ComNorPac (1)
ComSubsPac (2)
SUND, MT (2)
ComSubsPacSubOrdCom (3)
All Squadron and Division Commanders, Pacific (2)
SubsTrainPac (2)
All Submarines, Pacific (1)

E. L. HYNES, 2nd,
Flag Secretary.

— page 69 —
1. The Commander, U.S.S. COSTA S3245 - Report of War Patrol
To: The Commander, U.S.S. COSTA S3245 - Report of War Patrol
Via: (1) The Commander, U.S.S. COSTA S3245 - Report of War Patrol
(2) The Commander, U.S.S. COSTA S3245 - Report of War Patrol
(3) The Commander, U.S.S. COSTA S3245 - Report of War Patrol
(4) The Commander, U.S.S. COSTA S3245 - Report of War Patrol

Subject: U.S.S. COSTA S3245 - Report of War Patrol
Enclosure: (A) Subject Report.
(B) Track Chart for ComSubProc.

1. Enclosures (A) and (B) covering the SECOND War Patrol of this vessel conducted in the Luzon Strait area during the period 6 September to 5 November, 1944, are forwarded herewith.

A. L. BECKER.

DECLASSIFIED-ART. 0445, OPNAVINST 5510.10C
BY O.O-0929 C-DATE 3/25/72

DECLASSIFIED

1 0652

— page 70 —
U.S.S. 3031A
A - RECLASS
Arrived -ajuro from First War Patrol.
Convenced refit.
Conducted refit, no major repairs.
Convenced training period including torpedo approaches, firing three torpedoes, battle surface and in-
dicational depth charge.
Ready for sea.

B - NARRATIVE
Soutember 5, 1944.
0753 L Underway from U.S.S. 3031A.
0833 L Deported lajuro Lacoon.
1235 L Released escort.
1525 L Plane on SD radar (aircraft Contact #1).
1630 L Sighted plane (aircraft Contact #2).
1725 L Submerged.
1759 L Surface.

Soutember 7
0033 L Plane on SD radar.
0425 L Sighted ship, distance 12 miles, (ship Contact #1).
0955 L Sighted plane (aircraft Contact #3).
1016 L Submerged.
1035 L Surface.
1206 L Sighted U.S.S. 3031A. RCN U.S. bearing 065°T, (Ship Contact #2).
1511 L Submerged.
1521 L Surface.

Soutember 8
0957 L Submerged.
1022 L Surface.
1715 L Deported lajuro North Safety Lane.

CERTIFICATE
1
"nclosuro (A).

— page 71 —
3.5in. 303L - Second year patrol - report of. (Cont'd)
September 9
0620 L Passed ake Island abeam to starboard, bearing 0000m, distance 17 miles.
1014 L Submerged.
1720 L Surfaced.
September 10
0458 L Submerged.
0517 K Surfaced.
0905 K Sighted plane (aircraft Contact #4). Submerged.
0934 K Surfaced.
1215 K Sighted plane (aircraft Contact #5). Submerged.
1303 K Surfaced.
1623 K Submerged.
1800 K Surfaced.
September 11
0024 K Attored Saipan east safest lane.
1430 K Submerged.
1500 K Surfaced.
September 12
0748 K Sighted plane (aircraft Contact #5).
0850 K Sighted plane (aircraft Contact #7).
1408 K Sighted several planes (aircraft Contact #8).
1410 K Submerged.
1450 K Surfaced.
1615 K Sighted plane (aircraft Contact #9).
1616 K Submerged.
1631 K Surfaced.

CONFIDENTIAL
2
Anelousuro (A)

— page 72 —
3
U.S.S. COSTA
Second Patrol - report (Cont'd).
September 12 (Cont'd)
1735 K Sighted plane (aircraft contact #10).
2256 K Sighted Sarigan Island distance 39 miles.
2300 K Sighted Antaian Island distance 43 miles.
September 13
0534 K Made rendezvous with U.S.S. CASPIAN. (ship Contact #3).
0928 K Sighted periscope (ship Contact #4). Periscope was sighted by one lookout who was sure of its identity. CASPIAN searched area while a second escort took us into Sejane.
1435 K Hoorod to U.S.S. HOLLAND, Panama Harbor, Sejane. Recieved 35,000 gallons of fuel oil, accomplished minor voyage repairs.
September 14
1000 I U.S.S. SHOCK moored alen.side.
September 15
1630 I Underway from U.S.S. HOLLAND in company with U.S.S. SHOCK.
2210 I Relcased escort. Entered Sejane 1st Safety Lane.
2225 I Submerged.
2255 I Surfaced.
September 16
0545 I Sighted plane (aircraft contact #11).
0600 I Sighted plane (aircraft contact #12).
1000 I Submerged.
1014 I Surfaced.
1400 I Conducted radar tracking on SK OK.
1545 I Sighted plane (aircraft contact #13).
2000 I Deported Saipan 1st Safety Lane.
1 0682

CONTENTS:
3
Inclosure (a)

— page 73 —
U.S.S. COSTA - Second War Patrol - report of. (Cont'd)

September 17

1018 I Submerged.

1025 I Surfaced.

1316 I Nade submerged approach on 3C0K.

1344 I Surfaced.

September 18

1035 I SD contact, 24 miles (Aircraft Contact #14).

1313 I Submerged and made approach on 3NCK.

1350 I Surfaced.

September 19

0155 I Intercept Convoy College Safety Zone.

1116 I SD contact, 24 miles (Aircraft Contact #15).

1330 I Submerged and made approach on 3NCK.

1353 I Surfaced.

1401 I SD contact, 13 miles (Aircraft Contact #16).

September 20

0310 I Sighted light bearing 020°T. (Ship Contact #5).
Picked up ship on 3J radar at 35,000 yards and
co. enco. tracking. Closed until I could definitely
make him out as a properly marked hospital ship heading
toward Balingen Channel. Lot him open range so as
not to be sighted at sunrise.

0640 I Sighted smoke on bearing of hospital ship still heading
for Balingen Channel.

0930 I Sighted Batian Island. Bearing 270°T.

0945 I Sighted Balingen Island.

1205 I Plane - Davo, aircraft Contact #17 - came out of
clouds, distance 4 miles. submerged.

1207 I Plane dropped two bombs, one close. Stayed deep for an
hour and a half and near two distant depth charges or
bonos.

SURVEYOR'S SIGNATURE: [signature]

4

Inclosure (a)

— page 74 —
3.3.303A Second Ier Patrol - report (Cont'd)
September 20 (Cont'd)
1548 I Sighted plane - Lavia, (Aircraft Contact 918). Distance 10 miles, apparently searching for us.
1918 I Surfaced. Found numerous bomb fragments scattered around the dock.
2100 I SJ radar contact. (Ship Contact 6). Changed calls with U.S.S. ZICUD.
September 21
0637 I Sumerged on track of numerous convoys contacted during summer of '44. Headed for west part of area.
1400 I Surfaced for a high look around.
1550 I Sumerged.
1925 I Surfaced.
2316 I Entered area.
September 22
0710 I Sumerged on track of convoys between Long Long and Manila.
1247 I Surfaced for a high look around.
1446 I Sumerged.
1902 I Surfaced. Headed toward Manila.
September 23
0715 I Sumerged in area of recent contacts by SHILION and ZONATTO.
1115 I Surfaced for high look around.
1334 I Sumerged.
1940 I Surfaced. Headed west toward Manila.
September 24
0726 I Sumerged near 100 fathoms curve off Manila.
1246 I Surfaced for high look around.

1 0682
5
...inclosure (A)

CERTIFICATE
5

— page 76 —
0652 I  Submerged.
0700 I  Decoded block toward west end of crew to patrol track of second enemy sub.
2010 I  Surfaced. Patrol led toward east end of crew.
September 29
0706 I  Submerged on probable track of enemy sub.
1930 I  Surfaced. Headed toward east end of crew.
September 30
0730 I  Submerged.
1047 I  Surfaced. Headed for no. area.
1529 I  Submerged.
1941 I  Surfaced.
2245 I  Sighted Arctas Island, distance 0,300 yards.

October 1
0500 I  Entered no. area.
0645 I  Submerged. Very overcast so did not surface at mid-day.
1910 I  Surfaced.
2352 I  Sighted plane, close (aircraft Contact #19) submerged. He dropped his first bomb close then he were passing 100 feet and shook up up considerably; cork, paint and a few bolts flew around and several light bulbs were broken out no major damage. He dropped two more a couple of minutes later out those were well clear. All hit after diving alarm and picked up ready close aboard on 144 torpedoes.

October 2
0224 I  Surfaced.
0630 I  Submerged. Closing west coast of Formosa.
1338 I  Sighted plane (aircraft Contact #20).

CONTINUED ON NEXT PAGE

7  | 10 0622

— page 77 —
0.5.0.3A - Second Operator Report of (00d)

October 2 (Cont'd)

1905 I Surfaced.
2003 I Sighted plane (aircraft contact #21); submerged.
2027 I Surfaced.
2028 I AAR short close radar on 250 meters, submerged.
2110 I Surfaced. Two radars on AAR one at 150, one at 250.
2123 I The radar on 150 messages had stopped sweeping, was close, and was steady on us, submerged.

October 3

0150 I Surfaced.
0235 I The radar plane stayed on us again and getting louder, submerged.
0335 I Surfaced. AAR still had a radar but very faint.
0617 I Finally got our battery charge in. Submerged.
1903 I Surfaced. Hacked through Bashi Channel.
2340 I Radar close to AOR. Submerged.

October 4

0225 I Surfaced.
0522 I Submerged. Zavrola is on the end of Bashi Channel.
1513 I Surfaced. Opened Bashi Channel to east and sent message requesting missed Skods.

October 5

0033 I Losses sent. Reversed course to patrol Bashi Channel.
0610 I Submerged. Headed through Bashi Channel.
1104 I Sighted Yami Island at south end of Bashi Channel, bearing 1500T.
1905 I Surfaced. Hacked toward west part of area. SJ Radar "A" scope out of communication due to failure of High Voltage transformer in range unit.

COURTESY: TTLI

8
Inclosure (A)

— page 78 —
U.S.S. COSTAL - report (Cont'd)
October 6
0610 I S.S. Costal mountain tops of Formosa during 0150T.
0615 I Sunmorgod, covering lane south of Tekko.
0504 I Sighted plane (aircraft contact #22).
1626 I Sighted plane (aircraft contact #23).
1910 I Surfcoed. Fooded toward west part of area.
October 7
0208 I Close steady radar, sunmorgod.
0344 I Surfcoed.
0623 I Sunmorgod covering traffic land south west of Tekko.
0844 I Sighted plane (aircraft contact #24).
1915 I Surfcoed. Headed toward west part of area.
October 8
0643 I Sunmorgod. Patroloid route south west of Tekko.
1905 I Surfcoed. Headed toward south east part of area to cover route south of Tekko and west of Jashii Channel.
October 9
0530 I Sunmorgod covering Tekko - Jashii Channel.
1052 I Sighted plane (aircraft contact #25).
1915 I Surfcoed.
2150 I Headed toward east to cover probable course of contact reported by dingo toward Jashii Channel.
October 10
0338 I Sighted North Island bearing 1000T, 17 miles.
0349 I Patroloid Jashii Channel.
0513 I Submerged patrol. Jashii Channel.
1216 I Sighted two masts bearing 2970T. (Ship Contact #8). Turned to normal cy route and pulled nard. Contact

GENERAL:
9
Nucleosure (a)

— page 79 —
35.3. COSTA - Second War Patrol - report of. (Cont'd)

October 10 (30th'd)

turned out to be one silico

— page 80 —
U.S.S. CODA - Second War Patrol - report of (Cont'd)
October 13 (Cont'd)
0812 I S.S. U.S.S. CODA vessel (Ship Contact #9) bearing 1210T, distance 10,000 yards. Underway close to shore.
1903 I Surfaced.
October 14
0645 I Surferged in rough sea and headed on various courses trying to reinitiate patrol.
1919 I Surfaced.
October 15
0600 I Radar contact bearing 1700T, distance 6 miles (Ship Contact #10). Turned to close and track. No was a small auxiliary seahorse and turned into Dilligue Inlet south of Cape Sjoedar a few minutes after sighting.
0624 I Submerged. Patrol led north of Cape Sjoedar.
1925 I Surfaced.
October 16
0618 I Submerged north of Cape Sjoedar.
0722 I Sighted small fishburn (Ship Contact #11) range 13,000, bearing 1830T, making north coast of Luzon.
1125 I Sighted two Vals and one T. look plenitude distance 10 miles (aircraft Contact #30).
1143 I Cno plane close and turning toward us. Went deep for 20 minutes.
1223 I Sighted ship bearing 1500T, range 12,000 yards, (Ship Contact #12), 900 starboard and the other on the bow. A higher look shore to us to do who same group we saw in the Bashi Ch. inoll, one tr.nsport, one DD. Pulled hard in hopes that he might zig, or anchor at Bangui.
1440 I Close enough to Bangui to see beach and no ship. Turned away.
1932 I Surfaced. Cleared coast to put in course, then headed south for close and search of beach to see if ship had anchored off Laos.
2235 I Right glov on horizon in direction of Luzon. Apparently our numbers are doing a through job.

CONTINUED ON NEXT PAGE
11 1062
11 1062
CONTINUED ON NEXT PAGE

— page 82 —
13
U.S.S. 5031A
Dockyard War Patrol - report (Cont'd)
Oct. 22 (Cont'd)
1100 I
surfaced.
1109 I
Sighted life boat which proved to be full of Jap survivors including known Hons I close at.
1139 I
Sighted two J's on a raft. Closed canyoked them up, an army sergeant and a corr. They said their names were Sato Takaru and Toruaki Hoshishi; that they had been torpedoed by a sub; and that their ship had been shot to rubble harm.
1253 I
Sighted two planes (Aircraft Contact #33). Submerged.
1320 I
surfaced.
1704 I
Sighted two small vessels, thin high scopa. (Ship Contact #13) -- appeared to be about 500 ton coasters. Turned to normal course to get ahead and invest. state.
1708 I
Sighted plane (aircraft Contact #34). Submerged. No torpedo four boats on us, two fairly far away and two very far. Salivo these to small coasters with air cover to do sun-rinse trip. Turned away. On first periscope I look saw the plane again turning to a zoro and I to on him now. -- sent to 150 ft. for an additional half hour.
2045 I
Reached recognition signals with U.S. Sub. (Ship Contact #15).
2240 I
Entered I'moro Strait.
Oct. 23
0127 I
Reached through narrows of Iimoro Strait. Entered Sulu sea.
0154 I
Reached recognition signals with unknown U.S. Sub. (Ship Contact #15).
0356 I
Reached recognition signals with U.S. Sub. (Ship Contact #16).
1754 I
Sighted one Jako (aircraft Contact #35), submerged.
1906 I
Surfaced.
Oct. 24
0549 I
Passed Zorri Bank about to starboard.

CONTINUED ON NEXT PAGE

— page 83 —
U.S.S. 0031 - Second Torpedo Attack Report of (date)

October 24 (Cont'd)

0509 I: Submerged between 2-arl 3ank and Tavi Tavi Island. Patrol. 1od north of 3i.utu passage.

1926 I: Surface. Headed through Sibuitu passage.

2000 I: PR. 3inorod radar at 1.0 megacycles strong can steady on us. 1ado complete circle in an attempt to get a bearing on the scource of this radar. 3earing sheet radar to be on northern end of Sibuitu Island.

2041 I: Passed 3ongau Island, distance 0 miles; entered Sibuitu passage. 3ep radar secured.

2045 I: Sighted small boat about the size of a PT boat, (Ship Contact #17) range 10,000 yards, heading in our direction. Turned away at full speed. Apparently he didn't sight us as he passed us and went north through Sibuitu passage.

2132 I: Sighted small boat, (Ship Contact #18), some size as a PT boat again, distance 9,000 yards. Reached away again, and waved him.

2140 I: Well clear of patrol boat, completed transit of Sibuitu passage.

October 25

0013 I: Reached to.ard 1.0 fathom curve in Sibuitu Bay.

0521 I: Submerged.

0658 I: Our first look at 1.1tad small fishing boat than a small freighter (Ship Contact #19) heading north inside 100 fathoms curve. Turned to normal approach and pulled hard but he passed out of sight to north-east well inside reef.

1125 I: Sighted motor boat inside 100 fathom curve (Ship Contact #20).

1308 I: Sighted ship heading north range 10 miles, on bow 90°3, One motor boat between us and target. (Ship Contact #21).

1420 I: Sighted another fishing boat south of Benda reef (Ship Contact #22).

1530 I: Raided out from coast.

1911 I: Surface. Cleared coast then he did for point assigned us during Tarekan air strike.

CONTENTS: TITIAL 14 Inclosure (a)

— page 85 —
1707 I
Closer look showed a small saury. surfaced and rammed all battle stations. Closed to see if he crew Jap, armed, or equipped with radio.

1736 I
Turned out to be motive. Heard toward London Strait.

2040 I
Sighted another sailing fisherman (Ship Contact 25).

October 30

0545 I
Sighted small sailing vessel (Ship Contact 20).

1340 I
Sighted toys of London Island, bearing 1679T.

1514 I
Sighted sailing fisherman, range 9 miles (Ship Contact 27), submerged. He was probably the radio equipped spy referred to by H.M.C.D in a recent message.

1942 I
Surfaced. Headed through London Strait at full speed.

2150 I
Sighted and made radar contact on petrol vessel, (Ship Contact 28), bearing 1700T, range 6,000 yards. Headed slightly away and put him about 10 knots. A few minutes while the TDC tracked him at 10 knots. A few minutes later made out a long, low-lying ship apparently a sub on the exo-suite of the channel. This patrol boat seemed not so much trying to close us as trying to force us toward the tailings sub, No fired any red an iron flares and bursts of explosive ammunition from some rapid fire weapon. However instead of turning away, I kept the patrol boat about the boat and headed for the strait. Left the patrol boat ashore. Shore batteries from south-west of London opened fire. Many flares from petrol boat to direct fire; closest splash was about 5,000 yards short. Apparently 2,000 yards firing blind covering middle of channel with area fire. After about 25 rounds firing ceased.

CONFIDENTIAL 16
Enclosure (A)

— page 86 —
11/4/41 11:00 AM
U.S.S. JOSHUA
Second War Patrol - report of (Cont'd).

October 31

1142 I
Sighted and exchanged calls with U.S.S. SABRA.
(Ship Contact #29).

1328 I
Sighted and exchanged calls with U.S.S. RAMPIN.
(Ship Contact -30).

November 1

1104 H
Submerged.

1120 F
Surfaced.

1040 F
Sighted and exchanged calls with U.S.S. LACK. (Ship Contact #31).

1813 F
Sighted and exchanged calls with U.S.S. FRODO. (Ship Contact #32).

1935 F
Sighted and exchanged recognition signals with U.S.S. SUBARINO (Ship Contact #33).

November 2

1545 H
Submerged.

1018 F
Surfaced.

November 3

1125 F
Submerged and hold emergency drills.

1350 H
Surfaced.

— page 88 —
1:42:25 9/7 11-17:U.S. Jd or DD: 23,000 240 16
  : (-11): 170-32: 15,000 075 15
  : 2:12:06 9/7 12-40:U.S. Sub. 30,000 180 15
  : (-11): 170-35: 15,000 075 15
  : 3:05:34 9/13 16-7 U.S. DD 15,000 075 15
  : (-10): 145-7: 4,000 000 15
  : 4:09:28 9/13 15-35:Periscope 4,000 000 15
  : (-10): 145-22: 14,000 000 15
  : 5:03:10 9/20 20-51:Torpedo Ship 37,000 240 14
  : (-9): 123-34: 14,000 000 15
  : 6:20:55 9/20 20-00:U.S. Sub. 8,000 095 14
  : (-9): 121-14: 14,000 000 15
  : 7:22:45 9/26 10-39:Surface 0,350 055 14
  : (-9): 112-37: 14,000 000 15
  : 8:12:16 10/10 21-15:U.S. Jd or DD 11,000 170 12
  : (-9): 121-29: 12,000 000 12
  : 9:06:12 10/13 15-32:Seaman 10,000 032 10
  : (-9): 120-34: 12,000 000 10
  : 10:06:00 10/15 15-35:Armory 12,000 080 10
  : (-9): 120-34: Schooner 8
  : 11:07:22 10/16 15-36:Flashing Vessel 13,000 045 10
  : (-9): 120-52: 12,500 220 10
  : 12:12:23 10/16 16-11:J.A. & 12,500 220 10
  : (-9): 120-52: 12,500 220 10
  : 13:17:04 10/22 13-50:Torpedo Small Coas 22,000 315 10
  : (-9): 119-27: U.S. Vessel 12,000 000 10
  : 14:20:45 10/22 13-26:U.S. Sub. Unknown 12,000 000 10
  : (-9): 119-44: 12,000 000 10
  : 15:01:54 10/23 12-32:U.S. Sub. Unknown 12,000 000 10
  : (-9): 120-41: 12,000 000 10
  : 15:03:56 10/23 12-00:U.S. Sub. Unknown 12,000 000 10
  : (-9): 120-55: 12,000 000 10
  : 16:05:58 10/25 04-01:Flashing Vessel 20,000 5 10
  : (-9): 118-07: U.S. Jd 12,000 320 10
  : 17:20:45 10/24 04-54:J.A. Boat 12,000 320 10
  : (-9): 119-38: 12,000 000 10
  : 18:21:32 10/24 04-40:J.A. Boat 9,000 270 10
  : (-9): 119-43: 12,000 000 10
  : 20:11:25 10/25 03-50:Flashing J.A. Boat 9,000 270 10
  : (-9): 118-07: (Lighter Boat) 12,000 000 10
  : 21:13:08 10/25 03-53:Small 3 Screw 12,000 000 10
  : (-9): 118-60: 12,000 000 10
  : 22:14:20 10/25 03-49:Flashing J.A. Boat 12,000 000 10
  : (-9): 118-40: 12,000 000 10
  : 23:10:34 10/20 02-35:Small Fishing Boat 12,000 180 10
  : (-9): 118-15: Boat 12,000 180 10
  : 24:16:26 10/29 02-30:Flashing J.A. Boat 12,000 180 10
  : (-9): 118-40: 12,000 000 10
  : 25:20:40 10/29 04-17:Flashing J.A. Boat 12,000 180 10
  : (-9): 117-47: 12,000 000 10
  : 26:06:45 10/30 05-05:Small Vessel 12,000 000 10
  : (-9): 117-08: (Fishing) 12,000 000 10
  : 19:

— page 89 —
27:1514 10/30 7-48S Fishing Boat 18,000 5D JU.15
: (-9) 116-15
: 28:2210 10/30 8-35S Patrol Boat 6,200 300 5N 3D
: (-9) 115-41 1 Submarine 9
: 29:1142 10/31 11-50S U.S. Sub. 17,000 010 5D 3D
: (-8) 115-20 1 Submarine
: 30:1328 10/31 12-15S U.S. Sub. 17,000 011 5D 3D
: (-8) 115-13 1 RDFT
: 31:1640 11/1 17-03S U.S. Sub. 10,000 020 5D 3D
: (-8) 114-30 1 JACK
: 32:1013 11/1 18-103S U.S. Sub. 14,000 000 5D 3D
: (-8) 113-47 1 H.D.D
: 33:1935 11/1 18-205S U.S. Sub. 9,000 130 5D 3D
: (-8) 113-15 1

CONFIDENTIAL
20
Enclosure (A)

— page 90 —
9/6
Date: 9/6
S: 1525
U: Time (Zone)
B: Position: Lat.
R: Speed
I: Course
T: Trins
A: Number
R: Type
R: Probable Mission
R: How Contacted
A: Initial Range
F: Elevation Angle
T: Range & Relative Bearing of Plane when it Detected S/N

(State (Sea-)
Sea: (fort)
Direction(rel)
Visibility (tiles)
Clouds:
(Height in
Percent
Crewcast
(Seating(rel)
Room:
Angle
(Percent
Illum.

TYPE: CANOUAGE THIS DATA
321355-3

CONFIDENTIAL
J. elosure (a)

— page 91 —
6 7 8 9 10 11 12
9/12 9/12 9/12 9/12 9/12 9/12 9/12 9/12
0748 0850 1408 1015 1735 0545 0600
(-10) (-10) (-10) (-10) (-10) (-10) (-2) (-9)
17-26 17-21.4 17-01.5 13-57 13-57 15-00 15-00
142-12 142-01 146-05 147-41 147-41 142-57 142-51
14 14 14 15 14 12 12
251 251 251 251 270 270 270
Surface Surface Surface Surface Surface Surface Surface
0 0 0 0 0 0 0
1 1 5 1 1 1 1
Unknown Unknown Unknown US (Unk) US 2327 Lieutenant Lieutenant
Patrol Patrol Patrol Patrol Patrol Patrol
SD Lookout SD Lookout Lookout Lookout Lookout
30 miles 40 miles 15 miles 20 miles 20 miles 30 miles 24 mi
140 140 140 60 60 20 20
ND ND 6 miles 9 miles 8 miles 12 miles 7 miles
095 085 120 090 095
2 2 1 1 1 1 1
130 150 090 None 140 045 045
50 50 35,000 35,000 35,000 40,000 40,000
60,000 60,000 35,000 35,000 35,000 40,000 40,000
20% 20% 35% 10% 10% 10%
None None None None None
CONFIDENTIAL smclosure (a)

22

— page 92 —
13 14 15 16 17 18 19
9/16 9/13 9/19 9/19 9/20 9/20 10/1
1545 1035 1118 1401 1205 1548 2352
(-9) (-9) (-9) (-9) (-9) (-9) (-9)
15-39.4 19-26 29-45 20-46 20-10 20-10 21-43
140-47.2 132-50.6 127-42 127-04.3 122-00 121-52 119-00
12.5 14 14 9 14 3 8
295 298 270 270 250 250 040
Surface Surface Surface Surface Surface Perla Surface

CO 0
1 1 1 1 1 1 1
A Unknown Unknown Unknown Unknown Pete Davis Davis Davis Sub. Hunt Sub. Hunt Sub. Hunt
R Patrol Patrol Patrol Patrol Patrol Patrol
R SD SD SD SD Lookout Peris Lookout
R 20 miles 24 miles 24 miles 13 miles 2 miles 10 miles 4 mi.
20 4 4 4 4 4 4
ND ND ND Unknown 1 mile ND 270
135 270

C O N D I T I O N S
2 2 2 3 2 2 4
160 330 305 305 155 155 070
19 miles 40 miles 40 miles 40 miles Unlimited 20 miles 5 mi.
13009 36,000 50,000 16,000 60,000 6,000 2,000
90% 70% 30% 80% 70% 80% 80%
None None None None None 045
70
15%

CONFIDENTIAL: Amelosure (A)

1 0652
23

— page 93 —
20 21 22 23 24 25 26
: 10/2 10/2 10/6 10/6 10/7 10/9 10/10
: 1338 2005 0804 1626 0844 (-9) 11456
: (-9) (-9) (-9) (-9) (-9) 1052 (-9)
: 21-44, 4 21-46, 3 21-41, 5 21-22 21-16 21-14 21-03, 8
: 119-46 119-56, 5 120-21, 5 120-13 119-31 121-38 121-32
: 2.5 8 2.5 2.5 2.5 2.5 2.5
: 090 090 180 180 090 120 265
: Peris Surface Peris Peris Peris Peris Peris Peris
: 0
: 1 1 1 1 1 1 3
: Betty Unknown Zeke Pete Navis Betty Nells
: Patrol Patrol Patrol Patrol Patrol Patrol
: Peris Lookout Peris Peris Peris Peris Peris
: 10 miles 2 miles 3 miles 4 miles 3 miles 1 mile 6 mi.
: 4° 3° 5° 12° 5° 6° 6°
: ND ND ND 2 miles ND ND
: 3 3 4 3 3 2 1
: 350 350 180 045 045 300 225
: 15 miles 20 miles 8 miles 10 miles 10 miles 20 miles 6,000
: 4,000 2,000 20,000 3,000 3,000 2,000 30%
: 30% 70% 3% 8% 70% 20% 30%
: None None None None None None
: 50
: 15%

Enclosure (A)

CONFIDENTIAL

24

— page 94 —
26b 27. 26b 28. 29. 30. 31
10/10 10/10 10/11 10/11 10/16 10/17
15201 1556 1711 1428 (-9) 1125 1057
(-9) (-9) (-9) (-9) 1742 (-9) (-9) (-9)
21-1906 20-55 20-59.5 18-36 18-38 18-45-5 18-35
121+31.8 121-31 121-30 120-33 120-31 120-49 120-15
14 3 3 3 3 3.3 3.3
100 100 210 250 249 275 100
juris. 2ris. 2ris. 2ris. 2ris. 2ris. 2ris. 2ris.
0
21 1 3 2 1 3 2
A

— page 95 —
32 33 34 35
10/22 10/22 10/22 10/23
1037 1255 1708 1754
(-9) (-9) (-9) (-9)
15-58 14-37 13-50.3 3-30.4
118-28 110-46 119-27.4 120-25
15 19 14 17
Surface 300 140 000 198
00 00 00 00
1 2 1 1
Unknown 2 miles 2 miles 5 miles
Patrol 090 180
Lookout 12 miles 12 miles 10 miles
2' 4' 6' 8'
ND 2 miles 5 miles
090 180
1 1 1 1
030 260 330 180
30 miles Unlimited Unlimited Unlimited
15,000 10,000 8,000
40% 10% 2% 5%
None None None None

CONFIDENTIAL
Enclosure (A)

26

— page 97 —
35-12N - Second War Patrol - report of. [CONT'D]

H - ATTACK DATA

None.

I - NOTES

No remarks.

J - ATTACK DATA

Planes were the principal deterrent to this patrol. ...as we were in ding toward Pelintang Channel from the east a float plane bombed us very accurately; later south of Formosa a big four engine bomber bombed us again; air escorts guarded the only convoy we sighted; and the 150 neogocylo radar equipped planes south of Formosa were a continual menace while we were there. ...aircraft the smaller, more maneuverable planes are more to be feared for their accuracy than the large bombers. ...as there were no rising boats or small craft found south of Formosa it is believed that the Japs have cleared this area of all such craft to permit blind bombing.

The TATSUHI escort encountered on October 10 and later on October 15 was ahead of his convoy patrolling station and pinning. The two landing craft escorts observed on October 10 were likely to be constantly changing their position i.e. the formation.

The two coasters with air escort encountered on October 22 were believed to be in the vicinity of a submarine. The two patrol boats were in the vicinity of a submarine.

— page 99 —
35.3. CO3L - S. And War Patrol - report of. Jont'd)

K - 1.7.0. 1.5.0. (Cont'd)

7. THE VOICE, TELEGRAM, and in the 3rd Radar Range Indicator. - This
transformer; TL(K5-8571); primary: 115v c. 3521L; secondary:
2.55v c 1.75° 1710v c. 007° 6.4v c. 6a

It is urgently recommended that a spare transformer be allowed
on board as its size is small and its loss greatly affects the use
of the vital 3rd radar equipment.

0. THE HOLDING DOWN JET - Now, long-size corner holding down
bolts on the inboard forward corner of 3 engine failed after 1450
hours. The split started at the thread and moved directly across
the bolt.

The holding down bolt at the middle of 4 main engine failed
at the end of the threads after 1600 hours.

9. THE D-ICHTZ.RS - The do-icnizors inserted to remove copper
and nickel ions from the water became deadly close, and after about
3,000 gallons had passed through each, the time for watering better
is was made 4 to 5 times greater than it had been before.

10. THE 3.5.1.

— page 100 —
3.3.3. COSL - Second war Patrol - report of. (Cont'd)

L - RADIO

Radio reception was satisfactory. Of the old ENU frequencies 14390 was the best received during daylight, and 3360 and 9090 were the best received at night. Interference by enemy jamming was noted on all frequencies, doing heaviest during submarine seasounds. 4525 was completely blocked. The jamming was in the form of CI, and consisted of intermittent keying.

Mopaco frequencies were satisfactory, though not so widely used as to carry all the area information.

No messages were received over the China frequencies. Several Jpt stations jammed these effectively with CI keyed continuously.

Of the new NMI submarine schedule frequencies, 9515 was jammed by a powerful Jpt correloral station making regular voice broadcasts. 4515 was completely blocked by CI keyed continuously. 16730 was satisfactory during daylight and 6045 at night.

All the AM frequencies from australia were received well. No jamming was encountered on any of those. Task Force 71 area frequency, 2880, could not be jammed, as no messages were received over it.

While in area during early October a number of NMI messages were missed, including three consecutive COsubmarine serial numbers, due to being forced down or enemy aircraft. On 4 October a 33 signal as sent, asking for a report of NMI station serial numbers 33 to 148. Janus Island received the J3, but the messages were not retransmitted over R-LMU.

One other message was sent from the vicinity of the area, and cleared through Radio Subcomand. Our position during transmission was off Cape Bojador, and short and effective Jpt jamming was encountered. The Jpt adjusted frequency to meet our exactly, and jammed first by sending the letter "MH" in the middle of each group, later by continuous keying. Radio Subcomand nevertheless received the message successfully.

... third message was transmitted direct to VIM from the south-eastern part of the julio sea. The jamming was encountered.

30
COLDSTREAM (L)

— page 105 —
2 - HEALTH, FOOD AND SANITATION

Health of the crew in general was excellent and sanitary conditions at the boat were good.

The following is a list of the illnesses contracted on board during this patrol run.

Appendicitis, chronic. - The patient was treated as follows; absolute bed rest, ice packs to lower right quadrant, morphine T. T. 1.

— page 106 —
35.3. COSTA - Second of Patrol of. (U.S. Naval)

S - SURVEY (Cont'd)
(e) Horo than six years service. 10
(h) Average age of O. fliers. 27
(i) Average age of O. fliers. 33
(j) Average age of O. fliers. 22

School for unqualified men was held daily in the after battery until the last of the patrol time they were sent to various rooms to study. Low previously qualified in other boats were reclassified. These unable to do so to some sent to various rooms to study until they were reclassified and during the interim given the same schooling as unqualified men. All veterans except the torpedo room and the control tower were made a part of a rotation so that each man aboard has set out several different watches.

Horale has been consistently high on the conduct of all hands has maintained the highest traditions of the naval service.

R - TITLES STATED:

| Title | Number |
|-------||
| Injur to Seipen | 2453 miles |
| Injur to Seipen | 19630 miles |
| Injur to Seipen | 29108 miles |
| Injur to Seipen | 42474 miles |
| Injur to Seipen | 52474 miles |

3 - DURATION

| Duration | Number |
|||
| Days enroute to area | 16 |
| Days in area | 30 |
| Days enroute to base | 15 |
| Days enroute to base | 34 |

T - FACTORS OF DURATION

Torpedoes - 24  Fuel - 8357  Provisions - 10  Personnel Factor - 15

— page 107 —
3.3. CODL - Second War Patrol - report of, (Cont'd).

U - RADAR COUNTER-TRIGGER

No Remarks.

V - RIFLES

None.

37

...inclosure (1)

— page 108 —
705-12/416-3
Serial: 0361
COMPARTMENT:
FIRST REPORTER TO:
U.S.S. COBIA - Report of
Second War Patrol.

From: The Commander Submarine Squadron THELVE.
To: The Commander-In-Chief, U.S. Fleet.
Via: (1) The Commander Submarines SEVENTH FLEET.
    (2) The Commander SEVENTH FLEET.

Subject: U.S.S. COBIA (S3245) - Report of Second War Patrol.

1. The second war patrol of COBIA was made in the LUZON STRAITS area enroute MAJURO to FUKUHATSU. Thirty days were spent in the area and thirty-one more on passage.

2. It is regretted that no contacts were made that could be developed into attacks. In spite of lack of action, the state of morale remains high and it is hoped that better opportunities will be found next time.

3. In spite of several major material defects noted on the patrol, the general material condition is well above average. A normal refit will be accomplished together with installation of a 40 MM. gun and the completion of minor approved alterations.

4. The Commander Submarine Squadron THELVE welcomes COBIA to this area after a long though uneventful patrol.

J.B. GRIGGS, F.

1 0682

— page 109 —
14737
: 1/6-3(2)(c)
: 12a/pr
: Serial_01469
: 5 December 1944.
: C-O-N-F-I-D-E-N-T-I-A-L
: SECOND ENDORSEMENT to:
: USS COBIA Conf. Ltr.
: A16-3 Serial 035, dated
: 5 November, 1944. Report
: of Second War Patrol.

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

Subject: U.S.S. COBIA (S3245) - Report of Second War Patrol - Comment on.

1. COBIA's Second War Patrol was conducted in JUZON and SHOOK, commanded by SHOOK's Commanding Officer.

2. COBIA had four contacts that included worthwhile targets, but was not able to close any of them for attack. After leaving the area COBIA was held off TARAAN for three days to provide Lifeguard services. No strikes materialized.

3. Two Japanese army soldiers, survivors of the ARABIA KARU which was torpedoed and sunk by BUGEIGIL on October 16, were picked up October 22 by COBIA enroute FROM THE FLEET.

4. While patrolling on the surface in JUZON STRAIT during daylight COBIA was closely bombed by a plane after diving. The plane was first sighted at 7:00 overcast sky. SD radar indicated that the cloud was in a 70% overcast sky. SD radar indications can be detected by planes equipped with intercept receivers. The protection that it affords, however, under low visibility conditions cannot safely be ignored, particularly in areas where anti-submarine plane activity is known to be heavy.

5. The award of the Submarine Combat Insignia is not authorized for this patrol.

6. The Force Commander welcomes COBIA's Commanding Officer, officers and Crew to this Force. It is hoped that future patrols in SOUSA.C will provide opportunities to again demonstrate the fighting spirit exhibited on prior patrols.

R. W. CHRISTIE.
1 0682
ORIGINAL COPY

— page 110 —
22/1/46-3
UNITED STATES NAVY
12u/pr
Serial_01460
5 December 1944.

C-O-N-F-I-D-E-N-T-I-A-I
SECOND ENDORSEMENT to:
USS COSTA CONTR. LT.
A16-3 Serial 035, dated
5 November, 1944. Report
of Second War Patrol.

Subject: U.S.S. COSTA (SS245) - Report of Second War Patrol - Comment on.

---

**Cominch**
(3) - Direct CTG-71.5 (2)
Vice Opnav (2) - Direct CTG-71.8 (2)
Vice Opnav Op-23c (1) - CTG-71.9 (2)
Com1stFlt1 (1) - ComSubRon-12 (2)
Com2ndFlt1 (1) - DivComSubRon-12 (1)
Com7thFlt1 (2) - DivComSubRon-18 (1)
ComSub1stFlt1 (30) - DivComSubRon-26 (1)
ComSub2ndFlt1 (4) - DivComSubRon-26 (1)
CTF-71 (7) - 3/M School, New London, Conn. (2)
CTG-71.3 (2) - SubAd, Mare Island. (2)
CTG-71.4 (2) - 3/Ms 7thFlt (1)

---

**P. F. STRAUB, Jr.,**
Flag Secretary.

---

**THIS REPORT WILL BE DISTROYED PRIOR TO ENTRY INTO ANY CONTROLLED MATTERS.**

---

**02 TT - S AND 03**

**GENERAL**
- 2-3 S
- WHO IN MISSION

---

**82-32**

**U.S. NAVY**

**CINERAL**

**- 2-3 S**

**WHO IN MISSION**

**82-32**

**U.S. NAVY**

**CINERAL**

**- 2-3 S**

**WHO IN M

— page 112 —
1. The Commander Submarine Division Two Twenty One.
To: The Commander Submarine Squadron Twenty Two.
Via: (1) The Commander Submarine Squadron Twenty Two.
       (2) The Commander Submarine Force, Seventh Fleet.
       (3) The Commander in Chief, U.S. Pacific Fleet.
       (4) The Commander in Chief, U.S. Pacific Fleet.
Subject: U.S.S. COSTA (SS245) - Report of War Patrol
Number THP-35.

Enclosure: (A) Subject Report.
(B) Track Chart.

1. Enclosures (A) and (B) covering the THRIP
War Patrol of this vessel during the period 30 November 1944 to
24 January 1945, are forwarded herewith.

A. L. BECKER.

DECLASSIFIED ART. 0445, OPM/WHST 5510.10C
BY OP-2989C DATE 3/24/42
DECLASSIFIED

— page 113 —
5 November 1944
A - PROLOGUE
5 November 1944
Arrived Freantle from Second War Patrol.
6 November 1944
Commanded rest period, and normal refit by USS GRIFFIN and Division 122 Relief Crew.
20 November 1944
Regular crew returned to ship.
29 November 1944
Completed sound tests, deep dive, practice approaches, battle surface and firing of three exercise torpedoes.
29 November 1944
Ready for sea.

B - NARRATIVE
(All Times How)

20 November 1944
1257
Underway in company with USS ANGLER to conduct convoy exercise north of Rottnest Island.
1426
Cleared swept channel.
1551
Submerged to make practice approach. Upper Conning Tower hatch would not seat tightly so ct
1552
Surfaced. Adjusted hatch.
1632
Submerged. Made practice approach.
1821
Surfaced. Made end around and four surface radar approaches.
250
Secured from convoy exorcise.

1 December 1944
0944
Submerged.
1147
Surfaced.
1534
Submerged.
1547
Surfaced.
1730
Submerged. Conducted Battle Problem.

CONFIDENTIAL

— page 114 —
1 December 1944
1804 Surfaoed.
2250 Exchanged recognition signals by radar with U.S.S.
    S.S.U.G. (3-321). (Ship Contact #1).

2 December 1944
1010 Submerged.
1040 Surfaoed.
1308 Submerged and made practice approach.
1354 Made practice battle surface.
2242 Radar contact on Vlaming Head.

3 December 1944
0141 Sighted Vlaming Head Light.
0340 Entered Mount Gulf staying close to the western
    side where radar ranges on land and bearings on
    Vlaming Head light facilitated navigation.
0645 Moored To U.S.S. Y-10.
0930 Received 15000 gallons of fuel.
1747 Underway from U.S.S. Y-10.
2020 Departed Mount Gulf at full speed.

4 December 1944
0619 Submerged.
0703 Surfaoed.
1420 Submerged and made practice approach.
1536 Made practice battle surface.
2040 Submerged and made practice approach.
2100 Surfaoed.

CONFIRMATION:
-2-

— page 115 —
5 December 1944

0300 Submerged.

0315 Surfaced.

1031 Submerged.

1107 Surfaced.

1357 Submerged and made practice approach.

1507 Made practice battle surface.

1839 Submerged.

1850 Surfaced.

1920 Made radar contact, range 3050, and lost it after 2 minutes. Heeded toward and ran over spot as generated by TD but never regained contact. It was either a sub that submerged, or a phantom pipe.

6 December 1944

0830 Submerged to' approach Lombek undetected.

1847 Surfaced. Used the SD to make landfall by sweeping ahead in hand three times every five minutes, thus minimizing chances of det. action.

2015 Radar contact on land, range 56,000.

2143. Commenced transit of Lombek.

2308 Radar contact on small patrol boat close to Bali shore. (Ship contact #2). He never changed course to head toward us and never closed inside five miles.

2359 Completed transit, no strain.

7 December 1944

0206 Radar contact, range 6,900. (Ship contact #3). Apparently one of the sailboats which are over-present here. Ayeided.

CONFIDENTIAL

— page 116 —
7 December 1944 (Cont'd)

0530 Picked up Sokala Island on the radar' distance, 2,000 yds.

0815 Sighted plane (Aircraft Contact #1). Submerged.

1108 Surfaced.

1339 Sighted sailboat (Ship Contact #4). Avoided.

1450 Sighted sailboat (Ship Contact #5). Avoided.

1740 Sighted sailboat (Ship Contact #6). Avoided.

2105 Radar contact on Great Maalemba Island, range 14 miles.

3 December 1944

0050 Exchanged recognition signals by radar with U.S.S. FLOUNDER. (Ship Contact #7).

0305 Made radar contact on Bawen Island, range 85,000 yds.

1457 Sighted sailboat. (Ship Contact #8).

1520 Sighted sailboat. (Ship Contact #9).

1527 The two boats were converging on us so in order to remain undetected while approaching Karimata, submerged.

1529 Chlorine in both batteries. The amount of chlorine emitted was small but battery water samples taken showed this water to be saline. We had watered batteries this morning. Electrolyte showed chlorine by Silver Nitrate Test.

1559 Not knowing how much chlorine was present decided to accept slight loss in capacity and remove unmixed water from cell tops. Commenced pumping water from cell tops. Blow all water from battery water tanks to ship's tanks.

1900 Surfaced. Headed into sea at one third speed so as to minimize motion and mixing of electrolyte.

9 December 1944

0135 Completed pumping contaminated water from cell tops. Charged battery.

CONFIDENTIAL

— page 117 —
9 December 1944 (Con't)
0615 Submerged. Spont day investigating reasons for chlorination. Recon - Improper procedure and testing by inexperienced personnel. Improper supervision.
1900 Surfaced. Commenced transit of Karimata Strait.

10 December 1944
0313 Made radar contact on Sorotoo Island range 70,000 yds. Received orders to be on station December 11. We can't make it. Decided not to send dispatch in. Krimato for reasons of security.
0446 Completed transmit of #rimato. Proceeding to station at full speed.
1308 Sighted on: iki island bearing 35701, then Datoe Island bearing 0470T.
1500 Took pictures of Tongiki Island at 5 miles distance. No signs of life visible.

11 December 1944
0014 Made radar contact on Soraja Island, distance 28,000 yds.
0300 Made radar contact on soobi 'osari Island, range 32,000 yds. Attempted to send dispatch to CIF 71 but could not raise anyone. Gave it up as a bad job. See Section L.
0338 Radar contact (Ship Contact #10). He was a U.S. Submarine, from his SJ interference, and probably the F-rog but he didn't answer our challenge.
1454 Sighted DAVE, distance 10 miles. (Aircraft Contact #2). Submerged.
1512 Surfaced.

12 December 1944
0310 Entered assigned area, D-6.
1019 Sighted two planes (Aircraft Contact #3). Submerged on station.

CONFIDENTIAL

— page 118 —
12 December 1944 (continued)
1500 Arrived at point assigned us during present operations.
1840 'Enfaced. Patrols closed line between Balabac Island and mainland of Borneo.
2259 Radar contact, range 12,800. (Ship Contact #11). Tracked hi. in to 5,000 yds. and his escort to 4,300. He was on straight course speed 81/2. Identified by sighting against intermittent lightning flashes as a small sea truck with a saiyan escort, both too small for torpedoes. Let him go in hopes that he was blazing, trail for some larger customers.

13 December 1944
0020 Lost radar contact at 14,000 yds.
0557 Submerged.
1843 Surfaced.

14 December 1944
0600 Submerged. Headed north of Balambangan Island for a closer patrol of Balabac Strait.
1847 Surfaced close abreast Caye Kelvilie on Balabac Island.

15 December 1944
0137 Sighted flares or explosions to the south. Headed toward at full speed until definitely ascertained that they were cver land. Probably our planes bombing Borneo.
0236 Received orders to change stations. Headed for new station at full speed.
1216 Sighted plane. (Aircraft Contact #4) Submerged.
1235 Surfaced.
1916 Broke despatched rearracing patrol line when within five miles of new station service. Commenced surface patrol.

CONFIDENTIAL

— page 119 —
17 December 1944
1424    Signed plane. (aircraft contact #5)
    Submerged.
1500    Surfaced.
18 December 1944
0951    Sighted plane. (aircraft Contact #6)
    Submerged.
1047    Surfaced.
19 December 1944
0818    Sighted plane. (aircraft Contact #7)
    Submerged.
1021    Surfaced.
1305    Sighted U.S. Lieutenant. (aircraft Contact #8)
.2027    Received orders to change station.
20 December 1944
0615    Sighted U.S.S. CAVALLA. (Ship Contact #12)
1010    Arrived on new station. Commenced patrolling on
    surface.
22 December 1944
0635    Sighted plane. (aircraft Contact #9)
    Submerged.
0655    Surfaced.
23 December 1944
1610    Received orders to return to Salacia Strait.
Decided to run through dangerous Ground in hopes of
picking up a target enroute.
0142    Pip on the radar, range 10,000 yards. Turned toward
    and ran at full for 20 minutes. Lost pip on turn
    a-1 never regained it.

CONFIDENTIAL

— page 120 —
23 December 1944 (Con't)
0200 Turn a back to base course.
0205 Sighted brilliant aircraft flare about two miles on opposite bearing from radar contact. (Aircraft Contact #10). Submerged. Believe that pip of 0142 was plane who had had an indication of our presence and dropped flare. However, no radar was present on the APR and no subsequent SJ contact substituted it.
0227 Surfaced. All clear on SD. No more flares.
1242 Sighted west York Island, bearing 2140T.
1320 Entered Dangerous Ground.
24 December 1944
0350 Departed Dangerous Ground.
0523 Radar contact on Balabac Island.
0719 Submerged between Balabac and Balambangan Islands.
1839 Surfaced.
25 December 1944
0603 Submerged. (Headed in for close patrol of Balabac Strait, south of Balabac Island).
0735 Sighted plane. (Aircraft Contact #11).
1846 Surfaced.
26 December 1944
0606 Submerged.
1858 Surfaced.
27 December 1944
0601 Submerged. Headed for close patrol of Balabac Strait, south of Balabac Island.
1201 sighted U.S. Liberator. (Aircraft Contact #12).

CONFIDENTIAL

— page 121 —
27 December 1944 (continued)
1834 Surfaced.
28 December 1944
0606 Submerged.
1438 Surfaced in midst of rain squalls and low visibility for radar sweep of area.
1641 Submerged. Visibility opening.
1834 Surfaced.
29 December 1944
0610 Submerged.
1045 Surfaced in reduced visibility and rain squalls.
1230 Sighted U.S. Liberator (Aircraft Contact #13). Attempted to raise him on VHF but could not. He might have been able to tell us where we could find a target but apparently he never saw us.
1247 Submerged. Visibility opening.
1850 Surfaced.
30 December 1944
0604 Sighted what was either an unusually shaped buoy or floating mine. Attempted to sink it with Tommy Gun.
0626 Submerged.
1839 Surfaced. Decided to head south of Balabac Strait to cover North Borneo with radar.
31 December 1944
0022 Ten miles north of Sampamangio Point, Borneo. All clear on radar after a long and thorough search.
0623 Submerged.
1843 Surfaced.
1 January 1945
0618 Submerged.

CONFIDENTIAL

— page 122 —
1 January 1945 (continued)
1617 Hold practice Battle Problem.
1835 Surfaced. Headed down to cover north of Borneo with radar again.

2 Jenua ry 1945
0521 Ten miles north of Sampannangio. No traffic.
0636 Submerged.
1615 Hold practice Battle Problem.
1841 Surfaced.

3 January 1945
0150 Officer of the Dock and lookout sighted what may have been a periscope while we were five miles south of Belabao Island. It was bright moonlight and there was much debris floating around, so the contact was doubtful and never verified by the sound watch. Cleared area at flank speed for twenty minutes.

0600 Submerged.
1845 Surfaced. Decided to head toward area between Balabac Strait and Dangerous Ground to see if a nytning were heading north toward Palawan Passage.

4 January 1945
Conducted surface patrol off entrance to Balabac Strait.
1544 Submerged and held a Battle Problem.
1730 Surfaced.

5 January 1945
0615 Sighted what appeared to be a ship on horizon.
0633 Submerged and made approach on large floating coconut tree.
0720 Surfaced. Conducted surface patrol off Balabac.

6 January 1945
0917 Sighted plane (Aircraft Contact #14). Submerged.

CONFIDENTIAL -10-

— page 123 —
6 January 1945 (continued)
0951 Surfaced.
1442 Submerged and put hydraulic out of commission to repair high pressure air lock in lino to accummulator.
2010 Surfaced. Honed in for patrol across Balbace Strait.
7 January 1945
0101 Made radar contact on Balbace Island.
0604 Submerged for patrol across Balbace Strait.
1837 Surfaced.
2107 Received message to make search of reefs and shoals in Dang erous Ground. Headed away from Balbace at full speed.
8 January 1945
0330 Made radar search of Commodore Roof from 5 miles off roof. All clear.
0457 Made radar search of Inuestigator Shoal from 6 miles off shoal. All clear.
0730 Sighted Cornwallis South Reef and passed it two miles abeam.
0848 Made search of Alison Reef. All clear. Headed toward Rifleman Bank.
1725 Over Rifleman Bank. All clear. Reported results of search.
2142 Received orders to head for Area D-2 to join BESUGO and HARDHEAD.

9 January 1945
1322 Received message from BESUGO to go to search point south of Area D-2. Headed toward at full speed.
1910 Sighted what turned out to be two Japs on a raft. To be sure of their identity, passed them close abroad as they yapped at us in Jap.

CONFIDENTIAL

-11-

— page 124 —
10 January 1945

0344 : At approximate position assigned for search. Made a trim dive.

0412 : Surfaced and patrolled assigned point. During the time between surfacing and daybreak, made our sweeps with the S3 in three minutes intervals so that it wouldn't be detected.

1000 : Headed on course C23 at 10 knots in scouting line with BESUGO and HARDHEAD.

1500 : Changed course south.

1605 : Sighted floating mine and tried to sink it with gun fire. 20 mm hits only dotted it.

1915 : Sighted another floating mine.

2000 : Arrived at patrol point and commenced patrolling in conjunction with BESUGO and HARDHEAD, in courses 113-293, normal to expected course of enemy.

11 January 1945

0845 : Sighted BESUGO patrolling on same line as COBIA.

1200 : Headed toward point off Great Redang Island for patrol closer to coast.

1348 : Sighted plane (Aircraft Contact #15). Submerged.

1419 : Surfaced.

1758 : Sighted another floating mine.

12 January 1945

0555 : Made radar contact on Great Redang Island, range 65,000 yds. Conducted surface patrol off island.

2335 : Exchanged signals with U.S.S. BESUGO then closed to receive information from Wolf Pack Commander.

13 January 1945

0026 : Received letters from U.S.S. BESUGO relativo to communications and to tactics within the pack.

CONFIDENTIAL

— page 125 —
13 Janua ry 1945 (continued)

0713 Submerged. Made close patrol off Great Redang Island.

0955 Sighted a Lily apparently heading on a patrol off Great Redang (Aircraft Contact #16).

1718 Sighted plane (Aircraft Contact #17) probably Lily returning, but too far away to make out definitely.

1911 Surfaced.

2100 Commenced patrolling line.

14 Janua ry 1945

0622 Cyenoed patrol line away from Great Redang in order to be able to conduct a surface patrol.

0735 Sighted plane (Aircraft Contact #18). Submerged.

0755 Surfaced.

1030 Sighted plane (Aircraft Contact #19). Submerged.

1048 Surfaced.

1213 Sighted plane (Aircraft Contact #20). Submerged.

1230 Surfaced.

1255 Sighted mast on horizon about 30,000 yards, bearing 1880T (Ship Contact #13).

1259 Submerged to conduct approach.

1327 Identified target as small escort vessel or AM, zigging radically, with a base course close to our bearing.

1353 Fiord five tubes forward (Torpedo Attack #1).

1354 One hit under his bridge. The first must have hit a magazine or boiler because a huge cloud of smoke arose and he was knocked in half.

1357 Target sank bow first with his screws still turning over in the air. Hurried look showed all clear. Surfaced to see if we could get a picture.

1358 Plane close aboard our starboard bow (Air Craft Contact #21). Submerged.

CONFIDENTIAL

— page 126 —
14 January 1945 (cont'd)

1359 He dropped his bomb as we arrived at 100 feet. The DCI read below, port, aft so that he was either carrying a depth charge or the raiding was a bounce off the bottom. We were in 30 fathoms.

1548 Sighted plane (Aircraft Contact #22). Went to 100 feet for a half hour.

1904 Surfaced.

1956 Headed for Karimata. Not enough fuel for an end around so decided to go home.

Converted #3 and #5 to Main Ballast Tanks.

15 January 1945

0145 Exchanged recognition with U.S.S. BLACKPIN.

0815 Sighted a raft on the horizon. It turned out to be the same one we sighted on the 9th.

0922 Picked up two Jap prisoners and held target practice on their raft.

1450 Sighted the Anambas Islands.

1937 Radar interference on the SJ. Subsequently exchanged signals with U.S.S. SEALION.

16 January 1945

0350 Picked up Tambelan Islands on radar.

1635 Sighted Sercotoe Island and slowed to stay 20 miles away until night.

1913 Started transit of Karimata Strait at full speed.

17 January 1945

0300 Cleared Karimata Strait.

0507 Headed east across the Java Sea.

CONFIDENTIAL

— page 127 —
17 January 1945 (Cont'd)
1555 Sighted Seawear Island bearing 151° T.
2250 Picked up Great Maselambo Island on radar, distance
    22 miles.

18 January 1945
1255 Sighted Lomok Island distance, 54 miles.
1507 Saturated to approach Lomok undetected.
1914 Surfaced and headed through Lomok at flank speed.
2046 Sighted a small patrol boat (Ship Contact # 14) range
    3300 yards. Turned away to avoid, but he sighted us
    with a range of 2900 yards when on our quarter. He
    fired a few small caliber shots, none close, before we
    out-distanced him and cleared the strait.
2120 Passed an unidentified U.S. Sub headed north through
    strait. Exchanged recognition signals but not calls.
    (Ship Contact #15).

19 January 1945
0728 Exchanged recognition signals with HMS TRADEWIND
    (Ship Contact #16).
0940 Exchanged recognition signals with HMS SIRDAR (Ship
    Contact #17).
2054 Exchanged recognition signals with U.S.S. FLOUNDER
    (Ship Contact #18).

21 January 1945
0043 Radar contact on land, range 90,000 yards.
0227 Sighted Vlamig's Head Light, bearing 169° T.
0258 He had into Exmouth Gulf and moored alongside USS Y-10.
1100 Received 15,500 gallons of fuel.
1744 Underway for Fremantle.
1915 Cleared Exmouth Gulf.

CONFIDENTIAL -15-

— page 129 —
3 knots to south in Lombok Strait, December 6.
1 knot to east through Java Sea, December 7-9; also January 17-18.
1.0 to 1.5 knots at 0750 through Balabac Strait, December 12-15 and December 24-27.
.3 to .6 knots to northeast and northwest off Northeast Dangerous Ground, December 16-20.

A Jap raft was seen at 1930, 9 January in Lat. 5058' Long. 1060'7' it was later on (15 Jan. at 0930) seen at Lat. 4°34' Long. 1050'5'. A set of 2260, drift .94 knots.

B-NAVIGATIONAL AIDS
Cape Melville: Light on south end of Balabac Island was used consistently for daytime fixes. No lighted navigational aids were sighted.

While in Dangerous Ground took soundings every fifteen minutes as we passed over a lot of area which showed infrequent or no soundings. This is being forwarded to the Hydrographic Office.

CONFIDENTIAL

— page 132 —
17 18
Time 0940 2054
Date 1/19/45 1/19/45
Lat. 12°02'S. 14°52'S.
Long. 115°12'E. 114°37'E.
Type(s) British Sub U.S. Sub
Initial 15,000 yds. 10,200 yds.
Range
Est. Course 010°T 010°T
Speed 12 Knots 14 Knots
How Con- SD R
tacted
Remarks HMS STIRDAR USS FLOUNDER

No.
Time
Date
Lat.
Long.
Type(s)
Initial
Range
Est. Course
Speed
How Con- .
tacted
Remarks

CONFIDENTIAL (Handwrite here)

— page 133 —
0815 H 06.18, S : Betty : 6 mi. : 270T : SD : None
: 12/7/44:116/27,6 E : : 225 kts. : :
: 1454 H 44.32.05 S : Dave : 10 mi. : 150T : SD : None
: 12/11/44 111.17.4 E : : 120 Kts. : :
: 1019 H 07.22.0 N : Two : 15 mi. : 150T : SD : None
: 12/12/44:116.35.0 E : Sallys : 250 Kts. : :
: 1216 H 09.43.5 N : Emily : 8 m : 061T : SD : None
: 12/15/44:117.28.7 : : 250 Kts. : :
: 1424 : 11/17.0 N : Mavis : 10mi : 167T : SD :None
: 12/17/44:117.49.0 N : : 180Kts. : :
: 6.0951 H 11.17.6 N : Unk. : 8 mi : 240 Kts : SD :None
: 12/18/44:117.51.5N : : 10mi : :
: 0818 : 11.06 N : Betty : 6-7 mi : 060T : SD :None
: 12/19/44 117.55.0 E : : 10mi : :
: 1305 H 11.13.5 N : USS Lib : 20 mi : 045T : SD (High Nome
: 12/19/44:117.54.0 E : E : 180 Kts : periscope : :
: 0635 H 13.55.4 N : Betty ? : 7 mi : 280T : SD :None
: 12/22/44:118.02.2 E : Sally ? : 200Kts : :
: 0205 H 12/50.0 N : Unk : 10mi : 160T : Flare :Flame was
: 12/23/44:116.35.0 E : : 10mi

— page 134 —
15 1348 H 4.25.0 N:Unk. 6 mi. Unk. R None
: 1/11/45 105.03.0F Unk.
: 16 0955 H 5.50.0 N:1ly 10 mi. 317T P None
: 1/13/45 103.10.0F 200 Kts.
: 17 1716 H 5.46.5 N:Unk. 15 Kt. 300T P None
: 1/13/45 103.17.7F 150 Kts.
: 18 0735 H 5.55.0 N:Twin 7 mi. 090T SD None
: 1/14/45 103.12.0F Eng Fat BOMBER
: 19 1030 H 05.52.1N:Betty 10 mi. 195T SD None
: 1/15/45 103.19.0F 200 Kts.
: 20 1213 H 5.56.2 N:Zeke 20 mi. 280T SD None
: 1/14/45 103.15.2F 200 Kts.
: 21 1358 H 05.47.6N:Zero 3 mi. 160T SD Made
: 1/14/45 103.15.2F 210 Kts. quick dive
: 22 1548 H 05.47.6N:Dinah 0 mi. 090T P Hone
: 1/14/45 103.17.4F 210 Kts.

-22-

— page 135 —
U.S.S. COSTA - Third War Patrol - report of. (Cont'd)
H. ATTACK DATA (Torpedo Attack Report Form)
Time 13-52-28H Date January 14, 1945 Lat. 5-51N Long. 103-16E
Target Data - Damage Inflicted
Description Single CM similar to coastal mine layers in ONI 41-42; about 700 tons
Mast sighted bearing 1880T, distance about 30,000 yards in good visibility on surface. Turn count: 210 RPM - 11 knots.
Ships Sunk One coastal mine layer about 700 tons.
Ships Damaged None.
Damage Deter- Saw ship sink with 300 down angle and scows still turning in the air.
Target Draft 6' 1" Course 350 Speed 11 Range 1180 yards.
Own Ship Data
Speed 2 Course 280 Depth 64' Angle 10 down (at firing).
Fire Control and Torpedo Data
Type Attack Sighted mast at 1880T hull down. Submerged and headed toward. First submerged look showed a 300 port angle on the bow, the next a 300 starboard angle. Subsequent looks showed radic-1 zigs but a base course of roughly 350° which would pass close enough for a good shot. Apparently he was either heading north to rendezvous with a convoy or, as the presence of a plane later suggested, he may have been on a sub hunt. A de ro cy all tubes as he is the only shot we have had this run and I don't want to let him get away. With 8 loft gyros and a 1200 run fired the first of five tow tubes. 53 seconds after firing the first fish hit with a loud explosion, so held fire on the sixth torpedo.

CONFIDENTIAL

— page 136 —
1. 2. 3. 4. 5.
: 101. 104. 105. 110. 112.
: 4'. 4'. 4'. 4'. 4'.
: 11th. 11th. 11th. 11th. 11th.
: 188. 188. 188. 188. 188.
: 23. 23. 23. 23. 23.
: 63J62. 50E67. 65476. 65651. 65383.
: 0-5. 0-5. 0-5. 0-5. 0-5.
: 19639. 17704. 26213. 7244. 19908.
: Contact. Contact. Contact. Contact. Contact.
: 10-1. 10-1. 10-1. 10-1. 10-1.
: 14729. 5392. 14.72. 17443. 17076.
: Torpex. Torpex. Torpex. Torpex. Torpex.
: 8 sec. 8 sec. 11 sec. 9 sec.
: 40. 40. 40. 40. 40.
: 40. 40. 40.

— page 137 —
1. BATTERIES - On December 8, while proceeding to station, both batteries were watered with water containing salt. While the battery was on float the water was not in the water. About two hours after completion of the battery, the water was not in the water. The water was not in the water.

— page 138 —
U.S.S. COSTA - Third War Patrol - report of.

K. MAJOR DEFECTS Cont'd.

2. H.P. COMPRESSOR - #1 HP air compressor had to be completely overhauled half-way through the run, due to piston rings freezing and breaking in all stages. Putting it out of commission for two days.

The compressor nozzles were worn out and a complete check for alignment as it had given difficulty since commissioning.

3. ACQUAULATOR - HP air line from Air Flask to accumulator of Hydraulic system developed a lock at the accumulator base. The hole was near the bulkhead making silver soldering a difficult job as the pipe had silver soldered joints and could not be removed to gain access to the trouble.

It is recommended that HP fittings be installed on this pipe to facilitate any repairs to the line.

4. TORPEDOES - Cobra carried a full load of Mk 23 torpedoes of which about 1/3 had leaky or herring chock valves. Some of those leaks were stopped by replacing the latch washer with a nylon one. The rest could not be repaired.

Performance of the five torpedoes fired was good, all ran hot, straight and normal.

5. VAPOR COMPRESSION STILLS - After 180 hours of operation it became necessary to dismantle #2 vapor compression still because the readings on the water produced ran over the maximum on the scale on the Klosinschmidt tester. Three small leaks in the coils were silver soldered and the unit reassembled and rewired after which it operated satisfactorily.

6. AUXILIARY ENGINE - After a total of 1147 hours of operation a valve stem on #3 unit of the Auxiliary Engine snapped about 24" from the valve. The valve was ground up and expelled and no pieces remained. It was necessary to renew the head which was dented, the injector which had a mashed tip, and the remaining three valves which were bent.

— page 139 —
U. S. S. COBIA - Third War Patrol - report of.

L. RADIO

Reception of the BAKER schedule was good throughout patrol. It was noticed that VIXO was weaker during daylight than at night, and had a very slight constant drift at all times. However, no serials were missed.

WOFACO reception and transmission, CW and voice, were very good.

Transmissions on the ship to shore frequencies were cleared only after long periods of call-ups. On 11 December, tried for 14 hours to send a dispatch to CTF 71, without success. 16940 was jammed, 12705 was in use, and VIXO could not be raised on 8470 or 4235. All our later transmissions went through satisfactorily. 12705 plowed by far the best frequency and 16940 the most jammed on all occasions.

There was no satisfactory test of VHF equipment. Transmissions were attempted to friendly subs encountered without reply. They probably were not guarding VHF. Tried to raise a U.S. Liberator off Balabac on 29 December, but he did not answer up.

Chunking's broadcasts were heavily jammed by three Jap stations during the early part of the patrol. About 23 December, reception on 4155 improved greatly. Chunking station serials received were as follows:

329, 330, 331, 332, 338, 341, 342, 344, 345, 346, 349, 355, 356, 357, 368, 369, 376, 387, 388, 391, 392, 395, 396, 397, 399, 400, 419, 420, 421, 423, 424, 425, 427, 429, 430.

CONFIDENTIAL -27-

— page 142 —
U.S.S. COBIA - Third War Patrol - report of.

M. RADAR Cont'd

APR RADAR REPORT Cont'd.

The following is a tabulated summary of APR Contacts:

| Date | Freq. | Pulse Ratio | Pulse Width | Type | Pos. when Contact Made | Remarks |
|------|-------|||------|||
| 12/1/44 | 202MC | 50CPS | 25-30 M Sec. | Unk. | 66 mi. West of Geraldtown, W. Australia. | None. |
| 12/6/44 | 242MC | 142CPS | 25 MSec. | Unk. | Approx. 60 mi. South of Lombok Strait. | Believed to be land-based. |
| 12/6/44 | 280MC | 1000CPS | 5 MSec. | Unk. | Approx. 60 mi. South of Lombok Strait. | Believed to be land-based. |
| 12/6/44 | 196MC | 1000CPS | 5 MSec. | Unk. | Lombok Strait. | Believed land-based. |
| 12/16/44 | 275MC | 1000CPS | 10MSec. | Unk. | Off Mindora St. | None. |

SJ RADAR

GENERAL

The operation of the SJ was normal during the patrol. It was used continuously at night and used during daylight hours when the weather was bad.

TROUBLES

Most of the troubles were of a minor nature and wore romodied with little waste of operational time. The following is a tabulated summary of the troubles, indications of trouble and ramody of the trouble, plus estimated time in operation since leaving Fremantle.

1. Time in Operation

| Time in Operation | 40 hours |
|||
| Troubles            | R44 in PPI Unit Burned out. |

Indications

(1) No Swcops (2) Arcing in center part of R44
(3) Bright spot in center of PPI scope when supply voltage cut off.

Ramody

| Ramody | Re,place R44 in PPI Unit. |
|||
|        |                             |

Remarks

None.

CONFIDENTIAL

— page 143 —
U.S.S. OOBIA - Third War Patrol - report of, (Cont'd)
M - RADAR (Cont'd)
SJ RADAR

2. Time in Operation: 70 hours.
Troubles: Fl in PPI Unit blown.
Indications: (1) No Sweeps (2) Bright spot in center of PPI scope.
Remedy: Replace fuse Fl in PPI Unit.
Remarks: None.
Time in Operation: 90 Hours.
Troubles: V2 (504G) in Regulated Rectifier "A" shorted between plate and cathode.
Indications: Fuses F7 and F8 continued to blow out when power switch of Main Control Unit turned on.
Remedy: Replace V2 (504G) in Regulated Rectifier "A".
Remarks: V be cause gassy before F7 or F8 blew out.

4. Time in Operation: 90 Hours.
Troubles: Gassy High Voltage Rectifier Tube (836) in H. V. Rectifier.
Indications: Fuses F9 and F10 in Main Control Unit continued to blow out when H.V. switch turned on. (2) H.V. Rectifier voltage dipped radically as transmitter loaded circuit.
Remedy: Replace gassy 836 High Voltage Rectifier.
Remarks: None.

5. Time in Operation: 220 Hours.
Troubles: Poor solder connection in plug of IF cable between AFC circuit and IF ja ck in Transmitter Receiver Unit.
Indications: Jumpy grass level on both PPI and "A" Oscilloscopes.
Remedy: Resolder cable plug.
Remarks: Wire which runs through plug was not clipped off so it was easy to loosen solder connection.

CONFIDENTIAL - -31-

— page 144 —
U.S.S. COBIA - Third War Patrol - report of. (Cont'd).
M - RADAR (Cont)
SJ RADAR

6. Time in Operation: 220 Hours.
Troubles: Microphonic Video Tube V6 (6AC7) in PPI Unit.
Indications: PPI scope intensity cut in and out.
Remedy: Replace V6 (6AC7).
Remarks: None.

7. Time in Operation: 240 Hours.
Troubles: Microphonic IF tube in IF strij in Range Indicator Vd (6AG7).
Indications: Jumps grass level on PPI and "A" scopes.
Remedy: Replace V8 (6A07).
Remarks: None.

8. Time in Operation: 370 Hours.
Troubles: Broken Video Cable between Range Unit and PPI Unit.
Indications: No Range Circle.
Remedy: Cable repaired at break.
Remarks: Cable broke at end going into Range Unit. Due to non
9. Time in Operation: 470 Hours.
Troubles: PPI oscilloscope filament broken in oscilloscope V8 (5PP7).
Indications: Jumpy pattern on PPI scope.
Remedy: Replace V8 (5PP7).
Remarks: PPI pattern was normal until SJ was operated for a time and it was adequately warned up.

CONFIDENTIAL

-32-

— page 145 —
10.
Tino in operation 490 hours.

Troubles: C18 in plate of V13 of Bias Generator in Transmitter
    Rooivor Unit shorted out.
Indications: (1) Low H.V. rotifiler current for normal H.V.
    rotifiler voltage. (2) Inductance (L1) in plate of
    V13 got very hot. (3) Plate of V6 (rotifiler part)
    got red due to excessive current through it.
Remedy: Replace C18.

Remarks: None.

---

**OPERATION AND PERFORMANCE SUMMARY:**

The SJ performance was good during this patrol. The following is a summary of typical ranges of chances for the SJ, and also time of operation since leaving Fracantlo.

| Hours in Operation | Initial Range | Max. Range | Echo Identity | Remarks |
||||||
| 70                 | 10,800        | 11,100      | Patrol Craft | Probably PC size thought unconfirmed. |
| 80                 | 53,000        | 53,000      | Land. Ball & Lombok Is. Elov. | None |
| 90                 | 60,000        | 70,000      | Land, Gr. Massa-lambo Is. Elov. | None |
| 110                | 75,000        | 80,000      | Land. Karinata Is. None | None |
| 110                | 45,000        | 45,000      | Elov. 3379 Ft. Land. Seraja Is. | None |
| 130                | 12,800        | 14,000      | Land. Elov. 833 Foot. | None |
| 130                | 6,700         | 7,500       | Small ship PC Size | Sighted from bridge at night, 10,000 yards. |
| 150                | 65,000        | 65,000      | Small ship PT size. | None |
| 210                | 8,700         | 9,500       | Land. Banguey Is. Elov. 1876 Foot. | None |
|                   |               |            | USS CAVALLA SS245 | First sighted by H.P. & radar coach-ed to bear. |

---

**CONFIDENTIAL**

-33-

— page 149 —
3. PERSONS

Unless a regular system of classes is initiated only the more enterprising will attempt to qualify. The freezing of rates of unqualified men, giving qualified men the desirable billets re-sardless of seniority, and giving qualified men a choice of staying in or making the next patrol has done its part towards pushing qualification. Unqualified officers hold class daily with an average of ten men to a class; qualified men demonstrate a piece of machinery to a group of 5 or 4 daily. In this way the unqualified man is given upward of two hours concentrated instruction daily and unqualified officers must go deeply into a system before they can explain it. Men received aboard qualified on other boats to throuch the same routine as unqualified men except that they are not required to fill out a notebook.

The younger men we have received, both in our commissioning allowance and since, have developed surprisingly well. In several cases they have proven more valuable than the more ex-rienced older men. At first, these men, many just out of service schools, were barely fit at all able to hold their rates. With some sea experience to fill the knowledge they were given in schools they have gradually turned out well and numerous of them have been advanced.

The lookout competition each patrol has been a tremendous factor in keeping the lookouts alert. The prestige of the winner is well as his prize gives him an enviable position among the crew of the boat. Conversely, those who constantly miss things in their scoters are chided for their inefficiency by their shipmates.

Nobody on the ship has been transferred to relief crews without being qualified or disqualified. At the end of a run those qualified men who the head of department feel have done the best work are given their choice of a transfer or another run. Though occasionally onvolves transferring a fly of the men it would be desirable to keep, the system acts as a reward for good work and as a stimulus for it.

No. aboard 70 Over 6 yrs. in USN 4
Qualified at start 47 Unqual men on first run 10
Qualified at end 59 Average Officer age 27
Advanced in rating 12 Average Chief age 31
Less than 2 yrs. in USN 30 Average Crew Age 22

COMPENDENTIAL

-37-

— page 150 —
U.S.S. COBIA - Third War Patrol - report of.

R - MILES STRAIGHT

Fremantle to Station 3574 miles 40027 gals.
On Station 5330 miles 47155 gals.
Station to Fremantle 2337 miles 32940 gals.

S - DURATION

Fremantle to Lonbok 7
Days North of Barrier 44
Lonbok to Fremantle 6
Days Submerged 19

T - FACTORS OF ENDURANCE

Torpedoes - 19 Fuel - 13000 Provisions - 10 Personnel Factor 20

U - RADAR COUNTER-MEASURES

No Remarks.

V - REMARKS

The Loran Equipment was used to check the ship's position between 150 South and the South China Sea. In all cases the fixes obtained corresponded with the ship's position and it was a useful check in bad weather. However the stations available had lines so nearly parallel that Loran was not used as the ship's fundamental navigation. With the establishment of stations in the Philippines it is believed that Loran could be used exclusively in this area, though not at the present time.

CONFIDENTIAL

— page 152 —
1945-01-22 14/16
UNITED STATES NAVY
RECEIVED S-C FILES
2 February 1945.

SECOND INDICATOR TO:
USS COBIA Conf. Ltr.
a16-3 Serial 003 dated
24 January, 1945. Report
of Third War Patrol.

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

Subject: U.S.S. COBIA (3a245) - Report of Third War Patrol - Comment on.

1. The Third War Patrol of the COBIA, under the command of Commander A. L. BECKER, U.S.N., was conducted in the area of the SOUTH CHINA SEA.

2. The only attack of the patrol took place on 14 January when a daylight submerged attack was made on a vessel which was identified as similar to a coastal mine layer. Five torpedoes were fired from an excellent position with torpedo run 1200 yards. The sixth torpedo was ready but was withheld when the first hit was heard prior to its being fired. The target was seen to blow up and sink.

3. From 12 December to 8 January COBIA performed reconnaissance duty off BALABAC ISLAND and in the area south of DANGEROUS GROUND.

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

5. The Force Commander congratulates the Commanding Officer, Officers and Crew of the COBIA on this successful patrol during which valuable reconnaissance duty was performed and the following damage was inflicted upon the enemy:

SUN:
1 CM (EU) 700 Tons.

23 FEB 1945
JAMES PIER.
FELCH
NAVY DEPARTMENT
38

— page 153 —
FE24-71/16-3
Serial 0241
C-0-N-F-I-D-E-N-T-I-I-I-L

SECOND EDITOR'S NOTE:
USS COBIL. Conf. Lt.
A16-3 Serial 003 dated
24 January, 1945. Report
of Third War Patrol.

Subject: U.S.S. COBIL (SS245) - Report of Third War Patrol - Comment on.

Distribution:
Cominch (3) Direct CTG-71.5 (2)
Vice Opnav (2) Direct CTG-71.6 (2)
Vice Opnav Op-23c (1) CTG-71.9 (2)
Com1stFlt (1) DivConsSubRon-12 (1 ea)
Com2ndFlt (1) LivConsSubRon-18 (1 ea)
Com7thFlt (2) DivConsSubRon-26 (1 ea)
ComSubs1stFlt (30) S/1 Scho1, N.L. Conn. (2)
ComSubs2ndFlt (4) Comdt. NTL, Zuge1 Sound (1)
CTP-71 (7) Subd., Fare Island (2)
CTG-71.3 (2) S/18 '7thFlt (1)
CTG-71.4 (2)

THIS REPORT WILL BE DESTROYED PRIOR TO ENTRY INTO DAILY DUTCHAMBLE MUSEUM.

J. B. HILLER,
Flag Secretary.

— page 154 —
3 APR 1945
Al6-3(8)(F-3-4/Jk)
Serial: 01157

CONFIDENTIAL

THIRD SUBMARINE UNIT on:
USS COBIA Conv. I, 1st, 3rd
Al6-3 Serial 003 dated
24 January, 1945.

Front: Commander Seventh Fleet.
To: Commander in Chief, United States Fleet.

Subject: T.S.U. COBIA (88245) - Report of Third
War Patrol.

1. Formatted as:
   - [FORMAT: text here]

H. CRUZEN.
1. Direction:
   - [DIRECTION: text here]

4 01240

— page 155 —
1. From: The Commanding Officer:
To: The Commander in Chief, UNITED STATES FLEET.
Via: Official Channels.
Subject: U.S.S. COEIA (SS245) - Report of War Patrol Number FOUR.
Enclosure: (A) Subject Report.
(B) Track Chart.

1. Enclosures (A) and (B) covering the FOURTH War Patrol of this vessel during the period 18 February 1945 to 15 April 1945, are forwarded herewith.

DECLASSIFIED
A. L. BECKER.
BY OP-9999-C DATE 5/25/47

DECLASSIFIED

— page 156 —
25 January 1945
0 February 1945

Completed Third War Patrol.
Normal refit completed by U.S.S.
EURYALE and Relief Crew from Sub
Div 182. Ship docked in ARD-10
February 5 & 6 and port sorew
replaced and struts and stern
tugs rewooded with lignum vitae.
February 8, Lt. (jg) L.H. Davis,
USN was detached and Lt. (jg) P.
D. Rosewrne, USNR and Ensign E.
L. Brown, USNR reported on board
for duty.
Commenced training period.
Lieut.-Comdr. M.G. McCormick, USN
detached.
Grounded in 137 feet of water and
knocked off starboard sound head.
Docked in ARD-10 and damaged
sound head renewed.
Ready for sea.

B - NARRATIVE. (All times HOW through 31 March)

OFFICERS
A.L. BECKER, Comdr., USN.
J.J. SIBLEY, Lt-Cdr., USNR.
J.P. MARION, Jr., Lieut., USN.
J.M. TUYTS, Lieut., USNR.
S.E. HENDERSON, Jr., Lt (jg), USNR.
T.S.C. HENRY, Lt (jg), USNR.
D.C. ZILTON, Lt (jg), USNR.
P.D. ROSEMARIE, Lt (jg), USNR.
E.L. BROWN, Ensign, USNR.

CHIEF PETTY OFFICERS
TURER, F.V., CG, USN.
KORZEMOJSKI, N.F., CQM, USN.
MURRAY, A.C., CEM, USN.
McCAIRTHUR, L., CEM, USN.
RENELLARD, E.D., CMOMM, USN.
BAKER, R.A., CRN, USN.

Enclosure (A).

— page 157 —
18 February
1320 Underway from Fremantle, WA., enroute operating area to conduct convoy exercises in company with USS CAIMAN.

1425 Commenced submerged and surface approaches on escort.

2300 Completed exercises. Proceeding in company with CAIMAN.

19 February Noon Position - Lat. 28-52S Long. 112-41E

0531 SJ radar and sight-contact on unidentified British submarine, range 6,500 yards. (Ship Contact #1)

1330 Conducted submerged runs with CAIMAN.

1825 Submerged.

1840 Surfaced.

2113 Commenced night radar practice.

2240 Completed exercises.

20 February Noon Position - Lat. 24-06S Long. 112-50E

0915 Made trim dive.

0939 Surfaced.

1452 Held emergency drills.

1503 Exercised with CAIMAN making submerged appraches.

1833 Submerged.

1842 Surfaced.

2040 Began night radar approaches.

2210 Completed night practice.

21 February Noon Position - Lat. 19-32S Long. 113-06E

0935 Submerged for trim and sound training using CAIMAN for target.

1059 Surfaced and acted as target for CAIMAN.

1429 Submerged and commenced approach on CAIMAN.

1455 Surfaced, opened out and acted as target for CAIMAN.

— page 158 —
21 February (Cont'd) Noon Position - Lat. 19-328 Long. 113-06E

1700 Sighted HMS TINTILLUS (Ship Contact #2) in high periscope, distance eight miles.

1812 Sighted HMS TRADEWIND (Ship Contact #3) by scope at eight miles.

1836 Submerged.

1844 Surfaced.

2050 Commenced night radar practice.

2116 Submerged, continued approach.

2134 Surfaced.

2305 DESMOND, Forrest E., 606-47-01, MOMAC, V-6, USNR, throttleman in Forward Engine Room, while scouring No. 1 engine from charge inadvertently closed the outboard exhaust valve on No. 2 engine which was running at the time. The engine continued running, lifting the relief valves and filling the room with exhaust gases. After Engine Room crew seeing the smoke, passed word "Fire" and scoured the bulkhead between engine rooms. DESMOND attempted to secure the engine but was overcome by the fumes. Engines were secured from Manayunk, Room, REMILLARD, Earl D., 212-52-91, GMOM(1)(1)(1), USN entered the compartment without smoke mask and secured the ventilation. He too was overcome but was immediately removed by KUTZLEB, Robert E., 224-26-28, MOMAC, USN who had covered his face with a wet rag before entering. KUTZLEB returned to the Control Room and, hearing that DESMOND was unaccounted for grabbed an oxygen reservoir, breathing apparatus and started aft adjusting the apparatus as he went. The engaging hand wheel broke off before the canister was pierced. The apparatus furnished no protection but KUTZLEB, realizing that time was precious continued on using the mask. He crawled the length of the compartment to the throttle station searching for DESMOND. Not finding him, KUTZLEB closed the engine throttle and fought his way back out of the compartment. DESMOND, meanwhile had passed out against the after bulkhead. He was removed into the after Engine Room. Commanding Officer & Pharmacist's Mate had meanwhile gone up and over into the after Torpedo Room and DESMOND was immediately given artificial respiration and put on oxygen. I have gone to some length on this account to emphasize the toxic, blinding, and demoralizing effect of a smoke filled compartment and the necessity for thorough

— page 159 —
21 February (Cont'd)
and frequent instruction in the operation of the
cumbersome Navy Oxygen Rescue Breathing apparatus.
The compartment w's freed from smoke by utilizing
the suction from the after onginos.

2345
Resumed speed and course.
KUZILER was nauseated and weak but reequorated rapidly
in the open air.
DESHOND however was kept on oxygen all night.

22 February
Noon Position - Lat. 17-23S Long. 114-19E.
DISHOND having shown no improvement, reversed course
and proceeded at full speed for Exmouth and medical
assistance.

23 February
Noon Position - Longside USS COUC.I in
Exmouth Gulf.

0402
Made landfall on Vlaming Head.

0750
Tied up to USS COUC.I.

0855
Transferred DESHOND, Forrost E., MoMLic, USNR.
Recieved 15,950 gallons fuel.

1530
Left USS COUC.I and proceeded out of Exmouth to
station.

24 February
Noon Position - Lat. 114-16S Long. 114-18E
0959
Made trim dive.

1024
Surfaced.

1415
Hold emergency drills!

25 February
Noon Position - Lat. 114-54S Long. 115-09E
2215
Made radar contact on Lombok Island at 80,000 yards
and at

2237
Picked up Nusa Bosar Island at 78,000 yards.

2300
Put four engines on propulsion and increased speed
preparatory to transiting Lombok Strait.

2339
Stationed radar tracking party.

— page 160 —
26 February
Noon Position - Lat. 11-54S Long. 115-09E

0127 Encountered SJ interferonoo and at
0157 Made radar contact on USS CHARR at 9,000 yards bearing 023 T. (Ship Contact #4) Received no answer to SJ challenge.

0205 Went to battle stations and altered course to 330 T to pass clear of contact at 023 T.

0210 Picked up HNN ZWADVISCH as a small pip dead astern, at 140 Rcl. distance about 4,000 yards. (Ship Contact #5)

0225 Challenged CHARR by blinker tube. Answered properly.

0237 Changed course to 321 T to pass north of Bali and to go between Goa Goa and Karang Takat reef.

0740 On course 300 T in heavy intermittent rain squalls sighted three small fishing boats (Ship Contact #6) around Karang Takat reef and we passed clear.

0830 Sighted another fishing boat bearing 210 T, 7 miles, passed clear. (Ship Contact #7)

0913 Sighted medium bomber bearing 210 T, 4 miles, and submerged.

1133 Surfaced.

1632 Sighted sea truck in high scope bearing 318 T. (Ship Contact #8).

1638 Went to battle stations, manned dock guns, and put four engines on the line. (Gun attack #1).

1650 Sighted second sea truck in high scope on horizon bearing 243 T. (Ship Contact #9).

1717 Slowed to 2/3 speed and opened fire with 40mm at 2,500 yards.

1723 Opened fire with 4 inch at 2,000 yards.

1731 By this time had fired 10 rounds of 4 inch obtaining 4 hits and the target began to burn.

— page 161 —
26 February (Cont'd)
1737  Fired 12 more rounds of 4 inch and had target under
    effective fire of 20mm and 50 caliber closing range
    steadily.

1747  With 34 rounds of 4 inch and numerous 20mm and 50
    caliber hits target sank suddenly leaving about 20
    survivors in the water. Changed course to close
    second target.

1815  Took second target under fire at 2,500 yards. (Gun
    attack #2) Obtained 4 inch hit with second shot.

1816  Target return 1 fire with two 30 caliber and one
    50 caliber machine guns. 20mm out of commission
    temporarily by hit in magazine. Opened range.

1822  Machine gun fire from target had been wild and in-
    effective but he got one good burst in. This burst
    wounded HUSTON, Ralph Olcik Jr., 755-96-96, SLc, V-6,
    USNR, 20mm loader seriously and BROTCHIE, Thomas
    Henry, 607-32-04, F02c, USNR, supercially, The
    20mm was put out of commission by hit which set
    magazine on fire and the 3rd radar mast was held.
    Opened range and continued slow deliberate 4 inch
    fire.

1847  Target sank. Secured from battle stations and resumed
    course.
    HUSTON appeared to be dying.
    Commenced making patch for 3rd mast.

1930  HUSTON rallied and Pharmacist's Mate decided that there
    was a chance of saving his life if we could get him to
    a hospital.

1944  Roverscrd course and increased speed to flank.

27 February  Noon Position - 4 miles south of Lombok Str.

0005  Passed Karang Takat reef abeam to starboard 5,000 yards.

0025  Sighted Komirian Island ahead. Adjusted course and
    ran for Lombok Strait. 3rd radar operation erratic.

0310  Sighted Bali, 161 T.

0435  Sighted patrol boat (Ship Contact #10) to eastward
    and casod down into middle of Lombok Strait, adjust-
    ing course as necessary to stay there.

— page 162 —
0,5,5. CONN. - Fourth Tarporl, report of. (Narrative Contd.)

27. February (Cont'd)

0534 HUSTON, Ralph Clark Jr., 755-96-96, Slo., V-6, USNR
did of wounds received in sun action.

0510 Shifted small Lor-boat patrol boat (Ship Contact #11).

0540 Tender repairs to SS 1st completed, subrogated.
went to 125 foot and continued transit of Lor-boat
sub organized at 2/3 speed. Radar mast located badly.
at various times during transit heard pinings on 17
Kos and numerous sea noises - none close.

0912 Cleaned strati and continued at sea speed to open
out. . . four 1mot current behind us enabled us to
make good of 1ht knots.

1405 Surfaced and opened out at three engine speed,
charing on the fourth.

1600 Slowed to 1/3 speed in position: Lat. 06-023 Long.
114-000 corr.ordinates of HUSKY, Ralph Clark Jr.,
Sle., USS to deep. Continued on at 3 engine speed.

26 February
Noon Position - Lat. 14-415 Long. 114-452
Continuing on course returning to Freantle to repair
SF radar mast and leashing motor holed by 'unfire and
flooded on divv in LorboL.

1 March
Noon Position - Lat. 19-265 Long. 113-242
Continuing to Freantle.

2 March
Noon Position - Lat. 23-358 Long. 112-452
Continuing to Freantle.

3 March
Noon Position - Lat. 28-045 Long. 112-372
Continuing to Freantle.

4 March
Noon Position - Outboard USS JURY.13.

0724 Made landfall on Nottinost Island.

0941 Moorad starboard side to USJURY.11.

5 to 7 March

Undercoin; repairs at Freantle.

— page 163 —
8 March
1310
Undorway from EURYL to rosumo patrol. Conducted practice submord and night radar approaches.

9 March
Noon Position - Lat. 28-37 S Long. 112-54E
Undorway to area conducting practice drills and divos.

10 March
Noon Position - Lat. 23-398 Long. 112-32E
Undorway to area.

11 March
0015
Made landfall on Vlaming Head and continued on into Emouth Gulf until

0649
Mocrod alongside USG COUCL from whom we recoivod 14,000 gallons of fuel oil.

1832
Got underway and at

2014
Cleared Emouth Gulf for Lombok Strait.

12 March
Noon Position - Lat. 17-17S Long. 114-05E
Made trim dive and at

1651
Held fire drill.

13 March
Noon Position - Lat. 11-11S Long. 115-33E
Continuing toward Lombok Strait.

1640
Sighted Bali and at

2030
Wont to Flank spced and commnocd transit of Lombok.

2143
Pickd up small boat on SJ (Ship Contact #12) at 9,050 yards near Bali. Ho was on course 250 T and never showed any interest in us.

2211
Pickd up another boat (Ship Contact #13) at 5,500 yards in the contor of the channel near the northern and altered course to the westward and easily ran around him. Beliovo that he was a fisherman.

2300
Oloarod Lombok and set course for Goa Goa.

2350
Pip on tho SJ at 5,200 yards. This doveloped into a small woodon ship (Ship Contact #14) and we lot him alone so as not to discloso our route.

- 8 -

— page 164 —
14 March
Noon Position - Lat. 05-37S Long. 114-08E

0343 Passed Goa Goa aboard to port 14,000 yards and continued at flank speed.

0900 Sighted Jake and div'd.

0950 Sighted mast 167 T (Ship Contact #15) and at

1002 Went to battle stations and commenced approach.

1013 Identified target as U.S. Submarine.

1017 Surfaced and exchanged signals with USN BRIM.

1140 BRIM submerged.

1200 Sighted plane and div'd.

1303 Sighted smoke on horizon bearing 192 T. (Ship Contact #16).

1315 Went to battle stations and commenced approach. Hoard pinging in direction of original contact and sighted a tactical air fire ships in convoy. Plane still hovering around.

1433 Observed hit by BRIM which completely demolished small Maru. Convoy scattered, with two escorts and plane going over to work on BRIM. Hoard depth charges on his bearing. Two small Marus continued on. Attacked closer of the two, a small Maru of about 400 tons with NITTER MARU painted on his bow.

1433 Fired four fish forward set at four feet. (Torpedo hit - 1). Two tracks wore observed to run under. Lots of excitement on target. Non pointing to personnel and to fish as they passed under. One man ran forward and manned a sort of to'sn's chair under bow. Target turned toward.

1435 Went deep (150 feet) and reversed course. No depth charges. Hoard escorts closing from direction of BRIM.

1512 It periscope depth. Sighted Jake and Davo searching area over two escorts - one minesweep and one auxiliary Sub Chaser. Went back to 100 feet and cleared area.

1638 Surfaced and set course to pass north of Bawcon Island.

— page 165 —
15 March
Noon Position - Lat. 04-268 Long. 110-412
Passed Bucean Island about to port, 18 miles.
Changed course to 015 to get on track of reported convoy.
Sighted ship (Ship Contact #17) and turned away. Ship closed rapidly so at
Submerged and commenced approach. Closest range 5,000 yards. Identified as PC.
Surfaced and commenced tracking him on course 325 T. Hoping he would load us to suitable target.
Target reversed course to 080 and we followed suit and continued tracking him from ahead in his starboard bow. Crossed ahead of him and put ourselves between land and his track. Closed Cape Pocking. No sign of convoy.
He passed us about to port on course 080 T, speed 14. Considered him too small a target for torpedoes and too well armed for a gun attack.
Got course to leave vicinity and continue to area.
16 March
Noon Position - Lat. 01-278 Long. 107-523
Inroute to area.
Dived at daybreak to transit Karimata.
Surfaced to air boat.
Dove.
Surfaced after unventful passage of strait.
Passed Sorcotto Island about to starboard, 9 miles.
17 March
Noon Position - Lat. 05-54N Long. 107-178
Inroute to area.
Passed Pongiki Island about to starboard.
Sighted must on horizon (Ship Contact #18) and at
Sighted two more. On close inspection proved to be wooden sampans of very small size. Closed, no Japs aboard so took pictures and departed.

- 10 -

— page 166 —
17 March (Cont'd)
1055 Passed Tambolcan Island abeam to port, 20 miles.
1105 Sighted another sailboat, 307 T, distance 10 miles.
1917 Converted #4 F.B.T.
18 March Noon Position - Lat. 05-46N Long. 107-20E
0632 Submerged on course 000 T.
0645 Lots of smoke from QB power stack. (See Sound, section N.)
0934 Surfaced.
1600 QB back in partial commission.
19 March Noon Position - Lat. 09-15.6N Long. 106-59.3E
0624 Submerged.
0904 Surfaced.
1048 Dove on SD contact closing from 9 miles.
1105 Went deep to check layers.
1226 Surfaced and continued at standard speed.
1516 Dove on plane contact sighted by periscope at 11 miles.
1555 Surfaced.
2100 Entered area. Contacted BLENNY and BAY, and obtained their positions.
20 March Noo. Position - Lat. 11-01.5N Long. 108-53.4E
0642 Dove for submerged patrol on probable convoy track.
0255 Sighted Capo Padrean, distance 25 miles.
0914 Sighted two small fishing boats. Those who fire first of numerous similar contacts. At almost all times small sailing craft wore in sight in this area and from this point on in this narrative they will be mentioned only when their actions influenced us directly.
1627 Heard distant underwater explosions.
1629 Sighted large column of smoke bearing OIL T which is whore PLENNY is patrolling.

— page 167 —
20 March (Cont'd)
1646 - Moro underwater explosions at irregular intervals.
1708
1712 Surfaced on course 090 T. Commenced opening coast to end around. Started end around to north. Interf. for once on 1-PR at 155 Kcs strong.
1904 Forced down by plane contact closing on SD.
2000 Surfaced and stood out from coast to contact BLENNY.
2343 Incountered SJ interference, and at
2355 Exchanged calls with BLENNY (Ship Contact #19).
21 March Noon Position - Lat. 10-56.3N Long. 109-32.3E
0047 BLENNY came alongside for voice conference. BLENNY and BLY directed to patrol inshore for next three days. COHL to lio out during daylight and close beach at dark until BLENNY and BLY got charge in.
0107 Last BLENNY and continued patrolling. BLY reported sinking escort vessel.
0205 Fly on the SJ at 15,500 yards which lasted for three minutes and was thought to be a plane.
0956 Dovc. Plane contact on SD closing to 6 miles.
1023 Surfaced and continued patrolling.
1725 Sighted an object in the high scope boraing 300 T at about 20,000 yarcs, (Ship Contact #20). Turned toward.
1729 Dovc and commenced approach. He was close inshore and on a southerly course. He appeared to be a submarine of the I-121 class although this identification is doubtful.
1920 Surfaced to see what we could do on the surface.
1925 Forced down by plane close aboard seen by lookout.
2003 Surfaced and stood up coast to see what might be thoro.
2040 Picked up interforano on SJ boraing 070 T.
2125 Exchanged recognition with BLENNY (Ship Contact #21) and told her about Nip sub.

— page 168 —
22 March
Noor Position - Lat. 11-02.5N Long. 109-57.23
1050
Plan contact on SD closing. Submerged. Belicov
those planes wore Navy search planes but could not
establish communications. No IFF.

1117
Surfaced.

1316
Liberator broke out of overcast almost overhead. Dov.
The SD was discovered to have a broken contact shoe.
Remained submerged to repair.

1500
Surfaced and continued in towed land for close look
at night.

23 March
Noor Position - Lat. 11-24.1N Long. 110-12.53
Continued searching coast and at
0053
Changed course to head out from coast.

1203
Reversed course and headed in towed coast.

2130
Met BLINNY again. (Ship Contact #22)

2140
Started out from coast to patrol off the coast.

24 March
Noor Position - Lat. 11-18N Long. 109-43.72
Standing out from coast.

0900
Changed course to 000 T to maintain a north & south
coverage about 40 miles offshore.

2317
Rendezvoused with GU.VII. (ship Contact #23) to
discuss tactics for this next day.

2330
Hoaded in for Cape Padaran to be in position for close
in patrol the next day.

25 March
Noor Position - Lat. 11-31.7N Long. 109-10.75
0602
Dived off Hon Do and conducted submerged patrol.

1530
Sighted Liberator patrolling area.

2010
Surfaced and opened coast to 10 miles and then
parrelled it on a northerly course.

26 March
Noor Position - Lat. 11-18N Long. 108-59.82
0615
Dived off Cape Padaran for a submerged patrol.

— page 169 —
26 March (cont'd)
2016
Surfaced on a southerly course and continued that until
2217
Received message giving life guard station for strike 'about 26th'. Assumed this was for strike on convoy due next morning so procoeded to station. Expected but did not receive amplifying message.
27 March
Noon Position - Lat. 11-46.3N Long. 109-24
Patrolling out from coast.
1048
Made contact with a P-24 who told us of a convoy running northward into Carranah Bay. Sent on all engines and headed up to intercept.
1240
Forced to dive by an SD contact which closed from 11 to 4 miles which gave no LTF or VHF answer. Ho drew ed two depths charges not close.
1301
Sighted mast of escort type vessel and turned to close him. (Ship Contact #24.)
1320
Sighted a second similar ship. (Ship Contact #25.)
1335
Sent to battle stations and commenced approach. Both vessels were headed out from plottod position of convoy coming; the area apparently searching for us on information from the plane. Plunging was heard on 17 Kcs. Heard first of about 20 depth charges apparently from those escorts.
1400
Rigged for silent running because of excellent sound conditions and shallow water and continued approach.
1410
Sighted plane acting in conjunction with the escorts hovering directly over them. Plane banked and headed for periscope. Considered chances of hitting alerted escort with plancovor to be bad so went to 150 foot and opened out.
1747
Surfaced. Decided to patrol off Carranah Bay on chance convoy had gone in thore.
1940
Rechanged calls with GU.VIIL. on radar (Ship Contact #26.) His attack had been frustrated by alert escorts. Ho reported convoy clear of area to north.
Reported position to Com'olf Pack in ROCK. Received instructions to patrol present station.

— page 170 —
28 March Noon Position - Lat. 11-24N Long. 109-32Z
0144 SD contact at 7 miles closing. Submerged when it reached 4 miles.
0127 Surfacod.
0228 Intercepted message from BLACKFIN starting in to patrol north Carranh on 28th.
0250 Exchanged recognition signals with USS ROCK (Ship Contact #27).
0400 Constant strong APR indication at 155 Mts. Commenced maneuvering to get bearing and determine whether sub, air, or land based. As the signal varied in strength could not results with our non directional outfit.
0545 With AP signal at maximum strength and beginning to get light subnorcored. Had intended to patrol off Carranh Bay today but our preoccupation with the radar plus a three knot ourrround allowed us to drift south. Patrollord off Fannang Bay.
1728 Surfacod.
29 March Noon Position - Lat. 11-57N Long. 109-25.53
0626 Subnorcored to patrol close off Mui Davaih.
1152 Hoarx distant underwater explosion.
1154 Hoarx distant underwater explosion.
1200 Hoarx distant underwater explosion.
1635 Sighted floating contact mine.
2000 Surracod and oponod out from coast.
30 March Noon Position - Lat. 11-46N Long. 109-20.62
0055 Contact on SJ radar at 11,000 yards (Ship Contact #28).
0107 Stationed tracking party and commenced tracking. Deterined target to be standing down the coast from Carranh Bay about 15 miles offshore. Target gave good sharp pip indicating a metal hull.

— page 171 —
30 March (cont'd)
In position ahead of target and target in sight as vague blur, went to radar depth. Small silhouette plus good echo led to believe target was submarine. Had to get in close to identify.

At periscope depth made out sail on target. With target tracking properly and sound reporting "sound disturbance either screws or beach noise" on bearing of target decided to fire one fish sal at 3 foot on chance target might be sub with sail it wasn't. Had wasted one fish.

Scoured from battle stations and surfaced. Opened out from coast to five miles, and headed up coast for Carran Bay.

Sighted object bearing 350 T (Ship Contact #29) and at

Move to radar depth and went to battle stations.

Picked up target in scope and went to 60 feet.

Identified target as another sailboat.

Scoured from battle stations and continued watch off Carran Bay.

Sighted ship bearing 069 T (Ship Contact #30) on the horizon. Pulled standard until

Has able to identify ship as hospital ship, properly marked, and secured approach.

Surfaced and ran out from coast.

Reached calls with BLACKFIN on SJ.

Noon Position - Let. 11-56.9N Long. 109-16.8E

Dove for patrol off Carran Bay.

Surfaced and opened out from coast.

Received orders to rendezvous with ROCK.

Exchanged calls with ROCK and closed to confer.

— page 172 —
1. April
Noon Position - Lat. 10-45.8N Long. 109-46E
Patrolling on surface south of latitude 11 as per ROCK's instructions.

1527 Plane contact on SD at 11 miles and no IFF return and no answer by voice call.

1529 Submerged - plane at 3 miles but not visible in overcast.

1550 Surfaced and tried again to raise plane on radio - no luck.

2319 Reversed course.

2 April Noon Position - Lat. 10-45.1N Long. 109-44.3E
Patrolling away from coast on a 090 - 270 course.

1255 Hard friendly plane on WH but could not get hit on SD.

1402 Another plane contact on SD at 11 miles. Received proper IFF reply. Could not establish communications.

1520 Submerged when second SD pip closed steadily without answering the IFF. Told not answer radio or WH.

1638 Surfaced and continued offshore patrol.

3 April Noon Position - Lat. 11-01.3N Long. 109-35.1E
Continued offshore patrol.

0809 Sighted porisco bearing 270T range 2,000 yards. (Ship Contact #31.) Changed course away. Ran to the eastward to lose hit. and then rowed northward.

0925 Dove for approaching unidentified plane.

0936 Surfaced and continued northward.

1355 Another scope sighted at 5,000 yards about eight foot out. (Ship Contact #32). Cloaked vicinity and decided to open out to eastward.

1748 Turned to close coast and got a fix from land.

— page 173 —
3 April (cont'd)
2400  Roversod course and headed out.
4 April  Noon Position - Lat. 10-55N Long. 109-20.6E
Petrolling on an east - west line off shore.
1516  Hard search plane on VHF with IFF return at 29
miles but ho didn't answer us.
5 April  Noon Position - Lat. 11-05.8N Long. 108-57E
Closed coast during early morning and at
0718  Sub-crgo south of Cape Padaran, and headed around
coast about three miles off.
1828  Roversod course and headed back.
2041  Surfaced and hondod out to open coast to about 10
miles.
6 April  Noon Position - Lat. 11-19.6N Long. 109-03.5E
0312  Had a pip on the 3d at 5,000 yards and although
it was lost probably one of the numerous small
sailing craft decided to track it for the practice.
0424  Scoured tracking sailboat.
0731  Dived off Phanran Bay.
2050  Surfaced and headed away from coast.
7 April  Noon Position - Lat. 11-25.1N Long. 109-06E
0343  Headed back toward coast.
0700  Dived off Hon Do and changed course to the north
to follow coast.
1415  Roversod course.
2036  Surfaced and opened coast to rendezvous with ROCK
for mail.
8 April  Noon Position - Lat. 11-26.6N Long. 109-13.7E
0600  Had rendezvous with ROCK and received one bag of
mail via rubber boat. Morale showed decided lift.

— page 175 —
8 April (cont'd)
1834: Submerged after satisfying ourselves that there were no more survivors in the water.
2029: Surface and ran northward parallel to the coast to be up off Carranh Bay for a submerged patrol in the morning.
9 April: Moon Position - Lat. 11-54.7; Long. 109-22.42
0702: Submerged off Carranh Bay.
1425: Picked up what looked like a square rigged sailing ship at about 11,000 yards (Ship Contact #33) and with an angle on the bow of about 90 port. Pulled standard and tried to close him until
1622: At this time he had pulled well ahead of us and disappeared due to poor visibility. It was considered imprudent to surface and overtake him because of his size and our proximity to the Jap observation posts at Tague Island.
2027: Surface and started out from coast to run down to Hon Do about 10 miles offshore.
10 April: Moon Position - Lat. 11-38.3N; Long. 109-16.35
0157: Picked up radar pip on 260 T, at 10,500 yards. Went in to investigate.
0220: Went to battle stations after tracking him and decided to close to investigate. The strength of the pip indicated that he might be near the outlying submarine. No warning for him.
0259: Deterrined him to be a sail boat and we turned to leave. He found numerous other small pips on the FPI scroun - all small sail boats so we manoeuvred to stay clear and continued down to Hon Do.
0705: Submerged off Hon Do and ran a submerged patrol.
1334: Sighted a B-24 in towarI the beach. Came up to stick out VFR antenna but were unable to communicate.
2031: Surface and headed up the coast for the northern part of the area.

— page 176 —
11 April 1944 - Fourth Patrol, report of. (Narrative contd)

11 April 1944
Noon Position - Lat. 11-42 Long. 109-15
Laying to adjusting pit-log.
Finished work on pit-log and headed in toward Caiman.
Dove and continued on toward coast.
Sighted E-24 over land.
Surfaced and headed back up for northern limit of area.

12 April 1944
Noon Position - Lat. 11-48N Long. 109-21E
Reached reconnaissance with BLUGGILL (Ship Contact #34).
Dove north of Caiman to run down to bay.
Turned to move out from coast.
Surfaced and headed for northeast corner of area.
Received message to head for Subic Bay.

13 April 1944
Noon Position - Lat. 13-11N Long. 112-09.15
Departed area.
Dove to lose time and keep on schedule.
Surfaced and continued on to Subic.

14 April 1944
Noon Position - Lat. 14-46.5N Long. 115-03.8E
Enroute to Subic Bay.

15 April 1944
Noon Position - Subic Bay.

Arrived Subic Bay.

— page 178 —
1.0531 2/19: 30-045 British C/M 6,500 150 R: None
: 2.1700 2/21: 19-515 HUS TARPUILS 16,000 175 HP: Xch. calls.
: 3.1318 2/21: 18-368 TRUDDIND 10,000 175 HP: Xch. calls.
: 4.0157 2/26: 08-309 USS OILER 9,000 320 R: Xch. calls.
: 5.0205 2/26: 08-300 HTR ZUMDIVIS 7,000 140 R: Xch. calls.
: 6.0740 2/26: 06-565 3 S/AI netivo: 8,000 1stop LT: XC.
: 7.0820 2/26: 07-000 Nativ. boats 14,000 210 HP: XC.
: 8.1630 2/26: 06-075 XSOT TRUCK 14,000 050 LT: XC. Sunk.
: 9.1650 2/26: 06-075 XSOT TRUCK 12,000 050 HP: XC. Sunk.
: 10.0435 2/27: 08-079 Patrol boat 6,000 330 S/N XC. Lc. Xch.
: 11.1540 2/27: 08-323 Patrol boat 12,000 040 LT: Xch. Xch. patrol.
: 12.2143 3/13: 08-355 Patrol 9,050 240 R: USUAL Lc. Xch.
: 13.2211 3/13: 08-275 Patrol 5,500 080 R: USUAL Lc. Xch.
: 14.2350 3/13: 08-305 S: SAI unknown 5,200 120 R: Turned away.
: 15.0950 3/14: 05-508 USS BRUM 10,000 340 P: Surface Xch.
: 16.1303 3/14: 05-395 400 Ton Xch. con 15,000 035 P: Torpedo attack.
: 17.1414 3/15: 04-079 Xch. 280 LT: Tracked Xch. Xch.
: 18.0905 3/17: 00-420 SAI Linc Junks 16,000 090 HP: Closed and
: 19.2350 3/20: 11-280 USS BERRY 4,000 280 R: Xch. signals.
: 20.1725 3/21: 11-000 Yap subcar 20,000 180 HP: Dovo & co.
: 21.2125 3/21: 11-10N USS BERRY 4,800 240 R: Xch. signals.
: 22.2130 3/23: 11-19N USS BERRY 10,050 200 R: Xch. signals.
: 23.2317 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 24.0942 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 25.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 26.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 27.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 28.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 29.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 30.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 31.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 32.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 33.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 34.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 35.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 36.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 37.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 38.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 39.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 40.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 41.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 42.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 43.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 44.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 45.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 46.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 47.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 48.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 49.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 50.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 51.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 52.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 53.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 54.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 55.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 56.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 57.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 58.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 59.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 60.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 61.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 62.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 63.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 64.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 65.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 66.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 67.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 68.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 69.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 70.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 71.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 72.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 73.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 74.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 75.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 76.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 77.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 78.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 79.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 80.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 81.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 82.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 83.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 84.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 85.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 86.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 87.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 88.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 89.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 90.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 91.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 92.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 93.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 94.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 95.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 96.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 97.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 98.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 99.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 100.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 101.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 102.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 103.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 104.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 105.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 106.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 107.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 108.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 109.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 110.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 111.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 112.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 113.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 114.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 115.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 116.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 117.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 118.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 119.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 120.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 121.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 122.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 123.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 124.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 125.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 126.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 127.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 128.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 129.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 130.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 131.000 3/23: 11-26N USS GULVIN 10,000 290 R: Closed for
: 132

— page 179 —
U.S.S. COELA - Fourth War Patrol - report of. (F. cont'd)
:  F - SEIP CONTACTS
:  H C
: 00
:  No:Time :Date:  LX  :  Type  :  R  :  CS : 17 N:  Remarks
:  24:1301 :3/27:11-35N:  Hashidate class  :  Var :  P :Closed for
:

— page 181 —
5. COST: - Fourth Tar Patrol, report of. (Cont'd)

H - ATTACK DATE:
U.S.S. COST: Torpedo Attack No. 1 Patrol No. FOUR
Time: 14:33 14 March 1945 Lt.05-40S Long.114.14.25

TARGET DATE: - D.M.G. INFLICTED

DESCRIPTION:
400 Ton taru with name NITTUR HATU painted on bow in convoy consisting of three small tarus in loose line of bearing with two escorts and air cover.

SHIP RUN:
Nono.

Target Draught - 4' Course 060 Speed 5 Range 1,515
Own Ship Speed 4.5 Course 140 Depth 64 Length 0

TEXT ATTACK:
First sighted plane and dive smoke sighted at 1303 bearing 192 T. BRACK got hit which disconcerted taru on port side of convoy. This escorts went to work on him. Onboard remaining two narus and finally at-tained firing position on 1.iddle taru 1500 yard run, 95 port track set depth 4 foot and fired. Fish ran under.

FIRE CONTROL AND TORPEDO DATE:

| Date | Time | Location | Type of Torpedo | Number of Torpedoes | Type of Torpedo | Number of Torpedoes |
|------|------||||||
| 1    | 094  | 096      | 63967            | 6-5                 | 6-5             | 6-5              |
| 2    | 098  | 098      | 63967            | 6-5                 | 6-5             | 6-5              |
| 3    | 099  | 099      | 63967            | 6-5                 | 6-5             | 6-5              |
| 4    | 100  | 100      | 63967            | 6-5                 | 6-5             | 6-5              |
| 5    | 101  | 101      | 63967            | 6-5                 | 6-5             | 6-5              |
| 6    | 102  | 102      | 63967            | 6-5                 | 6-5             | 6-5              |
| 7    | 103  | 103      | 63967            | 6-5                 | 6-5             | 6-5              |
| 8    | 104  | 104      | 63967            | 6-5                 | 6-5             | 6-5              |
| 9    | 105  | 105      | 63967            | 6-5                 | 6-5             | 6-5              |
| 10   | 106  | 106      | 63967            | 6-5                 | 6-5             | 6-5              |
| 11   | 107  | 107      | 63967            | 6-5                 | 6-5             | 6-5              |
| 12   | 108  | 108      | 63967            | 6-5                 | 6-5             | 6-5              |
| 13   | 109  | 109      | 63967            | 6-5                 | 6-5             | 6-5              |
| 14   | 110  | 110      | 63967            | 6-5                 | 6-5             | 6-5              |
| 15   | 111  | 111      | 63967            | 6-5                 | 6-5             | 6-5              |
| 16   | 112  | 112      | 63967            | 6-5                 | 6-5             | 6-5              |
| 17   | 113  | 113      | 63967            | 6-5                 | 6-5             | 6-5              |
| 18   | 114  | 114      | 63967            | 6-5                 | 6-5             | 6-5              |
| 19   | 115  | 115      | 63967            | 6-5                 | 6-5             | 6-5              |
| 20   | 116  | 116      | 63967            | 6-5                 | 6-5             | 6-5              |
| 21   | 117  | 117      | 63967            | 6-5                 | 6-5             | 6-5              |
| 22   | 118  | 118      | 63967            | 6-5                 | 6-5             | 6-5              |
| 23   | 119  | 119      | 63967            | 6-5                 | 6-5             | 6-5              |
| 24   | 120  | 120      | 63967            | 6-5                 | 6-5             | 6-5              |
| 25   | 121  | 121      | 63967            | 6-5                 | 6-5             | 6-5              |
| 26   | 122  | 122      | 63967            | 6-5                 | 6-5             | 6-5              |
| 27   | 123  | 123      | 63967            | 6-5                 | 6-5             | 6-5              |
| 28   | 124  | 124      | 63967            | 6-5                 | 6-5             | 6-5              |
| 29   | 125  | 125      | 63967            | 6-5                 | 6-5             | 6-5              |
| 30   | 126  | 126      | 63967            | 6-5                 | 6-5             | 6-5              |
| 31   | 127  | 127      | 63967            | 6-5                 | 6-5             | 6-5              |
| 32   | 128  | 128      | 63967            | 6-5                 | 6-5             | 6-5              |
| 33   | 129  | 129      | 63967            | 6-5                 | 6-5             | 6-5              |
| 34   | 130  | 130      | 63967            | 6-5                 | 6-5             | 6-5              |
| 35   | 131  | 131      | 63967            | 6-5                 | 6-5             | 6-5              |
| 36   | 132  | 132      | 63967            | 6-5                 | 6-5             | 6-5              |
| 37   | 133  | 133      | 63967            | 6-5                 | 6-5             | 6-5              |
| 38   | 134  | 134      | 63967            | 6-5                 | 6-5             | 6-5              |
| 39   | 135  | 135      | 63967            | 6-5                 | 6-5             | 6-5              |
| 40   | 136  | 136      | 63967            | 6-5                 | 6-5             | 6-5              |
| 41   | 137  | 137      | 63967            | 6-5                 | 6-5             | 6-5              |
| 42   | 138  | 138      | 63967            | 6-5                 | 6-5             | 6-5              |
| 43   | 139  | 139      | 63967            | 6-5                 | 6-5             | 6-5              |
| 44   | 140  | 140      | 63967            | 6-5                 | 6-5             | 6-5              |
| 45   | 141  | 141      | 63967            | 6-5                 | 6-5             | 6-5              |
| 46   | 142  | 142      | 63967            | 6-5                 | 6-5             | 6-5              |
| 47   | 143  | 143      | 63967            | 6-5                 | 6-5             | 6-5              |
| 48   | 144  | 144      | 63967            | 6-5                 | 6-5             | 6-5              |
| 49   | 145  | 145      | 63967            | 6-5                 | 6-5             | 6-5              |
| 50   | 146  | 146      | 63967            | 6-5                 | 6-5             | 6-5              |
| 51   | 147  | 147      | 63967            | 6-5                 | 6-5             | 6-5              |
| 52   | 148  | 148      | 63967            | 6-5                 | 6-5             | 6-5              |
| 53   | 149  | 149      | 63967            | 6-5                 | 6-5             | 6-5              |
| 54   | 150  | 150      | 63967            | 6-5                 | 6-5             | 6-5              |
| 55   | 151  | 151      | 63967            | 6-5                 | 6-5             | 6-5              |
| 56   | 152  | 152      | 63967            | 6-5                 | 6-5             | 6-5              |
| 57   | 153  | 153      | 63967            | 6-5                 | 6-5             | 6-5              |
| 58   | 154  | 154      | 63967            | 6-5                 | 6-5             | 6-5              |
| 59   | 155  | 155      | 63967            | 6-5                 | 6-5             | 6-5              |
| 60   | 156  | 156      | 63967            | 6-5                 | 6-5             | 6-5              |
| 61   | 157  | 157      | 63967            | 6-5                 | 6-5             | 6-5              |
| 62   | 158  | 158      | 63967            | 6-5                 | 6-5             | 6-5              |
| 63   | 159  | 159      | 63967            | 6-5                 | 6-5             | 6-5              |
| 64   | 160  | 160      | 63967            | 6-5                 | 6-5             | 6-5              |
| 65   | 161  | 161      | 63967            | 6-5                 | 6-5             | 6-5              |
| 66   | 162  | 162      | 63967            | 6-5                 | 6-5             | 6-5              |
| 67   | 163  | 163      | 63967            | 6-5                 | 6-5             | 6-5              |
| 68   | 164  | 164      | 63967            | 6-5                 | 6-5             | 6-5              |
| 69   | 165  | 165      | 63967            | 6-5                 | 6-5             | 6-5              |
| 70   | 166  | 166      | 63967            | 6-5                 | 6-5             | 6-5              |
| 71   | 167  | 167      | 63967            | 6-5                 | 6-5             | 6-5              |
| 72   | 168  | 168      | 63967            | 6-5                 | 6-5             | 6-5              |
| 73   | 169  | 169      | 63967            | 6-5                 | 6-5             | 6-5              |
| 74   | 170  | 170      | 63967            | 6-5                 | 6-5             | 6-5              |
| 75   | 171  | 171      | 63967            | 6-5                 | 6-5             | 6-5              |
| 76   | 172  | 172      | 63967            | 6-5                 | 6-5             | 6-5              |
| 77   | 173  | 173      | 63967            | 6-5                 | 6-5             | 6-5              |
| 78   | 174  | 174      | 63967            | 6-5                 | 6-5             | 6-5              |
| 79   | 175  | 175      | 63967            | 6-5                 | 6-5             | 6-5              |
| 80   | 176  | 176      | 63967            | 6-5                 | 6-5             | 6-5              |
| 81   | 177  | 177      | 63967            | 6-5                 | 6-5             | 6-5              |
| 82   | 178  | 178      | 63967            | 6-5                 | 6-5             | 6-5              |
| 83   | 179  | 179      | 63967            | 6-5                 | 6-5             | 6-5              |
| 84   | 180  | 180      | 63967            | 6-5                 | 6-5             | 6-5              |
| 85   | 181  | 181      | 63967            | 6-5                 | 6-5             | 6-5              |
| 86   | 182  | 182      | 63967            | 6-5                 | 6-5             | 6-5              |
| 87   | 183  | 183      | 63967            | 6-5                 | 6-5             | 6-5              |
| 88   | 184  | 184      | 63967            | 6-5                 | 6-5             | 6-5              |
| 89   | 185  | 185      | 63967            | 6-5                 | 6-5             | 6-5              |
| 90   | 186  | 186      | 63967            | 6-5                 | 6-5             | 6-5              |
| 91   | 187  | 187      | 63967            | 6-5                 | 6-5             | 6-5              |
| 92   | 188  | 188      | 63967            | 6-5                 | 6-5             | 6-5              |
| 93   | 189  | 189      | 63967            | 6-5                 | 6-5             | 6-5              |
| 94   | 190  | 190      | 63967            | 6-5                 | 6-5             | 6-5              |
| 95   | 191  | 191      | 63967            | 6-5                 | 6-5             | 6-5              |
| 96   | 192  | 192      | 63967            | 6-5                 | 6-5             | 6-5              |
| 97   | 193  | 193      | 63967            | 6-5                 | 6-5             | 6-5              |
| 98   | 194  | 194      | 63967            | 6-5                 | 6-5             | 6-5              |
| 99   | 195  | 195      | 63967            | 6-5                 | 6-5             | 6-5              |
| 100 | 196  | 196      | 63967            | 6-5                 | 6-5             | 6-5              |
| 101 | 197  | 197      | 63967            | 6-5                 | 6-5             | 6-5              |
| 102 | 198  | 198      | 63967            | 6-5                 | 6-5             | 6-5              |
| 103 | 199  | 199      | 63967            | 6-5                 | 6-5             | 6-5              |
| 104 | 200 | 200      | 63967            | 6-5                 | 6-5             | 6-5              |
| 105 | 201 | 201      | 63967            | 6-5                 | 6-5             | 6-5              |
| 106 | 202 |

— page 182 —
1. USS COBIL - Fourth Tar Patrol, report of. (Cont'd)
2. - ATTACK DATA:
   - U.S.S. COBIL. Torpedo Attack No. 2 Patrol No. FOUR
   - Time: 0238 30 March 1945 Lat.11-49.9N Long.109-21.43
   - TARGET DATA:
     - Ship Sunk: Nono.
     - Target Draft - 3' Course 215 Spond 2.5 Range 1,950
     - Own Ship Speed 2.5 Course 130 Depth 64 Range 0
     - Target was first picked up on radar at 11,000 yards traveling about 1-1/2 miles off coast on a so.tonary course. Tracked hit on radar and ran ahead of it and dove to radar depth because of the clear moonlighit nigh. Because of sharp dip and slight silhouette thought hit to be a submarine. Picked him up in periscope at 4,200 yards and went to periscope depth. Had cut sail at 2,300 yards. He found had doubtful screw noises on his bearings, decided to let hit. Have one on change that he was disqualified but. "with a roof" UDO solution on fish was fired and went tracked by sound to run hot, straight and normal.

FIRE CONTROL AND TORPEDO DATA:

| Data | Value |
|------|-------|
| Tube Track | 7 92'P 174 3 |
| Gyro Depth | 3 High Miss - ran under. |
| Depth | 3 |
| Power | High |
| Hit-Plus | Miss - ran under. |
| Erectile | No |
| MC. Torpedo | 18-2 57'07 8-5 8344 Contact |
| Serial | |
| MC. Exploder | |
| Serial | |
| Solution Set | |
| Actual Actuation | |
| MC. Tarhead | 16-2 4254 Torpax-2 |
| Serial | |
| Explosive | |
| Firing Interval | |
| Type Spread | MOT Shot |
| Sea Condition | Calm |
| Overhaul Activity | U.S.S. JULY 11. |

— page 183 —
U.S.S. COEL. - Fourth War Patrol, report of. (Cont'd)
H - ATTACK D.T.
U.S.S. COEL. Gun Attack No. 1 Patrol No. FOUR
T.I.C.: 1630 26 February 1945 Lat.06-075 Long.114-06E
T.R.CRY D.T. - DAMAGE INFLICTED
SUNK: Sea Truck of 300 tons.
D.N.CR
DIST.RECORD BY: Observed to sink.
DNT.I.S: Target sighted at 1632 bearings 318 T, range 16,000 yards on course 060 T speed about 6 knots. He was pitching violently in the rough seas and had no large guns showing.
Closcd to 2,500 yards on his starboard quarter and opened fire with 40mm. His return fire astonished fire. 30 caliber was extremely wild and ineffective. Closed to 2,000 yards and opened fire with 4 inch. Obtained hits at once and turned to parallel hit

— page 184 —
U.S.S. COILA - Fourth Year Patrol, report of. (Cont'd)

Gun Attack No. 1
: 1400 yd.
: 800 yd.
: 31-10N
: 29

Gun Attack No. 2
: 800 yd.
: 31-10N
: 29

— page 191 —
6D Rada: performance was good. Casualties are tabulated below.

1. Indications:
   - Jumping of the sweep on the cathode ray oscilloscope and arcing at the base of the antenna fo'c'sur.
   - Broken insulator holding the fo'c'sur on the di'plexor.
   - Replaced broken insulator.

2. Indications:
   - Same as on above.
   - Water running down mast through packing where antenna enters ship.
   - Replaced water. This trouble has occurred on other runs and it is considered a minor fault of the design.

JARRING and INTERFERENCE.

No jarring of the 6D was encountered. Interference was noted on two occasions when friendly U.S. submarines were known to be near our position and was characterized by railings on the cathode ray oscilloscope.

APR Report.

The performance of the APR and SPE-1 indicator was very good. A directional antenna would be a great help.

Jap Radars Detected:

| Frequ. | PRF | PI | Our Position | Remarks |
|-------|-----|----|||
| 150   | 1000| 7.5| Lor-bok strait & vicinity. Probably land base. |         |
| 165   | 500 | 7.5| "          |         |
| 195   | 1000| 7.5| "          |         |
| 210   | 500 | 7.5| "          |         |

— page 193 —
5. CUBL - Fourth War Patrol, report of. (Cont'd)

R: SOUND AND SOUND CONDITIONS.

Sound conditions in Java Sea wore excellent ranges up to 1,000 yards being obtained on escorts and small naus.

Sound conditions off Padaran wore average.

0 - DENSITY LAYERS.

On 27 February a varying negative gradient was over-porcineed while passing through Lombok Strait running at 150 feet - the greatest gradient of six degrees found at the north entrance.

No gradients wore experienced during passage through Java Sea and Karimata Strait.

In the vicinity of Cape Padaran, French Indo China - the following gradients wore observed after two or three day periods of extremely calm weather. Those gradients wore destroyed by a 4 soa or greater.

1. Lat. 09-15.6 Long. 109-59.8 - 3/19/45 - 320' dive. Eight degree gradient between 80' and 120'.

2. Lat. 10-56.8 Long. 109-46 - 3/21/45 - 120' dive. Six degree gradual gradient between 20' and 100'.

3. Lat. 11-12.1 Long. 109-58.5 - 3/22/45 - 120' dive. Seven degree gradual gradient between 30' and 100'.

— page 194 —
35. COBIL - Fourth War Patrol, report of. (Cont'd)

1. HULL, FOOD AND HEALTH, REPORT.

2. "In the personal casualties, DESMOND and HUSTON were seriously handled by H.L. STRAUSS, PH.M.L., U.S.N.

Because of the weakened condition of both men oxygen was distributed to assist their breathing. Some form of oxygen mask or tent would have been more efficient than the jury rig of cloth and smoke mask that he used.

Two cases of anthraxal fever responded well to early rest and treatment.

Food was wholesome and adequate. Potatoes were raised toward the end of the run and the dessicated variety still are not entirely satisfactory.

Habitability was entirely satisfactory.

Q - PERSONNEL.

Number of men on board at start of run......71
Number of men qualified at start of run......41
Number of men qualified at end of run......55
Number of unqualified men making first run......15
Veterans in rating during run......4
Veterans age of crew......21.4
Veterans age of officers......27.4
Number of men with less than 2 years in Navy......1.9
Number of men with more than 6 years in Navy......4

Attention is invited to the happenings of 21 February in which KURZLE, K.M., MOHMLE, U.S. distinguished himself and demonstrated exceptional courage, quick-thinking, and disregard for personal safety.

- 39 -

— page 197 —
15 April 1945
SUBARINE SCUDDRON TRIMY-TWO
16 April 1945

CONFIDENTIAL

FIRST ENDORSEMENT to:
U.S.S. COBIL (83245) - Report of Fourth War Patrol.

Subject: U.S.S. COBIL (83245) - Report of Fourth War Patrol.

north, verified by the commotion and gestures of crew members as they watched torpedoes pass under the hull. No anti-submarine measures were received on this attack. A suspicious contact was made during the night of 30 March, and a submarine approach was conducted. Target was noted to have a sail rigged, and un-certain sound information reported the Corroding Officer to fire one torpedo at that he thought might be an enemy submarine under sail. The torpedo missed. The decision to attack was probably based on the definite contact several days earlier with a I-121 class submarine. This latter contact was made close inshore during daylight surface patrol and was not sighted after diving for an approach.

One floating mine was sighted off CRIMBERLY on 29 March; a properly marked hostile ship was contacted 31 March; and two definite porisco contacts were made 3-4-31 south of P.D.RAN, No evidence of offensive action was noted while opening the range on evasive courses. On 8-4-31, during sub-marined patrol, the COD sighted one unidentified "lance, too P-383, one Lieutenant and one Catalina simultaneously, both with SD mast and WIF antennas, with an attempt was made to communicate, both with SD mast and WIF antennas, with no results. The Catalina was seen to land, after which the Corroding Officer surfaced and closed plane, in the meantime establishing communications with one of the P-383. Information was received that a ditched Lieutenant's survivors were in the vicinity. The COBIL subsequently picked up seven crew members. The remainder had been recovered by the Catalina. All were in excellent condition having been in the water about one hour.

5. The material condition of the COBIL on return from patrol is above average and a normal raft will be conducted. The morale, health and appearance of the officers and crew does not show any ill effects from this long patrol, and they are welcomed alongside their own Tender for the COBIL's first raft by Squadron Twenty-two forces. They are congratulated on the successful completion of another war patrol, the enemy inflicted on the enemy, and upon the excellent manner in which seven Army fliers were rescued.

6. The Squadron Commander joins the Corroding Officer in regret over the loss of HOUSTON, Ralph Clark, Jr., 755-96-96, SLC, V-6, USNR, by enemy action. The loss of these heroic men while giving their full measure of valiant conduct is a reminder inspiration to the Submarine Service.

( ) . SUITS.

— page 198 —
1945-06-14
Serial 0866
C-O-N-F-I-D-H-N-T-I-A-L
SECOND ENDORSEMENT to:
USS COBIA Conf. Lt. A16-3
Serial 012, dated 15 April, 1945. Report of Fourth War
tartol.

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

Subject: U.S.S. COBIA (SS845) - Report of Fourth War
Patrol, Comment cn.

1. The Fourth War Patrol of the COBIA, under the command
of Commander A. L. BEACHER, U.S.N., was conducted in three phases as
outlined in the First Endorsement.

2. The Commanding Officer's decision to return DESMOND,
F. E., NoMilo, U.S.N.R., to EQUOUTH for medical treatment, following
the unfortunate casualty in the forward engine room on 21 February,
was correct.

3. The loss of HUSTON, R. C., Jr., Slo, U.S.N.R., as a
result of wounds sustained at 1822 on 26 February during a gun battle
with the enemy is deeply regretted. During this gun action the range
was closed to well inside the range of the enemy armament, and COBIA
received hits upon two occasions. The first series of hits occurred
at 1616, and caused a fire in the magazine of the 20th gun. The
second series of enemy hits occurred at 1822 and resulted in HUSTON's
receiving a mortal wound and BROTHIL, T. H., FCO, U.S.N.R., receiving
a superficial wound. Following these incidents COBIA opened to
a safe range and proceeded to deliberately and skilfully destroy the
enemy. Two sea trucks were sunk in this engagement.

4. On 8 April seven downed aviators were rescued in the
CAPE PARARAN AREA.

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

6. The Force Commander congratulates the Commanding
Officer, Officers and Crew of the COBIA, for the
long patrol and upon the rescue of seven aviators. The following
damage to the enemy is assessed:

MAY 24 1945

23-6 Ramp 2055
23-6 23 MAY 1945/52545
170636
23-6

— page 199 —
24/1/45
Serial_0806
C-O-N-F-I-D-E-N-T-I-A-L
4 May 1945.

SECOND INDIRECT TO:
U.S. COBRA Conft. Lt. A16-3,
Serial C12, dated 15 April,
1945. R.port of Fourth War
Patrol.

Subject: U.S.S. COBRA (SS845) - Report of Fourth War Patrol - Comment on.

S-U-K-K

2 - MIS (EU) (300 Tons each)*
600 Tons

* - Sunk by gunfire

JAMES FIFE.

DISTRIBUTION

Conlnch (3) Direct CTG-71.8 (2)
Vice Opnav (2) Direct ComSubRon-22 (2)
Vice Opnav Op-23o (1) ComSubRon-26 (2)
ComlstFlt (1) ComSubRon-30 (2)
Com2ndFlt (1) LivOc SubRon-22 (1 each)
Com7thFlt (2) LivOcSubRon-26 (1 each)
ComSublstFlt (30) LivOcSubRon-30 (1 each)
ComSubs2ndFlt (4) S/M School; N.L. Conn. (2)
CTF-71 (7) Omdbr. NVD, Puget Sound (1)
CTG-71.5 (2) Subd, Mare Island (2)
S/M 7thFlt (1)

THIS REPORT WILL BE DESTROYED PRIOR TO ENTRY INTO ANY CONTROLLED WATERS.

4. B. MILLER,
Flag Secretary.

— page 200 —
25 MAY 1945
Serial 03023
CONFIRMATION
TERRAD INDICATOR ON:
CO, USS COBIA Conf. Lt.
Serial 018 dated 15
April 1945.
From: Commander Seventh Fleet.
To: Commander in Chief, United States Fleet.
Subject: U.S.S. COBIA (SS245) - Report of Fourth War
Patrol - Combat on.
1. Forwarded.
2. The Commander Seventh Fleet congratulates the
COBIA for the damage inflicted on the enemy and the rescue
of seven aviators.

Copy to:
CommSbu, 7th Flt
ComSubdr 22
CO, USS COBIA (SS245)

— page 201 —
0/0 Fleet Post Office,
San Francisco, Calif.
18 June 1945.

C-DECLASSIFIED I--I

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

Via: Official Channels.

Subject: U.S.S. COIL. (SS245) - Report of War Patrol
Number FIVE.

Enclosure: (1) Subject Report.
(B) Track Chart.

1. Enclosures (1) and (B) cover the FIFTH War Patrol of this vessel during the period May 9, 1945 to June 18, 1945, are forwarded herewith.

DECLASSIFIED ART. 0445, OPNAVINST 5510.10C
BY J. P. O'BROLD
DATE 3/12/45

DECLASSIFIED

— page 202 —
1945 - Normal refit completed by SubDiv 221 and U.S.S. HOWARD V. GILMORE. Following alterations accomplished:
   (1) Additional valves installed in blow lines to Bow Buoyancy, Safety and Negative tanks.
   (2) Mark VIII IET's installed.
   (3) True - Relative Bearing Indicator installed on SJ radar.
   (4) Replaced attack periscope. Not decremented, not docked.

Following equipment not brought within sound limits:
   (1) Both air conditioning units.
   (2) Main motor standby lube oil pump.
   (3) Number One lighting motor generator.
   (4) Number Two IC motor generator.
   (5) Sound training motors.

Detached Lt. J.L. TUTTS, D(L), USNR and Lt. (jg) W.S.C. HENRY, D(T)(L), USNR.

Lt. (jg) L.A. DAVIS, USNR and Lt. (jg) E.D. LONGFELLOT, E(L), USNR reported for duty.

May 8, 1945 - Major R.C. KISSACK, USAF reported on board as observer. Ready for sea.

B - NARRATIVE

OFFICERS

Comdr. A.L. BECKER, USNR
Lt-Cdr. J.J. SIBLEY, DE, USNR
Lieut. J.P. MARION, Jr., USNR
Lt (jg) S.E. HENDERSON, Jr, DE, USNR
Lt (jg) L.H. DAVIS, USNR
Lt (jg) D.C. FELTON, DE, USNR
Lt (jg) P.D. ROSENBAKER, D(L), USNR
Lt (jg) E.D. LONGFELLOT, E(R), USNR
Ens. E.L. BROWN, D(L), USNR

War Patrol Experience at Commencement this Patrol

9 (5 BLACKFISH 4 COBIA)
6 (2 S-32 4 COBIA)
4 (COBIA)
4 (COBIA)
3 (COBIA)
3 (COBIA)
3 (2 BACHAT 1 COBIA)
1 (BASE)
1 (COBIA)

Enclosure (L)

— page 203 —
1945
CHIEF PETTY OFFICERS
JENKOFSKY, A., CTM; USN.
MACARTEUR, L., CDM, USN.
REMILLARD, E.D., CMOMM, USN.
BAKER, R.A., CRM, USN.

ALL ITEMS ITEM
May 9, 1945
Noon Position - ...longside GILMORE.
Underway for Fifth War Patrol in company with U.S.S. WILLETT (D3302).
1550
Commended training exercises with WILLETT.
2111
Released escort.
May 10, 1945
Noon Position - Lat. 14-48N Long. 115-18E
Underway to station conducting emergency drills, section dives, and battle problems daily.
May 11, 1945
Noon Position - Lat. 11-52N Long. 112-02E
Conducting training enroute.
1745
Practice battle surface.
1747
SJ Radar out of commission.
May 12, 1945
Noon Position - Lat. 8-56N Long. 108-29E
Received Vopacom message from USS BREHM - would not break but signal was very strong. Assumed she had contact on us with no radio interference so hastily reassembled receiver.
0140
Strong SJ interference from port bow. (Ship Contact No. 1)

— page 204 —
1. U.S.S. COSMIC - First War Patrol - report of. (Retrieve cont)

May 12, 1945 (continued)

0150 Having tried to break ERRM's message in all .OPACO on board - - fired recognition rocket to preclude any possibility of mistaken identity. BRRM answered immediately with rocket.

0235 Closed ERRM for voice conference and test of VHF.

0300 Parted company with ERRM. Having found that S7 re-pairs were going to take some time broadcast Topaco message telling all and sundry that our S7 was out of commission and giving position.

1110 Master gyro out of commission.

1245 Dove to work on radar, gyro, No. 2 air compressor and hydraulic plant (see Major Defects).

1636 Surfaced. Ship in full commission.

May 13, 1945 Noon Position - Lat. 7-28N Long. 104-25E

1236 Entered area. Headed for Pulo Panjang.

May 14, 1945 Noon Position - Lat. 9-44N Long. 103-59E

Issued OTC of group composed of USS FLAMMORED, HMS SUPREME, Directed NAMED patrol point 32 miles southwest Pulo Vai and informed him of our intention to patrol south of Pulo Vai. Unable to establish communication with SUPREME.

0204 Made landfall on Pulo Vai by radar.

0610 Commenced patrol 10 miles south of Pulo Vai.

0638 Rader contact range 22,000 yards bearing 120°T. T ships on base course about 250. (Ship Contact 10. 21. Commenced tracking.

0703 Battle stations torpedoes.

0713 With dawn silhouetting targets went to radar depth. Target tracing nicely at 9.5 knots base course 250°T, 30° zigs at about 10 minute intervals. Escort patrolling on his starboard bow.

— page 205 —
0720
Tent to periscope depth. Target zigged 300' toward putting us in ideal position for a bow shot with this time the escort zigged across to take position on his port bow. Periscope observation showed him crossing our bow with a 900 track with about a 500 yard run. Made snap decision to shoot him with three fish and then to fire the remaining two at .K. Made quick set up. Told assistant torpedo O. officer to use 70 foot masthead height. Conning Tower taller, a new man making his first run in this ship, heard 70 feet mentioned and passed word to Diving Officer to run at 70 feet.

0735
Raised eriscoop for firing bearing, gyros (generating to 0, range 700, track 90 when periscope dipped.

0737
Periscope out again - commenced firing forward. (Torpedo attack No. 1). By this time the track was 130 and the gyros about 40 R. Observed two fish broaching down range. Target turned away and combed tracks. Decided and did fire remaining two fish at him on 150 track. Commenced swinging left for stern shot at .K.

0740
AK turned away. Swung back to escort hoping to shoot him down the throat. However TDC commenced acting erratically. Range to angle solvers jumping all over the scale. Could not get around for 180 gyro Bow and arrow shot in time so

0743
Vent way down to 120 feet (depth of water 145 feet) rigging for depth charge.

0745
First pattern of six depth charges - astern, port, and above - fairly close.

0755
Second salvo of four c : es - astern, steerboard, above and below - further out.

0802
Came up to periscope depth. Escort was astern tearing all over the landscape, AK was ahead range about 4,000 yards with 90 angle on bow apparently moving very slowly. Commenced reload forward and second approach on .K.

0826
Escort turned toward and AK turned away. Tent back down to 120 feet, reload completed. TDC still out.

0845
Escort passed directly overhead making 13 knots.

— page 206 —
5 -

May 14, 1945 (continued)

0935 Escort having opened range came up to periscope depth. Escort searching area to northwest of us. Continued clearing area on course 270°T

— page 207 —
1945 (continued)
Main control cubicle seemed to be in order so decided to get underway so as to give him a moving target. He dropped a single charge at this time and headed away on course 2500T.

At periscope depth escort way off and getting further. Headed in his direction and commenced rep. ins. Main damage: All torpedo tubes forward out of commission, Nos. 1,3,4,5 and 6 with 1t gyro spindles and No. 2 with 1 loose gasket in dra.n valve. No. 7 tube out of commission with bent gyro spindle. Mk. 18 torpedo No. 55932 with main motor flooded. TDC inoperative. High pressure blows to Bow Bouyancy, Negative and Safety leaking badly.

With TDC operating, high pressure blow valves tight and all after tubes and two forward tubes in commission surfaced and vent ahead full in direction YYYY. Disappeared. No. 4 engine would not take full load. Suspectod overload relay main cubicle so put No. 4 on charge. Sont messag to H.MERRILLD requesting information. H.MERRILLD replied with position of convoy.

Noon Position - Lat. 9-27N Long. 101-32T
Made radar contact on convoy. (Ship Contact No. 3) Commenced and around to port. Escort on starboard bow of tar.ct.

Vent to battle stations torpedoes.

H.MERRILLD sent message indicating she was attacking from starboard.

Target zigged toward giving us 140 angle on bow. Escort headed out to starboard. Plain language from H.MERRILLD saying escort was chasing him and tolling us to take the X. Fut u. 4 on the line and commenced pulling up on target. No. 3 tube back in commission.

Escort had dropped back directly astern of target, range 8,000 yards.

Escort commenced firing. Has mentally sympathizing with H.MERRILLD when fright train passed overhead and landed about 2,000 yards over. Didn't see how he could have soon use at 8,000 yards so hold course to see if he was just guessing.

— page 208 —
15, 1945 (continued)

0104: He was sure. He let go another salvo - wild this time - and turned toward and speeded up. Put him astern and started tracking him on TDC and Maru on slot. To found we could log 16,5 with our 3 engines, his speed 16, Put him 300 on quarter and kept on an end around pulling away from him at same time. He fired a couple of more times - one alone (1,000 yards) and the other wild. Maru zigged right. Tood we could beat Y.M.M. to him. Could see Maru slihtcutted against intermittent lightning flashing behind him. Escort slowed to 13 and headed toward Maru.

0135: Made ready tubos and turned in, having attained position 800 9,000 yards on port bow of target. Escort 10,000 yards on port quarter of target.

0140: Two torpedo hits on target soon and hard. Escort headed for target at 17 knots. H.M.M.D reported no torpedoes remaining. Continued in standard speed to finish him off if he needed it.

0159: He didn't. Target sank. Escort commenced firing at us again, range 4,000 yards. All over us with sound offoots. Headed away at flank speed. Escort chased swinging 300 away and letting go another salvo at 0202.

0205: Escort dropped a couple of depth charges and headed toward some of sinking at 13 knots. Pulled clear to give him a little time to calm down. End SJ interrogate at 2950T. Exchanged recognition with H.M.M.D and commenced closing him. To needed spare gyro spindles and a specu pulsor network for SJ. Figured we could find Y.M.M. later picking up survivors and maybe a little loss alert. Message from SUPROMO read: "quest instructions. Give him position of attack and informin' him we would try to trail Y.M.M."

0343: Made rendezvous with H.M.M.D. (Ship Contact No. 4) Exchanged complaints, for condolences and spares - used rubber boat for spares and megaphone for chin music. H.M.M.D told us she had gotten dug hit into Maru about noon. Probably that was what called our friend away from us with his job half done.

0421: H.M.M.D promised to serve us a little beer and headed for Frontal. Back to the salt mines for us. Started toward the scene of sinking and spent remainder of night chasing rain squall jets and "objots-on-horizon".

0600: Hydraulic vent and repolishing tank in after torpedo room e rrioc away.

— page 209 —
1945 (continued)
0805 Dove and headed for some continuing repairs.
1015 Sighted aircraft - (Fako) - searching area.
1501 Surfaced. All tubes back in commission.
1530 Sighted lifeboat full of survivors. Many men in water. Took moving pictures. Did not want prisoners this early in patrol. Destroyed all large unoccupied bits of wreckage with 40m fire.

The rules of war are hard to understand. Here wore about 75 healthy Jap sailors in uniform with lifeboat and lots of wreckage to hang on to. Floats out looking to send air. Chances that they would live to continue the war against us excellent. He had to let them go. Had they been in the same condition as the boats that would have been no hesitation about shooting them. Howsoever, such is the law by which we live.

1630 Recovered life ring fr. MOTTORI KURU. Data on this ship checked exactly with target as observed on morning attack. Heeded for southeastern corner of area to better ship for repairs to main outboard.

May 16, 1945 Noon Position - Let. 6-53N Long. 101-57W
0742 Submerged.
0900 Bottomed in 20 fathoms of water. Secured cubical for repairs and deck. Cubical norail, trouble found in covorner to No. 4 engine - repaired by ship's force.
1025 Underway and conducted pariscope patrol along 20 fathoms curve. Sighted a couple of junks during day.
2021 Surfaced.
2207 Sighted submarine on surface. Varnosed trackline. Sent message to SURFMET informing her of contact and position and asking if it were he. It was.
2344 Made rendezvous with SURFMET (Ship Contact No. 5) and agreed on operations for next few days. He informed us he had searched Patina Roads and found it vacant.
2357 Headed up 20 fathoms curve intending to circuit Gulf.

— page 210 —
U.S.S. COT.I. - Fi.  Var Patrol - report of. (  )rrative cont)

May 17, 1945    Noon Position - Lat. 8-45N Long. 100-55E
Continuing sweep of Gulf.

2155    All stop. Put plug in officer's head discharge and
    repinrod sea valve.

2352    Repairs completed. Blow out plug and resumed patrol.

May 18, 1945    Noon Position - Lat. 10-32N Long. 99-36E
Submerged patrol off Sawl Bay.
Received message from H.M.S. KHEMILL asking for rendezvous
next night.

0037    Sight and radar contact on junk followed by second
    contact at

0333    Evaded both. (Ship Contact Nos. 6 & 7).

0812    Submerged.

1234    Surfaced and set course for rendezvous.

May 19, 1945    Noon Position - Lat. 9-32N Long. 108-19E
Surface patrol northwest Fulo Tai.

0525    Rendezvous with H.M.S. KHEMILL. (Ship Contact No. 8)
Agreed I would patrol north and he south of Lat. 9
for next few days. Thanked him for taking such excellent
contact of our late adversary.

0605    Parted company.

1309    Submerged for bottle problem and drills.

1540    Surfaced.

May 20, 1945    Noon Position - Lat. 9-19N Long. 103-29E
Submerged reconnaissance of Fulo Penjang.

0731    Submerged and circled Fulo Penjang looking for signs
    of military installations. Lots of trees and one
    anchored junk observed. (Ship Contact No. 9).

1309    Hold battle problem.

— page 211 —
1945
Noon Position - Lt. 11-32N Long. 102-28E
Nobody home large enough to show at 20,000 yards.
Headed north for surface swing around Gulf.

1635
Submerged for battle problem.

1724
Surfaced. Closed in for search of coast at 10 miles
during night. Opened to 20 fathom curve during day-
light.

May 22, 1945
Noon Position - Lt. 11-36N Long. 100-07E
Surface search along 20 fathom curve.

1300
Submerged for battle problem and drills.

1625
Surfaced.

May 23, 1945
Noon Position - Lt. 10-32N Long. 99-32E
Submerged patrol off Chusan Bay.

0057
Radar and sight contact on large junk. Evaded.
(Ship Contact No. 10)

0722
Submerged for periscope patrol.

1328
Hold battle problem.

1411
Surfaced and headed out for surface patrol of middle
of Gulf.

May 24, 1945
Noon Position - Lt. 10-05N Long. 101-10E
Surface patrol.

1305
Submerged and hold battle problem.

1500
Surfaced and headed for rendezvous with KRAKEN and
BERGILL.

May 25, 1945
Noon Position - Lt. 8-12N Long. 102-49E
Surface patrol on scouting line.

0615
Made rendezvous with KRAKEN and BERGILL. (Ship
Contacts Nos. 11 & 12) Received mail and 10 gallons
hydraulic oil from KRAKEN and petrol plans from
BERGILL. Talked situation over by VHF.

- 10 -

— page 212 —
1945 (continued)
0655 Headed for patrol station.
0730 On station.
2130 Readjusted with BURKELL and BULLARD. (Ship Contact No. 13). Received plans by VHF.
2230 Opened out for new station.

May 26, 1945 Noon Position - Lat. 8-21N Long. 102-15E
Petrolling assigned line.
1620 Jake sighted approaching from out of sun. Dove and received one bomb - net close.
1758 Surfaced and continued patrol.
2243 Sighted BURKELL closing. (Ship Contact No. 14)
2303 Docked via VHF that we would move up to patrol a line between Koh Krau - Pulo Wai.
2314 Headed for now station.

May 27, 1945 Noon Position - Lat. 9-41N Long. 102-21E
Surfco patrol. Investigated much wreckage during day. Attempted to sink buoy - apparently supporting buoy from not - but were unable to pierce it with 50 cal. fire. Sank one 5" ammunition can and one 40mm can.
1354 Submerged to work on hydraulics system. Conducted battle problem.
1602 Sighted bale of rubber thru periscope.
1625 Surfaced and maneuvered to pick up bale of rubber. Continued closing wreckage in hopes of finding more rubber. Two fishing bells were out solo reward.

May 28, 1945 Noon Position - Lat. 6-54N Long. 101-24E
Continued on surface patrol.
1509 Dove to hold drills and battle problem.

— page 214 —
1945
Noon Position - Lat. 7-58N Long. 101-03E
Passed HAKIBILL on her station six miles abeam to starboard. (Ship Contact No. 16)
On station patrolling as per Pack Commander's orders.

June 1, 1945
Noon Position - Lat. 7-54N Long. 101-06E
Patrolling assigned station.
Sighted junk right on our station. (Ship Contact No. 17).
Dove to avoid being sighted.
Surfaced and continued patrolling station.
Sighted float plane over the shore line of 2450T, range about 25-30 miles, circling and moving slowly north along coast. Suspected convoy under plane.
Horded in towed plane. Broached contact report to pack.
Roversod course and headed to talk to HAKIBILL.
Sighted HAKIBILL and maneuvered to close, she had not received our broadcast. (Ship Contact No. 16)
Ordered to take HAKIBILL and search along coast from north of Lakon Roads.
Sighted junk and closed. Turned out to be loaded with natives giving 'V for Victory' sign and smoking. Cancel cigarettes. Gave them another carton to comment relations and loft. (Ship Contact No. 19)
Sighted HAKIBILL. (Ship Contact No. 20)
Sighted our float plane again - HAKIBILL dove.
Picked up HAKIBILL periscope and at
Hakibill surfaced and we closed to pass on the orders and set out for search area.
Plane headed south.
Hakibill driven down by plane.
Hakibill driven down by plane.

- 13 -

— page 215 —
1945 (continued)
1940 Headed in to close coast and then at
2150 Headed north along 10 fathoms curve to cover the limits
of convoy travel. May be mined hore as we passed
sovcral buoys along 10 fathoms. Ourvc.

2334 Reversed course to check Laken Roads and be in position
at dawn.

June 2, 1945 Noon Position - Lat. 8-05N Long. 100-59°7
Surface patrol.
0430 Began to open coast to return to patrol station.
0612 On station patrolling as ordered.
1840 BRIGILL closed us and informed us that she and her
group were leaving. (Ship Contact No. 21)
1854 Headed north to search routes across Gulf for convoy.

June 3, 1945 Noon Position Lat. 9-43N Long. 102-31E
Surface patrol west Pulo Vai.
0245 Converted 3 and 5 fuel ballast tanks.
0809 Made trim dive end flushed out converted fuel tanks.
0840 Surfaced.
1201 Picked up Pulo Vai.
1720 Dove and held battle problem.
1828 Surfaced and turned into coast to search Kampong and
Riem Bays. Followed coast line eight miles off.
0301 Completed coastal search and headed out for submerged
patrol between Pulo Vai and Pulo Panjang while re-
pairing gyro.

June 4, 1945 Noon Position - Lat. 9-41N Long.103-12°
Submerged patrol west Pulo Panjang.
0729 Dove. Commenced work on main engines and master gyro.
1818 Surfaced to change air in boat.

— page 217 —
1945
Noon Position - Lat. 7-05N Long. 105-39E
Heading: for the barn.

0310 Made radar contact bearing 250T, range 17,000 yards. Commenced tracking. Target on course 0550T, speed 9.5 knots steering steady course. (Ship Contact No. 22)

0320 Made out smaller pip 50 yards on port quarter of target.

0325 Third pip range 12,000 yards in position 10,000 yards on port beam of large target.

0330 Battle stations torpedoes. Based in to 4,000 yards on starboard bow of target. Barely visible in extremely black night was a large heavily laden tanker - 500 feet long by binocular formula. With the 20 fathom curve 20 miles distant precluding diving; an unidentified escort to evade; a second target to attack and a landed tanker that would probably explode and light up the whole ocean when hit; decided to make attack with stern tubes with torpedo run about 3,000 yards and pull clear of the forward after shooting.

0410 With 90 starboard track, run 3,300 yards, and gyro angles 206, fired four Mark XIII torpedoes. (Torpedo Attack No. 2) Sent ahead flank to clear. Once torpedo seen to breach aft or short 1.00 yard run.

0413 One duck hit near on bridge, sound and through hull. Timed exactly for first torpedo. Target continued on course and speed. Escort opened sightly.

It had been a long time since COBL had heard her torpedoes explode against enemy hull. Decided to give this baby all way and not then worry about the others. Reloaded aft and headed in for bow shot.

0438 With initial run of 2 300 yards, zero gyros and 80 starboard track, fire six Mark XIV Torpedoes forward. (Torpedo Attack No. 3). Turned right to take position for stern shot with 1,500 yard run. First and fourth torpedoes were soon to take a joe to the loft before settling down on their run. Scoped and fifth torpedoes hit - second under bridge and fifth half way between bridge and after structure. Target made excellent diving time until nose stuck in the mud. Stern ran into sticking out for about 20 minutes. Lots of dim lights flashing out as crew abandoned ship. He was silhouetted against intermittent lightning flashes until at

— page 218 —
1945 (continued)
0500 Target sank.
Supposed escort reversed course and cleared area on course 2350T speed 10. Loaded last three Mk. XIV's forward. Headed for second target.
0510 Second target in sight - a second heavily laden tanker. 430 foot long by binocular formula. He was apparently unaware of the fact of his pal - or maybe they just weren't speaking.
'Anted to make sure of this one with last three fish forward so, at
0518 'With 1,300 yard run, gyros 350, 80 starboard track, fired three Mk. XIV torpedoes set at 6 foot. (Torpedo Attack No. 4).
0519 All three fish hit. The target exploded in the most spectacular flesh I have ever seen. Large chunks of him landed all around. All that remained was a large column of flame from burning gasoline. Broke out the movie camera and recorded this for posterity. Lot all hands take a look while we took off after our remaining friend.
0545 Racquainted radar contact range 12,000 yards bearing 2350T. Commenced tracking and on around to starboard. How is zigging about 40 to 60 at about 5 minute intervals, base course 240T.
'Torked up ahead of him until at
0634 'With range 2,800 yards he zigged across, giving us a 50 port angle on bow. Kept tail toward as I slowly pulled off track until, at
0637 'With 1,200 yard run, 72 port track, gyros 197 and depth set 6 foot fired three Mk. XVIII torpedoes. (Torpedo Attack No. 5). Sound tracked fish under target who turned toward after torpedoes passed under. Target could not be identified but was about 200 feet long by binocular form. He was riding his her out of water than had been other targets. Probably a small coaster. Set last remaining fish at 2 foot and, at
0644 Fired last torpedo - run 1,000 yards, gyro 179, track 40 port. Torpedo sank at firing point.

— page 219 —
1945 (continued)
"With black night preel I use of open sights, no
trainer's sight on 4" gun, unknown armament on tar-
rot, and dawn 15 minutes ofi, reluctantly tossed this
ono back and bot on four engines and headed for deep
water.

0830 Crossed 20 fathcm curve.

1342 Made trim dive.

1403 Surfacod.

June 9, 1945 Noon Position - Lat. 01-59N Long. 107-05E

0745 Exchanged recognition and calls with USS LIMPERY.

0753 Sighted LIMPERY. (Ship Contact No. 23)

1342 Sighted KRACK and closed to pick up mail. (Ship
Contact No. 24).

1359 Received mail and continued.

1724 Sighted plane at 15 miles (Betty). Did not dive.
Plane crossed ahead from port to starboard.

June 10, 1945 Noon Position - Lat. 02-36S Long. 109-16E

Submerged pesque o - Karim. ta Strait.

0630 Entered Karimata Strait.

0736 Dove and ran strait at 2/ speed.

1539 Surfacod and ventilated boat.

1606 Dove and continued.

2018 Surfacod and began transit of Java Sea.

June 11, 1945 Noon Position - Lat. 5-26S Long. 112-24E

Transiting Java Sea.

1255 Bawon Island abeam to starboard 22 miles.

1349 Sighted Jeko on port bow dist-nco about 6 miles.
Submerged.

— page 220 —
U.S.S. COBIA - Fifth Var Patrol - report of. (Narrative cont)

June 11, 1945 (continued)

1352 One bomb - ferily olose.

1500 Surfaced.

1520 Sighted plane (Botty) and coming in distance about 15 miles. Submerged. Decided to relax and let them go on about their business.

1706 Surfaced and continued.

0220 Passed Goa Goa abeam to startoard, 7 miles.

June 12, 1945 Noon Position - Lat. 0-05S Long. 115-35E

0645 Sighted unidentified small craft. Submerged to investigate - was small sailing boat. Commenced submerged transit of Lombok Strait. Three sailboats but no petrol craft.

1955 Surreced and finished transit on surface with no difficulty.

2242 Crnkease explosion in No. 1 main engine. (See Major Defects).

June 13, 1945 Noon Position - Lat. 12-22S Long. 115-12E

Enroute Onslow.

0050 Pip on radar, range 4,700, bearing 160CT. Approached cautiously. Scanned to be a number of small pips covering an area about 700 yards radius. Tracked zero speed. Could make nothing out. Approached to 2,000 yards and then continued.

0240 Sighted series of 8 red flares similar to Very pistol flares. Duration of flare about 3 seconds, interval between flares 5 seconds. Bearing was 160CT distance judged to be about 10 miles. Headed toward.

0322 Had very weak carrier signal on 500 Kcs. Swing ship to get bearing. Bearing sounded to be 160CT. Fired green very star and headed toward.

0335 Fireo second green star.

— page 221 —
15, 1945 (continued)
0347  Fired third green star.

Our observer, Major Kisseck, informed us that the Gibson Girl emergency transmitter would not put out such a signal.

To had covered immediate area from which flares originated, the firing of eight 11-rows one after another was not in accord with air sea rescue instructions. We had gotten no answer to our green flares, we had no information of any allied survivors in the area. This was could easily be aware of our transit of Lombok that night and could be trying to crew us into a trap. Decided to clear area and send message asking for information on any allied survivors near the area. Intended to come back: and search by daylight if any survivor were known to be down in the vicinity.

1018  While running No. 1 mail engine for t.st, second cranksaw explosion occ...d. (See No. 1 engine MUTTIC7, Herald ii., 307-30-61, Flo, V-1, UDNR, received first and second decree burns on face, hands, neck and abdomen. Secured tests on No. 1 engine pendant complete disassembly and investigation.

Received information that no allied flares were known to be down in the area of last night's contact.

1702  Submerged and held battle problem.

1745  Surfaced.

June 14, 1945  Noon Position - Lat. 17-305 Long. 113-50E

Enroute Onslow.

0130  Exchanged recognition with USN ARRIDD via 3T.

1530  Held battle problem on surface.

June 15, 1945  Noon Position - Onslow Jetty.

0428  Made radar landfall on anchor Island.

0842  Moored steerboard side to Onslow jetty. Received 20,513 gallons diesel oil.

— page 222 —
15. 1945 (continued)
Treated all hands to one bottle of beer.
All mooring lines on the jolly having been parted
the previous weeks, left our four mooring lines for
the convenience of boats not carrying lines.

1235 Underway for Fremantle.

1842 Sighted and exchanged calls and pleasantries with
USS COUC.L. (Ship Contract No. 25)

June 16, 1945 Noon Position - Lat. 25-115 Long. 112-22E
Enroute Fremantle.

1300 Hold battle problem - surface.

June 17, 1945 Noon Position - Lat. 29-553 Long. 113-27E
Enroute Fremantle.

1608 Made trim dive.

1518 Surface and continued on.

June 18, 1945 Noon Position - Fremantle, J.J.
Arrived Fremantle, 'Western Australia.

— page 224 —
1:0100 5/12:10-02N USS BRITAIN 8,000:030:30:J: Closed to con- 110-13: 14:verse.
2:0505 5/14:09-35T:Minelayer and 22,000:250:J:Torpedo Attack 101-44:reicher 25:No.1.
3:0000 5/15:09-30N:Minelayer and 18,500:280:J:Draw off es- 101-28:reicher 9:coort.
4:0343 5/15:09-16N USS HAMMARD 10,500:140:J:Closed to pick 101-41:up spares.
5:2237 5/16:07-00N USS BURMA 18,500:Var: 10:closed to con- 101-25:verse.
6:0037 5/18:10-23N Junk 5,800:300:J:Zvaded.
7:0333 5/18:10-10N Junk 5,500:2:J:Zvaded.
8:0525 5/19:08-34N USS HAMMARD 11,500:000:J:Closed to con- 102-25:verse.
9:0731 5/20:09-19N Fishing craft 6,000:no:Per:None.
10:0057 5/23:10-27N Junk 12,000:180:J:Opened to re- 99-28:main unobserved 102-49:12:J:Closed for in- 12:instructions.
11:0300 5/25:03-16N USS BURMA 9,500:320:J:Received mail.
12:0400 5/25:05-11N USS HAMMARD 12,000:var:J:Closed for in- 12:instructions.
13:2130 5/25:06-00N USS HAMMARD 9,500:345:J:Received conference 12:instructions.
14:2243 5/26:00-00N USS HAMMARD 12,000:var:J:Closed to con- 12:instructions.
15:1759 5/30:10-09N Junk 6,000:300:J:Per:gun Attack 99-12:no.1.
16:0700 5/31:06-04N USS HAMMARD 12,000:320:J:Closed for 100-55:var:J:Closed for 12:instructions.
17:0900 6/1:06-03N Junk 30,000:200:J:Dove.
18:1356 6/1:07-51N USS HAMMARD 20,000:315:J:Closed to re- 101-09:var:J:Closed for 12:instructions.
19:1552 6/1:08-05N Junk 30,000:150:J:Closed to in- 12:instructions.
20:1706 6/1:08-04N USS HAMMARD 2,000:Sub:Closed for 100-55:var:J:Closed for 12:instructions.
21:1940 6/2:07-50N USS HAMMARD 20,000:var:J:Closed for 12:instructions.
22:0510 6/6:06-20N 2: Tankers, 1 pr: 17,000:055:J:Torpedo attacks 105-20:oble Reicher 9:5:No.2,3,4,5.
23:0753 6/9:02-05N USS LIGHT 13,000:000:J:Per:None.
24:1342 6/9:01-30N USS HAMMARD 20,000:000:J:Closed to pick 12:instructions.
25:1542 6/15:21-005:USS COUNCIL 16,000:350:J:Closed for 12:instructions.
:114-303: 14:recon:

— page 227 —
U.S.S. COBIL - Fifth War Patrol - report of. (cont)
H -  ATTACK DATA
U.S.S. COBIL
Time: 0737
- continued -

| Tube | 1 | 3 | 4 | 5 | 6 |
|------|----|----|----|----|----|
| Track | 140-S | 144-S | 150-S | 156-S | 180 |
| Gyro | 052 | 061 | 058 | 059 | 074-3/4 |
| Depth | 4 | 4 | 4 | 4 | 4 |
| Power | High | High | High | High | High |
| Hit-Miss | Miss | Miss | Miss | Miss | Miss |
| Irratio | Broach | Broach or Broach | Broach | Broach | Broach |
| Mk. Torpedo | 14-3 | 14-3 | 14-3 | 14-3 | 14-3 |
| Serial | 66225 | 6302 | 23128 | 24590 | 40845 |
| Mk. Exploder | 6-5 | 6-5 | 6-5 | 6-5 | 6-5 |
| Serial | 27008 | 4982 | 26999 | 26840 | 13977 |
| Actuation | Contact | Contact | Contact | Contact | Contact |
| Actual Actuation | - | - | - | - | - |
| Mk. 'Harhead | 16-1 | 16-1 | 16-1 | 16-1 | 16-1 |
| Serial | 15099 | 19439 | 19446 | 19399 | 19423 |
| Explosive | Torpax-2 | Torpax-2 | Torpax-2 | Torpax-2 | Torpax-2 |
| Firing Interval | 0 | 8 | 10 | 14 | 37 |
| Type Spread | 0 | 3 | 3 | 6 | 0 |
| Sea Condition | Force 1 from south | Force 1 from south | Force 1 from south | Force 1 from south | Force 1 from south |
| Overhaul Activity | U.S.S. WORLD 'GILMORE | U.S.S. WORLD 'GILMORE | U.S.S. WORLD 'GILMORE | U.S.S. WORLD 'GILMORE | U.S.S. WORLD 'GILMORE |

Remarks:
Two torpedoes seen to broach continuously down range. Course adjusted between torpedoes Nos. 5 & 6.

- 26 -

— page 231 —
U.S.S. COEL - F/F War Patrol - report of.  (cont)

H - ATTACK DATA

U.S.S. COEL:  Torpedo Attack No. 3  Patrol No. FIVE
Time: 04:36  June 8, 1945  Let. 8-56N Long. 105-37E

- continued -

FIRST CONTROL AND TORPEDO DATA:

| Code | Data |
|------|------|
| 6    | 5

— page 232 —
5,000 ton (MU) length 430 feet by binoculars.

SIDES DIMENSIONS:
- Hull length: 24'
- Beam: 12'
- Draft: 12'
- Displacement: 6,000 tons
- Power: 350
- Speed: 9.5
- Range: 1,400 miles
- Crew: 12
- Armament: 3 x 5" guns, 1 x 3" gun, 1 x

— page 238 —
278, Encinos Nos. 1 and 2.
Water seal rings on the lower end of the cylinder lines of those encinos failed and water was found leaking into the lubo oil on both Nos. 1 and 2. This was a serious problem. The No. 1 and 2 encinos were not standard nooprene rings but were rubber rings of Australian manufacturer installed by U.S. JURY. All these rings should be replaced by standard rings if available.

General Motors Type 278, Encinos No. 1.
On May 13th, a crankcase explosion occurred in No. 1, in an engine just after load had been taken off the engine. Explosion plates were blown out so that the crankcase resulted. Air leaks and crankcases were cleaned and a process of shock and all units of this engine. All air was removed and all bearings on crankshaft and crankcase were cleaned. Air was removed from the crankcase and found normal. On May 15th, while running this engine with no load for check, a second explosion occurred, burning one and two bolts of fuel and rock. No damage to engine other than blown explosion plates. Engine occurred and was cleaned and checked.

High Pressure Air Compressor No. 2.
Injection of an abnormal number of stuck and scored valves in all stages showed that an excessive amount of Copalite had been used on hard racks and valves. Compressor was assembled and cleaned by ship's force and now operates normally.

Hydraulic Plant -
Ajustment of automatic by-pass valve is unstable and requires continuous adjustment.

ORDNANCE AND CURRENCY
Torpedo Detat Computer -
This automatic to shift targets after unsuccessful attack on May 14th, the anti-solva valve was found to be jammed. Investigation showed the operator was unable to contact point of the follow-up head was not making proper contact. Contact point was burned and airing. Ajusted by ship's force and is now apparently operating properly.

— page 239 —
1. U.S.S. COPL. - First Patrol - report of. (c)
K - MAJOR DEFECTS AND DAMAGE - continued -
ORDNANCE AND GUNTRY - continued -

Mark XVIII Torpedo Number 55932 -
The motor compartment of this torpedo was found flooded after being subjected to pressure at periscope depth on May 14th. Motor was disassembled, washed and baked until all grounds were roadied by ship's force. Motor was given test run with power from ship's battery and reinstalled. This torpedo was fired from surface on June 8th and sank at Waring point.

L - RADIO
Normal.

RADAR
SJ Radar - On May 14th, while on route to area, trouble was indicated in SJ by successive blowing of fuses on high voltage system, excessive plate current and eventual failure of power output. Damage was traced to faulty modulation network. Defective network replaced by ship's spare and operation was normal thrceaftor.

SD - Normal.
PR - Normal. - Idealistic feature in the SR system would be a switch in the cockpit antenna load in located near receiver so that operator could cut out antenna to check whether indications observed or originate inside or outside of ship.

N - SONAR GUN AND CONDITIONS
QB power stack - Hi-h voltage transformer on this stack was burned out during last patrol. Is no spares were available in Subic, an attempt was made to modify a spare radar transformer to replace it. This was partially successful and on

— page 240 —
0 - DENSITY LAYERS

Bathythorograph was operative one day in area. A 30
negative gradient was found at 80 foot on this day. Change
of trim experienced showed this gradient to exist throughout
patrol except during period from June 4-6 when overcast and
No. 4 sonar mixed water to bottom.

F - HEAVY, FOOD, AND HEALTH

A minor epidemic of colds and catarrhal fever continued
during training operations and persisted through the first two
weeks of the patrol. Otherwise health was excellent.

Habitability in the forward part of this ship was increased
nearly by the addition of an additional air conditioning
unit in the forward battery.

Food was nourishing and well prepared but variety was lacking.
Very few fresh vegetables or fruit juices were obtainable
at Subic and their lack was keenly felt.

Q - PERSONNEL

(a) Number of men detached after previous patrol......16
(b) Number of men on board during the patrol......71
(c) Number of men qualified at start of patrol......47
(d) Number of men qualified at end of patrol......59
(e) Number of unqualified men taken. first patrol......11

Quality of new personnel received continues to be high.

Our state of training at the beginning of this patrol was
below normal because of the transfer of many key men after four
runs. The short run from Subic to the area was not sufficient
to completely remedy this condition and it had its effect in
the attack on May 14th. However, the morale of all hands under

— page 241 —
1,290 miles. 12,500 gallons.
(b) In area. 6,152 miles. 48,770 gallons.
(c) Area to Frontal. 2,878 miles. 41,200 gallons.

S - DURATION
Days

— page 242 —
1. The Commander Submarine Squadron THIRTY.
To: The Commander-in-Chief, United States Fleet.
Via: (1) The Commander Submarines, SEVENTH FLEET.
(2) The Commander SEVENTH FLEET.

Subject: U.S.S. COBIA (SS245) - Report of Fifth War Patrol.

1. The fifth war patrol of the COBIA, conducted in the Gulf of Siam, was of forty days duration, twenty-seven of which were spent in the assigned area. The Commanding Officer of the COBIA was coordinator of attack group consisting at various times of the HAMMERHEAD, H.M.S. SUFFRAME, HAWKBILL, BULLHEAD, and HERGALL. Patrol was terminated due to expenditure of torpedoes.

2. Area coverage was excellent. Many contacts were made with junks; one which was flying Siamese colors was sunk by a well conducted gun attack on 30 May. There were two contacts on convoys with ships worthy of torpedo fire both of which were closed for attack. Of interest is the fact that no aircraft contacts were made at night.

3. TORPEDO ATTACK NO. 1: On 14 May a day periscope attack was made on a minesweeper escort for a m.c.t. AK; five steam torpedoes were fired on large track, with large gyros for no hits. This attack was ruined by a telephone talker mistaking an order for the assistant approach officer as an order to change the keel depth. This escort later, after an hours search, found the COBIA and subjected her to a severe depth charge attack. This attack forced the COBIA to bottom; put all torpedo tubes out of commission and caused a small fire in the maneuvering room when some foreign material fell into the control cubicle. After repairs were made the COBIA surfaced and later was able to draw off the escort and allow the HAMMERHEAD to sink the AK.

TORPEDO ATTACK NO. 2: On 8 June a night surface attack was made on a convoy consisting of two tankers and one unidentified escort. Four electric torpedoes were fired on 90° track, gyros 208, depth set 6 feet, torpedo run 3300 yards. No explosions were obtained. One torpedo was seen to broach and one did hit was heard.

TORPEDO ATTACK NO. 3: Torpedo Attack No. 3 followed immediately on the same convoy after a reload. Six steam torpedoes were fired on an 80° track, 2300 yards run, gyro zero, depth set 6 feet for two hits. The large tanker was seen to sink. Two torpedoes in this selvo were suspected to be erratic.

— page 243 —
5-30/AL6-4
Serial: 089
C-O-N-F-I-D-E-N-T-I-I-I-L
FIRST ENDORSEMENT to
U.S.S.S. COBIA (SS245)
Report of Fifth War Patrol
Subject: U.S.S. COBIA (SS245) - Report of Fifth War Patrol.

TORPEDO ATTACK NO. 4: This was another night surface attack immediately following attack No. 3 and was on the medium tanker. Three steam torpedoes were fired on an 80° track, gyros small, depth set 6 feet, torpedo run 1300 yards. All three torpedoes hit, the target exploded and sank.

TORPEDO ATTACK NO. 5 & 6: This was a night surface attack on the escort of the convoy sunk in attacks #3 and #4. Four electric torpedoes were fired on a 70° track, gyros small, depth set 6 feet, torpedo run 1200 yards. No hits were obtained. COBIA then fired her last electric torpedo with zero gyro, 1000 yard run, depth set 2 feet. This torpedo sank at the firing point and the COBIA abandoned the attack in order to get to diving water with dawn less than an hour away.

4. All torpedo attacks were executed in a determined and aggressive manner resulting in inflicting the maximum damage possible to the enemy. As would be expected, morale is high on this excellent fighting ship.

5. The COBIA returned from patrol in only fair material condition. It is expected that the existing defects can be corrected in the normal refit period. The Commanding Officer, officers and crew are heartily congratulated upon the completion of this excellent patrol and for the damage inflicted upon the enemy.

JESSE L. HILL,

— page 245 —
1 July 1945.
U.S.S. CONCORD (SS245) - Report of Fifth War Patrol.
Comment on:
4. The award of the Submarine Combat Insignia is authorized for this patrol.
5. The Force Commander congratulates the Commanding officer, officers and crew of the CONCORD on this fine performance during which the follow-ing damage was inflicted upon the enemy:
S-U-N-K
1 - SLIMSS JUNK * 100 Tons
1 - AD LTRS (EU) 10,000 Tons
1 - AC MEDIUM (EU) 5,000 Tons
Total 15,100 Tons

* Sunk by gunfire.

DISTINGUISH:
Com.1st 3) Direct CTD-71-B
Vice Onnav 2) Direct ComSubRon-22
Vice Onnav Cp-230 1) ComSubRon-26
Com1stFlt 1) DivComSubRon-30
Cor2ndFlt 1) DivComSubRon-22
Com7thFlt 1) DivComSubRon-26
ComSub1stFlt 1) DivComSubRon-30
ComSub2ndFlt 1) S/M School; N.L. Conn.
CPT-71 1) Condt: NYD, Puget Sound
CPT-71.5 1) SubAd, Hare Island
1) S/Ms 7thFlt

THIS REPORT WAS DESIGNATED PRIOR TO ENTRY INTO NAVY COMBAT WATERS.

J.B. MILLER,
Flag Secretary.

— page 246 —
23 JUL 1945
C-0-N-F-I-D-E-N-T-I-A-I
THIRD ENDORSEMENT to:
CO USS COBIA coef 1tr
Al6-3, serial 015,
dated 16 June 1945.

From: Commander Seventh Fleet.
To: Commander-In-Chief, United States Fleet.
Subject: U.S.S. COBIA (SS245) - Report of Fifth War Patrol - comment on.

1. Perverted.
2. The Commander Seventh Fleet notes with satisfaction this very successful and aggressive patrol, and sends a "Well Done" to the COBIA for sinking two valuable enemy tankers.

Copy to:
ComSubs7th
ComSubRon-30
CO USS COBIA (SS245)

T. C. KINKAID

— page 247 —
33245/116-3,
Serial (019)

c-DECLASSIFIED:
From: The Commanding Officer,
To: The Commander in Chief, UNITED STATES FLEET.

Via: Official channels.

Subject: U.S.S. COBIL (53245) - Report of War Patrol
Number SIX.

Enclosure: (1) Subject Report.
(2) Track Charts.

1. Enclosures (a) and (b) cover the SIXTH War Patrol of this vessel during the period July 18, 1945 to August 22, 1945, are forwarded herewith.

DECLASSIFIED-ART. 0445, OPM/WINST 5510.1C
BY OCP-09-02-02-0000

DECLASSIFIED

— page 248 —
U.S.S. COEIA - Sixth War Patrol - report of.

A - PROLOGUE

The COEIA arrived in Fremantle on 18 June 1945 after her fifth war patrol. The refit was conducted by the U.S.S. CLYDE and Submarine Division 301.

Major changes accomplished were the installation of: ST Radar, 5" gun forward in lieu of 4" gun, dummy log, D.R.T. in control room, twin 20mm forward, and directional A.P.R.

The refit was completed on 3 July at which time Commander A.L. BECKER, was relieved of command by Lieutenant Commander F.N. HUSSELL. There were no other changes in officer personnel.

Training period was conducted under Captain Jesse L. HULL during which three exercise and four special torpedoes were fired.

The original departure date was set back two days by one day in dock to renew both propellers (sound test showed them noisy) and reenact stern tubes and one day to replace unsatisfactory attack scope.

B - NARRATIVE

Officers and Chief Petty Officers aboard this patrol.

| OFFICERS | WAR PATROLS |
|||
| Lieut.-Comdr. F.N. RUSSELL, USNR. | 47 |
| Lieut.-Comdr. J.J. STILLEY, DE, USNR. | 55 |
| Lieut. J.P. MARION, Jr., USN. | 54 |
| Lt (jg); S.E. HINDERSON, Jr., DE, USNR. | 52 |
| Lt (jg); P.D. ROSENBERG, DE, USNR. | 42 |
| Lt (jg); B.D. LONGBELLO, ER, USNR. | 44 |
| Lt (jg); L.H. DAVIS, USN. | 42 |
| Lt (jg); D.C. FELTON, DE, USNR. | 42 |
| Lt (jg); E.L. BROWN, D(L), USNR. | 42 |

— page 249 —
1945

July 16, 1945

Underway from Fremantle, WA., to operating area to conduct gun shoot and convoy exercise.

July 19, 1945

0030
Night exercises completed and took departure for Subic Bay in accordance with Combat Group 71.1 Operation Order 96-45 dated July 17, 1945.

1200
Position: 30-05.5 S 112-44 E.
Battle surfaced and fired all small arms. Battle problem. Section dives.
Two engine speed.

July 20, 1945

1200
Position: 25-19.5 S 111-27.5 E.
Battle problem and battle surface. Section dives.
Two engine speed.

July 21, 1945

1200
Position: 20-33.2 S 112-39.8 E.
Battle problem and battle surface. Section dives.
Two engine speed.

— page 250 —
U.S.S. COBAL - Sixth War Patrol - report of. (continued)

July 22, 1945

1200 Position: 16-15.2 S 114-07.2 E
Battle problem.
Two engine speed.

July 23, 1945

1200 Position: 11-49.7S 115-13.8 E.
Three engine speed.

2300 APR Interference from radar station on southern
Bali.

July 24, 1945

0200 Sighted Blanbanga Peninsula, Java. Originally
intended to keep at least 15 miles off shore at
this point because of reported radar threat.

0330 No radar detected so closed coast to 7,000 yards
and made radar search of Garjacan Bay with negative
results. Low haze along coast.

Proceeding parallel to coast about 7 miles out
searching with ST radar with an occasional Sf sweep.

0435 APR Interference from two (2) shore based radars at
154 and 155 mcs. (See Radar Section for details).
Believe that we may have been detected.

0630 Changed course to 2400T to pass south of Barung
Island and to attempt to lose radar which was still
giving saturation pips.

0708 Made trim dive.

0740 Surfaecd. Three engine speed.

0874 Changed course.2900T to parallel coast.

0830 Radar still with us but growing weaker until at

1100- Lost radar interference.

— page 251 —
1945 (continued)
1112 Changed course 000T to close beach.
1139 Changed course 280T paralleling coast about 13-15 miles out.
1200 Position: 08-36 S 112-23.8 E.
1230 193 Mcs. radar interference sweeping - never steadied on us. About 11 miles off coast now.
1435 Sighted Zoke or Trojo at about 7 miles and submerged. We've been expecting him all day.
1531 Surfaced. Three engines.
1543 Divod. Sighted some zoomie about 6 miles distant.
1730 Surfaced. Three engines. 12 Miles off coast. Do not believe that anything the size of a large sailboat could have passed us unseen.
1922 Divod. Plane sighted at range of about 4 miles. They definitely have us.
2002 Surfaced. Three engines.
2025 In view of the following considerations decided to open out from coast to about 40-50 miles.
   (1) We have been detected.
   (2) There is no traffic along coast.
   (3) If we are not forced to dive too often, we can make Sunda Strait the morning of the 26th and thus save a day.
   (4) We are needlessly alerting the area which the TRUP and TIPTON will patrol.
2250 APR Contact at 106 MCS. Land based and sweeping. Looks like it is located in vicinity of Tjilatjap.

July 25, 1945
1200 Position: 06-24.0 S 107-04.5 E.
Running surfaced well off the coast. Three engines.
2010 Changed course to 3370T to head for Sunda Strait.

— page 252 —
U.S.S. COBIA - S.S. War Patrol - report of.  Continued.

July 26, 1945.

0740 Submerged off 3rd Point, Javh.
1200 Position: 06-25.7 S 105-36.9 E.
Sighted several sailboats close to Java coast.
2033 Surfaced.
0320 Increased speed to 16 and headed for Java Sea.
Sent COBIA's number one to CTF 71.

July 27, 1945.

0500 Passing west of Thwartway Island.
C790 SJ radar interference. Sweeping.
0719 Submerged with Thwartway Island bearing 220°T distance 40,000 yards.
Sunda Strait was very quiet. Only five praus were sighted all day and nothing at night. No signs of enemy activity were observed anywhere in the strait.
1200 Position: 05-30.5 S 106-12 E.
1616 Battle problem and drills.
1855 Sighted Two Brothers bearing 347°T.
2025 Surfaced on course 070°T.
2050 Picked up Northwatcher bearing 060°T, 30,000 yards.
2056 Changed course to 045°T.
2102 Avoided unseen radar contact at 2,000 yards range.
Tracked at 3 knots out to 4,000 yards and then lost.
Probably a sailboat. Weather is overcast and visibility poor.
2204 With Northwatcher abeam to starboard 5 miles,
changed course to 061°T. Three engine speed.

July 28, 1945.

0116 Making four engine speed.

— page 253 —
U.S.S. COBIA - Sixth War Patrol - report of. (continued).

July 28, 1945 (continued)

0139 Sighted and avoided small sailboat.

0725 Submerged for day.

1200 Position: 03-57 S 108-43 E.

2010 Surfaced.

2045 Discovery East Bank bearing 070°T, 18,500 yards.

2212 Changed course to 000°T heading for Karimata Strait.

July 29, 1945

0213 Karimata Island bearing 346°T, 87,000 yards.

0705 Avoided small sailboat.

0904 Trim dive.

0919 Surfaced.

1200 Position: 00-37.9 N 107-24.2 E.

1300 Sighted Pejantan Island.

1605 Sighted Pinang Seriboe.

1711 Sighted Tokong Kemocdi.

1910 Sent COBIA's number two saying we had missed serial E which we thought might concern us.

July 30, 1945

0747 Made trim dive.

0800 Surfaced.

0810 Sighted Great Natoena bearing 104°T, 50 miles.

1140 Sighted large bomber bearing 010°T, 15 miles. Disappeared on bearing 270°T. No I.F.F.

1200 Position: 04-59 N 107-28.8 E.

— page 254 —
1945 (continued)
July 30, 1945
Sighted plane at range of 12 miles. Tenetically identified as an A-20. Crossed stern and then presented zero angle on the bow. No I.F.F. or V.H.P.

1433 Submerged.

1537 Surfaced.

No answer to our number two yet. (Later discovered we had an answer but coding board could not break it.)

July 31, 1945
0220 Received Serial 84 directing us to search for downed Liberator in 8° N 105-25 E.

0239 Changed course to 2519T and headed west at full speed.

0713 Trim dive.

0726 Surfaced, four engines.

0800 160 Miles to go.

1200 Position: 07-11.2 N 106-21.2 E.

Received Serial 87 changing search to 08-30 N 102-17 E.

2120 Reported to BUGATA for search instructions. Instruccted to form scouting line at dawn.

August 1, 1945
0800 Formed scouting line and commenced searching area at two engine speed.

1200 Position: 08-12.4 N 103-24.8 E.

1511 Brice off search upon receiving Serial Easy.

— page 255 —
1945 (continued)
2145 Contacted COD and arranged rendezvous. (Learned that we had dropped the ball on Serial 73.)

August 2, 1945
0500 Rendezvoused with BOARDFISH and transferred personnel and all 5" and 40mm ammunition for further transfer of personnel to COD, ammunition to ELENNY.

0615 Headed for Subic Bay at three engine speed.

1015 SD contact at 4 miles. Dived.

1200 Position: 06-25,8 N 105-19 E.

1230 Surfeaced. Remained submerged two hours to work on hydraulic plant. Four engine speed.

1730 Slowed to three engine speed.

August 3, 1945
0707 Made trim dive.

0725 Surfeaced.

1200 Position: 09-50,0 N 110-22,2 E.

1344 SD contact at 7 miles closed rapidly to 5.

1346 Submerged.

1409 Surfeaced.

August 4, 1945
0647 Sighted B-24 which crossed a'ead at about one mile.

1200 Position: 13-46,0 N 115-01.0 E

1240 Sighted plane at 15 miles. Did not close.

— page 256 —
1945 (continued)
1454 Sighted plane at 20 miles. Did not close.
2052 Slowed to 13 knots to arrive at rendezvous at dawn.

August 5, 1945
0452 Exchanged signals via SW with DE 360. Our escort.
0645 Sighted Pt. Sampolac bearing 0879T.
1005 Moored starboard side to U.S.S. HOWARD W. GLIMORE, Subic Bay, P.I.

August 6, 1945
Tender adjusted automatic by-pass on hydraulic plant which has been unsatisfactory for a week. Received fuel and provisions. Also a good liberty and beer by courtesy of Captain Scott.
It. J.M. TURTS, DE, USNR reported on board for duty. Lt(jg) E.D. LOMPFELLOW, e(r), USNR was detached.
1400 Underway in accordance with modification to OPDr 96-45 to patrol southwest of Formosa and perform life guard duties.
1553 Submerged for A/S runs with escort DE 360.
1742 Surfaced and held radar tracking drill until 1900.
2035 Released escort.

August 7, 1945
0001 Changed course to 0009T.
0625 Made trim dive.
1200 Position: 17-08 N 116-19.8 E.
1325 Sighted Privater. Proper I.F.F. response.
1955 Changed course to 0150 heading for last reported position of FUSNER.

— page 257 —
1945

0603  Tim dive.
1145  Charged course 270°T so as not to close coast in daylight.
1200  Position: 21-30.2 N 119-50.5 E.
1245  Called RASHER. No answer.
1415  Called RASHER. No answer.
1429  Submerged for training. Fire control, emergency drills etc.
1935  Surfaced.
Reported our position to RASHER. Reported in to 8KC and asked if they had any dope for us.
Plan to remain north of line from Caran Bi tangent to Nyopii Tea. This should keep us shielded by land from the surface search radar on Caran Bi.
Closing coast on course 070°T. Intend to run along the coast and submerge there if no life guard dope is forth coming.
2355  Formosa bearing 001°T, 100,000 yards.

August 9, 1945

0234  Sound reports high speed screws bearing 049°T. No radar contact.
0235  Submerged. Ran silent until 0310 and searched with ST at depths of 60 to 35 feet. No contacts.
0310  Lost contact on bearing 320°T. JP now reports that contact may have been fish. I am convinced that it was.
0311  Surfaced and resumed patrolling about 7 miles off the coast.
0547  Submerged 2 miles off Taiheieho Kaku.
1200  Position: 21-59.6 N 120-39.6 E.

— page 258 —
U.S.S. CORIA - 8th War Patrol - report of (continued)

August 9, 1945 (continued)

1525 Sliched aircraft over Formosa. Looked like a transport.

1600 Fire control drill.

1715 Started opening coast so that we could copy 1930 - 2000 sled on SD mast.

2006 Surfaced. Course 2700T, speed 14.

2130 Changed course to 0950T and commenced closing coast.

2330 With the coast 6,000 yards ahead changed course to 0000T keeping from 9,500 to 5,000 yards off the beach.

August 10, 1945

0100 Changed course to 1800T when abeam of Fatokyaku.

Decided to spend today on the surface if no life guard info is received prior to dawn. Though that perhaps we were missing out while submerged.

0220 Changed course to 2700T.

0400 Changed course to 0900T.

0510 Changed course to 2700T.

0628 Made trim dive.

0649 Surfaced course 2700T, speed 14.

1200 Position: 21-51.8 N, 119-12.2 E.

1205 Changed course to 0900T.

1610 Submerged and held fire control drill.

1922 Surfaced. Creased ship.

2100 Closing coast to fix position. Plan to enter blind bombing zone and submerge at northern end of swept channel leading to Tkaco.

— page 259 —
U.S.S. COPEIA - 6th Wcr Patrol - report of (continued)

Au/ust 10, 1945 (continued)

Received some dope from our zootie friends saying that little offensive air activity was scheduled for the next two weeks. This "lits in with our plan to go north.

August 11, 1945

0543 Submerged at what we figured was entrance to swept channel.

1200 Position: 22-49.5 N 119-58.8 E.

1805 Sighted buoy which from our questionable position appeared to mark the entrance to the swept channel.

2015 Surfaced. Takao is lithed up like a Christmas tree. About six searchlights are sweeping the sky.

2115 Headed north to fix our position on the Pesacadores Islands

2245 Picked up Tokitsu Sho bearing 3500T range 26,000 yards.

2306 Contact bearing 0590T range 6,200 yards. Target tracked at 9 knots on course 3000T. Went to battle stations, made ready tubes, and commenced closing in an attempt to identify contact. At 4,000 yards target was barely visible. About this time target presented 170° angle on the bow. Decided it was a small patrol boat patrolling strait.

2346 Turned away and headed for diving point at end of swept channel. Secured from battle stations. Lost target at 10,000 yards. Avoided contact at 2,700 yards, bearing 190T. Not seen or heard. Lost at 4,000 yards.

August 12, 1945

0200 Changed course to 2700T to open coast. Radar at 157 mos located in vicinity of Tainan is giving us a steady strength five signal.

0340 Received dope on strike today. All ahead flank. We can reach station if all goes well and have an hour's leeway.

— page 260 —
12, 1945 (continued)

0930 Submerged on station.

1050 Surfaced and commenced steering 3 mile square on station.

Sighted air cover. Established VHF communication. Cover airlock once, zoomed us once, and then took station about 6 miles south of us.

1200 Position: 21-27 N 126-18.7 E

1230 Air cover said he was going home. Only one plane left over target and he should pass to the east or us shortly.

1330 Plane says he is searching 35 miles north of us for "blimp or sea-gull" sighted during strike.

Changed course to 0000T.

1355 Sighted Libertator and Catalina heading home. Search completed.

1400 Changed course to 2300T.

1600 Changed to 0550T to close coast.

Patrolling off southern entrance to SWP channel. Plan to remain here until 0430 and then proceed into blind bombing zone and patrol northern entrance to SWP channel.

August 13, 1945

0335 Received life guard station assigned for today's raid on Tianan. Considering there was no offensive activity scheduled for two weeks we're right busy.

0625 Submerged on station.

1055 Surfaced.

1105 Contacted air cover on VHF.

1200 Position: 21-55 F 120-16 E

1230 Air cover reports he is over us but cannot see us. His position: 4 miles inland.

— page 261 —
13. August 1945 (continued)
Someone should explain the limitations of submarines.
1315 Air cover reports all planes accounted for and that he is heading home. Communications were good.
1330 Patrolling on surface 30 miles off shore.
1900 Changed course to 0900 to close the coast.
2200 Closed Ryokyu Sho to 7,000 yards and commenced working northward to patrol across swept channel.

August 14, 1945
0030 Patrolling across southern swept channel entrance.
0430 'Stoated on course 3500' heading for day's submerged patrol at northern end of channel.
0600 Submerged at channel entrance.
1200 Position: 22-56° 11' 58.2" E.
1955 Heard three explosions on the south side of the submarine, striking water. Periscope housed, 60 feet, at the time.
2015 Surface.
2020 SJ contact 5,000 yards closing. SD contact 2 miles. Lookout sighted plane with small angle on the bow. Submerged.
2045 Heard distant explosion.
2050 Surface. Heading south to clear blind bombing zone. Japan has accepted the terms offered for (unofficially).

August 15, 1945
0130 Scoured patrol line channel entrance set course for Ryokyu Sho. Plan to patrol surfaced tomorrow off south coast in order not to miss any dope.
0300 Passing south of Ryokyu Sho on course 1050 to close coast.

— page 262 —
15 - August 15, 1945 (continued)
0420 Running south along coast about 4 miles off shore.
0518 Changed course to 260°T to open coast.
1200 Position: 22-02.5 N 120-00 E.
Received serial 43 modifying our Opor. We are to join ICERISH, CROAKER, and RLY.
1740 Set course 120°T speed 10 to head for rendezvous.

August 16, 1945
0445 Sighted Itabayat Island bearing 120°T, 20 miles.
0620 Trim dive.
1100 Fired twenty rounds of 5" at small rock near Diogo Island. We are milling around waiting for other boats to come along.
1123 Submerged.
1200 Position: 20-44 N 122-21.6 E.
Sighted several large aircraft during morning. None close.
1500 Surfaced. Sighted RLY and CROAKER.
1615 Joined up with RLY and CROAKER. Course 0900T, speed 17 knots.
1900 Changed to Op control of ConsubPac.
1955 Received ConsubPac 160711 and reversed course in compliance therewith to proceed west of 122°E and thence to Area Niche.

— page 263 —
17, 1945
0030    Changed course to 090° in company with RY and CRACKER.
1200    Position: 23-06.1 N 121-55.3 E.

: 18, 1945
Underway as before in area Nicao.
1000    TICK joined up.
1200    Position: 23-13.8 N 125-29.3 E.
1500    ICEFISH Joined up.

: 19, 1945
Enroute Saipan as before.
1200    Position: 19-55.5 N 130-07.2 E.

: 20, 1945
Enroute Saipan as before.
1200    Position: 16-54.9 N 135-53.2 E.

: 21, 1945
Enroute Saipan as before.
0100    Changed time to KING (-10).
1200    Position: 14-16.2 N 141-10.2 E.

: 22, 1945.
Arrived Saipan.

— page 264 —
U.S.S. COSTA - S.S. War Patrol - report of.  :  continued).

C -  :  CHAPTER

Weather conditions were in accordance with those shown on pilot charts and sailing directions.

D -  :  TIDAL INFORMATION

Currents encountered were closely related to the direction of the monsoon.  Sunda Strait, July 26th, a current of 1.5 knots setting 325T,  Karimata Strait, July 28th, a current of 0.5 knots setting 340T.

:  Currents off Formosa were as indicated in Sailing Directions.  However, within ten miles of the coast counter currents of 0.5 to 0.9 knots setting parallel to the coastline were encountered.

E -  :  NAVIGATIONAL AIDES.

Off Takao a red can buoy in position 22-48.5N, 119-56E was observed.  This appears to mark the end of an authorized navigational channel into end out of the minefields.

F -  :  SHIP CONTACTS.

None.

— page 266 —
7-103/11-3
Serial: 062
CERTIFICATE
FIRST ENTRANCE BY:
U.S.S. CULM (33845)
Report of Sixth War Patrol.

From: The Commander Submarine Division OF HURRIED THREAT.
To: The Commander in Chief, United States Fleet.
Via: 1. The Commander Submarine Squadron THR.
       (1) The Commander Submarine Force, Pacific Fleet,
          Administration.
       (2) The Commander in Chief, U.S. Pacific Fleet.

Subject: U.S.S. COBRA (33845) - Report of Sixth War Patrol.

1. The sixth war patrol of the U.S.S. COBRA was the first for Lieutenant Commander F.N. Russell as commanding officer.

2. This patrol was broken up by enemy destroyers at 0342 hours, after which the COBRA patrolled southwest of Formosa performing lifesaving duties.

3. The patrol was of thirty-five days duration of which eight days were spent in the area. No opportunity to resume aviation personnel afforded itself, and no contacts worthy of torpedoes were made.

4. The Administrative Division Commander concentrates the commanding officer, officers and crew of the U.S.S. COBRA on the return from their last war patrol.

Wm. H. BROOMAN, Jr.

— page 268 —
10 7609
Care of Fleet Post Office,
San Francisco, Calif.
15 September 1942.

NOTES:
THIS REPORT WILL BE
DISTRIBUTED PRIOR TO
MAKING PACIFIC AREA.

SUBMASTER PAGE, PACIFIC FLEET
Serial 02308
CONFIDENTIAL

SHIP REPORT TO:
COELA Report of
Sixth War Patrol.

CONSUSPAC PATROL REPORT NO. 899
U.S.S. COELA - SIXTH WAR PATROL.

From: The Commander Submarine Force, Pacific Fleet.
To: The Commander in Chief, United States Fleet.
Via: The Commander in Chief, U.S. Pacific Fleet.

Subject: U.S.S. COELA (SS245) - Report of Sixth War Patrol
(18 July to 22 August 1945).

1. The sixth war patrol of the COELA, under the command of Lieutenant Commander F. H. Russell, U.S. Navy, was devoted to life aboard duties. Except for two days of searching for aviators off the entrance to the Gulf of San Miguel on route to her area, this patrol was conducted off the southwest coast of Formosa.

2. No opportunities were afforded to rescue any air force personnel or to inflict damage upon the enemy.

3. Award of Submarine Combat Unit insignia for this patrol is not authorized.

4. The Force Commander congratulates the commanding officer, officers, and crew of the COELA for the completion of this patrol and welcomes them to the Control Pacific.

DISTRIBUTION:
(Continued from previous page)

CONSULANT:
(Continued from previous