U.S.S. GATO (SS-212) — war patrol report SS-212_GATO_Part1.pdf

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35-12N
: 125-45E
: USS (SS-282)
: World War II
: Patrol File
: Action Reports

All Material On This Deck Is Declassified

For Deck Log Descriptions, WWII-June 1945 Consul
National Archives, which has custody

J.M. KOMTZ

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7
USS GATO (SS-212)

After refit at Dutch Harbor, GATO departed 4 September 1942 on her third war patrol. From 6 to 9 September, she took up patrol southwest and east of Amagasaki Island. On 11 September she commenced patrol off Kiska Island, continuing until 22 September 1942, when course was set for Midway Island, arriving 28 September. On 2 October 1942, GATO arrived in Pearl Harbor and on this day Lieutenant Commander W. G. Myers was relieved of command by Lieutenant Commander R. J. Foley, USN. After refit which included installation of 20mm mounts, GATO departed Pearl Harbor 2 November 1942.

While off Truk on 6 December 1942, a convoy of two freighters and three destroyers under air escort was sighted. GATO commenced an approach despite unfavourable sea conditions. As the periscope started up for a final firing bearing check, an aircraft depth bomb exploded fairly close to GATO. Lieutenant Commander Foley continued raising periscope but just before it broke surface, the handles were practically wrenched out of his hands by the force of three more explosions believed to have been aerial bombs. Without final bearing, four torpedoes were fired and an explosion was heard. Evaluation of the attack could not be made by observation as the destroyers kept GATO down in a four-hour depth charge attack before she was finally able to elude her attackers during a rain squall. GATO returned to Brisbane, Australia, 23 December 1942.

GATO departed Brisbane, 13 January 1943, to conduct her fourth war patrol in the New Georgia Group of the Solomons Islands. On 21 January, she sank transport KENKON MARU, 4,575 tons (6-12'18; 1550-51'1"). Four days later, she scored two hits on an enemy warship, probably a cruiser, but was unable to observe results because of enemy counter-measures. On 29 January she sank cargo NICHIMAR MARU, 2,723 tons (6-21'18; 1560-04'1"). On 15 February 1943, she sank cargo SURUGA MARU, 991 tons (6-27'18; 1560-04'1"). The target was observed to be settling by the storm, however, GATO was forced down by depth charge attack and a sinking could not be confirmed. She returned to Brisbane on 26 February 1943.

GATO departed Brisbane, 19 March 1943 to conduct her fifth war patrol in the Solomons with the additional special mission: to land an Australian Intelligence party led by Lieutenant Keenan, Australian Naval Reserve, at Toep, Bougainville, Solomons Islands, with supplies and to evacuate from this same location, a party of twelve Australian Intelligence Force Comanndos and twelve civilians.

On 29 March 1943, GATO arrived and stood into channel while Lieutenant Maclean, in a rubber boat went ashore to reconnoiter. In a native canoe, Lieutenant Read, Royal Australian Naval Reserve, came aboard to report that he had assembled a group consisting of 27 children, nine mothers, three nuns and twelve Australian Intelligence Force Commandos. He requested that GATO take aboard as many as possible. Lieutenant Commander Foley determined that he could take all and using native canoes in addition to rubber boats, simultaneously embarked the group with the landing of the twelve commandos and their supplies. The mothers were at first distraught then truculent while the nuns were benign and patient. The commandos volunteered for dirty jobs and inquired whether there was any beer in Brisbane. GATO's crew adopted the children and became clumsy but enthusiastic nursemaids. A typical example was a 10-month old child who would sleep nowhere but in the arms of a bearded torpedoman who manned the telephone at the forward torpedo tubes. On the night

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31 March, off Rumos, Florida Islands, the evacuees were transferred to SC-531 and GATO returned to patrol off Bougainville.

On 4 April 1943, while on submerged patrol between Tanga and Lihir Islands, GATO commenced approach for a submerged radar attack on a large vessel, with escort attern. At this time, the escort turned for GATO causing her to crash dive for deeper water. The first of three depth charges detonated as 150 feet was passed. The shock was violent that GATO seemed to jump an appreciable distance. She managed to escape but was compelled to return to Brisbane for temporary repairs, arriving 11 April and departing to resume patrol on 20 April 1943.

On 28 April, GATO arrived off Teop Parrot, East coast of Bougainville. About twenty white tants were observed on the mountainside and on 29 April, Lieutenant Beverly, volunteer, proceeded in to the beacon in a rubber boat, to reconnoiter and expedite the embarkation of evacuees. This was done concurrent with the landing of commends and freight. On 1 May 1943, at Ramos, Florida Islands, passengers were transferred to SC-504 and Lieutenant Commander Foley passed advance information on Bougainville for delivery to Task Force 72. He also delivered a letter from Coast Matcher Feenan to his superiors at Lunga. GATO returned for patrol and reconnaissance near several islands, among them Tarawa, before returning to Pearl Harbor on 6 June 1943.

On 14 June 1943 GATO arrived Mare Island Naval Shipyard for major overhaul. She departed Mare Island on 15 August 1943, arriving in Pearl Harbor 22 August 1943, then conducting a brief period of refresher training.

GATO departed Pearl Harbor, 6 September 1943, to conduct her sixth war patrol in the waters off Bougainville and Truk. On 19 October she intercepted a convoy of two cargo ships under escort of a destroyer and scored hits on the cargo ships of estimated 8,500 and 7,000 tons respectively, for unconfirmed damage. She terminated this patrol in Brisbane on 28 October 1943.

GATO departed Brisbane, 18 November 1943, on her seventh war patrol. Fueling at Tulagi in the Solomons, she sped to the area north of the Bismarck Archipelago, and on 29 November exchanged calls and information with RAY, agreeing on a search plan for attack on a south bound convoy being trailed by RATON. First contact was made in early afternoon of 29 November when GATO fired three torpedoes for no hits on one of three cargo ships under escort of three destroyers. GATO was severely depth charged by the escorts until RATON purposely closed the escorts on the surface, drawing her attackers away. GATO chased the convoy during the night and on 30 November sank passenger-cargo COLUMBIA MATU, 5,618 ton (15-56N; 1470-23E). Again severely depth charged and driven down to 400 feet, she eluded her enemies and searched further for the convoy on 1 December 1943, but contact was not regained.

On 8 December 1943, she intercepted two cargo ships with two escorts firing six torpedoes. Two lined hits were heard and one ship was seen spinning to the right and had covered about 150 degrees when last seen. Escorts promptly counter-attacked with eleven depth charges but GATO escaped without damage. On 9 December she was forced to abandon chase to refuel at Tulagi on 13 December 1943.

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1944, arrived off Chichi Jima to commence lifeguard patrol. Here she had a ringside seat in observing carrier-based air strikes on that island during 4 and 5 August 1944. During these air strikes, she rescued two aviators from the sea. She departed her lifeguard station on 23 August and after a stop for fuel at Midway, arrived in Pearl Harbor on 2 September 1944.

Prior to the eleventh war patrol, GATO underwent major overhaul in the Mare Island Navy Yard and conducted sound training exercises out of San Diego before returning to Pearl Harbor.

She departed Pearl Harbor, 28 January 1945, forming a coordinated attack group with JALTAO (SS-368) and SUNFISH (SS-261), to conduct her eleventh war patrol in the Yellow Sea. On 14 February 1945, she sank a frigate, COAST DEFENSE VESSEL No. 9, estimated 800 tons (34°N; 132°-58'E). During a surface attack 21 February 1945, she sank cargo TATIKKU MARU, 2,325 tons (35°-24'N; 125°-23'E). GATO returned to Guam on 13 March.

Commander Richard M. Farrell, USN, was relieved of command on 29 March 1945 by Lieutenant Commander Richard Holden, USN. Commander Farrell, for services as commanding officer of GATO during her tenth war patrol, received a Letter of Commendation with authorization to wear the Commendation Ribbon. He was also awarded a Gold Star in lieu of a Third Silver Star Medal for conspicuous gallantry and intrepidity as commanding officer of GATO during her eleventh war patrol.

GATO departed Guam, 12 April 1945, to conduct her twelfth war patrol on lifeguard station in support of the invasion of Okinawa. On the night of 22-23 April, she had a brief contest with two Japanese submarines and narrowly missed destruction as well-asimed torpedoes came close. Between 27 and 30 April 1945, she rescued ten U. S. Army aviators from shallow water near the beaches of Toi Misaki, Kyushu Island. GATO returned to Pearl Harbor on 3 June 1945.

GATO departed Pearl Harbor, 8 July 1945, on her thirteenth war patrol. She was on lifeguard station off Wake, 17-18 July 1945, in support of air strikes on that island. She then took up patrol station off the eastern coast of Honshu and from 9 to 11 August 1945, was on lifeguard station in support of air strikes on Okinawa. On 15 August, while off Shiriya Sak, GATO received word of "cease fire" as she was making an approach on a large Japanese Sea Truck. She steamed into Tokyo Bay on 31 August, remaining to witness the historic surrender of Japan with the signing of documents aboard MESCUROI on 2 September 1945. GATO departed Tokyo Bay, 3 September for Pearl Harbor, arriving 12 September 1945.

GATO then steamed to the New York Naval Shipyard where she was placed out of commission on 16 March 1946. Commander Richard Holden was awarded the Bronze Star for his service during GATO's twelfth war patrol, and; a letter of commendation with ribbon and combat V device for service during her thirteenth war patrol.

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1. 1st/MAIDWAY - 3 to 6 June 1942
1. 1st/CAPTURE AND DEFENSE OF GUADALCANAL - 13 Jan to 8 Feb 1943
1. 1st/ASLATIC-PACIFIC RAIDS - 1944
   - Truk, Estavans, Pompeo Raid 16-17 Feb 1944
1. 1st/MARIANAS OPERATION
   - Fourth Bonins Raid - 4 to 5 August 1944
1. 1st/WEETERN CAROLINE ISLANDS OPERATION
   - Raids on Volcano Bonin Islands and Yap Island - 31 Aug to 8 Sept 1944
1. 1st/IWO JIMA OPERATION
   - Assault and Occupation of Iwo Jima - 15 Feb to 7 Mar 1945
1. 1st/OKINAWA GUNTO OPERATION
   - Assault and Occupation of Okinawa Gunto - 18 Apr to 18 May 1945
1. 1st/THUMPER FIELD RAIDS
   - Pacific - 2 Jul to 20 Aug 1945
1. 1st/SUBMARINE WAR PATROL - Pacific - 2 Jul to 20 Aug 1945
1. 1st/SUBMARINE WAR PATROL - Pacific - 6 Sep to 20 Oct 1945
1. 1st/SUBMARINE WAR PATROL - Pacific - 6 Sep to 20 Oct 1945
1. 1st/SUBMARINE WAR PATROL - Pacific - 18 Nov 1945 to 10 Jan 1946
1. 1st/SUBMARINE WAR PATROL - Pacific - 30 Apr to 22 June 1946

NAVY OCCUPATION SERVICE MEDAL (ASIA) - 2 to 3 Sept 1945
PRESIDENTIAL UNIT CITATION:
13 Jan to 26 Feb 1945 - Fourth War Patrol, Pacific
19 Mar to 11 Apr 1945 and 20 Apr to 6 June 1945 - Fifth War Patrol Pacific

6. 6 Feb to 28 Oct 1945 - Sixth War Patrol - Pacific
18 Nov 1945 to 10 Jan 1946 - Seventh War Patrol - Pacific
2 Feb to 1 Apr 1946 - Eighth War Patrol - Pacific

STATISTICS

OVERALL LENGTH: 31 ft, 9 inches
BEAM: 27 ft, 3 inches
DRAFT: 19 ft, 3 inches
DESIGN SPEED: 20.25 knots
    Submerged: 8.75 knots
DISPLEMENT: 1526 tons
    Submerged: 2424 tons
COMPLEMENT: 6 officers; 54 enlisted
ORIGINAL ARMAMENT: Twenty-four torpedoes
    Ten 21" torpedo tubes
    One 3" .50 caliber
    Two .50 cal. machine guns
    Two .30 cal. machine guns

RECOMMENDED AND STENCILED NOV 1957
-6-

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1. Narrative.

0921 (V-W) 20 April 1942 to 1715 (1d) - 26 April 1942.

0921 (V-1) Departed Pearl under escort until 2030 (VW) - 20 April, 1942. Amrots to Area conducting training exercises. Fired 10 rounds 3" 50 caliber (training ammunition) and 50 rounds .50 caliber.

1045(X) April 22, 1942, sighted U.S. Navy PBY (Par. 6 - No.1).

26 April 1942 Submerged until evening twilight due to partial overcast of low hanging clouds rendering early detection of aircraft impossible and distance to Wotje (300 miles) making air contact very likely, although no enemy planes have been contacted, visual or Radar, up to this time. Also, desire to arrive off Kwajalein atoll unobserved. Radar contact with plane 4 miles which was lost at 6 miles (Par. 6 - No. 2).

27 April 1942 Began submerged patrol during daylight. Radar (Par. 6 No. 3) with plane at 2 miles which was lost at 4 miles.

28 April 1942 Entered area and set course for MOI ISLAND of KAIJALEIN ATOLL following instructions contained in ComTaskFor 7 despatch 261916 to remain north of latitude 99° N until after 3 May, 1942.

29 April 1942 Sighted diesel trawler (Par. 5 No. 1). No indication of A/S measures taken by trawler. Made landfall. Patrolled off north reef to west of BIGI ISLAND.

30 April 1942 Conducted submerged patrol north and west of KAIJALEIN ISLAND. Sighted small (150') auxiliary vessel (Par. 5 No. 2).

1513 (L)

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1 May 1942
: 0951(L)
: 1032(L)
: 2 May 1942
: 3 May 1942
: 1315(L)
: 4 May 1942
: 1349(L)

CONFIDENTIAL
Subject: U.S.S. GATO - Report of First War Patrol.

Conducted submerged patrol off ISLAND and NORTH PASSAGES, sighted one patrol type plane, circling over ISLAND (Par. 6 No. 4), and two "Catcher Type" patrol vessels on various courses patrolling off NORTH PASSAGES (Par. 5, 10, 3). Sighted freighter of 7,000 tons standing up from south part of lagoon (Par. 5, 10, 4). Vessel later changed course to North and anchored in lagoon south of RUI ISLAND, attempted from 1230 (L) to 1440(L) to get inside of patrol line off RUI ISLAND but had to stand to westward to keep clear of patrol vessels.

Conducted submerged patrol off ISLAND and NORTH PASSAGES, Patrol vessels standing at 3 miles from shore, which forced some of patrol vessels to change course of 1,000 miles to the south.

Sighted "Catcher Type" patrol vessel (Par. 5, 10, 5). Brilliant moonlight and almost daylight so submerged. Conducted submerged patrol off ISLAND and NORTH PASSAGES. During morning passed through patrol line and obtained good view of anchorage south of RUI ISLAND. Freighter (Par. 5, 10, 6) anchored south of RUI ISLAND, patrolled 3 - 4 miles off entrance to PASSAGES on line north to reported approach course of ISLAND. Patrol vessels and planes continue activity. Sighted KASUGA (CV) (Par. 5, 10, 7) with 2 DD's for antisubmarine screen. Assumed attack course and at 1322(L) fired 5 torpedoes, (Attack No. 1). DD's and two patrol vessels started searching, using supersonic gear with heard pinging on 22 kcs. DD's evidently using sonic gear and steamed at 20 cpm. Went to deep submergence (255') with "cat" running, making off to the North. DD's approached enemy boat 1347(L) and out of contact with patrol vessels by 1530(L). Took station 4 miles east of RUI to examine anchorage. Could not see KASUGA nor DD escort. Stood to the NE and reported to CTF? attack on KASUGA with two probable hits (GATO consecutive No. 1).

Sighted plane (Par. 6, 10, 7).

-3- ENCLOSURE (A)

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1350(L) Sighted 2 DD, KASUGAI (apparently undamaged, 5 cargo vessels (3-7,000 tons) anchored to east of MELLU ISLAND and NORTH PASS (Par. 5, No. 8). Sighted DD bearing 0850T, 2 miles, course 2450T. Depth charge dropped on starboard quarter, followed by seven more at about one minute intervals. Took deep submergence and silent running and made off to the North. Lost contact with DD and patrol vessel. Sent CTF 7 data regarding ships in ROI anchorage and 3 hangars or storehouses on west side of ROI ISLAND (GATV consecutive No. 2).

5 May 1942 Patrols submerged east and northeast of ROI ISLAND. Observed land plane, (Par. 6 No. 9). 1140(L) Observed 2 DD and 3 cargo vessels anchored in east part of ROI anchorage (-ar. 5, No. 10). Sighted fishing ship, (Par. 5 No. 11). During darkness changed position to be off BIEGI CHANNEL at daylight to obtain data for patrol on 7 May as result of CTF 7 dispatch regarding entry of important unit on that date.

6 May 1942 Patrols submerged off BIEGI CHANNEL to north of KATALBEN ISLAND. Sighted sampan standing out BIEGI CHANNEL (Par. 5, No. 12). Observed five cargo vessels (2 - 7000 tons), and one frigate-passenger vessel (7,000 tons) at anchor in lagoon north of KATALBEN ISLAND.

7 May 1942 Patrolling off BIEGI CHANNEL as recommended by CONSULTANT for entry of important unit. 0532(L) Sighted patrol vessel (Par. 5, No. 13) similar to Hudson type ship. Observed anchorage north of KATALBEN ISLAND - i.e., KATALBEN, 1 passenger-frigider type (7,000 tons), 2 cargo vessel (7,000 tons), 4 cargo and three 2 - 5000 tons) (Par. 5, No. 14). 1344(L) Sighted sampan or small patrol boat (Par. 5, No. 15) off south channel.

8 May 1942 Patrolless east, north and west of ROI ISLAND. 0900(L) Sighted airplane (Par. 6, No. 9). 1005(L) Aerial NAV vessel stood up from south and anchored south of ROI ISLAND (Par. 5, No. 16).

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1228(L) Sighted "Catcher Type" patrol vessel on station N of ROI (Par. 5, No. 17). Very active patrol until vessel stood south at 1527(L). Followed on SE course.

1648(L) ASAIA MAIU vessel sighted (Par. 5, No. 18) standing out. Started approach but unable to close range under 6000 yards after half hour chase at 1 hour rate. Target making 104 r.p.m. (10 kts). Astern of patrol vessel on course 302°T with air-plane A/S screen (Par. 6, No. 10).

1759(L) Target out of sight. Speed 10 knots checked throughout time target in sight. Surfaced and started pursuit on course 302°T. Pursuit made as at 10 knots vessel could easily be intercepted during night.

9 May 1942 Passed through target 12.5 knot position 10 miles north of NOTHO ATL. Changed course to intercept 10 knot position of target on course 290°T. Conducted patrol in course 100°.

0519(L) Conducted patrol off southwest side of KIAJALEN ATL. No patrol activity off any of the passes.

11 May 1942 Patrolled off GAA PASS. Sighted patrol vessel (Par. 5, No. 19). Active patrol on N/W - SE line about 5 miles out from coast line across entrance to GAA PASS.

12 May 1942 Patrolled off GEA PASS. Sighted patrol vessel (Par. 5, No. 20). Patrol vessel very active. In sight intermittently during entire day.

13 May 1942 Patrolled off GEA PASS. Sighted patrol vessel (Par. 5, No. 21). Continued patrol off GEA PASS and to S7 of PASS maintained by patrol vessel.

1348(L) Sighted tanker (Par. 5, No. 22). Corroded and made attack No. 2 off entrance to GEA PASS. Sighted patrol vessel (Par. 5, No. 23). Went to deep submergence and silent running. Lost sound contact with patrol vessel at 1023(L).

14 - 16 Patrolled in North-South line west of ROI ISLAND covering approaches to NORTH PASS.

May, 1942

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17 May 1942
: 0742(L)
: 18 May 1942
: 0941(L)
: 19 May, 1942
: 1021(L)
: 1907(L)
: 20 May, 1942
: 0900(L)
: 1002(L)
: 21 May, 1942
: 0737(L)
: 22 May, 1942
: 0929(L)
: 23 May, 1942
: 0554(L)
: 0708(L)
: 1116(L)
: 24 May, 1942
: 1006(L)

: PATROLLED OF NORTH PASS.
: SIGHTED patrol vessel (Per. 5, No. 27).
: Two vessels anchored in NORTH anchorage (Par. 5, No. 28).
: SURFACED about 9 miles north of ROT ISLAND.
: Landing field flooded and red lights burning on radio and lookout towers. No planes landing or taking off could be seen. Lights turned off at 1930.

: PATROLLED off NORTH PASS.
: SIGHTED patrol vessel (Par. 5, No. 29).
: SIGHTED airplane (Par. 6, No. 11). Same vessels at anchor.

: PATROLLED off NORTH PASS.
: SIGHTED patrol vessel (Par. 5, No. 30).
: Same vessels at anchor.

: PATROLLED off NORTH PASS.
: SIGHTED small tanker (Par. 5, No. 31). Heavy rain squall reduced visibility to the extent that no attack could be made. Could not pick up target on sound gear. Tanker next seen about 4500 yards distance, entering NORTH PASS.
: SIGHTED two airplanes (Par. 6, No. 13).
: SIGHTED patrol vessel (Par. 5, No. 32).
: Same vessels at anchor.

: PATROLLED off NORTH PASS.
: Same vessels at anchor.
: SIGHTED patrol craft (Par. 5, No. 33).

: ENCLOSURE (A)

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25 May, 1942
0011(L) - Changed course to take station off MIDAY as directed by ComSubPac.

: 26 May, 1942
1413(L) - Enroute MIDAY patrol station. Sighted airplane (Par. 6, No. 14). Radar contact which led to plane being sighted. Submerged until 1531(L).

: 27 May, 1942(L) to 28 May, 1942(Y)
1412(Y) - Enroute MIDAY patrol station. Sighted airplane (Par. 6, No. 14).

: 29 May, 1942
0352(Y) - Arrived on patrol station west of MIDAY.

: 30 May, 1942
1517(Y) - Sighted airplane (Par. 6, No. 15).

: 31 May, 1942
0042(Y) - Set course for MIDAY to obtain fuel in accordance with ComTaskFor 7 instructions. Sighted three airplanes (Par. 6, No. 16). UREL ISLAND bore 0000Y, 5 miles. Secured at pier, MIDAY and commenced fueling.

: 1 June, 1942
0519(Y) - Underway from MIDAY enroute to patrol station. Arrived on station, sighting numerous BFY's and B-17's patrolling out of MIDAY while enroute.

: 2 June, 1942
0607(Y) - Patrolling in assigned sector on 200 mile circle west of MIDAY. Sighted airplane (Par. 6, No. 17).

: 3 June, 1942
0552(Y) - Patrolling in assigned sector on 200 mile circle west of MIDAY. Sighted airplane (Par. 6, No. 18). Sighted airplane (Par. 6, No. 19).

: 4 June, 1942
0745(Y) - Patrolling in assigned sector on 200 mile circle west of MIDAY. Surfaced and proceed at full power on course 0800T to close enemy forces located northwest of MIDAY as directed by ComSubPac. Radar contact airplane distance 12 miles.

: 0935(Y)

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1500(Y) Changed course to 3200T. No further reports of reports of enemy forces received and considered not contacts likely west of MIDWAY. 1546(Y) Sighted airplane (Par. 6, No. 20). By flashing light obtained information from this plane that enemy forces bore 3380T from MIDWAY. 1555(Y) Sighted airplane (Par. 6, No. 21). 1620(Y) Sighted airplane (Par. 6, No. 22). 1720(Y) Changed course to 1600T and proceeded to station in sector on 100 mile circle west of MIDWAY.

5 June, 1942: Patroling in sector on 100 mile circle west of MIDWAY. Sighted two DD's (Par. 5, No. 34) angle on bow 000. One of above DD's turned searchlight on GATO as we attempted to get on port beam. Submerged. No attempts made to search or A/S measures. 0526(Y) Sighted airplane (Par. 6, No. 23). 0611(Y) Sighted airplane (Par. 6, No. 24). 0723(Y) Surfaced. Proceeded at full power to station 5 miles west of MIDWAY as directed by ComSubPac. 0743(Y) Sighted flight of airplanes (Par. 6, No. 25), Submerged. 0817(Y) Surfaced. Radar contact airplane 8 - 9 miles. 0819(Y) Radar contact airplane 18 miles. 0859(Y) Sighted flight of airplanes (Par. 6, No. 26). 0902(Y) Submerged. 0931(Y) Surfaced. 0934(Y) Sighted airplane (Par. 6, No. 27). 0937(Y) Sighted airplanes (Par. 6, No. 26). Cruiser type planes headed for GATO. After this vessel submerged enemy planes chased PBY for several miles then returned and patrolled in general location of this vessel for about 45 minutes. Surfaced. Sighted airplane (Per. 6, No. 29). No opportunity to identify ship so submerged. 1116(Y) Surfaced. 1530(Y) Arrived on station 5 miles off MIDWAY. Modified to 12 mile circle during night.

6 June, 1942: Patroling in sector on 12 mile circle west of MIDWAY. 0946(Y) Proceeded to Pearl as directed by ComSubPac. 1530(Y) Sighted airplane (Par. 6, No. 30). 1935(Y) Sighted vessel (Par. 5, No. 35). Maneuvered to clear area as own forces were known to be enroute MIDWAY.

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ENCLOSURE (A)

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7 June, 1942
Enroute Pearl.
Sighted an anchor type mine floating on surface.
Attempted to sink by rifle and machine gun fire.
Unsuccessful. Reported location to ComSubPac.
Sighted vessel (Par. 5, No. 36).

8 June, 1942
Enroute Pearl.
Sighted vessel (Par. 5, No. 37).
Sighted airplanes (Par. 6, No. 31).

9 June, 1942
Enroute Pearl.
Sighted several USN, PBY's during the day. Gave main storage battery an equalizing charge followed by test discharge at 6 hour rate.
Required time 6 hours, 20 minutes, actual - 6 hours, 50 minutes.

10 June, 1942
Enroute Pearl.
Joined up with LITCHFIELD and GRENADIER. Returned in company to Pearl.

2. Weather.

Enroute to area excellent weather experienced with light to moderate winds and swells from northeast. Brilliant moonlight during period 27 April - 5 May gave almost daylight visibility all night. Weather on station excellent. Fair NE and E winds during day until 9 May.

9 - 16 May visibility low 5-6,000 yards due to haze and low lying clouds. Strong NE winds on 17 May cleared haze and visibility improved.

Good weather and moderate sea prevailed throughout the remainder of the patrol except for occasional rain squalls which became more frequent about 1 June. The sea became slightly less moderate when nearing Pearl Harbor, this being first noted on about 8 June when a westerly swell with some cross sea from the north was encountered.

3. Tidal Information.

The predicted southwesterly and westerly currents were encountered while on station with considerable affect due to the atoll and its tide being observed. At times while operating close to ROT (to south westward) a north to northeasterly current of 1.0 knots was encountered. This current was believed to be an eddy current due to toe sweep of the westerly

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ENCLOSURE (A)

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U.S.S. GATO - Report of First War Patrol.

current past ROI. Strong-westerly currents, 8- to 1.0 knots were found between ZECHARI and EBALON ISLANDS. Off GEA, NORTH, and NELLU ISLAND PASSES variations in current were experienced which could only be due to the affect of tides. The maximum value of this current noted was 1.0 knots.

4. Navigational aids.

KAVALJELIN ATULL - No navigational lights were visible and only once in the twelve (12) nights that this vessel surfaced close off ROI ISLAND were night flying lights observed.

Positions throughout the day were very easily obtained by the use of tangents and mid points of the numerous islands which form the atoll.

Night celestial observations, when necessary, were made with fair results using the ordinary sextant. However, it is believed that under certain conditions of visibility the horizon will be such as to make this unreliable and then the bubble sextant or octant will have to be used.

Two radio towers (lattice-work type) on ENUBU ISLANDS, 2.6 miles northwest of KAVALJELIN ISLAND (towers in line on 3089 - 1489).

Three radio towers on ENUBU ISLAND, 2 miles southwest of ROI ISLAND.

Two cross-tree type lookout towers on strand 1.3 miles north of north tip of KAVALJELIN ISLAND.

Three aircraft hangars or storishouses on west side of ROI ISLAND.

J.

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5. Contacts, ships.

No. | Date | Time | Position | Course | Speed | Description
---|---|---|---|---|---
1. | 4/29/42 | 0538(L) | 9°35'N | 167°24'E | 3400T | 7-8 Wailing tender similar to picture No. 94 of ONI Recog. of Jap.Mer. Vessels, Bridge structure appeared higher and gun mounted forward and aft. Funnel markings and white bridge superstructure still present.
2. | 4/30/42 | 1513(L) | 9°20'N | 126°46'E | 3400T | 7-8 Auxiliary sailing vessel about 150' long, 3 miles bearing 2300T. Crows nest on foremast No sails, no signs of beaming armed.
3. | 5/1/42 | 0951(L) | 9°21'N | 167°22'E | Various 7-8 | Two "Catcher Type" patrol vessels. Same as contact No.1. Those vessels very active in patrolling off entrance to NORTH PACIFIC from HELIU ISLAND to ROI ISLAND about 3-4 miles off shore.
4. | 5/1/42 | 1032(L) | 9°29'N | 167°28'E | N7 & N ? | Vessels similar to photos 62-64 in identification of Japanese Merchant Vessels, Stood up from south part of lagoon and anchored south of ROI ISLAND.
5. | 5/3/42 | 0417(L) | 6°30'N | 167°12'E | SW | 7-8 Catcher Type patrol vessel. Clearly visible in brilliant moon light about 5 miles bearing 1200T.
6. | 5/3/42 | 1032(L) | 9°29'N | 167°28'E | Anchored - | Contact No. 4 and 3 other cargo type anchored south of ROI ISLAND.

- 11 - ENCLOSURE (A)

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7. 5/3/42 1315(L) 90 23.5 N 1140T 1670 22.5'E
: 8. 5/4/42 1350(L) 90 20 N 1670 22' E
: 9. 5/4/42 1607(L) 90 23 N 1670 19' E
: 10. 5/5/42 1140(L) 90 22' N 1670 35' E
: 11. 5/5/42 1337(L) 90 22' N 1670 16' E
: 12. 5/6/42 0923(L) 80 3.4 N 1670 45' E
: 13. 5/7/42 0523(L) 80 3.4 N 1670 52' E
: 14. 5/7/42

— page 21 —
15. 5/7/42 1344(L) 80 52 1670 46 4 4-6
: 16. 5/8/42 1005(L) 90 22 1670 28 5-6
: 17. 5/8/42 1228(L) 90 28 1670 25 0900 6-7
: 18. 5/8/42 1648(L) 90 24 1670 28 2900 10
: 19. 5/11/42 0536(L) 80 44 1670 29 6-7
: 20. 5/12/42 0938(L) 80 43 1670 28 6-7
: 21. 5/13/42 0541(L) 80 48 1670 16 6-7
: 22. 5/13/42 1348(L) 80 45 1670 34 6-7
: 23. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 24. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 25. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 26. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 27. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 28. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 29. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 30. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 31. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 32. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 33. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 34. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 35. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 36. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 37. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 38. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 39. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 40. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 41. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 42. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 43. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 44. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 45. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 46. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 47. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 48. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 49. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 50. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 51. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 52. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 53. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 54. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 55. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 56. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 57. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 58. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 59. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 60. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 61. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 62. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 63. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 64. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 65. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 66. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 67. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 68. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 69. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 70. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 71. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 72. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 73. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 74. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 75. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 76. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 77. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 78. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 79. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 80. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 81. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 82. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 83. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 84. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 85. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 86. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 87. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 88. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 89. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 90. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 91. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 92. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 93. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 94. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 95. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 96. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 97. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 98. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 99. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 100. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 101. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 102. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 103. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 104. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 105. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 106. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 107. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 108. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 109. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 110. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 111. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 112. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 113. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 114. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 115. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 116. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 117. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 118. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 119. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 120. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 121. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 122. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 123. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 124. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 125. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 126. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 127. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 128. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 129. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 130. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 131. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 132. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 133. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 134. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 135. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 136. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 137. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 138. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 139. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 140. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 141. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 142. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 143. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 144. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 145. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 146. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 147. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 148. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 149. 5/13/42 1510(L) 80 48 1670 31 3000 7
: 150. 5/13/42 1348(L) 80 45 1670 31 3000 7
: 151. 5/13/42 1510(L) 80 48

— page 22 —
U.S.S. GATO - Report of First War Patrol.

| No. | Date       | Time  | Position | Course | Speed | Description                                                                 |
|-----||-------|||-------||
| 24  | 5/17/42   | 0742(L)| 8°53' N  | Var1   | 6-7   | Sampan type patrol vessel on patrol off BICHEL CHANNEL, Bear- |
|     |            |       |          |        |       | ing 2370T, 3.5 miles. On station all day. Four patrol vessels, 1 "G" type, 2. "Catcher Type," and 1 sampan, bearing 2950T, 3.5 miles. |
| 25  | 5/18/42   | 0941(L)| 8°43' N  | 0750T | 7-8   | One freighter-passenger-7-8,000, one tanker, 7,000, Two men of var (tender type), Four freighters 3-5,000. Sampan type patrol vessel on station off NORTH PASS, Patrol all day. One large freighter-7-8,000. One small freighter 4,000. Same as No. 27. |
| 26  | 5/18/42   | -      | KAVAJALESIN ANCHORAGE |        |        | Same as No. 27. |
| 27  | 5/19/42   | 1021(L)| 9°21' N  | 2120T | 5-6   | Same as No. 27. |
| 28  | 5/19/42   | -      | ROI ANCHORAGE |        |        | Same as No. 27. |
| 29  | 5/20/42   | 0900(L)| Off NORTH PASS | 2130T | 5-6   | Same as No. 27. |
| 30  | 5/22/42   | 0929(L)| Off NORTH PASS | 1090T | 5-6   | Same as No. 27. |
| 31  | 5/23/42   | 0554(L)| 9°26'N  | 1150T | 8-10  | Small tanker similar to photo No. of Rec. of Japanese Merchant Vessels. Bear- |
| 32  | 5/23/42   | 116(L)| Off NORTH PASS | Var.   | 5-6   | Same as No. 27. |
| 33  | 5/24/42   | 1006(L)| Off NORTH PASS | Var.   | 5-6   | Same as No. 27. |
| 34  | 6/5/42    | 0405(Y)| 28°14'N  | 2700T | 10    | 2 DD's, Speed was increased to get on port beam for attack. One DD turned searchlight on GATO. |
| 35  | 6/6/42    | 1935(Y)| 26°23'N  | NW     | 12-15 | Large vessel headed toward MIDWAY. |
| 36  | 6/7/42    | 1758(X)| 24°41'N  | 1000T | 14    | Submarine sighted. Later identified as GRENADIER. |
| 37  | 6/8/42    | 0857(Z)| 23°21'N  | 1100T | 14    | Submarine, Later identified as GRUNALIER. ENCLOSURE (A) |

Note: The text is transcribed in a structured format with clear headings and subheadings.

— page 23 —
6. Contacts, aircraft.

| No. | Date | Time | Position | Distance | Course | Description |
|-----|------|------|||||
| 1.  | 4/22/42 | 1045(?) | 180.0N-8.5Miles | 1650.7 | 13150 | 1. 4/27/42 1900(M)1243 | N 4 to 6 1740? | E miles |
| 2.  | 4/27/42 | 0529(M) | 1145 | 2 to 4. | 1710 | 1581 | 4. 5/1/42 0951(L)920 | N 5-6 miles |
| 3.  | 5/2/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 5. 5/3/42 1349(L)920 | N 5 to 7 miles |
| 4.  | 5/4/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 8. 5/5/42 0947(L)926 | N 3 miles |
| 5.  | 5/8/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 9. 5/8/42 0900(L)924 | N 4 miles |
| 6.  | 5/8/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 10. 5/8/42 1724(L)924 | N 4 miles |
| 7.  | 5/20/42 | 1002(L) | 1670 | 2 to 6. | 1670 | 927 | 11. 5/20/42 1002(L) | Over NORTH 3 miles |
| 8.  | 5/21/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 12. 5/21/42 0732(L) | Over NORTH 4 miles |
| 9.  | 5/26/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 13. 5/26/42 1413(L) | 1703? | 4 miles |
| 10. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 14. 5/30/42 1412(Y) | 1760? | 4 miles |
| 11. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 15. 5/30/42 1517(Y) | 1780? | 5 miles |
| 12. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 16. 5/30/42 1517(Y) | 1780? | 5 miles |
| 13. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 17. 5/30/42 1412(Y) | 1760? | 4 miles |
| 14. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 18. 5/30/42 1412(Y) | 1760? | 4 miles |
| 15. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 19. 5/30/42 1412(Y) | 1760? | 4 miles |
| 16. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 20. 5/30/42 1412(Y) | 1760? | 4 miles |
| 17. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 21. 5/30/42 1412(Y) | 1760? | 4 miles |
| 18. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 22. 5/30/42 1412(Y) | 1760? | 4 miles |
| 19. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 23. 5/30/42 1412(Y) | 1760? | 4 miles |
| 20. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 24. 5/30/42 1412(Y) | 1760? | 4 miles |
| 21. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 25. 5/30/42 1412(Y) | 1760? | 4 miles |
| 22. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 26. 5/30/42 1412(Y) | 1760? | 4 miles |
| 23. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 27. 5/30/42 1412(Y) | 1760? | 4 miles |
| 24. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 28. 5/30/42 1412(Y) | 1760? | 4 miles |
| 25. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 29. 5/30/42 1412(Y) | 1760? | 4 miles |
| 26. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 30. 5/30/42 1412(Y) | 1760? | 4 miles |
| 27. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 31. 5/30/42 1412(Y) | 1760? | 4 miles |
| 28. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 32. 5/30/42 1412(Y) | 1760? | 4 miles |
| 29. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 33. 5/30/42 1412(Y) | 1760? | 4 miles |
| 30. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 34. 5/30/42 1412(Y) | 1760? | 4 miles |
| 31. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 35. 5/30/42 1412(Y) | 1760? | 4 miles |
| 32. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 36. 5/30/42 1412(Y) | 1760? | 4 miles |
| 33. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 37. 5/30/42 1412(Y) | 1760? | 4 miles |
| 34. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 38. 5/30/42 1412(Y) | 1760? | 4 miles |
| 35. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 39. 5/30/42 1412(Y) | 1760? | 4 miles |
| 36. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 40. 5/30/42 1412(Y) | 1760? | 4 miles |
| 37. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 41. 5/30/42 1412(Y) | 1760? | 4 miles |
| 38. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 42. 5/30/42 1412(Y) | 1760? | 4 miles |
| 39. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 43. 5/30/42 1412(Y) | 1760? | 4 miles |
| 40. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 44. 5/30/42 1412(Y) | 1760? | 4 miles |
| 41. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 45. 5/30/42 1412(Y) | 1760? | 4 miles |
| 42. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 46. 5/30/42 1412(Y) | 1760? | 4 miles |
| 43. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 47. 5/30/42 1412(Y) | 1760? | 4 miles |
| 44. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 48. 5/30/42 1412(Y) | 1760? | 4 miles |
| 45. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 49. 5/30/42 1412(Y) | 1760? | 4 miles |
| 46. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 50. 5/30/42 1412(Y) | 1760? | 4 miles |
| 47. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 51. 5/30/42 1412(Y) | 1760? | 4 miles |
| 48. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 52. 5/30/42 1412(Y) | 1760? | 4 miles |
| 49. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 53. 5/30/42 1412(Y) | 1760? | 4 miles |
| 50. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 54. 5/30/42 1412(Y) | 1760? | 4 miles |
| 51. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 55. 5/30/42 1412(Y) | 1760? | 4 miles |
| 52. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 56. 5/30/42 1412(Y) | 1760? | 4 miles |
| 53. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 57. 5/30/42 1412(Y) | 1760? | 4 miles |
| 54. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 58. 5/30/42 1412(Y) | 1760? | 4 miles |
| 55. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 59. 5/30/42 1412(Y) | 1760? | 4 miles |
| 56. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 60. 5/30/42 1412(Y) | 1760? | 4 miles |
| 57. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 61. 5/30/42 1412(Y) | 1760? | 4 miles |
| 58. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 62. 5/30/42 1412(Y) | 1760? | 4 miles |
| 59. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 63. 5/30/42 1412(Y) | 1760? | 4 miles |
| 60. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 64. 5/30/42 1412(Y) | 1760? | 4 miles |
| 61. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 65. 5/30/42 1412(Y) | 1760? | 4 miles |
| 62. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 66. 5/30/42 1412(Y) | 1760? | 4 miles |
| 63. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 67. 5/30/42 1412(Y) | 1760? | 4 miles |
| 64. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 68. 5/30/42 1412(Y) | 1760? | 4 miles |
| 65. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 69. 5/30/42 1412(Y) | 1760? | 4 miles |
| 66. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 70. 5/30/42 1412(Y) | 1760? | 4 miles |
| 67. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 71. 5/30/42 1412(Y) | 1760? | 4 miles |
| 68. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 72. 5/30/42 1412(Y) | 1760? | 4 miles |
| 69. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 73. 5/30/42 1412(Y) | 1760? | 4 miles |
| 70. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 74. 5/30/42 1412(Y) | 1760? | 4 miles |
| 71. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 75. 5/30/42 1412(Y) | 1760? | 4 miles |
| 72. | 5/30/42 | Various | 1670 | 2 to 6. | 1670 | 927 | 76. 5/30/42 1412(Y) | 1760? | 4 miles |
| 73. | 5/30/

— page 24 —
7

CONFIDENTIAL

Subject: U.S.S. G.T.O. - Report of First War Patrol.

| No. | Date       | Time         | Position & Bearing | Course | Description                                                                 |
|-----||||||
| 16  | 5/31/42  | 0523(Y)     | 28°11' N 030°7' m | 290°T  | U.S. PBY                                                                     |
|     |            | 0534(Y)     | 179°56' W 150°5' m | 260°T  | U.S. PBY                                                                     |
| 17  | 6/2/42   | 0607(Y)     | 28°31' N 358°3' m | 260°T  | U.S. PBY                                                                     |
|     |            | 178°50' E   |                  |        |                                                                                 |
| 18  | 6/3/42   | 0552(Y)     | 28°41' N 020°3' m | 260°T  | U.S. PBY                                                                     |
|     |            | 179°00' E   |                  |        |                                                                                 |
| 19  | 6/3/42   | 1410(Y)     | 29°04' N 330°5' m | East  | U.S.N. PBY                                                                  |
|     |            | 178°55' E   |                  |        |                                                                                 |
| 20  | 6/4/42   | 1546(Y)     | 29°09' N 270°7' m | 090°T  | U.S.N. PBY                                                                  |
|     |            | 179°02' T   |                  |        |                                                                                 |
| 21  | 6/4/42   | 1555(Y)     | 29°10' N 280°8' m | 090°T  | U.S.N. PBY                                                                  |
|     |            | 179°03' W   |                  |        |                                                                                 |
| 22  | 6/4/42   | 1620(Y)     | 29°15' N 225°7' m | 090°T  | U.S.N. PBY                                                                  |
|     |            | 179°06' W   |                  |        |                                                                                 |
| 23  | 6/5/42   | 0526(Y)     | 28°34' N 180°1' m | 090°T  | Float type biplane.                                                                 |
|     |            | 179°17' W   |                  |        |                                                                                 |
| 24  | 6/5/42   | 0611(Y)     | 28°17' N 330°3' m | 300°T  | U.S.N. PBY                                                                  |
|     |            | 179°14' W   |                  |        |                                                                                 |
| 25  | 6/5/42   | 0743(Y)     | 28°20' N 165°5' m | 090°T  | Flight of approx. 12 fighter planes.                                                      |
|     |            | 179°08' W   |                  |        |                                                                                 |
| 26  | 6/5/42   | 0902(Y)     | 28°21' N Overhead | 090°T  | Four USA B-17's                                                                    |
|     |            | 178°51' W   |                  |        |                                                                                 |
| 27  | 6/5/42   | 0934(Y)     | 28°21' N 270°4' m | 090°T  | U.S.N. PBY                                                                  |
|     |            | 178°48' W   |                  |        |                                                                                 |
| 28  | 6/5/42   | 0937(Y)     | 28°21' N 240°3' m | 060°T  | 2 - cruiser float biplanes.                                                             |
|     |            | 178°48' W   |                  |        |                                                                                 |
| 29  | 6/5/42   | 1055(Y)     | 28°21' N 065°2' m | 245°T  | U.S.N. PBY                                                                  |
|     |            | 178°40' W   |                  |        |                                                                                 |
| 30  | 6/6/42   | 1530(Y)     | 27°09' N 032°T-10 m | 140°T  | U.S.N. PBY                                                                  |
|     |            | 176°27' W   |                  |        |                                                                                 |
| 31  | 6/8/42   | 1350(X)     | 22°55' N 330°8' m | 120°T  | U.S.N. PBY's - 2                                                                    |
|     |            | 176°44' W   |                  |        |                                                                                 |

- 16 -

ENCLOSURE (a)

— page 25 —
1. ROI ISLAND - KWATALEIN ATOLL

Two patrol vessels of the "Gatcher Type" (Photo 94 - "Identification of Japanese Merchant Vessels") maintained west of ROI ISLAND during dark, daylight and, to north and sonic gear, 22 kcs., hand-keyed. No evidence that this vessel was ever detected but patrol vessels were of high nuisance value in preventing closer off-shore patrol and necessary to avoid for periscope exposures. This was particularly true on afternoon of 8 May when a close patrol of NORTH PASS was prevented by patrol vessel conducting very active line patrol NW of ROI ISLAND.

Airplane A/S screen was noted over ASAMA MARU vessel during its sortie on May 8.

A/S searching after attack on KASUGA LARU, 3 May, and depth charges attack on 4 May was very ineffective. This vessel was able to clear searching vessels by going to deep submergence and running silent. Destroyers steamed vessels used super-sonic searching, 22kcs., hand pinging at long intervals.

2. GEA PASS - KWATALEIN ATOLL

Patrols of GEA PASS very active. Line patrolled about 4 - 5 miles off entrance and to S.W. of entrance. No evidence of vessels being equipped with super-sonic gear. Escape from patrol vessel after Attack No. 2 on 5/13/42 made with no difficulty.

9. Major defects experienced.

On 27 April, 1942, shortly after submerging, the stern planes gave faulty operation. Investigation revealed the following:

(a) Mal-operation of tilting switch by inexperienced man had resulted in motor running most of the time in first set of resistor units causing these units to overheat.

-17- ENCLOSURE (A)

— page 26 —
1. U.S.S. GATO - Report of First War Patrol.

(b) Resistor units are recessed in overhead, amidships between frame spaces in after torpedo room. Air pocket caused electric cables running over top of resistors to char, destroying insulation of cables.

Defect was remedied by:

(a) Remove cables from over the top of the resistors, removing charred insulation, wrapping with insulating materials and re-installing beneath and clear of resistors.

(b) To assist cooling of resistors two holes were cut in top of supply air duct in way of resistor attack so that a blast of air is directed into each resistor unit.

(c) Proper instruction given to apprentice seamen being trained for plansmen.

10. Radio reception.

Radio reception while on the surface was good throughout the entire patrol. The copper screen shielding around the radar duplex unit greatly improved the reception and at no time was radar interference so great that the Fox schedules could not be copied. Two messages addressed to this vessel were not received. The code word of the last messages sent and received are ALBU. and TRDEE.

No difficulty was experienced in contacting NMI on 4870 Kcs. No enemy interference was experienced.

Press was obtained when on the surface at 0600 GMT from KMS San Francisco on 12550 or 6270 Kcs.

Underwater reception was not successful while on patrol station. On station off HUDAY, depths of 52 to 56 feet were necessary in order to obtain satisfactory reception. The vertical antenna was used to transmit two contact reports. Only one preliminary call-up in each one was necessary.

The radar proved of great value in the location of planes of high altitude. In several cases planes were reported by the radar watch before they were sighted by the lookouts. This equipment will not indicate the presence of low flying planes or surface ships. Reliable ranges up to 10 miles were not uncommon.

- 18 -

ENCLOSURE (A)

— page 27 —
U.S.S. GATO - Report of First War Patrol.

Excessive trouble was experienced in keep the radar equipment functioning properly. Many grounds and bad contacts due to salt water, several tube failures, and loose connections necessitated many extra hours work to keep the equipment operating. It is recommended that 200 - 300% spares of the 8014 and 9001 type tube be carried at all times.

11. Sound conditions.

The sound equipment functioned very satisfactorily. Contacts up to 7500 yards were obtained while on station. The sound conditions in the patrol area were excellent.

There are three radiomen (a/o:rd; two third-class and one second class. This complement of radiomen is considered an absolute minimum.

12. Health and Habitability.

Excellent. No contagious diseases and only two patients admitted to the sick list; one with a strained back and the other with tonsillitis.

Considerable water was obtained from the air conditioning drains and this was used to wash clothes. There was no washing machine on board.

Both air conditioning units were run continuously and after considerable experimenting it was found that the following set-up provided maximum comfort during all day dives:

(a) Exhaust blower run at 1/4 speed and exhaust discharge to the supply blower.

(b) Supply blower run at 1/4 speed and take just enough suction from engine room so as to create a barely perceptible flow from crew's quarters to the engine room.

(c) Air lock doors and engine room forward watertight door open.

While on the surface the control room supply ducts should be kept with dampers partially shut to allow sufficient air to the forward battery and forward torpedo room.

- 19 - ENGLISH (A)

— page 28 —
20,600
: 20,600
: 25
: 10+

14. Necessary for complying with Contract for 7 despatch 062100 of June, 1942, caused amending of this patrol.

15. General discussion.

(1) ROI ISLAND - KIAJALETIN ATOL.

The Commanding Officer believes that the majority of the vessels using NORTH AASS approach on courses between 3100T and 2700T and depart on same sector. The destroyer attack on 4 May was probably preliminary to sortie by KIAJALETIN. Close in-once presence of chamber entrances is impossible. The attack on the KIAJALETIN was in a mile off the entrance to NORTH AASS is thought to have been a complete surprise. It is regretted that an error in speed estimate prevented more success from this attack.

(2) Engineering.

The performance of all main propulsion equipment was very satisfactory.

The 80-90 load-speed curve was used in operating the main engines (General Motors Model 16-24S). Lubricating oil and fresh water temperatures were maintained at 1550 - 1600. Total engine hours of 1600, 900 and 850 hours have been reached on three of the main engines of this vessel. These engines have been running at the 80-90 load-speed curve for 1300, 630 and 550 hours respectively. No operational difficulties have been experienced during this period that could be traced to operation at the 80-90 curve. An overhaul of the engine having 1600 hours of operation to date has been requested for the refit period. Liners, pistons and rings will be carefully inspected if this overhaul is granted and definite technical information obtained. If this examination further bears out the present satisfactory operation of the engine it is definitely believed that the 16-24 engine should be run at the 80-90 load-speed combination.

- 20 -

ENCLOSURE (A)

— page 29 —
1. U.S.S. GAVIN - Report of first War Patrol.

Minor difficulty was experienced with #2 auxiliary engine when two cylinder liners were slightly scored due to a drop in lubricating oil pressure from 50 to 30 lbs./in^2 occasioned by a leaky fuel injector. Engine was repaired and piston rings were renewed on all units as gap clearances had reached maximum tolerances. Both #1 and #2 auxiliary engines have been made the subject of a letter to the Board of Inspection and Survey through official channels, due to excess vibration and overheating in sea water of 60° temperature.

Minor difficulty was experienced with topside lighting fixtures and instruments leaking through cables into the ship, grounding out circuits. Removal of these cables with plugs where they enter pressure proof hull has been made the subject of an item on the repair list.

Performance of Kleinschmidt distillers was very satisfactory. Each unit was operated for periods of 430 hours and 320 hours respectively, averaging 44 gal./hour, distilled. Units are still capable of operation. It is believed that length of operation was made possible by keeping overflood water between 20 to 25 gal./hour, using 6 to 8 heaters and using compression pressures of 5.5 to 6.1 lbs./in^2 during the entire period of operation of both units. Vent temperatures were 200° to 210° with feed pump discharge pressures averaging 21 lbs./in^2. The last 12 hours of operation on each unit was made with a saturated solution of one pound of corn starch and fresh water being introduced into the feed. This was done at the Naval Experimental Station to decrease fouling and should make it assembly and cleaning easier.

It was not possible to conduct a full 4 hour equalizing charge of 16 constant readings every 21 days of the patrol. However, the required 16 readings were obtained over a 21 day period by equalizing at intervals of 5 to 6 days securing as many constant readings as time permitted during the charge at night usually 4 to 8 readings being secured. This procedure was recommended by the manufacturers representative under conditions when a regular equalizing charge would be impracticable.

During the 29 day period of consecutive dives averaging slightly less than 15 hours per day in sea water of 81 degrees temperature, the following information was secured. Maximum temperature reached -132°; average daily battery water consumption - 107 gallons; maximum hydrogen content in boat at end of dive prior to surfacing - .6% (average about .3%.

- 20 -

ENCLOSURE (A)

— page 30 —
21 - ENCLOSURE (A)

Subject: U.S.S. GATO - Report of First War Patrol.

(3) Binoculars.

While this patrol did not offer difficult conditions for binoculars, the fact that 6 out of 9 pairs of 7-50's and 3 out of 3 pairs of 6-30's remain in good condition is evidence of considerable improvement in the Waterproofing and fixing of the prisms by the tender optical repair section.

— page 31 —
1. The Commander Submarine Division EIGHTY-ONE (Ss)
   - Serial (022)
   - From: The Commander Submarine Division EIGHTY ONE.
   - To: The Commander Submarines, PACIFIC FLEET.
   - Subject: U.S.S. GATO (SS212) - First Var Patrol;
      Report of.

Reference:
   - (a) Consubpac Conf. Ltr. No. 3-42.
   - (b) Consubpac Conf. Ltr. No. 2-42.

1. It is noted that the GATO's patrol report was compiled in accordance with the instructions contained in reference (a) which was in effect at the time this vessel departed for patrol. The commanding officer has been directed to submit the additional information required by reference (b), and a copy of his war diary for the period in which the vessel was engaged in operations off Midway.

2. The presence of the "Catcher Type" patrol boats of 257 gross tons (Figure 94, Recognition of Japanese Merchantmen) with guns mounted both fore and aft, is a decided deterrent to active submarine operations against an atoll such as Kwajalein. Once the presence of a submarine has been determined by the enemy, the question immediately arises, should a submarine without sufficient gun power to engage such a vessel, destroy them by torpedo fire in order to obtain its mission. Such action would give the submarine maximum freedom of operation during the remainder of its patrol since replacement of these vessels could not be quickly accomplished in an area so distant.

3. It is believed that the failure of the attack of the GASUGA was due to an over-estimate of enemy speed and the fact that the enemy maneuvered to avoid. The command officer states that upon firing the fifth torpedo he saw the GASUGA backing down. The commanding officer's action in the pursuit of the ASALI LIKU for twelve (12) hours was most aggressive.

4. The appearance of the officers and crew of the GATO, upon completion of the patrol, gave every indication that the morale is high.

Copy to: COLUMBIA 8
CO GATO
-1-
W. II. DOWNS
ENCLOSURE (B)

— page 32 —
5/8/46-3
Serial 044
June 11, 1942

CONFIDENTIAL
From: Commander Submarine Squadron EIGHT.
To: Commander Submarines, Pacific Fleet.
Subject: U.S.S. GATO, report of First War Patrol;
Comments on:

1. The first war patrol of the U.S.S. GATO was conducted in an inactive area. Attack opportunities were limited to two, each of which apparently was unsuccessful. Failure of the attack on the KASUGA is a disappointment, unquestionably felt no more keenly by anyone than by the personnel of the GATO.

2. Material performance of the ship was excellent. This is due in no small part to the manifest attention devoted by ship's personnel to material upkeep during the period of the war patrol. Radar performance in indicating the presence of all but low flying planes is most gratifying.

3. The patrol report reflects the excellent morale of personnel of this submarine. It is felt that they are to be congratulated upon a war patrol that was well conducted in an aggressive spirit.

C. H. ROPER.

Copy to:
Consubdiv 81
U.S.S. GATO

ENCLOSURE (C)

— page 34 —
1/2/47
Serial 01072
Care of Fleet Post Office,
San Francisco, California,
September 15, 1942.

CONFIRMED BY
COMMANDER PATROL REPORT NO. 69
U.S.S. GATO - SECOND WAR I - NAVY.

From: The Commander Submarines, Pacific Fleet.
To: Submarines, Pacific Fleet.

Subject: U.S.S. GATO (SS212) - Second War Patrol - Report of.

Enclosure: (A) Copy of Combat Group 8.5 Conf 1tr TGc.5/AL6-3 Serial 018 of August 30, 1942.
(B) None.
(C) Copy of subject war patrol.

1. This patrol of the GATO was in general well conducted. The Commanding Officer covered his assigned areas in spite of bad weather.

2. The commanders of Commander Task Group 8.5 in paragraph 3 of his endorsement are concurred in.

3. The Commander Task Force S-2V cannot agree with the Commanding Officer, U.S.S. GATO, that a submarine should remain in an area no longer than thirty days. The distances which must be traversed by vessels of this Task Force going to and from their assigned areas make it necessary that submarines remain on station as long as possible. If, when fatigue is apparent, the Commanding Officer retires temporarily to rest the crew, the submarine can remain on patrol longer and save much enroute time.

4. GATO is credited with the following damage to the enemy:

SUNK

1 Freighter - 9,300 tons.

DECLASSIFIED ART. 0445, OPNAVINST 5510.1C

BY OP 2ARC DATE 5/6/42
DISTRIBUTION
(21CM-42)
1st I, Case 2:
PI(5), SSs.
Special: EN3(5); Consubstant(2);
Consubswospac(2); Cominch(5).

E. R. S. TINBURNE,
Flag Secretary.

R. H. ENGLISH.

DECLASSIFIED

— page 37 —
0000(V-1) 2 July, 1942 to 1100(Y) 6 July, 1942.
Deported Pearl Under escort. Conducted 3-50 caliber gun and other training cruises. Arrived 17th July, 1942. Busied to capacity, received 15,200 gallons of fuel oil.

6 July 1942
1100(Y)
Reported for duty to Carrier 8. Deported 17th July for patrol area.

12 July 1942
1508(L)
Sighted transport under escort of one DD, (Par. 5-1), Vessels broke through for 2nd air attack. Transmit radio signal change to the 1st and DD headed to air position. Here this vessel submerged. DD steamed at high speed and in a constantly changing head. As a result to be followed by a single course along bearing line of this vessel. DD commenced depth charge attack 1533(Y) to 1612(Y) (Par. 6-1). Position indicated vessels were on a 1st course between 1612-1613.

13 July 1942
0405(L)
Submerged to make patrol during day while crossing great circle tracks from Empire ports to Attu. Kitsa area. Low visibility.

2200(L)
2307(Y)
Attacked Vessel. (Par. 5-2). Nail maneuvering for firing position, target changed course to bring this vessel astern and disappeared in fog. During reconnaissance of the night sighted lights of several fishing sauryas.

15 July 1942
0530(Y)
1706(Y)
Sighted land bearing 290Y. Changed course to patrol subcargo off 000Y. WARN. (Par. 5-3). Sighted 2 fishing sauryas. To less than 1000 yards when about 7 miles off shore. Stopped to the East until 2300(Y) then paralleled coast to southeast to be off 1000Y. At a day. Sauryas sighted during night in brief periods of fair visibility.

16 July 1942
0316(Y)
Sighted for approach to 000Y. Visibility less than 1000 yards so changed course to 0900Y. to patrol in southeast portion of area.

-1-

— page 39 —
1048(K) 1. August 1942
Sighted seas on OLYMPIA TO bearing 2350T + 42 miles.
Tons of mountains sighted above surface fog. Visibility at surface 3 - 5,000 yards. Improved in afternoon.

2. August 1942 0351(K) 2. August 1942 1054(K) 3. August 1942 0730(K) 4. August 1942 1327(K) 5. August 1942 0605(K) 6. August 1942 0300(K) 7. August 1942 0400(K) 8. August 1942 0400(K) 9. August 1942 0535(K) 10. August 1942 0400(K)

Sighted 1048(K) 326. August 1942 1048(K)

— page 40 —
11 August - 15 August 1942
Returning to and patrolling in Area ...

15 Aug. 1942
Arrouto Dutch on great circle course PARATUJINU - ATTU in accordance with Combatant Group C.5 order received on 13 August, 1942. Strong Dutchvind with good visibility heavy overcast. Decided to remain submerged during daylight to increase time along route and chances of interception.

15 Aug. 1942
Sighted two ships (Far: 59), one cargo vessel, 2235(L) IATU, (9300-ton, 294 Recognition of Japanese Merchant Vessels), and one DD about 1000 yards astern of ATU. Made attack firing two torpedoes from stern tubes, two hits (one airships in line with attack), swung right to regain attack position as Commanding Officer thought only one hit was obtained from stern tubes. ATU swung slowly to left at reduced speed. Fired three torpedoes from bow tubes with two hits. DD had searched on starboard side of ATU after first hits and was coming toward vicinity of this vessel so stood to H.S. an high speed. ATU had heavy list (300 409) to port when last sighted (about 2 minutes after firing bow tubes). Star fix obtained later on in evening showed ATU as intercepted on Thumb Line course instead of Great Circle course.

15 August - 20 August 1942
Arrouto Dutch Harbor.

20 Aug. 1942
Arrived Dutch Harbor.

— page 42 —
5. Contacts, ships.

| No. | Date       | Time  | Position | Course | Speed | Description                                                                 |
|-----||-------|||-------||
| 1. | 7/12/42   | 1503(L)| 470.13° N | S.7.1  | 12-15 | Passenger vessel similar to ZULU. 322° of RCOC, off Jap. |
|     |            |       |           |        |       | Icar. Vcs. and one DD. Escort. Bearing 0.60°N, 6 miles on SW Course. |
| 2. | 7/13/42   | 2307(L)| 490.48° N | 170    | 10-12 | Could not identify. 10°V visibility. Still |
|     |            |       |           |        |       | 200° long, no bow and superstructure. |
| 3. | 7/15/42   | 1706(L)| 500.07° N | Var.   | 4-5   | 2,500 yards, lying to, VCS. |
|     |            |       |           |        |       | 2,500 yards, lying to, VCS. |
| 4. | 7/23/42   | 2149(L)| 500.43° N | Lying to| 10    | 2,500 yards, lying to, VCS. |
|     |            |       |           |        |       | 2,500 yards, lying to, VCS. |
| 5. | 7/26/42   | 1200(L)| 500.02° N | E       | 10    | 150° long,

— page 44 —
1. Sound Conditions and Density Layers.

Sound conditions were unfavorable. Maximum range is estimated at less than 2 - 2500 yards. Large temperature gradients existed throughout the area and CONDUCTIVE SEA SURFACE temperatures varied from 38° F. to 53° F. and water temperatures at 100 feet varied from 32° F. to 47° F. Generally, a temperature gradient greater than .06° F. per foot of depth existed.

Density layers were encountered which made the vessel heavy at periscope depth and light at 100 feet with the same trim. On one occasion it was necessary to pump out 16,000 pounds to keep the trim. The water density in the CONDUCTIVE SEA was essentially the same as found in the CAPTIC.

12. Health and Habitability.

The health of the crew on this patrol was markedly inferior to that of the first. Colds and influenza were prevalent, 12 cases of head and chest colds, 2 cases of influenza, and 5 cases of catarrhal fever, acute, for 35 sick days in bed.

Habitability was poor due to the high humidity, cold water and on hours of submergence. The conning tower and both torpedo rooms were especially wet from continuous condensation. One air conditionning unit was run continuously to improve the humidity and reduce sweating of the cold ship's structure. The long hours of daylight and low visibility required submarine for periods averaging 17.5 hours per dive.

13 and 14. Miles Stamped - Fuel Oil Expanded.

| Mileage | Fuel Oil | Fuel Oil | Personnel |
|||||
| 1271    | 12778    | 10.03    | 0         |
| 1853    | 17352    | 9.36     |            |
| 2564    | 18173    | 7.09     |            |
| 1384    | 16330    | 11.8     |            |

# Miles Stamped by Pit Log.

* Gals/Mile is for all purposes.

5. Factors of Endurance Reraining.

| Torpedoes | Fuel | Provisions | Fresh Water | Personnel |
||------||||
| 18        | 42,000| 15         | 20          | 0          |

15. Factor of Endurance Rating Patrol.

Patrol ended by orders of Task Force Commander and end of endurance of personnel.

-8-

— page 45 —
17. Remarks.

The original operation order called for return from patrol area forty-eight days after departure from [Lidway, fifty-two days from Pearl]. This would have required forty-two days on station which in the opinion of the Commanding Officer is too long a period for patrol in enemy waters. The period on station was, upon the recommendation of the Commanding Officer, later reduced by eight days.

The commanding Officer is convinced that thirty days should be the maximum period spent in the patrol area and that the length of a patrol should be not longer than the time enroute to and return from station plus this thirty day limit for time actually on station. This opinion is based upon observation of the limit of endurance of personnel under conditions which exist in a patrol area.

Engineering material of this vessel performed in a satisfactory manner throughout the patrol.

The main engines (CI: -248) were operated in a satisfactory manner throughout the patrol.

A casualty was experienced on each of the motor starter levers due to the failure of the latching mechanism which enables these levers to be placed in the various series on parallel positions. Jig. No. G.E. -15937733 Pc. No. 24 lfg. General Electric Co. name-Control starting Lever Plunger Support (for main motors). Recharge occurred just above threaded portion. To spare parts for the broken part of the latching mechanism is furnished by the manufacturer. However, after the first failure a spare part was manufactured on board and upon failure of the latching mechanism in the opposite lever the time of repair was reduced from 3½ hours to 1½ hours. Each casualty occurred at a time when this vessel was cruising submerged with no particular evolution in progress. However, in case of such a casualty while operating the starter levers in an emergency or quick dive a dangerous situation would occur. It is believed that in this case in design or material should be effected in the near future to insure the reliability and ruggedness of this piece of equipment.

Fresh water consumption was materially decreased during this patrol in comparison with the first year patrol which was made in a special waters. Daily consumption averaged 450 gallons per day. Both distilling units were used every night while on the surface and sufficient water was distilled to meet the requirements. Each distilling unit was operated 275 hours, raising the last 25 hours of operation a bluish tint was noted in the water and upon return.

— page 46 —
35 CONSECUTIVE days that this vessel was subcribed on station, daily submarine exercises of 17 hours and 40 minutes. While on station the average cargo of 11,000 arctic hours was required to effect a normal charge after running at an average speed of 47 R.P.H. throughout the day's submergence. Normal charges were possible each night while on the surface and required 4.5 hours to complete. A 1½ hour overcharge was accomplished every 7 days to compensate for no equilizing charge while on station. Battery water consumption averaged 70 gallons per day for the entire patrol.

-10- [TABULAR DATA: table here]

-10- [TABULAR DATA: table here]

— page 47 —
1942 OCT 21 PM | 59
UNITED STATES PACIFIC FLEET
SUBMARINES, PACIFIC FLEET
Serial 01155
Care of Fleet Post Office,
San Francisco, California,
October 7, 1942.

CONFIDENTIAL
ADDENDA TO:
CONSUBPUC. PATROL REPORT NO. 69
U.S.S. GATO - SECOND WAR PATROL.

From: The Commander Submarine Force, Pacific Fleet.
To: Submarine Force, Pacific Fleet.

Subject: U.S.S. GATO (SS212) - Second War Patrol - Addenda to, (Enclosure (C) only).

1. This war patrol of the GATO was terminated after only 18 days enroute to and on station due to the necessity of recalling the submarine to Pearl Harbor for operations with Task Force Seven. During this period no contacts or attacks were made.

2. The Commander Submarine Force, Pacific Fleet, concurs in the remarks of the Commanding Officer that insufficient time and opportunity were allowed the parlor of the GATO prior to departure on this patrol and believes that when the strategical situation permits, the reoperation period should be sufficiently long to properly rehabilitate the personnel.

R.H. ENGLISH.

Distribution:
(1) CDR-42
1st I, Case 2:
... (SS)
Special:
... (SS)
...

— page 48 —
1. Narrative.
2. 4 September, 1942
   1212 (V)
    Underway from Submarine Base, Dutch Harbor, for patrol in Area 8.5 Operation in accordance with ComTASK-Made passage of ARKAN under air escort from Dutch Harbor. Passed Russian cargo vessel on easterly course south of CAPE MORGAN. (Fare 5-1). Sighted plan (Par. 6-1). Conducted trim dive and exercised at battle stations. Continued and exercised at battle station.

— page 49 —
9 September, 1942
1255(Y) Sighted U.S.N. type PBY plane (Par. 6-3).
2240(Y) Set course at four engine speed to shift area to KISKA and via area in accordance with orders from ComTaskGroup 8.5.

10 September, 1942
0341(Y) Making transit of AMCHITKA PASS, south of SEMISCO-POCHNOI ISLAND. Made careful observations of this island from four miles south of island. No signs of lookout stations or garrison troops ashore. Surfaced about five miles off southwest coast after dark and observed no lights. Set course to be north of SIRIUS POINT on KISKA ISLAND at day-light on 11 September.

2051(Y) Surfaced. Set course to be north of BULDIR ISLAND at daylight.

12 September, 1942
0338(Y) Submerged for daylight patrol north and northwest of BULDIR ISLAND. Maintained this patrol on 13 and 14 September during daylight on line SEMICHI-BULDIR Islands and darkness on line then points 10 miles north of SIRIUS and RED HEAD POINTS.

15 - 20 September, 1942
Patrolled northwest of and north of KISKA. Day-light patrols were maintained on SIRIUS POINT-BULDIR line and north of SIRIUS POINT. Night patrolling done in general area 15-25 miles north of SIRIUS POINT.

20 September, 1942
2100(Y) Set course to enter KISKA AREA on line then point 40 miles north of GULA POINT (SEGULA ISLAND) in accordance with orders from ComTaskGroup 8.5.

21 - 22 September, 1942
At dark set course to clear KISKA AREA on eastern boundary and make transit of AMCHITKA PASS. Prevented from entering PASS during darkness by heavy seas and necessity for navigation by fathometer. (Heavy overcast and low visibility)

— page 50 —
21 - 22 September, 1942 (Cont'd)
had prevented any navigational fix since 18 September, 1942). Made passage of AMCHITKA PASS during darkness 22 September and set course for MIDWAY as ordered by ComTaskGroup 8.5.

22 - 28 September, 1942
Enroute MIDWAY, made rendezvous with surface and air escort, Moorad alongside U.S.S. FULTON and began discharging 22 Mark 14 torpedoes. Transferred twenty-one men of crew to ComSubDiv 81 and received replacements.

29 September 1942.
0600(X) Underway for Pearl, under surface and air escort for thirty miles from MIDWAY.

29 September - 2 October, 1942
Enroute Pearl, Sched U.S.N.PBY (Par. 6-4).

1422(W) Made rendezvous with escort and proceeded into Pearl.

2. WEATHER:
The weather during this patrol was excellent except for four days, 17 - 21 September, when very heavy seas and swell from the north and northeast were present. Vessel rolled heavily when submerged during this time (10° - 12° at periscope depth with swells on the beam).

Heavy overcast and lowered visibility during this time prevented fixing the ship's position by landfall or star sights.

(incorrect version of the original text)

(1) - 3 - - ENCLOSURE (C)

— page 51 —
7/7
: 41 hours
: 197
: 6
: 1257(Y)
: 261
: 7
: 1629(Y)
: 303
: 1.3
: 1900(Y)
: 248
: 8
: 1605(Y)
: 3.0
: 270
: 1.3
: 1630(Y)
: 2.0
: 317
: 7
: 1815(Y)

| Location | Date  | Duration | Drift | End of Obs, Period |
||-------||-------||
| South and South-east of AMATIGNAK ISLAND | 11 | 12 | 090 | 5 | 0745(Y) |
|         |       | 9     | 107  | 7 | 1658(Y) |
|         |       | 22    | 303  | 2 | 1637(Y) |
|         |       | 24    | 014  | 3 | 1700(Y) |
|         |       | 24    | 093  | 5 | 1703(Y) |
| North and North-west of BULDIR ISLAND | 12 | 13 | 054 | 1.0 | 0800(Y) |
|         |       | 10    | 130  | 7 | 1730(Y) |
|         |       | 24    | 052  | 6 | 1806(Y) |
|         |       | 13    | 029  | 3 | 0756(Y) |
|         |       | 10    | 109  | 4 | 1835(Y) |

The prevailing currents were:

(a) South and Southeast of AMATIGNAK ISLAND:
   - Set 260°T - Drift, 7 knots

(b) North of SIRIUS POINT (KISKA ISLAND):
   - Set 080°T - Drift, 5 knots

(c) North of KISKA - BULDIR ISLAND Line (Midway between):
   - Set 050°T - Drift 1.0 knots

(d) North and Northwest of BULDIR ISLAND:
   - Set 080°T - Drift, 7 knots.

ENCLOSURE (C)

— page 52 —
5
CONFIDENTIAL
Subject: U.S.S. GATO - Report of Third War Patrol.

4. Navigational Aids

AMATITNIAK ISLAND: Western end of this island when viewed from south and southeast has a rough sea-tooth outline near the tangent. Eastern end is large round "chocolate-drop" land. This can be easily mistaken for a separate small island when viewed from the south.

SEMISPOCCENOT ISLAND: Eastern tangent of this island viewed from the south is a long gentle slope. Fanks were easily identified and with tangents gave good positions. Depth of water choked very closely with chart.

BUILDER ISLAND: Summit of rock in center of island clearly defined. Large pinnacle rock, similar in outline to Priest Rock but larger and not so sharp, is easily seen off the west coast of the island when viewed from the north.

Depth of water to west of BULLIDR ISLAND near limit of KISKA AREA is less than shown on the chart. The 100 fathom curve appears to be about 5 miles north of the location shown on the chart. Depths less than 400 fathoms were noted in position 520 32'N, 1750 35' E.

6. Contacts, Aircraft.

| No. | Date    | Time    | Position | Distance & Bearing | Course | Description |
|-----|||||||
| 1. | 9/4/42 | 1437(W) | AKUTAN   | 5 1500T         | 0300T  | 2 engine U.S. Army bomber or transport. |
| 2. | 9/8/42 | 1323(Y) | 7 miles east of AMATITONAK | 10 000T | 0600T  | USN - PBY |
| 3. | 9/9/42 | 1255(Y) | 8 miles S.E. of AMATITONAK | 10 3000T | 0000T  | USN - PBY |
| 4. | 10/1/42 | 1422(W) | 210 53' N 8 1630 30' W | 2000T  | 2100T  | USN - PBY |

9. Major Defects Experienced.

In the course of transfer of torpedoes to U.S.S. FULTON, one torpedo whrank was found damaged. Upon removal of the exploder mechanism the whrank exploder cavity was found swollen and deformed, and one of the exploder vacuum tubes broken. The torpedo, warhead, and exploder were transferred to the U.S.S. FULTON and an investigation will be made by tender personnel.

(5) ENCLOSURE (C)

— page 53 —
10. Radio Reception.

Radio reception throughout the entire patrol was good.

One transmission was made on 4/235 XGS. On the preliminary call-up the following stations answered: NPG, NPC, NWZ, and NFR. The message was tanko by NPG.

Underwater reception was not used at any time other than to determine its possibilities. NPG was never heard while submerged. NFR was received at depths between 52 and 55 feet.

The radar operated satisfactorily and was used mostly for navigational purposes. Ranges up to 25 miles were received.

11. Sound Conditions and Density Layers.

Sound conditions were fair. No density layers were noted. The temperature gradient was very small. Water was uniformly at 47° to 48° F.

12. Health and Habitability.

Health and habitability were improved over the second patrol. An outbreak of head and chest colds occurred about twelve days out of port.

The torpedo rooms, especially the after room, were damp from condensation on the single hull despite the continuous operation of one air conditioning unit.

13. and 14. Miles Stamped - Fuel Oil Expanded.

| Miles* | Fuel Oil-Calg. | Gals/Mile |
|-------|||
| Duth Harbour to Area | 586 | 824.5 | 14.1 |
| Patrol in Areas | 1395 | 9056 | 6.5 |
| Area to Midway | 1738 | 17872 | 10.3 |
| Midway to Pearl | 1228 | 20223 | 15.7 |
| Total | 5008 | 55236 | Average 11.08 |

* Miles steamed by pitometer log.
# Gals/Mile is for all purposes.

- 6 -

ENCLOSURE (C)

— page 54 —
15. Factors of Endurance Remaining.

Torpedoes 2 35,244
Fuel 35,244
Provisions 45
Personnel 10 days (on station)
Fresh Water 45

16. Factor Ending Patrol.

Orders of Combat Group 8.5 to terminate patrol and return Pearl via Midway.

17. Remarks.

The Commanding Officer can explain that he made no contacts by no other reason than that the shrimping was being routed to the south of Kiska Island.

The mental and physical alertness of the officers and members of the crew retrogressed more rapidly on this patrol than on the two previous patrols. This can be explained by the short period in port, during which time the officers were most and bested on board ship and it was possible to give only three days' messing and berthing for the crew at the submarine base barracks. Rearmament facilities were limited to movies, hiking and fishing, the latter two of which were denied during several days of inclement weather while this vessel was in port.

Due to the limited repair facilities available during the last refit period the vessel requires a large number of repair and inspection items, work requests for which are being submitted.

The officers and members of the crew should be granted an extended reorientation period for rehabilitation.

— page 55 —
1. The Commander Task Force Forty-two.
To: The Commander in Chief, United States Fleet.
Via: The Commander South Pacific Force.

Subject: U.S.S. GATO (SS212), Third War Patrol, Comments On.

Enclosure: (A) Copy of subject patrol report.

1. Enclosure (A) is forwarded herewith.

2. This war patrol was the third for the GATO and the first for the present commanding officer.

3. Few contacts were made and only one could be closed sufficiently to fire torpedoes. Four torpedoes were expended on the only attack made and were fired on generated bearing four minutes after the first attack. A speed spreading was used and one explosion was heard 40 seconds after firing. Considering the facts that enemy counter-action precluded observing results and that last contact observation was made with target five degrees on the bow at 1000 yards range, no damage to the 8,500-ton vessel of the COYO MARU type can be credited.

4. The indication of other radar beams noted was probably from other friendly submarines in the adjacent routing lanes.

5. The GATO returned in very good material condition and will be overhauled by the FULTON (AS11).

DECLASSIFIED-ART. C445, OPNAVINST 5510.1C

DISTRIBUTION: 2-0-2022 DATE 26/12/22
VONO, Cinepac,
Cincinat, CSVFP,
CSAF, CSPF, CSSVFP,
CSS 8 & 10, CSD 81,
Each SS TF42 (not to be taken to sea, BURN),
CTF42 War Diary,
CTF42 Patrol Summary File,
CC GATO File

DECLASSIFIED

— page 56 —
U.S.S. GATO
Subject:  U.S.S. GATO - Report of Third War Patrol - Period
from 5 November, 1942 to 23 December, 1942.

Area:  Northeast and Southeast  Operation Order: ComSubPac secret des-
of New Ireland.

PROLOGUE:
Gato arrived Pearl Harbor on October 2, 1942. Commenced refit on October 3, 1942, by tender repair forces assisted by Submarine Base personnel. Completed refit and ready for sea October 27, 1942. 3rd Radar installed. Twenty million meter mount installed. Battery outboard exhaust valve and battery exhaust hull valves removed. Two training period of three days each were permitted, the second being primarily for the benefit of the new commanding officer who arrived at the station after the first training period was completed. (Commanding Officer, Executive Officer, and third officer were detached).

1. Narrative.

November 5, 1942
0900 (W)
Underway from Pearl Harbor. Escorted till dark by TAHOE. Haking training dives daily. Training in battle surface, firing allowed ammunition with 3 in. and 20 mm. at home made targets. Training in clearing bridge, running silent, rapid pursuit, etc. Developed leak at 200 feet in newly blanked off battery induction hull valve casting. Repaired on surface by taking up on nuts.

November 8, 1942
0100 (X)
Received ComSubPac 080217 directing Gato to go to assistance of a PEY, down near Johnston Island. Proceeded at four-engine speed.

0700 (X)
Passed through PEY's first reported position and headed for her RDP reported position, still at four engine speed.

0745 (X)
A patrol plane passed Gato three miles abeam to port, on same course and mission. Exchanged recognition signals.

1245 (X)
Received ComSubPac 082220 giving new position of lost plane. This point was 48 miles directly toward Johnston Island from us. Headed for it, still at best four engine speed.

— page 57 —
U.S.S. GATO - Report of Third War Patrol.

November 8, 1942 (Continued)
1330 (X) Received ComSubPac 082651 asking our present position and E.T.A. above point. Replied.
1602 (X) Passed through last given position of plane. Nothing in sight. Continued on, planning to describe 30 mile circle.
1630 (X) Search called off by ComSubPac. Plane has succeeded in taking off. We are directed to proceed in accordance with original orders. (Gato is now 24 hours behind the original schedule and 6000 gallons anotter on fuel than yesterday).
1640 (X) Set course to resume assigned track, slowing to economical two engine speed.

November 10, 1942
1200 (Y) Gato passed to the command of Commander South Pacific. Changed radio guard accordingly.

November 12, 1942
0400 (M) Increased to economical three engine speed, to take best advantage of coming period of darkness in passing Hill Island, known to be a Japanese air base. At a point 235 miles, bearing 073°(T) from Hill Island, a heavy bomber glided from high clouds directly at stern, directly over Gato when seen. Made quick dive. One depth bomb exploded as Gato was passing 80 feet with hard right rudder. No noticeable damage. Steadied on course 90 degrees to right of diving course.
216 (M) Second depth bomb. Boat shaken up slightly but no damage found. (We were passing 140 feet enroute 175 feet).
1400 (M) No further attacks. When periscope and radar disclosed nothing, surfaced and proceeded at three engine economical speed. It is planned to reach the Hill-Makin line prior to daylight tomorrow. On surfacing, found that bow planes would not rig in, and bridge diving alarm was short-circuited.
2000 (M) Received first message from COMTRASKPOR 42, assigning Gato task unit designation and directing acknowledge-ment with position when prudent.

November 13, 1942
0530 (M) Submerged. Conducted high periscope patrol while passing between the Marshall and Gilbert Groups. No surface traffic, surface patrol or aircraft sighted. Surfaced and proceeded.

— page 58 —
1. U.S.S. GATO
Subject: U.S.S. GATO - Report of Third War Patrol.

November 14, 1942
It appears that one of the strip ciphers now in use by ComTaskFor 42 has been altered by a strip eliminator system. This change has not been received by Gato. Although it has been possible to solve his messages to date, it is conceivable that some important communication in the future may be unintelligible. Feel that this situation must be told to CFF 42 and that this is the most suitable location from which to do so.

0350 (N)
Informed ComTaskForce Forty-Two of the above circumstances.

November 15, 1942
Received Area assignment from ComTaskFor Forty-Two (this 150248), altered course to 270°T.

0930 (L)
On surfacing from training dive sighted small plane bearing due south on course 270 (parallel to Gato), distance about 8 miles. Dove. Do not believe he saw us.

0952 (L)
Periscope and Radar showed no activity. Since we are on the direct line between the Solomons and Ponape, it seems possible that this plane is the air coverage for an enemy force going or coming. Therefore, conducted high periscope and radar patrol across this line throughout the day.

1719 (L)
Surfaced, proceeding on two engines.

November 17, 1942
Lighted smoke bearing 270. Succeeding puffs appeared to draw nearer and moved slowly left. Decided his course was easterly.

0910 (L)
Submerged to commence approach on 265°T, but smoke drew away to south and could not be discerned through periscope.

0946 (L)
Surfaced. Rapid pursuit on course 220°T. Thereafter, the occasional puffs of smoke drew to the southward. Decided ship was on course 58T, too fast and too near his destination to be overtaken. Resumed course for assigned area.

2000 (L)
Entered area 5(N), and turned south on eastern border. Changed course to 235°T, to obtain fix on TANGA Islands.

2230 (L)
Sighted four ships coming out of squall on starboard quarter. Bearing was 110°T, angle on bow 90° port. The range was estimated at 12000 yards. Commanding officer identified them as destroyers. Cato was exactly in the path of the moon (full) from them. Their course estimated at 020°T.

— page 59 —
1942
U.S.S. GATO
Subject: U.S.S. GATO - Report of Third War Patrol.
November 17, 1942 (Continued)
2233 (L)
Came left to course 140°T (toward targets but
slightly astern), reasoning that surface chase on
this flank was impractical. Planned to cross astern
and endeavor to overtake on dark side.
2237 (L)
Just as Gato steadied on new course, distance
appeared to decrease rapidly. Nearest DD (a 4 stacker)
had an angle on the bow of 70° port, turning toward
Gato.
2240 (L)
Divided and turned left to 350°T. Destroyer was
pinging on 18 Kc. (long count), but could not be
seen through the periscope.
2353 (L)
Surfaced and could find no vessels by sight or Radar.
Resumed patrol.

November 16, 1942
0147 (L)
Received OTP 42 despatch 170849, notifying Gato of
coming of last night's contact.
Patrolled southeast of area (E).

2313 (L)
November 20, 1942
Received 24, 1942
0100 (L)
At northern limit of assigned area turned east, to
cover northeast corner of Gato's area, which lies
on the Buka-Truk line.
1930 (L)
Received Subs. 42 Serial 3 Cast, which directed
Gato to shift south to area Z after sunrise tomorrow,
and to cover the Rabaul to Buka and Shortland lanes.
Set course and speed to comply.

November 26, 1942
1400 (L)
Entered area Z and steered southerly courses conforming to coast line, to reach a point close enough to
Cape St. George to be in sight of both the Buka and
Shortlands traffic area.
1950 (L)
Received Subs. 42 NR 6 Cast, mentioning vessels due
at Shortlands at 0700 (L) tomorrow. They would have
to be well clear of our area by now.
2140 (L)
Received Subs 42 NR 4 Cast giving information on
traffic from THUK to RABAUL November 27, 30 and
December 5.

— page 60 —
1942
U.S.S. GATO
Subject: U.S.S. GATO - Report of Third War Patrol.
November 27, 1942
0200 (L)
Reached spot bearing 150°T, distant 12 miles from Cape St. George. Commenced maneuvers to maintain it and to determine the local current. Before dawn, encountered the following:
(a) "Idle rip which threw the boat 15° off course before it could be countered. (This turned out to be a common occurrence).
(b) Subterranean (or subaquous) noises which sounded exactly like small boat screws. True bearing remained constant. Later they were supplemented by the squeals which often mark schools of fish. (Another common occurrence).
(c) "Hammer blows on the hull". These were reported by the forward torpedo room watch.
(d) An oil slick which paralleled our course for several hours but which never revealed its source.

November 28, 1942
2206 (L)
Received Subs. 42 NR 7 Cast, promising an escorted unit from Rabaul to Shortlands, due on morning of thirty November.

November 29, 1942
Closed St. Georges channel and patrolled station which allowed constant survey of its entrance. No traffic was observed.
During the night patrolled on northwesterly courses across the probable tracks from Rabaul to Shortlans.

November 20, 1942
Took up submerged patrol on east-west line four miles south of Cape St. George. This station provides an excellent view of the channel and both its shores. On surfacing opened out to southeast along the (estimated) Rabaul to Buka route.

December 1, 2, 3, 1942
Patrolling the Rabaul-Buka-Shortlans traffic lanes in vicinity of Cape St. George.

December 4, 1942
0322 (L)
Sighted unidentified vessel bearing 250°T (own course 260°), estimated range 8000 yards. Changed course to 050°T, and commenced tracking.
0333 (L)
Target course determined to be easterly. Tentatively identified as a destroyer. Gato commenced approaching on course 220, working up to full speed.
0343 (L)
S.J. Radar picked up the target, giving the bearing 343 relative, range 7760 yards. By this time, angles on the bow were discernable and target was definitely identified as a destroyer.

— page 61 —
U.S.S. GATO - Report of Third War Patrol.

December 4, 1942 (Continued)
0352 (L)
0406 (L)
0420 (L)
1632 (L)
1741 (L)
1743 (L)
1748 (L)

Game left to course 135, but target (which plotted 19 knots) drew to the left.
Changed course to 090°T. Range and bearing remained constant (Gato making 19 knots at the time).
Although the approach was finished, the course and speed were continued for a short time to check the Radar against the pelorus and to note the visibility conditions with regard to the monostreak.
When target eased into the monostreak, instead of becoming more distinct, it disappeared entirely at 7800 yards. Conclude from this and previous observations, that when the moon's altitude is above 45° its path hinders visibility when target is over 6000 yards in direction of the moon. There seems to be a glare or haze which absorbs the target.
Reversed course to place Gato between Cape St. George and the destroyer, acting on the possibility that it was meeting some unit for escort to Rabault.

Observed, through periscope from a distance of about 8 miles, a patrol plane of the KAWAIISHI, four-engine type. It passed over Cape St. George and disappeared to seaward on course 125. Altitude about 200 feet. A Kawanishi patrol plane, probably the one sighted this forenoon, was seen dead ahead on the first exposure of a periscope observation. It was close to the water, and gliding (propellers were barely rotating). The periscope officer could not be certain whether or not it was turning toward Gato. The angle on the bow was about 40°. Went to 100 feet. No bombs were dropped.
Periscope observation. A heavy cloud of black smoke was visible, over the horizon, bearing 160°T. Changed course to 145°T, went to battle stations. Observed masts of two cargo ships hull down. The sea was absolutely flat and glassy with not the slightest ruffle.
As the range decreased, a screen of three destroyers became evident. One destroyer patrolled station ahead of the two merchantmen (or naval auxiliaries). The other two destroyers maintained station approximately about four goal post masts, one stack. She was estimated at 9000 tons. The foremost and aftermost goal posts were each surmounted by a single vertical mast with a cross-tree. She was light in the water. The commanding officer was unable to give the second merchantman more than a few passing glances. She was much smaller, probably 4000 tons. The formation was zigzagging. Angles on the bow of the

— page 63 —
1920 (I)
(1) The JK sound gear failed electrically, and when repaired, was too noisy in training for any but the slowest speed.
(2) The starboard rudder ram developed a load noise where it rubbed in the packing.
(3) The steering motor became noisy.
(4) A slight oil leak developed in the fuel oil transfer line, forever, and the engine room.
(5) The bridge diving alarm circuit was broken.
(6) A few electric bulbs were broken.
(7) Spring on engine room hatch broken.

As soon as the above attack was completed the destroyers opened out and took station for another approach. This time, however, it appeared that the Gato had worked far enough away to be outside their triangle. Although the pinging was heard until 2103, no further attack developed.

Commented: 2103 (I)
(1) The Gato had worked far enough away to be outside their triangle. Although the pinging was heard until 2103, no further attack developed.

2103 (I)
(1) The Gato had worked far enough away to be outside their triangle. Although the pinging was heard until 2103, no further attack developed.

2205 (I)
(1) The Gato had worked far enough away to be outside their triangle. Although the pinging was heard until 2103, no further attack developed.

2220 (I)
(1) The Gato had worked far enough away to be outside their triangle. Although the pinging was heard until 2103, no further attack developed.

2250 (I)
(1) The Gato had worked far enough away to be outside their triangle. Although the pinging was heard until 2103, no further attack developed.

2242 (I)
(1) The Gato had worked far enough away to be outside their triangle. Although the pinging was heard until 2103, no further attack developed.

December 7, 8, 9, 1942
(1) Torpedoes in forward tubes were serviced.

December 10, 1942
(1) Patrolling across the Rabaul-Shortlands-Buka routes on North-South courses near the center line of assigned area. At 2100 (I) on 8 December in Latitude 5° 02' S., Longitude 155° 26' E., sighted what might have been a white or pale green flare. A cautious coverage of the vicinity failed to disclose any source. Probably a shooting star.

In latitude 05° 06' S., Longitude 155° 22' E., the officer-of-the-deck observed black object in the haze, estimated 600 yards, on port beam, it resembled the coming tower and forward section of a partially submerged midget submarine. Tail was turned toward it, and stern tubes prepared. Neither radar nor sound gear could detect anything. Courses were changed to give observer sound reception and the area was cautiously approached and crossed but no further contact was made.

— page 64 —
U.S.S. GATO - Report of Third War Patrol.

December 14, 1942
0655 (L)
In position Latitude 45° 57' S., Longitude 152° 45' E., sighted smoke bearing 232°T. By exposing about 10 feet of periscope made out stick masts. It drew to southward. Normal approach course at 6 knots failed to lose, and smoke passed out of sight on bearing 151°.

2135 (L)
In Latitude 05° 17' S., Longitude 153° 06' E., (29 miles from Cape St. George) the SD radar picked up a plane and another radar. The plane moved in and out at ranges from 16 to 11 miles. The other radar, which was apparently directional, swept across our bearing at intervals varying from 10 minutes to an hour. The plane's image was last seen at 2225. The radar beam last swept across our screen at 0034. Our SD was kept manned throughout the night. During this period the 3J radar which is manned continuously, detected nothing. Note: - The SD radar is not manned continuously at night as a rule. It is tested nightly and used to determine navigational ranges. Therefore, this strange radar may be used by the enemy nightly. Further searches will be made.

December 16, 1942
2006 (L)
The SD radar picked up a plane distant 14 miles. It appeared to move out to about 5 miles then its image disappeared from screen. Note: - No strange radar was indicated tonight or last night but this is not conclusive as the equipment was not functioning well.

December 17, 1942
0637 (L)
In Latitude 05° 33' S., Longitude 153° 15' E., sighted masts of ship dead ahead (our course 217°T), distance estimated ten miles, angle on bow 90 starboard. Came right to course 280 and increased speed. Target continued to draw to right. Abandoned approach when angle on bow reached 130 starboard with range increasing. Ship had goal post masts. Saw no stack. No escort visible. Departed southwest corner of area as directed by Task Force Commander.

1903 (L)
December 18, 1942
0040 (L)
In Latitude 06° 49' S., Longitude 153° 52' E., SD radar picked up airplane distant 14 miles. Range decreased steadily. Made quick dive when range reached 5 miles. Before radar mast submerged range indicated was 3 miles. Made periscope observation. Saw nothing. Bright moonlight.

0119 (L)

— page 66 —
1240 (L)
: 1440 (L)
: 1520 (L)
: 1653 (L)
: 1245 (L)
: 0240 (L)
: 0747 (L)

: 1245 (L)
: 1520 (L)
: 1653 (L)
: 024

— page 67 —
U.S.S. GATO
Subject:  U.S.S. GATO - Report of Third War Patrol.

2. Weather, throughout the patrol, was very good. In Area Z the calms were too frequent for comfort.

3. Tidal Information.

In area Easy (Negat), a 9 day analysis showed an averaged current of 1.66 knots setting 112 degrees true. At the southeastern edge of the area, a few observations showed the current to flow 135°F. In the northeastern portion the current tended more to the east, the average direction being 098 degrees true.

In Area Zed, eighteen of the twenty-one days were spent at the junction of traffic lanes southeast of Cape St. George, from 5 to 25 miles from the point. There the average current was found to flow 212 degrees true with a velocity of 1.12 knots. It never appeared to vary to any extent from day to day. However, up tides were numerous in this portion, requiring 15° rudder to hold the boat on her course, surface or submerged.

This current decreased as the distance from Cape St. George increased, and a few observations in the southeast portion of the area showed it to be negligible.

4. Navigational Aids.

No navigational lights were observed during the patrol. Cape St. George light was not burning.

— page 68 —
5. Enemy Vessels Sighted.

| Contact | Date       | Description | Course | Speed | Lat. S. | Long. E |
|||||-------|||
| 1       | 2230(L)    | Nov. 17    | Sighted | 4 ships | 350°   | 12     |
|         |            |             |        |        |        | 15°    |
|         | 0322(L)    | Dec. 4      | 1 DD   | 000°  | 19     | 04°    |
|         |            |             |        |        |        | 56°    |
|         | 1741(L)    | Dec. 6      | 2 Aux. with | 3 DD | ZIG  | 14     |
|         |            |             |        |        |        | 05°    |
|         | 0653(L)    | Dec. 14     | Masts only | SE | 12     | 04°    |
|         |            |             |        |        |        | 57°    |
|         | 0637(L)    | Dec. 17     | Merchant or auxiliary | 307° | 15     | 05°    |
|         |            |             |        |        |        | 35°    |
|         | 0940(L)    | Dec. 18     | Masts and stack | 341° | ?     | 07°    |
|         |            |             |        |        |        | 36°    |
|         | 1030(L)    | Dec. 20     | Periscope | ?    | ?     | 13°    |
|         |            |             |        |        |        | 20°    |
|         | 1245(L)    | Dec. 21     | Periscope | ?    | ?     | 16°    |
|         |            |             |        |        |        | 32°    |
|         |            |             |        |        |        | 56°    |
|         |            |             |        |        |        | 30°    |

- 13 -

— page 69 —
7. U.S.S. GATO - Report of Third War Patrol.

Subject: U.S.S. GATO - Report of Third War Patrol.

No. Type Position Course Altitude Date Time Remarks
1 Navy PBY 16° 04' N 304°T. 1000 ft. 8 Nov. 1745(X) Engaged same search as Gato.
170°25' W

2. Indubstain 07° 15' N 241°T. 1000 ft. 12 Nov. 1206(M) Engaged in bombing Gato.
97 175° 45'W

3. Small 02° 10' S 270°T. 1500 ft. 16 Nov. 0930(L) Too distant to identify.

monoplane 160°35' E

4. Kawanishi 04° 55' S 125°T 2000 ft. 6 Dec. 1040(L) Patrolling.

4 engine 153°05' E Patrol

5. Kawanishi 05° 00' S Chang- 600 ft. 6 Dec. 1632(L) Patrolling or screening.

4 engine 152°58' E ing

6. Low wing 00° 43' S N.E. 1000 ft. 19 Dec. 1124(L) (Single Engine) monoplane 156°27' E

7. PBY (?) 13° 20' S Chang- 1500 ft. 20 Dec. 1136(L) ing

156°50' E

8. B-25(?) 13° 19' S 000° 1500 ft. 20 Dec. 1237(L) Could be Jap. PTAT 98 bomber.

156°49' E

— page 70 —
7. Summary of Submarine Attacks.

Attack number: 1
Date: December 6, 1942
Torpedoes fired: 4
Hits: One probable
Number sunk: Not observed
Number damaged: Not observed
Type of target: Prefighter or auxiliary.
Range: 1000 yards
Periscope depth: Yes
Estimated draft of target: 18 feet
Torpedo depth: 10 feet
Bow or stern shot: Stern
Track angle: 110 starboard
Gyro angle: 180
Estimated target speed: 12 knots
Firing interval: 6 seconds
Spread - Amount and kind: Speed, 2 knots plus and minus.
Remarks: Results not observed. One torpedo detonated 40 seconds after first shot. Target was larger of two merchantmen or auxiliaries escorted by 3 DD and air coverage.

— page 71 —
8. Enemy Anti-submarine Measures.

The method described herein was employed by three Japanese destroyers, in the search and attack on Gato, December 6, 1942. The initial position of the submarine was known within close limits. Air screen had probably sighted us, periscope had been raised in a flat calm, and torpedoes had been fired.

The destroyers opened out to form an equilateral triangle whose center was the assumed position of the Gato. (Their bearings from us were very close to 120 degrees apart).

Echo ranging was practically continuous. It was unhurried hand in ing, on frequencies of 14 and 18 Kc. The destroyers did not appear to stop and listen very often.

It appeared that the attack was withheld until the submarine position and track were well established. The target meantime was running silent and altering course at intervals. It seemed that, when the OCP was satisfied with the plot, a single designated destroyer proceeded in at moderate speed and delivered a pattern of charges on the determined position. The other two destroyers remained at a distance, and were heard pinging as soon as the disturbance subsided.

It is felt that the chances of their success would have been greatly increased if all three had dropped charges. Another search was commenced immediately. This time, however, the Gato was outside their triangle, as their bearings were all in the same semicircle. To had selected a base course which ran with the current, and this course caused the destroyers to draw aft. The pinging eventually faded out, well abaft the beam.

The commanding officer wishes to call attention to the fact that Lieutenant Commander G. K. Hae Kenzie, the Navigator, had carefully studied the current during our ten days in the area. It is felt that his solution of the current (greatly at variance with the sailing directions) was largely instrumental in the evasion.

9. No enemy mine sweeping operations were noted.

— page 72 —
10. Major Defects Experienced.

(a) Bow plane rigging derangement. The bow plane rigging equipment was worked on during the recent refit period by the U.S.S. SPERRY. They repacked the packing gland of the worm wheel shaft where it goes through the outer hull. In order to do this they had to lower the worm wheel casing from the overhead in the forward torpedo room. After the regular crew took over, adjustments had to be made on the limit switches as they were not properly set. During the training period out of Pearl Harbor and up until the bombing of 12 November, the rigging in and out of the planes was satisfactory. On surfacing after the bombing, the planes could not be rigged in. The rigging in motor was so overloaded it would slow down, then stop and kick out the over-load relays; and in hand power there was a very definite binding noise and finally a complete freezing up of the steering. A torpedo inspection showed all cases and shafting to be free. The lower half of the worm wheel casing in the forward torpedo room was removed and there was evidence of binding between the worm wheel and the worm. The angular contact thrust bearing, piece number "83" on Electric Boat Company plan #2062-70 was bound so tightly it would not rotate. The locking ring for the bearing was loosened, the bearing freed-up, the casing cleaned and the unit reassembled after the reassembly the planes worked satisfactorily.

The binding of this bearing had caused a misalignment between the worm and the worm wheel, causing this derangement. This may have resulted from the bombing or from reassembly during the refit.

(b) 3" Gun Derangement. While making adjustment to the 3" 50 caliber gun firing attachment, the part carrying the adjustment screw sheared off from the sear-lever rod, BuOrd. drawing #56070, piece No. 7. Examination of the parts showed a flaw in the casting. The two parts were strapped together with a brass "splint", and made operative.

11. Radio reception was complete. Last message sent: Gato 20156. Last message received: NR BL 025

12. A temperature reduction of 1° F. was found to exist between surface and 250 feet while evading destroyer attack on 6 December. This probably assisted in the evasion.

— page 73 —
13. Health was very good. No illness occurred. Several men were treated for boils. One man had a bone felon on an index finger. To improve habitability, CO² absorbent was spread at the beginning of each all day dive.

14. (a) Miles steamed enroute station: 3592
   (b) Miles steamed from station to Caloundra Head: 1446

15. Fuel expended: 82,707 Gallons.

16. Factors of endurance remaining:
   (a) Torpedoes: 20
   (b) Fuel: 10,560 Gallons
   (c) Provisions: 10 days (unbalanced)
   (d) Fresh water: Unlimited.
   (e) Personnel: 10 days

17. Patrol was ended in accordance with the date set by the Task Force Commander.

18. Remarks:
   (a) In view of the detachment of the Commanding, Executive and Engineering (third) Officers prior to this patrol, the Gato was fortunate in having Lieutenant Commander G. K. Hac Kenzie ordered on board for temporary duty. Acting as Executive Officer, Investigator and assistant approach officer, he left no doubt as to his ability and judgment. In the carefully considered opinion of the commanding officer, Lieutenant Commander Hac Kenzie is in all respects ready to command a submarine on war patrol.

   (b) Korale and performance of duty by both officers and men was of such a high order as to be extremely gratifying to the commanding officer.

— page 74 —
0035
S-B-C-R-E-T
CONSIGNEE
From: The Commander South Pacific Area and South Pacific Force.
To: The Commander-in-Chief, United States Fleet.
Subject: U.S.S. GATO (SS212), Third War Patrol, Comments On.

1. FORWARDED.
2. The ability of the submarine commanding officers to successfully evade depth charge attacks, the ability of the ships themselves to withstand the effects of such attacks, and the generally excellent material condition of the submarines during and on return from patrols continue to be a source of gratification to the Force Commander and reflects credit on responsible personnel.

3. The favorable remarks of the Commanding Officer about Lieutenant Commander Mac Kenzie's performance of duty are noted with pleasure.

Copies to:
VONO
Cincapa
Cincinnati
Comsowespac
Comsubpac
Comsubplant
Comsubsowespac
CTP 42
Comsubron 8
Comsubdiv 81
C.O., U.S.S. GATO

W. F. HALSEY
25
9
24

[Signature]
[Title]
[Date]

[Seal]
[Signature]
[Date]

— page 75 —
1. The Commanding Officer.
To: The Commander Task Force FORTY TWO.
Subject: War Diary, U.S.S. GATO, Fourth War Patrol.
Enclosure: (A) Subject War Diary.
(B) Track Chart.
(C) Time Plots of Attacks.

1. The war diary of U.S.S. GATO, covering the period from completion of the third war patrol to the completion of the fourth war patrol, is submitted herewith as enclosure (A).

2. Enclosures (i) and (c) are submitted in accordance with current instructions for submarine war diaries.

DECLASSIFIED
R. J. FOLEY.
DECLASSIFIED
BY: J. FOLEY
DATE: 5/26/42
47423

— page 76 —
1. Narrative.

Interval Between Patrols. Arrived Brisbane, Australia from third war patrol December 23, 1942. Refit accomplished by U.S.S.PULPION and relief crew of Submarine Division ZICHKY O.I.E. No major repairs or alterations were undertaken. Vessel was wiped in Brisbane River by personnel of U.S.S.PULPION. Instructions for current patrol are, briefly, "to conduct unrestricted warfare against the enemy in the areas surrounding the NEW COLONIA group of the SCHOOL OF ISLANDS until February 25, 1943, returning to Brisbane after patrol.

January 13
0800(L) Underway from alongside U.S.S.PULPION, and stood down Brisbane River.
1100(L) At mouth of Brisbane River conducted noise tests with sound bomb from U.S.S.PULPION. Discovered an excessive noise in number 2 I.C. Motor Generator, which would certainly have caused embarrassment.
1500(L) On completion of noise tests co-tit.used to sea.
1800(L) In vicinity of CALOUNDRA HEAD, joined HIAS VINDETTA, a combined training exercise as prescribed in operation order. Followed her turn swept channel and after a trim dive, made night approaches until midnight. This much needed drill is greatly appreciated. It is hoped that similar opportunity will be afforded at each departure.

January 14
0800(L) Commenced forenoon exercises with HIAS VINDETTA. Carried out exercises D-5 and D-6. On request, the destroyer dropped one 500 lb. depth charge at 500 yards distance.
1100(L) Made 300 feet test dive. Material completely satisfactory.
1300(L) Commenced daylight practice approaches on HIAS VINDETTA.

-1- EMC "A"

— page 77 —
1. Narrative.

Interval Between Patrols. Arrived Brisbane, Australia from third war patrol December 23, 1942. Refit accomplished by U.S.S.PULITON and relief crew of Submarine Division HIGHWAY. No major repairs or alterations were undertaken. Vessel was wiped in Brisbane River by personnel of U.S.S.PULITON. Instructions for current patrol are, briefly, "to conduct unrestricted warfare against the enemy in the areas surrounding the NEW COLONIA group of the SCHOOL ISLANDS until February 25, 1943, returning to Brisbane after patrol.

January 13
0900(L) Underway from alongside U.S.S.PULITON, and stood down Brisbane River. At north of Brisbane River conducted noise tests with sound boats from U.S.S.PULITON. Discovered an excessive noise in number 2 I.C. Motor Generator, which would certainly have caused embarrassment. On completion of noise tests co-ti.ued to sea. In vicinity of CALOUNDRA HEAD, joined HIAS VENDETTA, - of coalburned training carriers as reported in operation order. Followed her thru swept channel and after a trim dive, made night approaches until midnight. This much needed drill is greatly appreciated. It is hoped that similar opportunity will be afforded at each departure.

January 14
0800(L) Commenced forenoon exercises with HIAS VENDETTA. Carried out exercises D-5 and D-6. On request, the destroyer dropped one 500 lb. depth charge at 500 yards distance. Lade 300 feet test dive. Material completely satisfactory. Lade 300 feet test dive. Material completely satisfactory. Commoned daylight practice approaches on HIAS VENDETTA.

- 1 -

ENC "A"

— page 78 —
1915(L) Completed scheduled exercises. Destroyer gave us D.R. position and good wishes. Sho returned to port. Gato continued enroute to patrol area.

: 1915(L) Enroute patrol area. Conducted drills and training exercises. Pired 20cm and deck gun for training. Noon positions as follows:
   - Jan.15,1943 Lat.20-15-30 S.,Long.157-00-00 E.
   - Jan.16,1943 Lat.15-22-00 S.,Long.157-45-00 E.
   - Jan.17,1943 Lat.10-15-00 S.,Long.158-35-00 E.

: 1925(L) Submerged for the daylight period seventy miles south of NEW GORGIA.
   - 1635(L) Changed course to north and entered area "D".
   - 1955(L) Surfaced. Proceeding thru area "D" south, on two engines.
   - 2229(L) On reaching the line from the Japanese "NEW GORGIA" base to "GUADALCANAL", slowed to 5 knots and trimmed down, on chance of intercepting any cross traffic.

: 1931(L) Received Combatron Forty Two Number 44 B, directing Gato to proceed to the northern entrance of BOUGAINVILLE STRAIT. Went to four engine speed and set course to pass between BURAKU and RUSSEL ISLANDS.
   - 0435(L) An aircraft flare was dropped on our port boom distance about 4 miles. This was followed in about five minutes with another. The non-directional radar picked up a plane which closed from 6 miles to 4.5 miles.
   - 0445(L) Submerged and continued track toward Indispensable Strait.
   - 1200(L) Position Latitude 08-41 S., Longitude 160-23-30 E.
   - 1915(L) Surfaced between RAJOS and SANTA ISABEL. Proceeding at best speed to new station.

: 1915(L) Divd to prevent detection by an unidentified patrol plane which crossed ahead. Since our schedule requires only one hour more on the surface before dark tonight, remained submerged until just before local apparent noon.

: 1915(L)

— page 79 —
0

SECRET GATO - FOURTH WAR PATROL

---

**January 19 (Continued)**
1200(L) Position Int 06-19 S., Long. 156-55 S.
1228(L) Surfaced and proceeded at best 4 engine speed.
1546(L) Dived, to approach now station.
1956(L) Surfaced. Patrolling east-west line across BOT.
2215(L) Small patrol boat passed to northward on east-
   orly course, distant about six miles, pinging
   on 16 kcs. Passed out of sight without noting
   Gato.

---

**January 20**
0006(L) Sighted flashing lights bearing 326°T. They
   appeared to be rockets or flares.
0109(L) Small patrol boat appeared bearing 329°T, dis-
   tance 5 miles closing. Submerged to periscope
   depth. The boat passed us at about 700 yards,
   not pinging, and stood towards the SHORTLAND
   HARDOR entrance.
0203(L) Surfaced. Assumed patrol.
0243(L) Received ComTact for Forty two HR 57 B.

---

**January 21**
0335(L) Sighted patrol boat bearing 170°T distant about
  7 miles. Kept end on to him and he passed with-
   out detecting us. No pinging heard.
1200(L) Iron position: Latitude 06-13, Longitude 156-00 E.
1600(L) Sighted smoke bearing 319°T.
1607(L) As smoke drew to left, came to course 230°T.
1656(L) Shake appeared to come from several ships. Went
   to Battle Stations.
1710(L) Heard pinging on 18 kcs.
1730(L) Masts of ships appeared for the first time; Grad-
   ually made out a formation of four ships os-
   corted by two destroyers.
1810(L) The leading destroyer made a false contact ahead
   of the formation, hoisted a two-flag signal,
   speeded up and dropped one depth charge.

---

**END "A"**

---

**- 3 -**

**ENC "A"**

— page 80 —
1812(L) 1812(L) 1815(L) 1815(L) 1816(L) 1950(L)

January 21 (Continued)
1812(L) 1812(L) 1815(L) 1815(L) 1816(L) 1950(L)
Fired two bow torpedoes at second ship.
Fired two bow torpedoes at second ship.
The loading destroyer closed Gato making high
spread. Started for 250 feet.
(2 minutes and 20 seconds from the firing of our
"3 tube") One torpedo detonated. It was followed
by several smaller detonations.
Commenced evasive tactics and running silent.
Descrvoyers were using "sound bombs."
Fade periscope observation. One of the Harus
was burning violently. It was aflame for its
entire length. Flames were of manhood height
(100 ft.), but flared up every few seconds at
each end of "up to at least twice that height.
Flames continued until about 2215 when they
changed to a dull glow. This glow in turn dis-
appeared shortly. There is no doubt in the
mind of the Commanding Officer that the ship
was completely destroyed. Other information
indicates that it was a transport. (In morning
no ship was there, but small charred pieces of
debris were observed.)
Sighted a destroyer, bearing 237°.
One depth charge a long distance away.
One to course east and made two thirds speed,
to endeavor to clear the A/S search before our
battery was depleted.
Sighted a destroyer 2 miles, to northward. It
stood to the southwest without pinging or
changing course.
Surfaced and commenced charging batteries.

January 22 (Continued)
1950(L) 195

— page 81 —
0500(L) A "as heard to pass overboard. It was not
soon though the moon was bright.
0545(L) Submerged. Closing in on the entrance west of
CHINA ATOL.
: 200(L) Room position Latitude 6-24-00 S., Longitude 156-06W
1700(L) In latitude 06-28 S., Longitude 156-05 E., sound
heard screws baring 07E. It was Japanese sub-
marine of I 55 class, on surface distant about
5000 yards, course 195.
1705(L) Pired two bow tubes. The target turned parallel
to the torpedo tracks. No hits. The torpedoes
were heard to explode at 5 minutes 30 seconds
and 5 minutes and 40 seconds respectively after
firing.
2250(L) In latitude 06-27 S., Longitude 156-05 E., while
on surface at low speed, sound heard pinging to
northwest. Soon made out 4 ships inshore. Con-
maned approach on surface.
2305(L) Rooivd Submarines 42 RH 76 B, and laid it aside
for future decoding.
2312(L) Submerged when pilot indicated we could reach
attack position at slow speed. S.J. radar working
beautifully, picking up targets at 9000 yards.
Thore were three large ships and two destroyers.
2324(L) Tubes ready. Sound indicated one DD approaching
at high speed.
2327(L) Poriscope looked full into the searchlight of a
destroyer closing rapidly. Went deep receiving
3 depth charges error. Co.adder it fortunate
we were not rammed as we had come up to 40 feet
keel depth to expose radar. The destroyers then
successfully kept us down for three hours while
the convoy reached safety. During this time do-
cipherod Subs 42 RH 76 B, directing Gato to
sound off and evacuate to a new station.

January 24
0252(L) Surfaced on course east. Made 12.5 knots while
transmitting radio report. (Cato 241400).
0401(L) Changed course to 335°t and proceeded toward
new station north of KITA.
1200(L) Room position Latitude 05-53 S., Longitude 156-12 E.

January 25 Patrolling on course east on Latitude 6°-00 South.
0031(L) Dived to avoid what appeared to be the coming
tower of a submarine on opposite course passing

— page 83 —
1355(L) Stern plane casualty. See paragraph 9. Depth control regained at 135 feet, but creamed chip-ped beef covered galley deck. Controlling by bow planes only.
: 1650(L) Stern planes in commission.

January 26: Patrolling submerged during daylight.
: 1200(L) Hoon position Latitude 06-00 S., Longitude 155-56 E.
: 2053(L) Received Contaskifor 42 Serial 36D.

January 27:
: 0149(L) Smoke sighted bearing 302°t.
: 0201(L) Echo ranging heard on 18 kcs. Bearing remained almost constant, but smoke did not close ap-proximately. Reversed course and closed on surface. Raised out four large vessels and two destroyers, but there may have been more. Visibility was poor. No wave alarm on the tracel. (Lat.06-20 S., Long. 156-19 E).
: 0237(L) Div'd to await the approach. Distance estimated 6 miles. While range was still about 9000 yards, and the Gato at periscope depth, we were located by the escort, which now contained 3 destroyers.
: 0247(L) Went deep as one destroyer ran down our bearing at high speed. All destroyers seemed to alter-nately echo range, spaced up, and stop to listen then speed up again.
: 0300(L) As scows had only raking faded, started up. Covering had not yet passed our position. The escort to periscope depth was abruptly inter-rupted when a lighthouse buoy was abruptly inter-announced that the destroyer bearing 10° relative had spooked up and was "charging directly at us". Deep submergence was ordered, but when no at-tack dovo1oped and the operator continued his somewhat melodramatic reports, the sound re-ceiver was tuned on to the loud speaker. The reports were not justified. Started for paris-cope depth but critical time had been lost. (Although this man is removed from that in-portant post, he is not condemned. The sound man must say what he thinks he hears, and it is felt that the man's imagination was sharpened by fatigue or perhaps the strain of recent days.)

— page 86 —
1. On 30 January 30, 0458(L) BOMBING observed in vicinity of ZOUGAINVILLE STRAIT. Radar then tracked planes in toward ship from 11 miles to zero. Just as operator reported "It must be directly over us", the lights of 2 planes were seen close aboard, passing almost overhead. Their course was directly from the above mentioned bombing. One lookout was sure he saw U.S. markings.(Low grade report)./
2. 0550(L) Submerged. Daylight.
3. 0635(L) 3-gitched patrol boat #22 (yesterday's inefficient one) approaching to enter Bougainville Strait. As we were almost in his path, eased out and he passed 600 yards aboard. Studied him carefully to determine the advisability of destroying him. An convinced, from his performance of duty, that due would be aiding the enemy by removing him, since he probably gives them an unfounded feeling of security.
4. 1200(L) 1600 position: Latitude 06-07-30 S., Longitude 155-52 E.
5. 2315(L) On surface in hazy visibility, sighted usual patrol boat on his outbound leg. He passed a beam on opposite course (330°t) distance estimated 2 miles. It is only with a mental effort that due precautions are now taken on contacting this patrol. They are taken however. In this case, shifted to battery motors and turned carefully away, presenting no steam until he faded. He was not pinging.

January 31. Patrolling off east coast Bougainville, close enough to preclude passage of targets inshore.
1. 1200(L) 1600 position: Latitude 06-22-45 S., Longitude 156-03 E.
2. 1852(L) Patrol vessel passed 3 miles abeam without detecting Gato.
3. 2153(L) Received SUBS 42 Serial Three directing Gato to move North to Latitude 4°-00 S., and conduct surface patrol. Came to course 000 and proceeded at best 2 engine speed.

February 1. On surface.
1. 0900(L) Reached Latitude 04-00 and commenced surface patrol on east-west courses; Two engines(14.7 kts),

— page 87 —
1. (Continued)
2. 0900(L) zigzagging. Running four hour legs centered at 156° east.
3. 1200(L) Moon position: Latitude 04-01.5 S., Longitude 155-39 E.
4. 2153(L) Received SUBS 42 MR 60 calling for immediate shift to new stations. Gato assigned to cover eastern approaches to BUKA PASSAGE. This can only be done properly by being in the mouth of the passage, since it can be approached from a great variety of courses. Proceeded on four engines.

5. February 2
6. 0542(L) Submerged 6 miles from east entrance BUKA PASSAGE, and continued closing. Spent the day observing the entrance, sea approaches and the adjacent coastline. Chart appears quite inaccurrate, as to the shape of coast and location of mountain peaks, but Gato is not in position to give accurate corrections.
7. 1200(L) Moon Position: Latitude 05-32-30 S., Longitude 154-45 E.
8. During afternoon studied coastline. On the BUKA side, close to the east entrance is a group of newly constructed buildings which are not native type. On the BOUGAIIVILLE side, set well back, but projecting above the trees, is an object which could be a radar or signal station. Its top did not appear to rotate.
9. Two groups of white tents are located about 4 and 6 miles north of the passage, on the BUKA coast. They are at the sea level rather than at the bottom. Low bluff which follows the coast.
10. Atop the bluff are what appear to be native shacks by the hundreds. None look new.
11. In a few spots the foliage appears artificial, somewhat like the camouflage used by our army around OAHU, but this impression may be due to unfamiliarity with the local plant life.
12. A single engine monoplane, circled over the passage, had no float, and if he had wheels they were folded. Otherwise resembled IITSUISHI type 97 observation and light bomber.
13. Brush fire on Bougainville coast 7 miles east of BUKA PASS, will assist materially in our surface navigation tonight.

- 11 -

ENC "A"

— page 88 —
1943(L) During night lights showed at irregular intervals and for irregular periods where the camps and native houses are located.
2300(L) Contaskifor 42 NR 12 directs us to remain here looking for erripples.

: 0507(L) Searchlight beam (vertical) was shown at BUKA PASSAG 3 for about 37 minutes.
1030(L) Sighted observation plane bearing 220, distance 5 miles(over Buka Pass) circling as for a landing.
1200(L) Jgon position: Latitude 5-20-00 S., Length 154-47 E.
2327(L) Received SUBS Pour Two Serial One Pour, moving boats to new stations. Gato assigned channel between ONTONG JAVA and RONCADOR RIDER, to patrol on surface southward of the former.
2352(L) Sighted plane burning lights over BUKA PASS.

: 1200(L) Noon position: Latitude 05-31 S., Longitude 157-31-30 E.
1915(L) (At about 20 miles fromnearcast island of ONTONG JAVA GROUP) A strange radar beam swept across the screen of our SD RADAR. This was repeated several times.
2015(L) Arrived at point bearing 220, distance 6 miles from ONTONG JAVA and took up surface patrol. Will run 50 miles on course 130 and reverse. Scouting speed 14 knots.

: 0617(L) Strange radar again indicated on our screen.
0627(L) Radar picked up plane distant 17 miles. When it closed to 10 miles without being sighted, submerged for 20 minutes. Assume we must be undetected by enemy to be of any value here.
0908(L) Radar picked up plane at 15 miles. It closed to 14 miles then opened out. It was not sighted.
1200(L) Noon position: Latitude 05-55 S., Longitude 159-26-30 E.
1304(L) Sighted plane bearing 065°, distant about 8 miles on course 160°. Believe it to be B-17.

- 12 -
- ENC "A"

— page 89 —
5 (Continued)
1304(L) but not sure. Submerged for 23 minutes.
1402(L) Strange radar again seen on our screen.
1434(L) Plane sighted. It was a large patrol-type plane too distant to identify. Flying at about 10,000 feet bearing 180, course 280°. It passed into clouds at time when radar indicated 22 miles.
1440(L) Another plane sighted bearing 330°. This was quite definitely a B-17, course 175° (direction of Guadalcanal) height about 3000 feet. Passed 6 miles ahead. Probably saw Gato, as he swung slightly toward us as he crossed the bow, then resumed his course.

February C
0040(L) Received SUBS 42 Serial 22. Gato to remain on present surface patrol, but remain unseen in hopes the enemy main body will pass thru this channel.
Throughout the day patrolled line 45-225° at best two engine speed, observing OURNAL IAV with high poriscope at northwest end of run. Reversing course after 2 hours run to the southwest. No plane or ship contacts. Porleigh radar Swepc across our screen throughout the day.
1200(L) Moon Position: Latitude 05-35-15 S., Longitude 159-01-45 E.
2130(L) SUBS 42 NR 23 discloses that position of Japanese main body is not known.
2206(L) Casually to 3 main engine. Details in Par. 9.

February 7
0606(L) Patrolling on surface exactly as yesterday. Radar picked up plane 4 miles away. Ceiling appeared to be not over 100 feet. Weather rainy and blustery. Did not dive. Figure this must be a low storm and plane is over it. The plane passed overhead, but was not visible. Just as it was fading from the radar screen another plane passed, distant 7 miles.
1200(L) Moon Position: Latitude 06-00 S., Longitude 159-18 E.
1548(L) Sighted large four-engined patrol plane, similar to NAVALISHI Type 97 flying boat, on southerly course distant 6 miles. Lade quick dive. While diving, radar picked up above plane, distant 6 miles.
1635(L) Surfaced.

- 13 - UNC "A"

— page 91 —
0

SECRET GATO - FOURTH WAR PATROL

---

February 12
Proceeding toward Bougainville Strait, on surface except for dawn trim dive.
1200(L) Noon position: Latitude 04-56-15 S., Longitude 155-59.2 E.
1619(L) Sighted Bougainville Island (mountains at 5.5E, end) bearing 190°.
2101(L) Twenty miles due north of OMA IS., approaching the entrance. The land was covered with a hazo. Half moon near the meridian. Three destroyers came out of the haze approximately 4 miles away, bearing 140°T, in column, course about 000°T. Although silhouetted by the moon, we were nearly on end on an end of felt that we might be unsaved. Gangs to course 140°T and got tubes ready. Divod on that course. As we dived the two leading destroyers made smoke and scanned to turn toward us. Through the periscope one target was very clear. Another was heavy and had opened out to his loft. The third could not be seen. The clear one was on a course to pass about 1000 yards aboard. Commenced swinging this necessary 70 degrees for a storm shock. Had just started this turn when a pattern of depth charges was placed close to the data. This must have been the third destroyer. Vast to deep submarine. A ragged pattern of depth charges followed. A single destroyer commenced on the range. Normal evasive tactics were employed.
2132(L) Pinging coast, scows faded. Planed up slowly to periscope depth, looking in sight.
2228(L) Surfaced and continued toward OMA ISLAND. Re-celved SUDES 42 HR 45.

---

February 13
Patrolling southeast coast of Bougainville, northeast of OMA ISLAND.
1200(L) Noon position: Latitude 06-16 S., Longitude 156-00 E.
2145(L) Sighted 3 DD's coming out of entrance, bearing 150°T, distance 4 miles, course estimated 540°. Came to approach course. Divod. (This is now considered too early, but at the time it was considered necessary to prevent detection). Targets were visible for short time in periscope and were lost in a wide rain squall. Sound conditions seemed poor, but indicated in general that the scows passed to the northeast at high speed. Surfaced and resumed patrol. Rapid pursuit not considered plausible.

---

- 15 -

---

THE "A"

— page 93 —
15 (Continued)
February 15 (Continued)
February 16
0000(L) Jockeying to obtain attack position on tanker.
We and the target were passing thru frequent rain squalls.
00030(L) Target failed to emerge from one rain squall.
Gato took position on his projected track, trimmed down to dock awash, slowed to steerageway and waited.
0040(L) When target did not appear, decided he had been abled to use some reserve speed and pull ahead.
Plotted his 0330 position on that assumption and proceeded there at maximum speed.
0330(L) No target was found. Defaded he must have entered KIRTA which was beam when he disappeared.
0406(L) Commanded working back the coast to intercept if he comes out.
0609(L) Submerged and followed the coast toward KIRTA.
1200(L) No position: Latitude 05-40 S., Longitude 155-20-30 E.

February 17
0915(L) Patrolling off OEA ISLAND, Bougainville Strait.
Zeo ranging heard on sound gear. No surface craft appeared. The same was heard at irregular intervals throughout the day. It came from inside the channel.
1200(L) [Con position: Latitude 06-27-45 S., Longitude 156-04-15 E.
1300(L) Periscope 12 is commencing to get foggy.

February 18
0112(L) Patrolling off OEA ISLAND, Bougainville Strait.
SJ radar picked up a momentary target on 0305, which disappeared immediately. Almost simultaneously (and independently) one lookout saw what was believed to be a periscope bearing 0400.
Put tail to it. No screws could be heard. No further indications. Ziggaged thereafter.
Once each hour we pass thru the spot where our last attack was made. A stream of fuel oil starts from this point and goes down current. This may account for our periscope fogging yesterday.

- 17 - SNC "A"

— page 94 —
1200(L) Noon position: Latitude 06-27-35., Longitude 156-04 E.

February 19: Patrolling Northwest of CHINA ISLAND.
0216(L) Three aircraft flares were dropped over the SHORTLANDS AREA.
0237(L) Anti-aircraft fire in the SHORTLANDS AREA.
1200(L) Noon position: Latitude 06-27-35 S., Longitude 156-04 E.
1757(L) Sighted smoke deep in channel bearing 201°t.
1623(L) Stack of ship came in at 1h. Went to battle stations. Commenced approach. This was an orthodox approach except that the radiol course changes of the target required excessive speeds by the submarine, until the last leg on which the target came into excellent position for a stern tube shot (We have no torpedoes forward). Target was a 4 goal post auxiliary which we classed as an Air, although of course it might have been some sort of tender. Tonnage was estimated at 2000 tons. The escort is thought to be a CICIDORI class torpedo boat.
1955(L) Flood chute steam tubes. One torpedo struck near stern of target. She immediately veered about 70 degrees to her right, then swung slowly back. In about 3 minutes she started settling by the stern. The escort did not charge toward us for an appreciable time, but stopped and appeared to make a sweep with her sound gear. Then at 1941(L) she turned toward us and speeded up. The Cato started for 200 feet immediately. Before the portiscope went under, the target was observed to be sinking stern first with no list. He still had the poor deck above water, but it looked like it would be gone in about two minutes. Heavy black smoke (from the stack).
1942(L) First depth charge; not dangerously close. Five charges, not in a pattern, wore dropped.
1943(L) Minor noises and cracking up sounds came from the target. Started slowly toward periscope depth. Echo ranging indicated that the escort had lost us.

- 18 -

— page 95 —
2005(L) 19 (Continued)
2005(L) Periscope observation. Full noon near the zenith. Escort idling and pinging at the "scene", about 3000 yards away. No target in sight. Visibility estimated at ten miles. It is considered that we are justified in claiming that she sank (Only 22 minutes between observations).
2016(L) Put tail to escort, lowered periscope and ran for one hour on course 095°T. During this time the echo ranging seemed to draw to the south, toward the channel entrance.
2116(L) Nothing in sight. Escort had either entered the channel or blended in with the islands at the en- trance. Surfaced in "rapid pursuit"(missioner) on four engines. Remained on easterly course while clearing message to tactical force commander. This message reported our shortage of torpedoes.
2251(L) Radio transmission complete. Lade radical change of course to the northwest, doubling back toward Bougainville coast.

February 20 Closing cast coast of Bougainville.
C212(L) Received SUBS 42 Serial 63 directing us to return to port. Set course to follow prescribed route.
0820(L) Sighted turn periscope, INTUSUSHI type 97 obser- vation and light bomber, distant 3000 yards bearing 125°T, course 310°T.
1200(L) [No position: Latitude 05-25-00 S., Longitude 155-27-30 E.]
2327(L) Received SUBS 42 Serial 65 directing us to give time of passing latitude 2 south, and to go to BAIITAA POINT, REMODVA ISLAND to pick up two avi- ators. After estimate of times and distances, in- creased to three engine speed. This may get us there in time for a brief daylight survey of the boat on 22 February.

February 21 Proceeding south thru neutral lane west of SUKA and BOUGAINVILLE, on route RADOVA ISLAND to recover eviators. Submerged during most of daylight.
1200(L) [No position: Latitude 06-59-00 S., Longitude 154-00-00 E.]

February 22
0254(L) When due south of Shortland Island heading for REMODVA ISLAND on all four engines, received SUBS 42 NR 71 to "come home, aviators have been ros- cued". Changed course and slowed to more econ- onical speed to get back on return route.

END "A"

— page 97 —
1200(L) Noon position: Latitude 25-39-30 S., Longitude 125-26-30 E.
2127(L) Sighted Cape Norstrom Lt., bearing 275°t, distant 20 miles.

February 26
Entaring Brisbane, Australia.
0559(L) Picked up pilot near Caloundra Head.
0900(L) Loaded alongside U.S.S.Pulton, at New Farm Wharf, Brisbane, Australia.

- 21 -
ENC "A"

— page 100 —
5. Energy Ships Sighted.

Date: 4th Time(L) Lat.S Long.E Course Speed Description

Jan.19 2215 06-20 155-55 125 10 Patrol Boat (Soo ioto 1).
Jan.21 1730 06-13 155-58 130 12 3 AP, 1AK, escorted by 2 DD.
Jan.23 1700 06-28 156-05 195 12 Submarine of I-53 class.
Jan.25 2250 06-27 156-05 150 13 Convoy 3 AK or AP, 2 DD.
Jan.26 0031 06-00 156-00 270 8 SS (Possibly Inattl. 3)
Jan.26 0125 06-00 156-04 160 12 Unidentified (Hoped to be CA).
Jan.26 0225 06-20 155-55 140 12 Convoy of 4 Harus, 3 DD.
Jan.29 0703 06-18 156-03 160 16 AK or AP with one escort. (?)
Jan.29 1515 06-18 155-58 330 12 AK or AP with patrol boat.
Feb.12 2101 06-20 156-00 000 20 3 DD in column.
Feb.13 2145 06-45 156-05 340 20 3 DD in column.
Feb.15 2027 06-40 156-00 000 11 1 AK, 1 AO with 1 DD.
Feb.19 1823 06-31 156-00 080 11 1 AK escorted by Torpedo Boat.

Note 1: This patrol boat appeared to make nightly sweeps from Dougalinville Strait up the coast toward Kieta. He was seen nightly when we wore close to the reefs in this area. The time of his appearance varied nightly and his distance from the reefs varied from 1 to 6 miles. He never gave any indication of sighting or hearing. Gato, although he passed directly overhead on one occasion, and passed about 2 miles ahead while we wore on surface in poor visibility. He appeared to be a converted yacht, about 80 feet in length carrying a gun of about two inch caliber. About half the time he was pinging on 16 ke, long scale.

- 24 -

ENC "A"

— page 101 —
6. Aircraft Sighted.

Date: 4/3 Time(L) Lat.S Long.E Alt.f Course Identification

Jan.19 0913 03-20 156-59 2,000 170 Unidentified patrol plane.

Jan.20 1320 06-15 156-00 3,000 330 Single float OBS.

Jan.29 1035 06-18 155-58 2,000 Circling Single float OBS.

Jan.30 0202 06-07 155-52 1,000 310 Only lights seen.

Jan.30 0458 06-08 155-52 1,000 315 Lights of 2 planes.

Feb. 1 1551 05-30 154-40 1,000 Circling 1.ITSUBISHI 97 OBS.LB.

Feb. 3 1030 05-30 154-40 1,200 Circling 1.ITSUBISHI 97 OBS.LB.

Feb. 3 2353 05-30 154-40 1,000 Circling Only lights seen.

Feb. 5 1304 05-55 159-26 3,000 160 Probably B-17

Feb. 5 1434 05-50 159-20 10,000 280 Unidentified patrol plane.

Feb. 5 1440 05-50 159-20 3,000 175 B-17

Feb. 7 1548 06-05 159-23 8,000 180 KAWATISHI 97 Flying Boat.

Feb.20 0820 05-32 155-37 6,000 310 1.ITSUBISHI 97 OBS.LB.

Feb.22 1117 10-35 156-10 3,000 000 Heavy Patrol or Bomber.

Feb.22 1256 11-02 156-04 3,000 000 B-85

- 25 -

— page 102 —
7. Particulars of Attacks

Attack #1 On January 21, 1943, Latitude 6-12.5 S., Longitude 155-51 E., fired two torpedoes each at the two leading transports in a four ship convoy. One hit was obtained and an 8700 ton transport was set afire. Range: 1900 and 3200 yards respectively. Target draft: 25 feet(cast). Torpedo depth setting: 6 feet. Low shot: Track angle: On first target,110 Port; On second,85 port. Gyro angle: First target 34, second target 007. Target speed: 12 knots. Firing interval: 8 seconds. Spread: Voge 6 knots for 450 feet targets. Point of aim: H.O.T. Sound did not hear torpedoes. (Being concentrated on escorts.)

Attack #2 January 23, 1943, Latitude 6-28 S., Longitude 156-05.5 E. Two torpedoes fired at Japanese Submarine of the I-53 Class. No hits. Target saw and paralleled torpedo tracks. Range 2500 yards, target on surface. Gato at periscope depth. Estimated target draft: 17 feet. Torpedo depth: 3ot at 6 foot. Bow shots. Track angle: 130 Starboard. Gyro angle: 45° Estimated target speed: 12 knots. Firing interval: 30 seconds. Spread: Voge 4 knots. Point of aim: Coming tower. Sound heard torpedoes run. Both exploded at the end of attack.

Attack #3 January 25, 1943, in Latitude 06-00 S., Longitude 156-04 B. We had been promised a heavy cruiser at this point at this time. When a large and small lump appeared on the horizon, we came to an intercepting course at best surface speed. Weather was extremely variable. Past moving clouds alternately obscured and disclosed the full moon. Small rain squalls took turns in obliterating everything. The sea, however, was consistent in maintaining a good chop. When it became apparent that we would reach the firing position submerged, Gato dived at 0210(L).

— page 103 —
7. Particulars of Attacks (Continued)

Attack #3 (Cont’t)
The boat view of the targets was obtained at that time. They wore hazy shapes, but resembled in general the outlines of a cruiser and destroyer. However, at 40 feet, a 100-foot depth notching could be discerned with the periscope, radar or sound. The DC generated along, having been fed with an assumed course, speed and range, but actual bearings. The first thing to rise to the occasion was the phenomenal night vision of Lieutenant WARD, executive officer and ADC. Using the low periscope, he was able to get occasional life-saving glimpses of the target, when she C.O.(who considers his night vision at least normal) could see nothing. Squalls, however, soon removed the source of information. Sound and radar had, of course, been straining for the target. Next, the 3.5J. radar, manned by Lieutenant Jones, came thru with several readings, before it too faded out entirely. Those ranges and bearings were duly inserted into our TDC, and another blank period ensued. As the generated set-up showed no bearing to fire on, generated bearing, but at the last minute sound picked up the two sets of screens and was able to single out those of the large target. A final bearing was obtained and we commenced firing the 6-inch forward torpedoes, using a 6 degree divergent spread, at 6 foot depth setting, and all gyro angles between zero and ten degrees. Firing intervals were 10, 10, 17, 14 and 13 seconds. The track angle was 120 to 130 starboard, estimated target speed 11 knots. The range was 2500 yards, our keel depth 40 feet. Sound was able to track several torpedoes out until two of them hit and detonated at 1 minute 55 seconds and 2 minutes 00 seconds respectively, after the first firing. It was still impossible to see anything in the periscope and the approach of high speed destroyer across forced the Gato to go deep without over finding out for certain what she had hit.

Attack #4 January 29, 1943, Latitude 06-21.5 S., Longitude 155-04 E. At 1624(L) fired two torpedoes from stern tubes at 7200 ton auxiliary supply ship of the SITNA. HUN type. One torpedo hit under bridge. Range: 2100 yards, Gato at periscope depth. Estimated draft of target: 20 feet.

- 27 -

— page 104 —
7. Particulars of Attacks (Continued)

A: Attack #4 (Cont’t)
Torpedo depth set at 6 feet.
Track Angle: 110° Port
Gyro Angle: 100°
Estimated target speed: 11 knots.
Firing interval: 22 seconds.
Spread: Voge 6 knot.
Point of aim: 1.0, 0.1.
Sound heard torpedoes run.
Target sank 19 minutes after being hit.

Attack #5 On February 15, 1943, in Latitude 06-27.5 S., Longitude 156-02.5 E., in a night submerged attack, fired two torpedoes each at the two ships in a convoy. (Aik and AO, escorted by one D’). The Aik was hit (one torpedo) and sank in approximately-eleven minutes.
Range: 3000 yards.
Cato at periscope depth.
Estimated draft of target: 18 feet.
Torpedo depth setting: 6 feet.
Sound heard torpedoes run.

Attack #6 On February 19, 1943, in Latitude 06-27 S., Longitude 156-01 E., fired three stern torpedoes at an escorted auxiliary of 6000 tons. One hit was obtained about one-sixth ships length forward of stern. Target sank sometime between six and twenty eight minutes after the firing.
Range: 1500 yards.
Cato at periscope depth.
Combination day and night approach (noon relieved sun).
Estimated draft of target: 22 feet.
Torpedo depth setting: 6 feet.
Track angle: 118° Stbd.
Gyro angle: 000°.
Estimated speed of target: 3.5 knots (actually about 11 kts.
Firing interval: 10 and 16 seconds.
Spread: Voge six knot for 450 feet target.
Point of aim: 1.0, 0.1.
Sound heard torpedoes start out on correct bearing, but shifted to escort before the explosion.

- 28 -

ENC "A"

— page 106 —
9. Major Defects.

(a) Pitometer Log - Several gaskets, two gland seals and the bellows were ruptured when the pitometer log was blown down submerged. Spares were on board for all except one gland seal, which had to be improvised. Tried all sorts of rubber articles from the neck of the foot-ball bladder to less mentionable objects. Succeeded in manufacturing a satisfactory substitute after 6 days.

(b) Ship's Ventilation Supply Plow - When water was shipped in this valve (at 12th, January 23) the supply blower fan was wrecked. No spare is carried. Two portable blowers were rigged, and performed fairly satisfactorily.

(c) Main Engines - On starting #4 main engine, on 30 January, it fired, but was irremediably stopped because the inboard exhaust valve had not been opened. When the inboard exhaust valve was opened it flooded the engine, then, without proper precautions, the engine cut as well as the engine. The disassembly, the lamp running out of #9 unit, the engine, the lamp running out of #9

— page 108 —
10. Romark.

(a) Personnel: The ship went to sea with 65 men, or 4 men lost than the commanding officer considers necessary to operate at maximum efficiency. It was many times evident that a 4 man increase in complement would have paid tremendous dividends in the ability of the ship to properly carry out her mission. Specific details and examples will be taken up with our Immediate Superior in Command.

(b) Excellence of Refit: Lt. Condr., H.E. Brossy, USN, temporarily relieved the commanding officer, taking charge of the refit proceeding this patrol. There is now, at the end of the trip, every evidence that he performed a conscientious and painstaking job. He and his assistants in the refit crew and the tender repair force are to be complimented.

(c) Cato officers: The commanding officer is exceedingly proud of the officers. There is no better feeling than the supreme confidence that comes of moving that every department of the ship will perform exactly as desired when desired. This applies to every phase from the tug-master to the hull at the last depth to the correct solution of the torpedo problem, and runs the gamut of radar performance, navigation, navigation, engineering, and combatability and trim during attacks. This confidence has never been misplaced.

(d) Cato enlisted men: The crew performed all duties in an enthusiastic and (as the patrol progressed) capable manner. It must be admitted that each of the first few dives and approaches was an adventure. This because now men had to be placed on stations they had never manned. Enthusiasm and hard work soon overcame this. Now as the patrol ends, it seems a crime to partially break up a smooth-working, self-confident, eager fighting unit, whose morale and efficiency are definitely on the up grade.

(e) Health: No unusual sickness or accidents occurred. We had the normal number of Boils, cut fingers, constipation and our one seasick boy.

(f) Factors of Endurance: We are self sustaining in fresh water. Provisions remain for 20 days, (12 days balanced diet). All fuel was consumed, as planned. Two torpedoes remained, and this fact caused the Task Force Commander to direct our return to port 5 days early.

- 32 -

— page 109 —
1. The Commander Task Force FORTY-TWO, Care of Fleet Post Office, San Francisco, California, February 28, 1943.

From: The Commander Task Force FORTY-TWO.
To: The Commander in Chief, UNITED STATES FLEET.
Via: The Commander, SOUTH PACIFIC FORCE.

Subject: U.S.S. GATO (SS212), Fourth V/er Patrol; comments on.

Enclosure: (A) Copy of subject patrol report.

1. Enclosure (A) is forwarded herewith. Its classification is hereby changed to "CONFIDENTIAL".

2. GATO's Fourth V/er Patrol covered a period of 44 days. She left Brisbane January 13, 1943, and proceeded between Florida and Santa Isabel Islands to her initial station at the northern entrance to Sombrerilla Strait where she arrived January 19th. In the late afternoon of January 21st she missed with two torpedoes at the lee of a four ship northbound escorted convoy but hit with one of two torpedoes fired at the second ship. The latter, a transport estimated at 8,700 tons, was a mass of flame for four hours and is considered destroyed. Two days later she made another daylight periscope attack on an enemy submarine, firing two torpedoes at 2500 yards range. The submarine sighted and maneuvered to avoid these torpedoes. Before dawn on January 25th, in poor visibility, she made a night periscope attack on a target believed by the commanding officer to be a cruiser with destroyer escort. She fired six torpedoes and heard two of them hit, but due to enemy countermeasures was unable to determine further results of the attack. Her next attack opportunity developed during early morning darkness on January 27th when she had sight contact with another four ship escorted convoy. Her experience in this case was abandoned after she had apparently been detected by one of the three escorting destroyers. This occurred at a range of 9000 yards with GATO at periscope depth using radar, and is another possible indication that deep ships are redder equipped. In the afternoon of the 29th, she sank a 7,000 ton northbound escorted freighter with one hit. Two torpedoes were fired. After a 12-day absence from this area occasioned by a major Jap force being sighted at sea south of Truk, she returned on February 12th. On the evening of the 15th she made a night submerged attack on a tanker and an 8,000 ton freighter northbound in convoy, firing two torpedoes at each

— page 111 —
1. Transport 8,700 tons,
Sunk 3 freighters, totalling 23,000 tons.
    Totel sunk 31,700 tons.

2. Undetected ship (probably a warship, possibly a cruiser).

DISTRIBUTION:
Cominch (Advence Copy)
VONO
Cinelent
Consublet
Consubpec
Comsowspec
Comsowsowspec
All SS TP42 (Not to be taken to sea - BURN)
CTF-42 Bort F11c
CSS-8
CSS-8
CSD-81
Oinc S/M School, H.L. Conn. (2)
CO GATO (F11c)

— page 112 —
3.01583
ab
MAR 10 1943
1st. Endorsement on
ComTaskFor 142 Conf.
Ltr. FF12-15(42)/Al6-3/
Fk, Serial 0101 of
February 28, 1943.

From: The Commander South Pacific Area and South
Pacific Force.
To: The Commander-in-Chief, United States Fleet.
Subject: U.S. GATO (SS212), Fourth War Patrol -
comments on.

1. Forwarded, congratulating the GATO on a
thoroughly satisfactory patrol resulting in the impressive
total of 31,700 tons sunk or destroyed.

2. On his second war patrol Lieutenant Commander
R. J. Foley, U.S.N., the commanding officer, has demonstrated
an efficiency and obtained results which compare most favor-
ably with the best submarine commanding officers of the war
to date.

W. F. HALSEY
Copy to: VCNO
CincPac
Cinclant
ComSoWesPac
ComSubPac
ComSublant
ComSubSoWesPac
CTF 42
ComSubRon 8
ComSubDiv 81
CO USS GATO

1935 MAR 22 12 30
REVIEWED
CONFIRMED
CONSIGNED
CONFIRMED
CON

— page 113 —
4 01212
FF12-15(72)/A16-3/Pk
TASK FORCE SEVENTY-TWO,
Case of Fleet Post Office,
Serial 0133
San Francisco, California.

C-O-N-F-I-D-E-N-T-I-A-L
March 29, 1943.

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

Subject: U.S.S. GATO, Fourth War Patrol.

Reference: (a) CTF-42 CONF. Ltr. FF12-15(42)/A16-3/
PK Serial 0101 of February 28, 1943.

1. In paragraph 5 of reference (a), GATO is credited with destruction of a transport of 8,700 tons. Information received subsequently indicates that the vessel destroyed was a freighter or transport of 4,560 tons.

DISTRIBUTION:
Comlink (Advance Copy)
VONO
Com First Flt
Com Second Flt
Com Seventh Flt (2)
Consubs First Flt
Consubs Second Flt
Consubs Seventh Flt
All SS TF72 (Not to be taken to sea - BURN)
CTF 72 War Patrol and Summary Files
CTF 72 Boat File
CSS 6 & 8
CSD 81 & 82
01nc S/M School, N.L. Conn. (2)
CO GATO (File).

— page 114 —
0581
Serial 0581
COMPSAC FILE
A16-3/(11)
SOUTH PACIFIC FORCE
OF THE UNITED STATES PACIFIC FLEET
HEADQUARTERS OF THE COMMANDER
APR 6 1943

C=O-N-F-I-D-E-N-T-I-A-L
1st endorsement on
CPF 72 Conf 1tr. Pfl2-
15(72)/A16-3/Pk serial
0133 of March 29, 1943.

From: The Commander South Pacific Area and South
Pacific Force.
To: The Commander-in-Chief, United States Fleet.
Subject: U.S.S. CAMO, Fourth War Patrol.

1. Forwarded. Records have been corrected
according to later information.

H. R. THURBER,
Acting Chief of Staff.

Copy to:
YOHO
Dinopac
Dinolant
Donsowespac
Donsubpac
Donsublant
Donsubsowespac
CPF 72
Donsubron 8
Donsubdiv 51
GO USS CAMO

— page 115 —
5 0636
Serial 03
U.S.S. GATO
(SS212)
c/o Fleet Post Office,
San Francisco, Calif.,
April 11, 1943.

From: The Commanding Officer.
To: The Commander Task Force SUBWAY TWO.
Via: The Commander Submarine Squadron EIGHT.

Subject: Patrol Report, Fifth War Patrol.

Reference: (a) Comstock for 42 Serial 01, of January 18, 1943.
(b) War Patrol Report, Fifth Patrol to time of interruption.
(c) Track Chart of subject patrol.

1. The fifth war patrol of this vessel was interrupted for repairs to damage received on April 4, 1943, on which date it became necessary to proceed to port.

2. Enclosures A and B cover the period from the completion of the fourth war patrol until the arrival at Brisbane for repairs on April 11, 1943.

R.J. POLK
DECLASSIFIED
DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY OP-09RRC DATE 5/26/42
48 7/3/43

— page 116 —
5 0636
GATO
CONFIDENTIAL
PITEN WAR PATROL
CONFIDENTIAL

1. Prologue - Interval between Patrols.

February 26, 1943. A 'normal refit was performed by 'relief' crew of subdiv 61 and Fulton repair force. Interim docking and wiping were included. No major items of overhaul were undertaken. Instructions on departure 19 March 1943 were to conduct unrestricted warfare against the enemy in the Solomons-Dismarels - New Guinea Area, with the additional special task of landing Lieutenant Jieenan (R.N.R.) and party on Bougainville with their supplies, and to evacuate 12 commandos and 12 civilians from the same point.

2. Narrative.

19 March 1943.

0900 (L) Underway from alongside U.S.S. FULTON, Brisbane, Australia.
1100 (L) Conducted sound test with FULTON Sound Boat off Pile Light.
1300 (L) Unable to conduct 3' target practice as target obscured. Called off practice and realeased towing vessel when we had to depart for next rendezvous.
1700 (L) Transferred Pilot to Examination Boat, and Commander Bruton, USN, to HIS GIMPI (Corvette), for training exercises. Proceeded to sea and conducted night approaches on GIMI.

20 March 1943.

0240 (L) Sustained casualty to No. 2 Main Generator. Details given in paragraph 10 (a). Informed O.C.P. (Commander Bruton) of intentions to continue patrol with 3 engines.
0800 (L) Commenced forenoon sound exercises with Corvette and made test dive to 325 feet. No uncorrectable leaks.
1500 (L) Conducted afternoon training attacks on Corvette.
1748 (L) Completed training exercises. Proceeding on patrol.
Noon Posit: Lat.26-22S., Long.154-10E.
'Distance run: 230 miles. Fuel Used: 2,104 Gals.

21 March 1943.

Enroute Bougainville. Heavy Seas. Our wooden boat is badly holed and several of its ribs are broken. Three paddles for securing the grips were torn from our hull. Now secured and we will- and-avior to patch it for the Bougainville landing.
Noon Posit: Lat.22-50S., Long.156-04E.
Distance run: 283 miles. Fuel Used: 3,484 Gals.

22 March 1943.

- 1 -

Enclosure A

— page 117 —
22 March 1943.
Enroute Bougainville.
Moon Posit: Lat.17-33.08, Long.156-29E.
Distance run: 341.1 miles. Fuel used: 3504 Gals.

: 23 March 1943.
Enroute Bougainville Island.
0205(L) Received CTP 72 serial 71 confirming arrangements for landing of our passengers at TETOP, Bougainville after dark 28 March.
1425(L) Passed float chamber of a catamaran type life raft, floating vertically. Painted light grey and some-what battered. Our relief gun pointers used up remaining 3ft target ammunition on it.
Moon Posit: Lat 12-428., Long.156-55.5E.
Distance run: 340 miles. Fuel Used: 3504 Gals.

: 24 March 1943.
Enroute TTOP, Bougainville, running submerged during daylight.

Contasikfor 72 in his serial 75 warns us of a daily routine patrol plane flying low over TTOP.
Moon Posit: Lat.9-018., Long.155-235.
Distance run: 312 miles. Fuel used: 2759 Gals.

: 25 March 1943.
Enroute TTOP, Submerged during daylight.
Moon Posit: Lat.06-15.58., Long.154-04E.
Distance run: 197 miles. Fuel used 2050 Gals.

: 26 March 1943.
North of BUFA, onroute TTOP, Bougainville.
2100(L) Received Comtaskfor 72 serial 82 with the report of a target but tells us to leave him, as well as any but major targets, alone until our special job is completed.
Moon Posit: Lat.4-383., Long.154-35E.
Distance run: 187.5 miles. Fuel used: 1941 Gals.

: 27 March 1943.
North of Cape Henpan. Before dawn worked on our damaged boat.
1905(L) On surfacing sot course for TTOP Harbor.
Moon Posit: Lat.04-465., Long.154-50E.
Distance run: 92 miles. Fuel used: 486 Gals.

- 2 -

Enclosure A

— page 118 —
5 0636
GATO
CONFIDENTIAL
FIFTH WAR PATROL
CONFIDENTIAL

28 March 1943.

Submerged at dawn 5 miles from TEOF entrance.
Observing:
1134(L) Sighted small merchant vessel coming down coast. Went to 100 foot and tracked him past by sound.
1246(L) Having decided that a hit entry into TEOF would jeopardize the mission, commenced a slow submerged entry.
1445(L) Lay on sand bottom of inner harbor in 115 feet of water.
1904(L) Had a periscope observation, not quite dark, there is a wooden vassel of 100 foot length anchored near the native village. No activity on board. No activity anywhere. Sattled back on bottom.
1922(L) Pull dark. Had periscope observation. No signal fires. A few lights visible in native village, plantation house, and on the wooden craft. Proceeded submerged toward channel whore we surfaced and stood out.
2003(L) Two bonfires appeared well up on the mountainside behind TEOF. Considering them our beacon, commenced reentry. In the dark, no light was seen. Could not turn steering. On TEOF to keep out of sight unless a ship was seen to leave and fire was soon. Could not turn before reaching inner end of channel. While turning (trimmed down and using only steerageway on motors) observed harbor and beach carefully. No indications that we were seen. Sea is hit as before visible. None in motion.
2130(L) Deported TEOF. On leaving channel cleared area to NE at high speed.
2600(L) An intertolerance appeared in radio receiver, similar to that caused by our own SD radar. Possibly a radar is tracking us.
2348(L) In a violent rainstorm. S.J. radar picked up a momentary "pip". Turned away at flank speed.
2350(L) S.J. Radar got another brief indication of ship close aboard. Visibility Hill. Had quick dive. No screws wore heard throughout the dive. Discovered that our negative tank flood valve leaks freely.
Noon Posit:Let:05-31.55., Long:155-07E.
Distance run: 115.9 miles. Fuel used: 500 Gals.

29 March 1943.

0044(L) .Surfaced. All clear. Sent radio message to find out if fires we saw wore signals. Then made radical change of course at high speed. Received CEF 72 Serie 90 toiling us to keep out of sight and try again tonight.

- 3 -

Enclosure A

— page 119 —
0540(L) Submerged off TTOP.
: 0541(L) Small steamer passed proceeding from direction of
: BUKA, toward KIZTA. Avoided him.
: 1905(L) Dusk. Stooped toward channel. Signal fire appeared
: on beach.
: 1916(L) Surfaced and stood into channel.
: 2022(L) Stopped close to shore aboard signal fire which was
: being doused. Lieutenant MacLean in one of our rubber
: boats' proceeded ashore to reconnoiter. In a native
: canoe, Lieutenant Read, R.A.N.R. came aboard. He
: has assembled 51 souls and sits that we take as many
: as possible. The group includes 27 children, 9
: mothers, 3 Wums and 12 A.I.F. commandoes. The number
: was a shock but decided we could handle them all for
: such a short trip. Commended embarking and discom-
: barding simultaneously. Our dinghy repair job was
: successful. Native canoes wore very helpful. Our
: rubber boats alone would have taken hours.
: 2122(L) Ready to depart. Nosed out to now familiar channel
: in pitch black.
: 2147(L) Clear of channel. Ran eastward at 4 engine speed,
: getting our passengers settled. All wore "troupers"
: and wore quickly adopted by this company. The
: adoption was reciprocal. Typical example -: One 10
: month old child would sleep no more but in the arms
: of a bearded torpedoman who named the telephone at
: the forward tubes. They made a viard picture on
: watch. Brief impressions of the GATo's incongruous
: family. (a) The children:- Through a cycle of awe,
: apprehension, mischief, ravenousness, and unwilling
: sleep. (b) The nothors:- Distraught, than trustful.
: (c) The nuns:- Boning and patient. (d) The soldiers:-
: "Haven't you some dirty jobs we can help you with"
: and "It's there any boor in Brisbane." (e) The GATO
: crew:- Clumsy but enthusiastic volunteer nursemaids.
: Noon Posit: Lat,05-31S., Long,155-03E.
: Distance run: 138,9 miles. Fuel used: 1422 Gals.

30 March 1943.

Proceeding to rondzoyous with sub chaser near Florida
Island. Fassongors getting along well altho tho
atmosphere becomes oppressive submerged. Used CO2
absorbent and oxygen, ran air compressors frequently.
1216(L) Surfaced briefly to change air in boat.
1300(L) Children discover that rotating sound gear makes
: excellent merry-go-round.
1930(L) Comtalskfor 72 serial 96 soots rondzovous at 0200(K)
: April 1, but offers to change it on request.

- 4 -

Enclosure A

— page 120 —
2030(L) In order that no may have enough darlmoss to clear tho
    rondozvous area, roqucstod rondezvous at 2030(K)
    tomorrow instoad of 0200(K) on April,1,(GATO dospatch
    300930).
    Noon Posit: Lat.6-103., Long.157-47E.
    Distance run: 2001.1 milos. Fuol usod: 2800 Gals.
    31 March 1943.

Proceeding toward Florida Island to rendezvous with
sub chasor. At dawn submerged off Indisposable Strait
Spont forenoon trying to penetrate burrior shoals
submerged. Method usod was to make baro stocracoway
at 72 feet koel depth (to pomit rising without breaking
surface.) Mon water under keel reached one fathom wo
would rotroat, pick a now spot and try again. In this
namnor, worked across whole strait without finding an
opening. Twice wo touched bottom. The second time at
the edge of the shoal just west of RAMOS island. In
backing off horo wo inadvertently broke surface.
Since it was non-flying weather, took advantage of poor
visibility and ran over tho shoals on the surface.
2030(L) Effocated rendezvous, one hour early, with 3C 531, and
commenced transfer of passengers and gear.
2120(L) Completed transfer and proceeded northward between
YABBL and RAMOS Islands.
Noon Posit: Lat.0-12.55., Long.160-07.22.
Distance Run: 207.1 milos. Fuol usod: 2076 Gals.
1 April 1943.

Proceeding north of YABBL and CHICAGO Islands,
toward now station. In order to reach a likely traffic
lane by tonight, remained on surface. Reasoned that
our discovery could only lead onany to false conclusions.
0750(L) Sighted plane (thought to be PBY) 6 milos astorn
coming toward GATO. Submerged for 32 minutes.
1015(L) Sighted another plane (possibly PBY but also possibly
Jap). Distant 12 mile bearing 260°T heading south.
He crossed ahead but then turned toward. Submerged
for 1 hour 20 minutes.
2342(L) Arrived at inshore traffic lane along NE coast of
Bougainville. Slowed to 6 Kts (for listening),
trimmed down and followed the coastline.
Noon Posit: Lat.06-13.05., Long.158-23E.
Distance run: 207 milos. Fuol usod 2361 Gals.
2 April 1943.

Following east coast of Bougainville from 6° latitude
to Cape Henpan.

- 5 -

Enclosure A

— page 121 —
1130(L) Looked in on BULA Passago from distance of 6 miles
No surface activity was seen. Continued northward,
following coastline.

: 1307(L) Noted plane circling BULA Airdromo, preparatory to
landing. Identified as medium bomber, Hitzubishi
96 or 97. On each periscope observation until 1525(L)
those planes wore seen over the passage. Total 5
planes. An aerofax we wore not observed.

: 1925(L) Surfaced east of Cayo Honpan and proceeded toward
East Cape, NEW IRELAND.
    Noon Posit: Lat.05-20S., Long.154-47E.
    Distance run: 26d.2 miles. Fuel used 2452 Gals.

: 3 April 1943.

: 0605(L) Submerged off East Cape NEW IRELAND heading toward
TANGA Islands.
    Surfaced. Proceeded west of TANGA Island. At this
time the S.J. radar failed. Because of the extremely
poor visibility this was considered a dangerous
situation. The radar officer and the material man
worked frantically on it.
    Noon Posit: Lat.4-15S., Long.153-22S.
    Distance run: 139.7 miles. Fuel used: 1023 Gals.

: 4 April 1943.

Proceeding between TANGA and LIHIN Islands in very
low visibility. There were numerous rain squalls
and haze patches. No results could be obtained with
the radar. Deciles of the radar casualty are given
in paragraph 10(e).

: 0256(L) A large vessel appeared out of haze on starboard
bow, on reverse of our course close aboard. Now
believe it was slightly over 2 miles distant altho
it seemed closer. An escort vessel appeared astern
of the target. One lookout believed he saw another
escort on the far (port) bow of target. Turned
away, ordered tubes ready and battle stations. Am
fairly certain we had not been sighted. Intention
was to open, circle around and make surface attack
from ahead, but during the initial turn the radar
officer turned on his equipment again and got a
range and bearing that looked good to the commanding
officer. Parallel to target and on his beam, but
it seemed we must be sighted any minute. Decided
to make submerged radar attack.

: 0307(L) Submerged. As commanding officer took initial look
through periscope he saw escort turning toward GATO.
: 0309(L) Started for deep submergence. Radar gavd escort's
range 1700 yards. Angle on bow was zero.

- 6 -

Enclosure A

— page 122 —
5 0636
GATO
CONFIDENTIAL
PIFTH WAR PATROL
CONFIDENTIAL

0311(L) First of three depth charges detonated as we passed 150 feet. The first one was practically a direct hit. The shock was violent and the vessel seemed to jump an appreciable distance. Fire extinguishers, flashlights and such items left their receptacles. Cork left the bulkheads and air could be heard leaking into boat. The most important immediate result was the loss of all power (propulsion, steering, diving planes, gyro, lights, etc.) this was caused by the simultaneous jarring out of both battery disconnect switches and all switches on the auxiliary power panel. Emergency lights functioned, hand control was achieved on steering and diving planes. The auxiliary circuits were closed immediately, giving lights, but planes and steering were kept in hand operation. Battery disconnect switches were closed and propulsion regained in time to catch the boat 360 feet. However, it already required high speed to keep the depth from increasing and water was being taken in continuously. Sound heads were forced up into the boat, making listening easier aft, and as water was shifted forward, heavy over all. Had to accept the danger of making noise. Pumped blow and increased speed. The after trim tank was obviously ruptured thru the pressure hull. The Commanding Officer is impelled to stop at this point to command Lieutenant Ward and Lockwood who collaborated on depth control. They overcame an impossible situation.

0348(L) Pattern of 3 depth charges which, compared to the last ones, seemed miles away. Succeeded in forcing sound heads out hydrodynamically. Our own noises proved satisfactory listening, however.

0420(L) Depth control is a losing fight. The many small leaks kept the boat heavy during flight. The many small leaks we were making 150 rpm (and the 3 hour discharge rate of our battery). Decided to surface while an hour of darkness remained.

0424(L) Roached 100 feet. For a brief interval stopped motors and pumps to listen. Heard nothing. Cannot believe onny would clear the area.

0436(L) Surfaced. No ships close at hand. A suspicious smudge was visibly on the eastern horizon. Headed west of north on the only engine that would start immediately. Commenced charging with auxiliary engines and companionate the boat. Very soon two more engines were started. They were placed on charge.

- 7 -

Enclosure A

— page 123 —
0544(L) Daylight. Submerged. Steered north-northwest course and took stock of our material condition. Damage is listed in paragraph 10(d). It became obvious that the feasibility of continuing the patrol without repairs was doubtful. Realizing the shortage of submarines on station and the importance of time, much thought was given to overcoming our defects or accepting some of them, in order to continue the patrol for a time at least. Depth control became, therefore, a difficult question. We can fire torpedoes forward, and can dive with reacannals speed, but after a careful study of the depth control possibilities the commanding officer decided to obtain repairs before continuing the patrol. The reasoning was as follows: (a) After trim, after VRT, and negative times are open to sea and must be carried full. They total 32,97 tons of water. (b) It is necessary to add 13.9 tons of water to forward trim to compensate for and aft. (c) The excess water is 24.2 tons above our normal trim. (d) Carrying safety tank dry, (uncomfortable but acceptable), we now have at periscope depth only 10.75 tons of variable water. At deep submarine the figure is 6.75 tons. This must take care of fuel consumption and leaks. (e) This margin would conceivably permit us a precautionary work on station. We would then have to start for home and jettison stores torpedoes and other weight. (f) Continuing the patrol without repairs is not justified.

1922(L) Surfaced and informed Task Force Commander of decision. Set course for inbound routing points at best 3 engines speed. Noon Posit: Lat.05-14.23S., Long.154-00E. Distance run: 220 miles.

5 April 1943.

Proceeding southward between PENN and HISSAR Islands, at 3 engine speed. Submerged during daylight. Noon Posit: Lat.05-14.23S., Long.154-00E. Distance run: 220 miles. Fuel used: 2525 Gals.

6 April 1943.

Proceeding between New Ireland and Bougainville, on route Brisbane. Submerged during daylight.

1830(K) Sustained casualty to 2 main engine. Sea Paragraph 10 (f). Noon Posit: Lat.08-073., Long.155-00E. Distance run: 216 miles. Fuel used: 2740 Gals.

- 8 -

Enclosure A

— page 124 —
5 0636
GATO
CONFIDENTIAL
FIFTH WAR PATROL
CONFIDENTIAL

7 April 1943.
Proceeding to Brisbane. Submerged during daylight.
Noon Posit: Lat.11-00,OS., Long.157-15E.
Distance Run: 205 miles. Fuel used: 2582 Gals.

8 April 1943.
Proceeding to Brisbane. Zigzagging during daylight.
Noon Posit: Lat.15-36S., Long.156-50E.
Distance Run: 301.8 miles. Fuel used: 4314 Gals.

9 April 1943.
Proceeding to Brisbane. Zigzagging during daylight.
Noon Posit: Lat.20-42S., Long.156-25E.
Distance Run: 317 miles. Fuel used: 3471 Gals.

10 April 1943.
Enroute Brisbane. Zig zagging during daylight.
1400(K) Made quick dive for submerged drills, check-up on certain leaks and noises, and to determine how our margin of variable water has decreased. Find that, with safety tank still dry, our overall variable water at final trim at periscope depth is now only 3.5,57tons. (In other words our margin has decreased slightly over 7 tons in 6 days).
Noon Posit: Lat.25-09S., Long.155-17E.
Distance Run: 317.5 miles. Fuel used: 2999 Gals.

11 April 1943.
Entering Brisbane.
0400(K) Passed Caloundra Head.
0440(K) Picked up pilot.
0600(K) Arrived Brisbane.
Noon Posit: Brisbane, Queensland, Australia.
Distance Run: 207 miles. Fuel used: 2512 Gals.

- 9 -
Enclosure A

— page 125 —
3. Weather.

(a) Off Brisbane during training exercises: - Stormy.
(b) Solomon Islands: - Unsettled with occasional electric storms.
(c) North of New Ireland: - Low overcast, hazy at night, with numerous small rain squalls.

4. Tidal Information.

No unusual conditions noted.

5. Navigational Aids.

(a) TTOP Harbor: We were given a memo (believed to be an extract from Terrain Study #41) which states that the German Plan is an approximation only. On the contrary we found it to be extremely accurate. The white tripod mentioned on P 38 of A.H.P.4. is no longer in existence, but the observation spot, shown on the German Plan, is clear. The tripod beacon, shown on the south shore, is not distinguishable. Submarines should not attempt to pass submerged between SAMTAS YABBEL and RAMOS Island. They are certain to have to surface due to the shoals.

6. Enemy Vessels Sighted.

(a) Two small coastwise steamers were sighted of TTOP Harbor on 28 and 29 March, both were under 500 tons and were follwing the coastline toward IKEITA at 2 or 3 miles off shore.
(b) In TTOP Harbor on the afternoon of 28 March, there was a small non descript wooden steamer about 100 feet in length. It was dirty and had no signs of paint. It had an anchor out but also seemed to be aground on the reef off the native village. It was listing about 10 degrees. There were no signs of life on it until nightfall when a few lights showed thru the windows of its deck hess.
(c) At 05:58 (L), April 4, 1943, sighted cargo vessel of about 1,000 tons. Course 180, speed 10. Had two goal mast masts and two wells. One escort was dofiliably seen and there is a possibility that there was another present. The escort was either a torpedo boat or Corvette. Lat.3-08S., Long. 153-00E.

— page 126 —
8. No attacks were made.

9. Enemy A/S Measures (based on one contact).

Altho more successful than normal, these appeared to be the usual methods. The only escort positively seen was trailing the cargo vessel by about 700 yards. He would not have needed radar or sound gear to spot us. The depth charges used are believed to have been the regular size.

10. Major Defects:

(a) On 20 March, number 2 main generator terminal box burned due to salt water leaking from the generator cooler and running down cables to their terminals, causing a short circuit. This generator was pulling 2200 amps at the time. The balclite terminal block was burned, to depths of 2 inch (original thickness 1 1/8 inch). No spares for this part (or material for its manufacture) are carried. However, by carefully removing the charred portion and painting the surface of the block with navy coat of glyphol, it gave a satisfactory neggor reading with 500 volts across the terminals. The block was replaced and the generator tested satisfactorily at 1000 KW.

(b) Diving on the night of 28 March, it was found that negative tank flood valve leaked badly. It is thought that the gasket rubbed out on the bottom of TMP harbor or was blown out.

(c) The first servicing of torpedo #22306 disclosed that the pin for the vertical rudder connection had been left out during the final adjustments on the tender. This could have proved serious.

(d) Depth Charge Damage, 4 April:

1. After trim tank ruptured thru the pressure hull and floods freely from sea.
2. After W.R.T. tank flooded from after trim tank, this may be due to damaged overflow valve which cannot be reached without disassembling tube drain lines and the overflow line itself.
3. Pressure hull dished in slightly, frames 120-124 port, but holds at deep submergence.
4. Torpedoes jammed in numbers 9 and 10 tubes. Possibility that tubes are out of alignment. (tried to pull with 1 ton chain fall).

- 12 - Enclosure A

— page 127 —
7. All Aircraft Sighted.

DATE: 5.0636
TIME: 5.0636
LAT. S. LONG. E. COURSE ALT. DIST. TYPE
1 April: 1.0730(L) 06-40 15:57 300 3000 6 Mi.: PDY
1 April: 1.1015(L) 06-20 15:58 180 3000 12 Mi.: Unidentified
2 April: 1.1307(L) 5-25 15:54-41 Circling 2000 10 Mi.: 96 or 97
2 April: 1.1420 5-25 15:54-41 Circling 2000 10 Mi.: 96 or 97
2 April: 1.1445 5-25 15:54-41 Circling 2000 11 Mi.: 96 or 97
2 April: 1.1505 5-25 15:54-41 Circling 2000 12 Mi.: 96 or 97
2 April: 1.1525 5-25 15:54-41 Circling 2000 12 Mi.: 96 or 97

— page 128 —
5 0636
CO: IDENTICAL
FIRST WAR PATROL
CONFIDENTIAL

5. Tail buffers of all after torpedo tubes are deformed showing violent movement of torpedoes in the closed tubes.
6. Gyro spindles of all after tubes were bent and could only be retracted by disassembly of housing.
7. Torpedo tubes #7 & 8 resisted the withdrawal of torpedoes, but this was overcome by force.
8. All after tube breach doors show marks where torpedo screws struck them during the shock.
9. Number 8 and 9 torpedo tube drains leak.
10. Number 8 muzzle door leaks slightly.
11. The torpedo in #7 tube (#19212) has its propellors meshed. The other three torpedoes in the after tubes (#24698, #2319, and #2815) will have to be tested for bent propellor shafts and deranged bearings.
12. The governor of number three engine no. 1 is inoperable. The governor of number two main engine was cracked at the base plate. (It was strapped down and functioned satisfactorily).
13. Number two auxiliary engine, high-pressure nipple generator cooler broke off. (It was replaced).
14. General announcement system: The unit in the after engine room came off the bulkhead, but sustained only minor damage. The microphone inlets in coming tower and control room were inoperative due to grounds, blown fuses and broken circuits. (all items repaired).
15. The diving alarm circuit was grounded out. (repaired).
16. Number one main ballast tank rail 50 tons slightly. Two leaks of considerable size at cable stuffing boxes in coming tower. (only partially correctable at sea).
17. Storm plane motor commenced chattering.
18. One small external air leak is visible from periscope, but has not been located yet.
19. Throughout the boat minor air leaks (internal) have been located and corrected.
20. Flood valves in crows heads and manoeuvring room head were jammed open. (corrected).
21. The main battery bus bars in the control cubicle are burned, indicating that the initial shock brought them close enough for an arc to jump.
22. The after torpedo gyro regulator indicator binds in hand operation, indicating misalignment of gears and shafting.

- 13 -

Enclosure A

— page 130 —
5 0636
GAO
COORDINATOR
PIFTH WAR PATROL
COORDINATOR

(b) Sound conditions or density layers: During the morning of April 4, while this ship was at depths greater than 300 feet, it is certain that we were unheard by the enemy, although we were making 150 rpm, pumping with the trim pump, and using high pressure air. Unfortunately our own sound gear was not in a position to tell whether the poor condition was reciprocally.

(c) Habitability: With 51 passengers submerged, the air became oppressive in two hours. For a short period (2 days) this could be accepted but it is recommended that no such load be accepted for a longer trip, as one might find himself with many cases of heat prostration.

(d) Performance of Duty: It will be obvious to anyone who reads the account of the depth charging on April 4th, that there were a few grim moments when a mis step would have been very serious. The Commanding Officer can only say that the performance of officers and men was "of the highest order", as expected.

- 15 - Exclosure A

— page 131 —
5 0636
SOUTH PACIFIC FORCE
OF THE UNITED STATES PACIFIC FLEET
HEADQUARTERS OF THE COMMANDER
Serial 0732
C-O-N-F-I-D-E-N-T-I-A-L
1st Endorsement on
CINCPAC-TWO Conf.
1tr. FF12-15(72)/A16
-3/Pk, Serial 0150
of April 23, 1943.

From: The Commander South Pacific Area and South Pacific Force.
To: The Commander-in-Chief, United States Fleet.
Subject: U.S.S. GATO (SS212), Fifth War Patrol, Part I.

1. Forwarded. In successfully withstanding the damage sustained April 4 the GATO proved herself a stout ship with a stout-hearted crew. The landing and evacuation task at TEOF March 29 was skillful and commendable.

2. It is trusted that the resumption of the patrol will see the GATO turning the tables on the enemy with vengeance.

W. F. HALSBY

Copy to:
Vice
Cincpac
Cinclant
ComSoWesPac
ComSubPac
ComSublant
ComSubSoWesPac
CITF 72
ComSubron 8
ComSubDiv 81
CO USS GATO

FILMED

— page 132 —
5 0636
FF12-15(72)/A16-3/Pk
Serial 0150
CONFIDENTIAL
From: The Commander Task Force SEVENTY-TWO.
To: The Commander in Chief, UNITED STATES FLEET.
Via: The Commander, THIRD FLEET.
Subject: U.S.S. GATO (SS212), Fifth War Patrol, Part I.
Enclosure: (A) Copy of subject patrol report.
1. Enclosure (A) is forwarded herewith.
2. The GATO's Fifth War Patrol was interrupted by damage from depth charging. On April 11, 1942, she arrived at Brisbane for emergency repairs. Temporary repairs having been effected she departed Brisbane April 20, 1943, to resume patrol.
3. Part I of this patrol is being distributed without further comment pending completion of GATO's entire Fifth War Patrol.

DISTRIBUTION:
ComInch (Advance Copy)
VCNO
Com 1st Flt
Com 2nd Flt
Com 7th Flt (2)
Comsubs 1st Flt
Comsubs 7th Flt
All SS TT72 (Not to be taken to sea - NUN)
CTF 72 War Petrol and Summary Files
CTF 72 Boet File
CS5 6 & 8
CSD 81 & 82
OInC S/M School, N.L. Conn. (2)
CO GATO (File).

— page 133 —
12-10/16-3(5)/(16) SUBMARINE FORCE, PACIFIC FLEET 1d

Serial 0767
Care of Fleet Post Office,
San Francisco, California,
June 17, 1943.

CONFIDENTIAL
CONSUBSPAC PATROL REPORT NO. 194
U.S.S. GATO - FIFTH WAR PATROL.

From: The Commander Submarine Force, Pacific Fleet.
To: Submarine Force, Pacific Fleet.

Subject: U.S.S. GATO (SS212) - Report of Fifth War Patrol - Second Part.

Enclosure: (A) Copy of Subject War Patrol Report.

1. This was a continuation of the fifth war patrol of the U.S.S. GATO. The GATO obtained permission from the Commander Task Force Seventy-Two to call this patrol the second part of the fifth war patrol, inasmuch as only twenty-three days were spent on the first part of the fifth war patrol, followed by an eight day repair period.

2. The GATO successfully carried out important missions in the Southwest. In addition, excellent reconnaissance was made in the Bougainville area and various islands in the South Pacific.

3. No ship contacts were seen, and thus no attacks were made.

4. The Commander Submarine Force, Pacific Fleet, congratulates the GATO on the successful accomplishment of the hazardous missions assigned in this fifth war patrol.

DISTRIBUTION:
(Complete Reports)
Cominch (5)
VONO (5)
Gincpac (5)
Cinclant (2)
Comsubplant (8)
S/M School, NL (2)
Comsopac (2)
Comsovsopac (2)
Comsubsovsopac (2)
CTF 72 (2)
CTF 16 (1)
Comsubpac (10)
SUAD, M.I. (2)
Comsubconsubpac
Midway (2)
All Squadron and Div.
Commanders: Subspace (2)
U.S.S. GATO (1)

C. A. Lockwood, Jr.

(CONSUBSPAC Endorsement only)
All Submarines, Subspace (1)

H. C. LAVVER,
Flag Secretary.

— page 134 —
1. SUBMERGED OF TEOP HARBOR, EAST COAST OF BOUGAINVILLE. OBSERVING HARBOR ENTRANCE, adjacent coastline and mountain background. NO TRAFFIC noted. SCATTERED on the mountain side are what appear to be about 20 white tents. CAPT. ROBINSON, A.I.R., will investigate after landing and report.
2. SURFACED and drew away from COAST for the night.
3. SUBMERGED near TEOP. TRYING to IDENTIFY TEOPASINO PLANTATION. Never succeeded, altho assisted by CAPT. ROBINSON who has spent years in this district and has walked from TEOP to TEOPASINO. Any part of this coastline resembles any other. The chart shows only a dotted line running 3.5E. (Actually the coast runs due east at TEOPASINO). Decided to hover at our best estimate of the location and to depend on signal fire to guide us in.
4. OBSERVED topmasts of amall vessel coming out of TEOP. Went to 250 feet, ran silent, and tracked him by sound. He turned North.
5. SURFACED in extremely heavy rain squall. COAST INVISIBLE 2600 yards away (by radar). CIRCLED till rain decreased but hour later. NO FRISE were visible. Beach altho there was a light on the hillside. PASSENGERS assured me that this rain would not prevent FRISE so stood out to seaward for wider vision. This DISCLOSED a small light about 4 miles up the COAST. Investigation revealed the two signal FRISE. Had been advised to approach large FRISE on course 180 until small FRISE bore 1517, then head for small FRISE. Distance for starting approach not given. This caused anxiety as the directions were obviously meant to bring us thru a hole in the reef. Trimmed down, started fathometer, gritted teeth and followed direction Current was 3j knots across our course so could not ease in. Last depth encountered was 6 fathoms, which was probably at the opening. Then inside could see reef for first time. COUL JUST turn around but no room to spare. Lieutenant Everly, volunteer, proceeded in to beach in rubber boat to reconnoiter and expedite the embarkation of evacuees. This was done CONCURRENTLY with the disembarkation of passengers and freight. When his mission accomplished Lieutenant Everly started back in the rubber boat but was carried off by the current and had great difficulty getting to us. This caused delay which soon became dangerous as the NATIVE canoes had returned to "JAP INFESTED" TEOP, disclosing unusual activity in the vicinity. The boat was not located till midnight.

April 30, 1943

0013(K) The rubber boat was hoisted and the departure commenced. Least depth was again six fathoms.

ENCLOSURE (A)

— page 135 —
1. NARRATIVE
April 20, 1943

0800(K) Underway from alongside U.S.S. FULTON at Brisbane Australia, with party of 16 coast watchers and AIF Troops.
1023(K) Conducted noise test in I'crotten Bay.
1230(K) Tested upper after torpedo tubes by firing two high speed exercise torpedoes. Results satisfactory.
1600(K) Escorted thru swept channel by U.S.S. PATTERSON.
1355(K) Made trim dive combined with 300 foot test dive. Results satisfactory.
1945(K) Commenced night approaches on U.S.S. PATTERSON. Made one surface and two submerged attacks.
2230(K) Proceeded on base course. Zigzagging in moonlight. Escorted by U.S.S. PATTERSON.

April 21, 1943

0800(K) Commenced second day exercises with U.S.S. PATTERSON. In forenoon acted as target for A/S attacks. In afternoon made four simulated attacks on him.
1610(K) Completed exercises with U.S.S. PATTERSON which returned to port.
1614(K) Enroute Solomons at two engine speed.

April 22 to April 27, 1943

Enroute Bougainville, Solomon Islands. Exercising daily at battle stations, clearing bridges, diving, battle surface and firing 3" and 20mm guns. On April 23, at 0955(K) avoided masts seen on horizon. (Lt. 15-203, Long. 157-002). Excellent weather enabled us to make good time so, at our request, the date for entering TEOF was advanced to 28 April. However, on 25 April ComTaskFor Seventy Two directed us to stay clear of TEOF because of Japs present, and to attempt the landing at TEOFASINO Plantation, several miles to the south of TEOF. On 27 April the landing was postponed until 29 April to enable the coast watchers to rescue survivors of a crashed PBY. Gato was off the coast on the morning of 28 April.

-1-

ENCLOSURE (A)

— page 136 —
0035(K) Clearad last shoal and stood east on 3 engines.
: 0317(K) Informed CTF 72 we could pass Ramos Island at dusk tomorrow and requested rendezvous.
: 0525(K) Submerged at daylight. Spread CO2 absorbent and controlled the smoking as our missionary passengers are in bad shape. They are run down, most of them cough, all appear undernourished. Our pharmacists mate was kept busy treating infarcted abrasions, tropical ulcers, some sort of poison oak rash and various minor ailments. However, their appetites were encouraging.
: 1416(K) Weather became progressively worse. Flying would have been impossible. Surfaced on three engines in a torrent.
: 2000(K) Received from CTF 72 instructions for rendezvous with S.C. 504 just north of Florida Island.

May 1, 1943

: 0502(K) Approaching indespensable strait.
: 1045(K) Submerged at daylight. Intended to jockey for position to dash over the reefs at dusk.
: 1246(K) Weather became too vile for flying. Surfaced and with decks awash stood thru strait passing west of Ramos Island. Least depth was 30 feet under keel while drawing 26 feet.
: 1548(K) Submerged in deep water south of Ramos. Weather clearing rapidly.
: 1747(K) Sighted B-25 flying low bearing 175°T, course 000°T, distance estimated 10 miles. Went to 100 feet.
: 1947(K) Surfaced and stood toward rendezvous.
: 2045(K) Transferred completed. Proceeded via Indespensable strait enroute assigned patrol station.

May 2, 1943

: 2035(K) Enroute patrol area. Made following estimate of fuel situation:
   (a) Fuel on hand (Noon May 2) --- 62,903 Gal.
   (b) Fuel needed from Indespensable Strait to Operation area --- 3,000 Gal.
   (c) Fuel needed area to Pearl (rhumb line at 13 knots) --- 37,852 Gal.
   (d) For unusual conditions or chores enroute Pearl-3,000 Gal.
   (e) Keep for one six hour pursuit --- 1,800 Gal.
   (f) Total requirements other than for patrolling station --- 45,652 Gal.
   (g) Balance available for 25 days in area --- 18,251 Gal.
   (h) Daily quota in area (charge, Propulsion and extra chase) --- 730 Gal.

--- 3 --- ENCLOSURE (A)

— page 137 —
1943

**Subject:** U.S.S. GATO - Report of Fifth War Patrol - Second Part.

The above will justify the reluctance with which ComTaskFor 72 uses submarines for those landings and evacuations. In addition to the time taken from their stations and the possibl. loss from rocks, shoals and enemy traps, submarines diverted for this work are thereafter greatly restricted in their movements for the duration of the patrol.

Further study shows what can be accomplished with the daily quota of fuel:-
(a) Can run 4 engines (850 Kft) for 2.33 hours, or
(b) Can run 3 engines (850 Kft) for 3.2 hours, or
(c) " " " 2 "

— page 138 —
1943
May 11-13, 1943
Crossing and regrossing the knuckle in the Truk-Rabaut traf-
fic lane. (Lat 1°-00N Long. 152-10E). No contacts. On the
evening of May 13, 1943 (at 1857 K) the S.J. Radar made con-
tact and reported a very small echo 800 yds. abeam (Lat 00-
45N Long. 152-03E). Gato turned away and increased to flank
speed. Three pairs of binoculars were unable to see anything
altho the moon was bright. The contact had disappeared im-
mediately and did not re-appear. After a discussion with the
radar operator the C.O. decided that it was probably a peri-
scope. If so no targets will be along this line for a while.
Set course for the next line to westward, which is the direct
Truk-Steffen Strait line.

May 14, 1943
0400(K) Reached the Truk - Steffen Strait line and proceeded on
southerly course toward the latter. Submerged during day-
light except for a one hour period at noon. In evening
received CTF 72 despatch 140958 which convinced C.O. that S.D.
radar is a liability. Do not propose to use in future.

May 15, 1943
1030(K) Reached point where three supposed tracks to Steffen Strait
converge to within 10 miles of each other (from Truk, from
Saipan, and from the "Knuckle"). Commenced patrolling on
east-west courses across junction of above mentioned traffic
lanes. Submerged during daylight making about 7 knots, picked up
while on surface, deck awash, making about 7 knots, picked up
high speed screws bearing 050 relative. Nothing was visible
with binoculars. Radar could pick up nothing. Altho visi-
bility patchy (numerous local rain-squalls) the bearing
indicated was clear for at least 10,000 yds. Gato turned
away while trying to see or track. Screws faded very quickly
(but not before sound expert had heard and identified them
as destroyer making about 250 rpm). Gato stopped own screws
to permit better listening but no further contact was made.
Gato proceeded thru a handy rain squall and continued patrol.

May 17, 1943
Patrolling same spot, North of Steffen Strait.

May 18, 1943
Patrolling same spot.
0116(K) Received subs strip No. 16 stating Grayback heading east
right thru our present position. Same message directed Gato
report results and fuel remaining, and indicated we may be
moved west of MUSAU tonight. Gato to course northeast at two
engine speed to clear area and transmit. Told Task Force Com-
mander of negative sightings, plenty of fuel and of the fact
that we have not yet reconnoitered Greenwich. Then steered
northwest.

- 5 -

ENCLOSURE (A)

— page 139 —
2000(K) At western edge of area, waiting for message.
2151(K) Message came, but it says, "GO EAST fast". We could not have been further from our new spot which is Greenwich Island. After looking over Greenwich we are to conduct reconnaissance patrol along Let. one North, Long. 154 to 156. There is indication of major southbound enemy force.
2312(K) Received strip message #20 with routing instructions to Pearl (departing here on May 27). Also calls for looking over TARANA enroute.

May 19, 1943
1528(K) Sighted Greenwich Island after 290 mile speed run.
1549(K) Submerged to close islands and reconnoiter. No activity seen. Particularly noted that no aircraft landed or took off from lagoon before sunset.
1825(K) Surfaced and set course to circumnavigate Greenwich Atoll.

May 20, 1943
0429(K) Reconnoitering Greenwich Island.
(a) Two radio towers.
(b) Radio shack.
(c) Lookout tower, (this also has acrological gadgets).
(d) Water stowage tank.
(e) Several buildings (masonry with red roofs).
(f) Small wharf to seaward. (Lagoon side not observed).
(g) Flag pole (No flag on it).

Note:- All the above could be completely destroyed by 3" gunfire, from outside the lagoon. Deep water runs in to 100 yards from shore. No aircraft were seen in the air or on the ground or water, and there is a definite absence of hangars. No ramps could be seen inside or outside the lagoon. Pictures were taken at distances between one and two miles off shore. Pointers and trainers of all guns as well as the relief pointer and trainers were shown the "target" through the periscope. Inside the lagoon, about 1000 yards from the above group, was a small vessel which resembled a buoy tender on net tender. It was about 150 feet long had a clipper bow and a large davit-like crane. It appeared that the bow was equipped to handle lines, buoys, nets or mines. She was very neat and had white awnings fore and aft. This, of course, was marked for incidental destruction. Small pleasure-type sailing boats were racing inside the lagoon during the afternoon.
1824(K) Surfaced and headed out to eastward. Patrolling on east-west courses. Held battles surface and gun pointing drill.

- 6 -

ENCLOSURE (A)

— page 140 —
1943
U.S.S. GATO - Report of "Fifth War Patrol - Second Part."

May 21, 1943
Patrolling east of Greenhithe Islands.
0244(K) Received Sub S 72 Strip serial 21 asking if we have a certain harbor chart and directing us to head south for a special job taking some soundings off Bougainville. Also calls for acknowledgment and fuel on hand. Started south along longitude 156°E.
0425(K) Altho it was near daylight, tried to transmit Gato 201825 acknowledging the above message, telling of fuel and chart on hand, and giving results of Greenhithe observations. Thought it best to get it off here (near Greenwich) before our future movements are evident from our position. However, interference believed to be from the recently seen radio station, prevented its complete delivery, and we quit in broad daylight without obtaining a receipt. Hope to get partial acknowledgement on tonight's schedule.
0625(K) Received Sub S 72 Strips number 22 and 23 which give details of the special job. We are to take soundings of Numa Numa (Bougainville) to determine protractibility of mining. We are to make complete report from vicinity of Lat. 6 south Long. 158 east.
0941(K) Proceeding south on surface. Sighted B-17 bearing 110°T, height 2000 feet, distance 73 miles, heading toward Gato.
1104(K) Surfaced, all clear, continued southward on one engine, zig-zagging. Not using 3D radar.
1234(K) Sighted plane, did not identify clearly. Believe it was 2 engine Nonplane, bearing 325°T, course southerly, altitude about 2500 feet, distance 7 miles. Dove immediately and changed course at 200 feet.
1359(K) Surfaced and continued southward.

May 22, 1943
Proceeding southward toward Bougainville.
0103(K) When last schedule of radio messages contained no word from CTF 72 that he had received our 201825, or part of it, we retransmitted it.
0530(K) Submerged at daylight in hopes of picking up a target on this line.
1730(K) Surfaced and headed for Numa Numa using two engines in order to be there before daylight.

May 23, 1943
0400(K) Submerged about 2 miles off reef at Numa Numa, and waited for enough light to plot positions. Attention is here invited to the German sketch map of Numa Numa Harbor (chart 1699 A). If this chart were accurate it could possibly be used to identify the harbor, altho there are spots every few miles along the coast which have villages, rocks and reefs in about

— page 141 —
U.S.S. GATO - Report of Fifth War Patrol - Second Part.

Subject: U.S.S. GATO - Report of Fifth War Patrol - Second Part.

these same relative positions. In fact, after several hours of experimenting with the landmarks it was decided that we were not off Numa Numa because the villages and islands were definitely not in the relative positions shown. The final answer came after 10 hours of trial and error, crossing and re-crossing the area, assuming that first one group of land marks and then another was correct, and plotting that group against distance run. To be brief, the net result is as follows.

(a) The village of NUMA NUMA is correctly located and there is a prominent green shed at its northern point right on the waters edge.

(b) The village of UHIMIEA is correctly located with relation to Numa Numa.

(c) The village of KOI KOI is not visible.

(d) Of the three "bumps" shown on the reefs, none are in the positions shown. One bump shows fairly well from seaward and can be used for plotting. Its position is Lat. 50° 50' - 31.5" S., Long. 155° - 13' - 38.5" E.

(e) The northernmost reef does not break in a moderate sea.

(f) The reef to the southeast is not break continuously, even on a calm day.

During the period devoted to locating landmarks, we were twice interrupted by small coastwise craft passing, once in a pair and once in a trio. These vessels average, about 50 tons, are driven by what sound like old diesel engines, and are slow dilapidated affairs. They fellow the coastline and occasionally spread a square canvas to augment their speed. Geto remained out of sight each time they appeared.

1400(K) When finally sure of our position, commenced a systematic coverage of the area. Before darkness we were able to cover 30 squares of our assigned grid (about 30%) taking an average of thirteen soundings per square.

1831(K) Surfaced and ran on East-West course across the coastwise traffic lanes during the night. No contacts.

May 24, 1943
0500(K) Submerged and continued soundings in the assigned area. No interruptions occurred and the soundings were completed by 1741(K).

1757(K) Surfaced and ran east for the night, clearing the coast and heading for point designated for radio transmission.

May 25, 1943
0517(K) Proceeding on easterly course, north of Choiseul Island.

1115(K) Surfaced to gain the necessary 13 miles to reach our assigned spot at dark.

- 8 -

ENCLOSURE (A)

— page 142 —
1212(K) Made quick dive. Storn planes jammed on hard dive causing excessive angle on boat. Is stated 30°). It was necessary to blow main ballast as well as safety tank, and to back emergency. This casualty is discussed in paragraph 10 as it is believed to disclose a dangerous fault in design.

1700(K) Changed time to zone -11.

1817(L) Surfaced at spot, designated, and transmitted our report of sounding taken. The delivery of the messages (Two parts) took about 90 minutes, during which time Gato maneuvered about the spot, mostly on north-south courses. Included a report of 'no targets and plenty of fuel to make Johnston via TARAMA.

1940(L) On completion of radio transmission set course east on two engines, heading between Ontong Java and Rancador Reef.

May 26, 1943

0115(L) Proceeding toward Nauru and Ocean Island enroute Tarawa. Received Subs 72 Strip #25 which directs us to pass to the command of Commander Submarines Pacific Fleet, on May thirty. We are then to proceed to Tarawa if fuel permits, and to spend one daylight period patrolling there before proceeding to Johnston or Pearl.

0130(L) Received Subs 72 Strip #26, warning of Silversides coming across our path. Her route is given, but only the date of his departure from Johnston so it is impossible to predict his progress, since he is to make a stop enroute. Decided that this only certain way to avoid him was to head due north crossing well ahead of him. This course of action would also permit a slight possibility of a target which is lacking in this vicinity.

0700(L) Changed course to north to cross Lat. 00-30 south, ahead of Silversides. Ran on two engines.

May 27, 1943

0024(L) Received Subs 72 Strip #29 which cancels the above plans by directing Gato to "Pass at least 50 miles south of NAURU which should keep her well clear of Silversides". Set course to comply. No contacts.

May 28, 1943

Proceeding eastward, well south of Nauru Island. Submerged during daylight. Proceeding eastward. It appears that we are not expected to cross the 0°-30' South line until tonight. By crossing early we may interfere with Silversides. Decided to look over Ocean Island enroute.

0245(L) Sighted Ocean Island bearing 08.00T.

0355(L) Submerged 6 miles west of Ocean Island, and closed the harbor. No ships present. No aircraft took off at dawn. The only activity noticeable from 1.5 miles away was at what is assumed to be the same time.

-9- ENGLISH (A)

— page 143 —
1100(L) The small patrol boat which had been stationary in the bay, moved out and took up a patrol across the southwest side of the island. She cruised in a line about 3 miles long with its mid point off the harbor. She did not detect Gato at a range of 1050 yards, at which range we went deep and ran silent.

1140(L) Commenced tour about island to locate landing strip or other military installations. Results as follows:
   (a) The main town looks quite modern and well kept.
   (b) The native villages are weather beaten.
   (c) Japanese flag flies on the "Residency".
   (d) Surprisingly, there is no landing strip on the level land at the northwest corner of the island.
   (e) A radar with a parabolic face is situated at the geometrical center of the island, in the plateau.
   (f) Many towers (Probably radio) dot the high part of the island. Most of them have some small structure at the upper end. Cannot tell whether this is a detection device or part of the antenna array.

(g) No landing strip or other evidence of aircraft could be seen. We could not, of course, see the top of the central plateau.
   (h) No gun installations were visible. If present, they are well camouflaged.

Remarks: - Alt: the phosphate works, the dock area, the residency (or any other part of the island) could have been shelled at dusk with reasonable accuracy, it was decided to take no action for the following reasons:
   (a) None of the targets are exclusively military.
   (b) All are surrounded by (or probably occupied by) former inhabitants, in a con combatant status.
   (c) We are unacquainted with any plans our superiors may have for the future use of this spot.
   (d) Since submarines pass here in great numbers, there must be some reason in the "grand - strategy" for its immunity.

1735(L) Completed the circumnavigation about 1.5 miles off Home Bay, took some snapshots, and set course east.
1828(L) Surfaced in extremely black night. Could make out dim outline of Ocean Island in the relatively good visibility due west. Ran east at best speed.
1857(L) At a distance of 11.5 miles from the island, we were challenged by flashing light. In view of the visibility conditions, this

— page 144 —
1943 (L) U.S.S. GATO - Report of Fifth War Patrol - Second Part.

indicates to us that the radar searches the surface rather than exclusively the air.
On the meridian of 170°E changed course to North, secured SD Radar and slowed to economical speed.

May 30, 1943
0001(L) Crossed equator at longitude 170E, passing to the operational control of Commander Task Force Seventeen. Shifted radio guard to station NEM. Set course for TARAUA Atoll, in the GILBERT Group. Submerged during daylight.

May 31, 1943
0447(L) Reconnaissance of Tarawa.
Submerged to approach BITITU, the principle island of the atoll. Noted that the reported current of 2½ to 4 knots on the southern side was lacking. Throughout the day observed Bititu Island and that part of the lagoon visible from the south and west. No ships used the channel. None occupied the anchorage. No aircraft were seen at any time. Most activity is on the north (or lagoon side) of Bititu. Building the channel is not feasible. Ships anchored off Bititu would be immune to torpedo fire. Shelling of the anchorage or shore installations by submarine would be impracticable. Surface craft however could pass along the south shore and level the island.

At the corners of the island towers have been erected. They are sturdy steel structures, with no platform for lookouts. Their purpose was not determining the location of the island. Radio towers in addition to the above are located near the eastern end of the island, but not where shown on the chart. We are not able to give the exact location. No patrol (surface or air) was seen. Surfaed in poor visibility, southwest of the atoll, and proceeded south on three engines.

1828(L) Turned east to pass between Tarawa and Maiana Islands. Taking soundings enroute.

1908(L) Soundings decreased at an alarming rate. Depths went from 2100 fathoms to 200 fathoms in the space of about three miles. Least depth encountered was 160 fathoms at an estimated point seven miles south of Bairiki Island. It is noted that the only sounding given on the chart for this vicinity is 413 fathoms.

June 1, 1943
1000(L) Proceeding on surface toward Johnston Island.
1116(M) Change to zone - 12 time.
At a point 175 miles due east of Makin Island, sighted a large type plane believed to be 4 motors. Bearing 037°T., distance 12 miles, altitude about 1200 feet. Course 210. Gato submerged for 70 minutes.

- 11 -

ENCLOSURE (A)

— page 145 —
1348(M) In Lat. 3-20 North, Long. 175-01 East, sighted 4 engine land plane bearing 090 heading 270 altitude 1000 feet distant 7 miles. Made quick dive. Our identification pictures show no Japanese 4 engine land planes. If no B-17's were thorough, intelligenee should be interested.

1456(M) Surfaced and cleared the vicinity.

2400(M) Set calendar back one day. (Zone time plus 12).

June 1-4, 1943.
Proceeding to Johnston Island for additional fuel to reach Pearl. On the afternoon of June 3 a patrol plane (PEY) passed about 12 miles abeam, on parallel course, altitude 1000 feet.

June 4, 1943
0616(X) Arrived Johston Island. Fueled.

0930(X) Departed for Pearl. NAS Midway sent our departure and ETA report.

June 5, 1943
0100(W) Received CTF 17 serial 10 E, designating rendezvous.

June 6, 1943
0600(W) Effected rendezvous with Skipjack, Sawfish, and PC 549. Proceeded toward Pearl.

1030(W) Arrived Pearl Harbor.

2. WEATHER

(a) Off Brisbane (April 20) Clear. Choppy sea. Brisk wind.
(b) East of Barrier Reef (April 21-23) Generally clear. Moderate swells.
(c) Coral Sea (April 24-25) Clear. Ruffled sea. Light breeze.
(d) North of Buka (April 27) Clear. Light choppy sea.
(e) East of Bougainville (April 28-29) Heavy rain approximately 50% of period.
(f) Indispensable Streit (May 1) Spasmodic heavy rain.
(g) Near Taua Islands (May 3) Frequent showers.
(h) Equator near Long. 152E (May 6-20) Occasional showers. Moderate sea. Light breeze.
(i) Greenwich Island (May 20) Clear. Calm.
(j) East Coast of Bougainville (May 23-24) Few scattered showers at night. Smooth sea.
(k) S. W. of Nauru (May 26) Glassy sea 75% of time. Clear.
(l) Ocean Island (May 29) Calm. Clear until showers at dusk.
(m) About Tarewa (May 31) Clear. Calm.
(n) Tarewa to Johnston (June 1-3) At halfway spot entered overcast. Squalls. Moderate seas. Light NE breeze.
(o) Johnston Island (June 3) Overcast.

- 12 -

ENCLOSURE (A)

— page 146 —
3. TIDAL INFORMATION
The only abnormal tidal condition noted was the lack of current south of TARAVA, where the chart indicates two and one half to four knots. (1143 to 1400(L) May 31, 1943.

4. NAVIGATIONAL AIDS
(a) The harbor of Numa Numa (Chart onse 1699a) may be identified by a prominent green shed at the north point of the village of Numa Numa. The position of this building is Lat. 5-50-56 South, Long. 155-13-01 East.
(b) On the same chart the three bumps shown on the reefs are definitely not in the positions shown. One of them is located at Lat. 5-50-31.5 South, Long. 155-13-37.5 East. Others could not be located.
(c) The village of UTMERIA on the same chart as above, is correctly located and may be used to fix position within the harbor.
(d) The only navigational lights announced were the coast-fires at Teopasino, on 29 April. Lieutenant Keenan, R.A.N.R., should be commended. His fires and instructions brought us safely thru the reef not more than ten years older. He also had the common sense to quench the fires when we were "safely" inside.

5. CONTACTS - None.

6. ALL AIRCRAFT SIGHTED

| Date | Time | Lat. | Long. | Dist. | Course | Alt. | Remarks |
|------|------|------|-------||-------|------||
| May 21 | 1548(K) | 08-428 | 160-05E | 10 mi. | 000 | 1,000 ft | Allied B-25 |
| 21   | 0941(K) | 00-22N | 156-01E | 7.5 mi. | 290 | 2,000 ft | B-17 |
| 21   | 1234(K) | 00-09N | 156-00E | 7 mi. | 180 | 2,500 ft | Unid. 2Eng.Mono plane |
| June 1 | 1116(M) | 03-09 | 175-50 | 12 mi. | 210 | 1,200 ft | Unidentified large patrol type |
| 1    | 1348(M) | 3-20N | 176-01E | 7 mi. | 270 | 1,000 ft | 4 engine land plane |
| 3    | 1500(X) | 14-50N | 171-36E | 12 mi. | 50 | 1,000 ft | U.S. Navy PBY. |

7. SUMMARY OF SUBMARINE ATTACKS
None made.

— page 147 —
8. ENEMY A/S MEASURES - None observed except patrol off Ocean Island.

9. ENEMY MINESWEEPING OPERATIONS - None observed.

10. MAJOR DEFECTS

(a) Stern Plane Casualty.

On a quick dive on May 25, 1943, the stern planes were placed on hard dive, at which point power was lost. Cause: The series relay 3 SR contactor (type 175) in the dynamic breaking and pilot circuits, stuck in the open position. Examination of the contactor discloses a condition which is considered a fault in design. The length of the contact lever is only slightly less than the space it must occupy in the open position. The slightest sag in the bracket which supports this contact lever will cause it to jam as ours did. The sag is quite possible since the same bracket supports the solenoid. Remedies suggested are: - Shorten the contact lever or invert the entire device so that a sag will have the opposite effect.

(b) Salt Water Piping.

(Condenser cooling water for refrigeration and air-conditioning systems). Small holes appeared in both the refrigerating pump suction line and the overboard discharge line from the air conditioning condensers. In each line the holes appear very close to a flange, but lock like porosity holes in the metal. The flanges are silver soldered, which may be pertinent. Temporarily repaired by tightly wrapping with small gauge copper wire then soldering over with lead solder. This method was successful.

(c) Submerged Leop.

The DO loop flooded and grounded out on a deep dive. It was not considered advisable to dismount it at safe for repair.

11. RADIO RECEPTION - Radio reception was complete. Last consecutive series:
   (a) Received from CTF 72 - Strip No 29.
   (b) Sent to CTF 72 - Gato-250800 of May.
   (c) Received from CTF 17 - Gato 020300 of June.

12. SOUND CONDITIONS AND DENSITY LAYERS - No unusual sound conditions or density layers were encountered.

13. HEALTH AND HABITABILITY

To give the best medical picture of this patrol it must be con-

- 14 -

ENCLOSURE (A)

— page 148 —
15. FUEL EXPENDED BRISBANE TO JOHNSON ISLAND - 87,369 GAL.
    - Total: 89,369 GAL

16. TACTICS OF ENDURANCE REMAINING:
    (a) Torpedoes 20
    (b) Fuel remaining - Johnson Island 4,463 gal (Refuelled there).
    - At Pearl 2,573 gal.

ENCLOSURE (1)

— page 149 —
U.S.S. GATO - Report of Fifth War Patrol - Second Part.

(c) Provisions: Ten days.
(d) Fresh water: Indefinite.
(e) Personnel: Two weeks.

17. REASON FOR TERMINATION OF PATROL:
Date set by despatch (in order meet date at navy yard).

18. REMARKS:
The executive officer (who was also the Navigator), was detached the day we sailed. His navigational duties were taken over by Lieutenant C.F. McGivern, our gunnery and torpedo officer, on a patrol which contained some of the most difficult navigational situations possible, Lieutenant. McGivern's navigation was stellar.

Lieutenant R.K. MacLean U.S.N.R., whose pre war experience was a far cry from handling personnel, was suddenly called upon to add the duties of executive officer to his job as First Lieutenant. This he has done exceptionally well. In the meantime he taught himself navigation. The Commanding Officer wishes to go on record as "all for" these energetic reserve officers who make up in enthusiasm what they lack in experience.

-1- ENCLOSURE (A)

— page 151 —
SS212/A16-3
Serial 017
DECLASSIFIED
From:  The Commanding Officer.
To:  The Commander Task Force SEVENTY-TWO.
Subject:  Report of Sixth War Patrol.
Reference:  (a)  Comtaskfor 72 Serial 0200 of 4 June 1943.
Enclosure:  (A)  Narrative of Sixth War Patrol.
    (B)  Navigational Time Plots of Approaches.
    (C)  Track Chart of the Patrol.
1. In accordance with reference (a), enclosures
   (A), (B), end (C) are submitted.
R.J. POLFY.

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY: 00-09892 C DATE: 5/26/72
DECLASSIFIED

— page 153 —
11 September 1943
Enroute Ocean Island.
Noon Posit - Let. 10-21 N., Long. 171-11 W.
Distance Run 336.7 miles, fuel used 3,598 gals.

: 12 September 1943
Enroute Ocean Island.
1500(M) Increased to 3 engine speed.
1800(M) Increased to 4 engine speed, in order to reach a
possible contact location on the northern approaches
to Makin at dawn tomorrow.
Noon Posit - Let. 6-58 N., Long. 172-56 E.
Distance Run 343 miles, fuel used 3,622 gal.

: 13 September 1943
06:00(M) Submerged to patrol across the northern approaches
to Makin. No contacts.
1840(M) Surfaced and proceeded toward Ocean Island.
Noon Posit - Let. 3-36 N., Long. 172-58 E.
Distance Run 324 miles, fuel used 5,101 gal.

: 14 September 1943
Enroute Ocean Island for submerged reconnaissance.
Submerged during daylight except for IAN sunsights.
2141(L) Directed drop present plans and get to Cape |.stscribe
by dawn 19 September.
2230(L) Messages provide the time and incentive for GATO to
spend tomorrow on the Nauru - Ocean line, well clear
of PETO, but in position to intercept if firefighters
should go to Ocean Island.
2300(L) Set course and speed in accordance with above.
Noon Posit - Let. 00-53 N., Long. 175-36 E.
Distance Run 205 miles, fuel used 2,685 gal.

: 15 September 1943
0547(L) Submerged on line between Ocean and Nauru Islands.
Patrolled toward Nauru.
1756(L) Surfaced and continued toward Nauru to intercept
any target which might have left there at dark for
Ocean.
2100(L) Above scheme bore no fruit. Changed course to 1800
true, heading for point designated for radio trans-
mission.
Noon Posit - Let. 00-09 S., Long. 168-39 E.
Distance Run 177 miles, fuel used 1,498 gal.

: 16 September 1943
0343(L) Tried to transmit next three days' positions as
directed. Could raise no one. Sent message blind,
then (at 0436) set course 240° for Cape Astrolabe.
0517(L) Submerged. Held a few submerged drills during the
day.
1756(L) Surfaced and continued on one engine.
2010(L) Our message of last night did not arrive. Transmit-
ed another with same information. This receipted
for immediately.

- 2 -

— page 154 —
17 September 1943
Enroute Cape Astrolabe. Submerged at dawn because of last night's transmission.
1145(L) Surfaced and proceeded on two engines.
Noon Posit - Lat. 04-08 S., Long. 165-46 E.
Distance run 155 miles, fuel used 1,189 gal.

: 18 September 1943
Enroute Tulagi on surface at 2 engine speed.
1140(L) Sighted a 2-engine unidentified plane, bearing 060° T., distant about 8 miles, course 240° T.
(Heading for us).
1141(L) Submerged to 150 feet and changed course.
1231(L) Surfaced, nothing in sight, proceeded on two engines.
1730(L) Sighted friendly night patrol from Guadalcanal.
Established communications by flashing light.
Noon Posit - Lat. 07-29 S., Long. 161-44 E.
Miles run 319. Fuel used 3,426 gal.

: 19 September 1943
Approaching rendezvous of Cape Astrolabe.
0550(L) Joined the 761, then U.S. GUARDIFFISH and proceeded to Tulagi Harbor.
1110(L) Moored to Government Wharf, Tulagi, for removal of all torpedoes except those in tubes.
1619(L) Went alongside the Tulagi station fuel tanker and fueled to expedite.
Noon Posit - Tulagi Harbor, Florida Island.
Miles run 242.5. Fuel used 2,932 gal.

: 20 September 1943
Moored to U.S.S. GUARDIFFISH in Tulagi Harbor. During the night several Miplanes raided Guadalcanal, hitting one plane and a small arms ammunition depot.

: 21 September 1943
In Tulagi Harbor. During the night, two air raids were held over the area, but Guadalcanal was the only target.
0200(L) We watched two Nip bombers shot down by fighters. Learned one other fell, but was not burning.
1400(L) Underway from Tulagi. Escorted until dark by U.S.S. WARD (APD16). Proceeding toward Bougainville.
Noon Posit - Tulagi Harbor.

: 22 - 29 September 1943
Carried out special mission east coast of Bougainville.
29 September 1943
0400(K) Made rendezvous with U.S.S. STRINGHAM, escort, and started for Tulagi.
0400(K) The master gyro lost vacuum and started to heat up. It was secured immediately. Steered by auxiliary compass.

— page 155 —
0833(K) Anchored in Tulagi Harbor to await our turn at torpedo loading dock.
: 1103(K) Moved to dock and commenced loading our torpedoes, recovered E.C.M. and other secret matter which had been landed. No fuel was needed as we already have the sixty thousand gallons to which we are limited. The defective part for our gyro is not to be had locally, we found. Requested air shipment from Comserons opac and Comtaskfor 72. Meantime, endeavored unsuccessfully to use the spare vacuum gage from the auxiliary gyro.

Noon Posit - Tulagi Harbor.
Miles run 274. Fuel used 3,774 gal.

30 September 1943
: 0800(L) Moored in Tulagi Harbor, working on gyro and antenna trunk. Completed repairs to antenna and tested it, reporting our completion of mission, gyro trouble, and desire for a month in the operating area. DRUM directed to give us their south gyro rotor and to await arrival of the new one.
: 1225(K) U.S.S. DRUM came alongside and transferred gyro part. Arranged with Comtaskfor THIRTY-ONE for air shipment of our defective gyro per to Brisbane.
: 1915(K) Radar flashes appeared on our screen from the bearing of Ramos Island. Interval 14 seconds.
: 1823(K) Noon Posit - Tulagi Harbor.
: 1823(K) Miles run 00. Fuel used 00.

1 October 1943
: 0345(K) Heading northwest through "bombing restriction lane", at four-engine speed.
: 0345(K) Observed anti-aircraft firing on the approximate bearing of Rekata Bey.
: 0345(K) Made trim dive.
: 0538(K) Surface and zig-zagged on four engines.
: 0647(K) Sighted unidentified patrol plane on parallel course bearing 180° T., distant about 5 miles. Submerged to 200 feet and flooded the antenna trunk, despite recent repairs.
: 0828(K) Surface and proceeded.
: 1302(K) Just after dark, obtained a very small radar contact at a range of about 2,000 yards. While we were avoiding it, the image disappeared and reappeared several times. This indicated a periscope. We gave it a wide berth as there is a possibility that the GUARDFISH; preceding us by 24 hours was delayed.

— page 156 —
2000(K) Concluded, after the day's work on the gyro, that we cannot maintain the proper vacuum at the regular speed; but that the error is only 1° at the reduced speed; so we will use it with a carefully watched error, rather than dismantling it at this time.
: 2 October 1943
: 0505(K) Heading north toward equator on longitude 155° E.
: 1802(K) Submerged.
: 2040(K) Surfaced and proceeded on two engines.
: 3 October 1943
: 0514(K) Submerged at daylight.
: 1803(K) Surfaced and continued at best speed.
: 4 October 1943
: 0516(K) Submerged for daylight run.
: 1805(K) Surfaced and continued.
: 5 October 1943
: 2300(K) Received orders giving GATO the area (which we now occupy) extending from the south entrance of Truk, down to five degrees latitude.
: 6 October 1943
: 0508(K) Dived.
: 0800(K) Set course for centerline of assigned area. Propose to petrol on east-west courses across the known traffic lines south of Truk.
: 1807(K) Surfaced due south of South Pass and commenced patrolling on short east-west legs.
: 7 October 1943
: 0509(K) Patrolling south of South Pass, Truk.
: 1815(K) Submerged.
: 8 October 1943
: 1109(K) Submerged.
: 1134(K) Sighted smoke bearing 145° T.

— page 157 —
1138(K) Battle Stations, Submerged. Commenced approach. Smoke was from the lesser of two cargo ships, which were escorted by one destroyer and one other escort vessel (not definitely identified). The two AKs were in line of bearing and following a radical zig-zag almost in unison. The DD was on the starboard bow of the right hand ship. The other DD was on the port quarter of the left hand ship. Escorts patrolled their stations.

1257(K) Conducted approach primarily on the larger of the target's but hoped to solve the destroyer's gyrations. A zig put us dead ahead of the small AK but with a 50 degree angle on the bow of the primary target. Range was 2,200 yards.

1258(K) Fired the four after tubes at the large target. Observed three torpedo tracks. (But two torpedoes were fired with same gyro angle and might have used same track). One appeared to pass just ahead of or just under the bow. The second torpedo headed fair for the target, a fine mist or spray rose from the waterline, reaching slightly above the main deck and hanging in the air for about a half-minute. No detonation was heard in the conning tower. Torpedo room reported a peculiar single concussion. I am afraid the GATO had her first dud. The third torpedo passed astern. The target stopped and swung about 400 to her right. The destroyer made a 1800 turn away from us, circled around the far side of target and turned toward GATO down the approximate track of our #3 torpedo. Meantime, the smaller merchantman also swung right. This we only noted while swinging to observe the other escort. The latter was just starting to turn in our direction when observed. GATO went deep at that time.

1306(K) First of seventeen depth charges, fourteen of which were dropped in eight minutes.

NOTE: The bethythermograph showed a sudden four-degree temperature drop at about 240 depth. This is the greatest we have observed.

1339(K) Secured from silent running, depth charge attack, and battle stations, as the echo ranging had become very faint. Based up to 200 feet.

1413(K) Three depth charges, not very close. Eased down to 275 feet.

1817(K) Surfaced and proceeded toward western part of area. Today's attack was southeast of Truk so assume next target will approach from southwest.

Noon Post - Lat. 5-28 N., Long. 152-14 E. Miles run 209, Fuel used 3,388 gal.

9 October 1943

Patrolling about 60 miles southwest of Truk.

0613(L) Submerged at daylight.

— page 158 —
1903(L) Surfaced and patrolled along middle latitude of area in western half.
    Noon Posit - Lat. 5-48 N., Long. 150-24 E.
    Miles run 128. Fuel used 366 gal.

: 10 October 1943
    Tiding on southwest approach to Truk.
    Submerged at daylight.
    Surfaced in poor visibility and patrolled at slow speed.
    Received orders if can make it undetected to get down south of New Ireland on the 12th.
    From our present position, we would need 25 knots, so we continued our present plans.
    Noon Posit - Lat. 6-10 N., Long. 151-30 E.
    Miles run 90. Fuel used 579 gal.

: 11 October 1943
    Submerged.
    Surfaced.
    Noon Posit - Lat. 4-47 N., Long. 149-51 E.
    Miles run 151. Fuel used 1,540 gal.

: 12 October 1943
    Sighted three ships, bearing about 350° relative, angle on the bow 70 starboard, distance about 8 miles.
    Radar had not picked them up.
    Moon was nearly full and behind us. Commenced turning with full rudder and flank speed; but before we completed turning, the leading ship commenced flashing a signal light. GATO submerged to radar depth. Lost visual contact which was not regained. Believe now that targets changed course directly away. Their speed was about 20 knots.
    Surfaced and ran on their last known course for a half-hour, then gave up.

: 0617(L) Submerged.
: 1910(L) Surfaced.
    Noon Posit - Lat. 4-59 N., Long. 150-00 E.
    Miles run 97. Fuel used 736 gal.

: 13 October 1943
    Submerged.
    Surfaced and patrolled back and forth.
    Assigned an 80,000 square mile area from one north to seven gash fifteen north and from one four eight to one five two.
    Our spot is on the middle longitude of this area.
    Noon Posit - Lat 4-58 N., Long. 150-01 E.
    Miles run 76.5. Fuel used 451 gal.

: 14 October 1943
    Patrolling in assigned area southwest of Truk.

- 7 -

— page 159 —
0618(L) Submerged.
1913(L) Surfaced.
2100(L) Set course east to cross our area, t:us cutting all approaches to Truk.
Noon Posit - Lat. 5-00 N., Long 150-00 E.
Miles run 76.9, Fuel used 457 gal.

15 October 1943
Patrolling on east-west course, south of Truk.
0607(L) Submerged.
1907(L) Surfaced.
Noon Posit - Lat. 4-58 N., Long. 151-43 E.
Miles run 111, Fuel used 635 gal.

16 October 1943
Patrolling on the Truk to Rabaul line.
0607(L) Submerged.
1856(L) Surfaced.
Noon Posit - Lat. 5-35 N., Long. 152-13 E.
Miles run 110, Fuel used 548 gal.

17 October 1943
0607(L) Submerged.
1901(L) Surfaced. The range feature of our Sf radar is now inoperative. It picks up pips, but the range has to be estimated.

1945(L) Radar picked up three objects due south of us (dead ahead). Put these stations, Could never see targets. Went to battle stations, could never see targets although we closed range to 7,000 yards.

2050(L) Lost radar contact although range had been closing.
2104(L) Secured from battle stations and commenced patrol-ling on two engines astwart the target base course.

2345(L) Sighted 3 small ships dead ahead. Noted that all were about the size of sub chasers. Obviously had to be avoided. Reversed course, opened range, and circled to eastward.
Noon Posit - Lat. 4-36 N., Long. 151-36.5 E.
Miles run 113,14, Fuel used 540 gals.

18 October 1943
0803(L) Submerged.
1800(L) Sighted target, but were just far enough from track so that a high speed approach failed to get us within range. However, a long tracking exercise gave their course (300° T.), speed (12.5), and formation. The two AK's kept a good line of bearing 000° T. One was about 8,500 tons, with four goal posts, one stack, very neat, and about one-fourth loaded. The other, of about 7,000 tons had three goal posts and seemed about half loaded. The destroyer, patrolling across astern of the marsus, was identified as of the Fubuki class.

— page 161 —
19 October 1943 (Cont.)

The destroyer, when the periscope got to him, had turned to his right, apparently for his regular trip across the for catfish stern. This put his broadsides to use. The swing hard left to bring stern tubes on the catcoyer.

Took another look at the targets. The large one was pointed about on the base course and was scuttling in the water on an even keel. She had increased her draft about ten or twelve feet, before we swung periscope to the DD. (It is really nice that the few seconds he was watched, seemed much longer.)

The destroyer was practically stopped and broadcast a CTA, distant,

— page 162 —
35-12N/16-3
CONFIRM TRAIL U.S.S. CAIO - Report of SIXTH WAR PATROL.

10 October 1945 (Cont.)
1945 (Lt) 3rd Raided and started back toward center of area.
2002 (Lt) Directed to come home via specified route.

Iron Posit - Lat. 04-10 N., Long. 149-40 E.
Lakes Run 141-32. Fuel Used 2,507 gal.

20 October 1945
Troceodine eastward across area south of Druk.
Submerged during daylight.
Radar picked up e-all ship, bearing 2100 T., distant 7000 yards. Visibility was poor, nothing could be seen. Commenced tracking. Operator thought it looked like a submarine, but so does a sub chaser.
Radar obtained only sporadic contacts, since the old tubulks have not been remedied. Through information was obtained, however, to fix this course at 340 and his speed at 12.5. (We tracked for two hours.)
Iron Posit - Lat. 04-45 N., Long. 151-38 E.
Lakes Run 137. Fuel Used 826 gal.

21 October 1945
I. Reconnaissance was scheduled for 0020, so we arranged to be in position just prior to that time.
Submerged 15 degrees on sternboard bow of target, range 8000 yards. Commanded approach.
Narar could not pick up target, so went to periscope depth.
All three sound devices gave continuous bearings.
Saw target for first time, decided it was a submarine.
Iird three torpedoes on 90° track, range 2500, using Vogo 4 knot spread.
To hits.
0030 (Lt) Three explosions. Presumed to be our spent torpedoes.
0104 (Lt) Seeing or hearing nothing, surfaced and found nothing. Set course for homeward routing line as directed.
0612 (Lt) Submerged.
1215 (Lt) Submerged.
1302 (Lt) Submerged.
1015 (Lt) Submerged.
Iron Posit - Lat. 04-00 N., Long. 154-02 E.
Lakes Run 160.9. Fuel Used 2,602 gal.

- 11 -

— page 163 —
33212/A16-3

CONFIDENTIAL U.S.S. SAC - Report of STUART JAR PATROL.

22 October 1943
Enroute Tulaçi, on surface.
1050(L) Submerged on sitchin plane bellowed to be a Hudson.
1115(L) Surfaced, all clear.
Iron Posit - Lct. 0C-54 S., Long. 154-32 S.
Hiles Run 324. Fuel Used 4,007 gal.

25 October 1943
Enroute Tulaçi, on surface, in bombing restriction
lane.
Iron Posit - Lat. 5-53 S., Long. 187-55 S.
Hiles Run 235. Fuel Used 5,365 gal.

25 October 1943
Enroute Tulaçi.
0542(L) Made trim dive, surfacing at 0557(L).
0745(L) Sighted Liberator patrolling on parallel course
(190° T.), distant 10 miles abeam. It maintained
its course.
0910(L) A Liberator investigated us. No exchanged records.
1121(L) Passed U.S.S. LCI(L) Northbound. Exchanged
recognition and pleasurebrier.
Iron Posit - Lat. 12-57 S., Long. 157-36 S.
Hiles Run 316. Fuel Used 4,069 gal.

16 October 1943
Enroute from Tulaçi to Ziribana.
Sent the nicht avoiding imaginary ships picked
up by radar. At one time, had to use hard right
rudder and flank speed to avert an imaginary collision.
Also had a "periscope" which tracked at about 10
knots. Believe we are just getting the radar home
in time.

- 12 -

— page 165 —
35. TARGET
(a) Pearl to Johnston (6 - 3 September): -
    Clear, moderate NE tradeswinds.
(b) Johnston to Nakin (6 - 12 September): -
    Generally clear, but occasional showers.
(c) Nakin to Kauru - Ocean Island area (12 - 14 September): -
    Cloudy, with occasional squalls, moderate sea.
(d) Kauru to Thulagi (15 - 19 September): -
    Cloudy, moderate sea.
(e) Thulagi (19 - 20 September): -
    Hot and dusty.
(f) Guadalcanal (19 - 20 September): -
    Hot and dusty.
(g) Thulagi to Bougainville (21 - 22 September): -
    Squally, overcast, wintry.
(h) East coast Bougainville (23 - 26 September): -
    Threatening, generally overcast, local thunderstorms, muffled waters.
(i) Bougainville to Thulagi (26 - 29 September): -
    Game as Thulagi to Thulagi.
(j) Thulagi to Thulagi (1 - 6 October): -
    When clear of Solomons, encounters glassy sea, until 5° north of equator. Cloudy at dusk, otherwise generally clear. No wind. At 5° latitude, a ruffle appeared, and the clouds remained most of the day and night.
(k) Area south of Thulagi (6 - 21 October): -
    Very changeable - frequent local rain squalls. Brilliant moonlight, often cloudy over quite suddenly. Sea usually rufled.

4. TIDAL INFORMATION:
   It appears that the daily tides cause a corresponding movement in and out of the gaps between reefs on the east coast of Bougainville.
   In addition to the above, we believe there is a permanent northwest-southeast current parallel to this coast.
   South of Thulagi from lat. 4 to 6, there was a current of approximately one knot, invariably setting southeastly. (Though to cause non-contact it not allowed for.)

5. NAVIGATIONAL AIDS:
   None noted.

— page 166 —
6. NAVAL SHIPS SIGNED

| DATE | TIME | LAT  | LONG  | COURSE | SPWED | REMARKS                                                                 |
|------|------|------|-------||-------||
| 23   | 0208 | 105-44| 3.155-32| 005   | 15    | Corvette or small DD with escort                                 |
| 27   | 2255 | 06-57| 3.156-24| 300(2x)| 17    | AK with escort                                                          |
| 8    | 1134 | 05-27| 3.156-24| 350   | 9     | 2 AK, 1DD, 1 other escort                                          |
| 12   | 0101 | 05-27| 3.156-24| 200   | 20    | 2 unidentified                                                      |
| 17   | 2345 | 05-12| 3.156-24| 355   | 13    | 2 SC, 1 aux. patrol                                                      |
| 18   | 1000 | 02-45| 3.156-24| 300   | 12.5  | 2 AR, 1 DD                                                             |
| 21   | 0022 | 03-22| 3.156-24| 340   | 12.5  | 1 SS                                                                  |

7. ALIGNMENT SIGNED

| DATE | TIME | LAT  | LONG  | TYPE | COURSE | ALT | REMARKS                                                                 |
|------|------|------|-------|------||------||
| 18   | 1140 | 07-15| 3.156-24| B 2 | 2400 | 3000 | Hot identified                                                      |
| 18   | 1730 | 07-59| 3.156-24| L 2 | 2000 | 2000 | Exchanged talk                                                      |
| 22   | 0129 | 06-47| 3.156-24| L 2 | 2000 | 3000 | Bombed GATO                                                         |
| 26   | 0825 | 06-06| 3.156-24| L 2 | 2000 | 2000 |                                                                        |
| 28   | 0710 | 06-06| 3.156-24| L 2 | 2000 | 2000 |                                                                        |
| 28   | 0712 | 06-06| 3.156-24| L 2 | 2000 | 2000 | Dropped 2 bombs                                                      |
| 25   | 0647 | 06-02| 3.156-24| L 2 | 2000 | 2000 |                                                                        |
| 25   | 0745 | 11-45| 3.156-24| L 2 | 2000 | 2000 | Passed by                                                          |
| 25   | 0910 | 12-07| 3.156-24| L 2 | 2000 | 2000 | Exchanged sigs.                                                      |

NOTE: - This does not include the navy air traffic over Tulagi and Guadalcanal.

-15-

— page 168 —
9. ATTACK NUMBER 2 (cont.)

ATTACK NUMBER 2(b): - Seven minutes after attack number 2(a), fired two after torpedoes at the destroyer which had been escorting. To hits were obtained. Range 2000 yards. Estimated draft 12 feet. Depth sooting 21 ft. Track angle swinging. Gyro angle 150. No spread. Piring interval 20 seconds. Missed because the Commanding Officer mis-guessed what the destroyer would do. (Thought he would head for us. Instead, he swung past and then swung back to us.)

ATTACK NUMBER 3: - On 21 October 1943, fired three bow torpedoes at a submarine in a night periscope and sound attack, after two hour tracking run. To hits were obtained. Range was 2500 yards. Draft was estimated 17 feet. Torpedoes set a 12 feet. The track was 90 degrees starboard. Gyro angle was 350. Speed tracked 1.5 knots. Used a 10 second firing interval with a Voge 6 knot speed spread. Actually fired on sound bearings as he became indistinct through the periscope. Sound bearings had checked right on with periscope and plot up to a few seconds before firing.

9. ATTACK NUMBER 1 (continued):

(a) The Commanding Officer (CO) the impression that the depth charges dropped after our attack will were merely to keep us down while the convoy was escaping. Escorts used echo ranging.

(b) The Fubuli class DD made an excellent drop (after attack, on October 15th). The torpedoes were not contact with us although we were at 200 feet, running silent on evasive courses. Delisve it was he that dropped the carbide marker which we recovered at the scene. He did not use echo ranging.

10. LADDER DESCRIPTIONS:

(a) CHIRO COMPASS
On 29 September, the vacuum gauge on the south rotor indicated loss of vacuum, and the rotor commenced to heat up. It was secured immediately. The entire south rotor was replaced in Tulagi by one borrowed from T.A.S. DUTCH. Shortly after getting underway, the novelty installed rotor showed a drop of

— page 169 —
35-12N/AL6-5
CONFIDENTIAL U.S.S. GATO - Report of SIXTH WAR FABRIC.

10. MAJOR DEPOTES (Cont.)

(a) GATO CC PACS (Cont.)
about 2 inches of vacuum. It was slowed down and re-raised its vacuum. Although the reduced speed induced a slight error, the compass was used throughout the patrol in this condition.

(b) S.J. RADAR
"Startin' on 12 October, the performance of the S.J radar became erratic. Although rain squalls were picked up at great distances, three large vessels (CL) were not picked up at 6 miles. Then the range step disappeared. Then bearings became inaccurate. Finally, it began picking up imaginary targets. It is not believed that there is an individual trouble, but various minor correctable items. Among these are a defective cutwater transformer in the range unit and a defective crystal holder in the range tank. We are possible, parts were replaced or repaired, but a complete overhaul is indicated.

(c) FAITH
This becomes a major defect because of the military factor involved. A white powder formed under the flare island paint job. This forced off the paint in large areas, leaving a bright white surface which seemed almost phosphorescent in the moonlight.

11. REARING

(a) HEALTH
The crew was normally healthy. There were four sick days. Three men had a total of six boils among them. There was a gratifying absence of colds and sore throats.

(b) TERRITORY GRADINGS
Distinct temperature drops were found while going deep for both depth charges. On October 8th, there was a sudden four-deep drop at about 200 feet. On October 19th, it was found to be at 180 feet and was a bit more than four degrees.

(c) POINT LAND
Our single track routing seems a bit risky.

- 18 -

— page 171 —
FF12-15(72)/A16-3/Pk
:  SERIAL 0327
:  CONFIDENTIAL
:  From:  The Commander Task Force SEVENTY-TWO.
:  To:  The Commander in Chief, UNITED STATES FLEET.
:  Via:  (1) The Commander, THIRD FLEET.
:  Subject:  U.S.S. GATO (SS212), Report of Sixth War Patrol;
:  comments on.

1. The GATO departed Pearl Harbor for her Sixth War Patrol on 6 September 1943, following a two months overhaul in the Navy Yard, Mare Island for repairs to battle damage. Refueling at Johnston Island, she proceeded enroute patrol area via vicinity MAKIN, OCEAN and NAURU Islands with outbound incident. On 16 September she was ordered to TULAGI for special mission arriving 19 September. The period 20 - 29 September was spent in preparation for and accomplishment of special mission off East Coast of BOUGAINVILLE. Departing TULAGI again on 30 September GATO proceeded to patrol area covering southern entrance of TUNK. Her first contact was a northbound convoy of two medium freighters under escort of a destroyer and sub-chaser, on 8 October. GATO attacked submerged, firing four torpedoes at the larger freighter, Latitude 05-28N, Longitude 152°-14' E. One torpedo was definitely seen to hit the target but was a dual as no detonations were heard. Escorts attacked with depth-charges and convoy escaped into TUNK. GATO's second contact on early morning of 12 October with three unidentified ships was fruitless when convoy made a radical course change away indicating GATO had been sighted prior to submerging on a night of full moon. Visual contact lost and never regained. 17 October three sub-chasers on anti-submarine sweep were sighted and avoided. The fifth contact on 18 October was a valuable 3,600 ton freighter with smaller freighter under convoy of one FUBUKI class destroyer. After tracking for several hours, GATO made a submerged night approach, firing three torpedoes at each of freighters. One hit was seen in each and a third torpedo detonation heard. Latitude 02°-45'N, Longitude 151°-30'E. The larger maw was observed to stop and settle to 8 - 10 feet on even keel. GATO turned her attention to escort, firing two torpedoes in an attempted "down the throat shot" but missed as destroyer swung away. Depth-charge attack followed but no damage. Surfacing two hours later, no trace of convoy or sinking could be found except large oil slick. She searched for convoy following morning with no results. On 19 October recalled to base. Enroute she encountered northbound enemy submarine on 20 October firing three torpedoes in a night radar and submerged sound attack.

— page 172 —
1. Entered TULAGI 25 October and partially refueled, arriving BRISBANE after an uneventful trip on 28 October. Fifty days were spent on patrol, eighteen in patrol area. She fired fifteen torpedoes with three hits and one positive dud.

2. Torpedo performance again resulted in an enemy ship escaping undamaged after being hit. Lack of positive evidence prevents a "sunk" assessment of the large maru hit on 19 October. While realizing the Commanding Officer had already counted her as sunk, it would have been better to send those two torpedoes to finish her off instead of trying to outguess the maneuvering escort.

3. The Commanding Officer states that to get into position south of NEW IRELAND resulting from orders received on 10 October would have required twenty-five knots. Necessity for the use of the order resulted from FETO's inability to carry GATO's estimate was based on submerged daylight running whereas the situation indicated surface running which was feasible in most of the area involved. GATO's coverage throughout the patrol would have been better accomplished with more surface daytime running with periodic high periscope searches and without use of SD radar. The Commanding Officer will be indoctrinated to this effect for future patrols. Some of GATO's excessive open sea submerged running on this patrol is attributed to the necessity for training four new officers who replaced those detached during recent visit to United States.

4. This patrol is considered successful for purposes of award of Submarine Combat insignia.

5. The GATO is congratulated on the successful accomplishment of a hazardous mission and inflicting the following damage to the enemy:

DAMAGED
1. Freighter 8,500 tons
2. Freighter 7,000 tons
3. TOTAL 15,500 tons

JAMES FIFE.

DISTRIBUTION
Next page.

— page 173 —
FF12-15(72)/A16-3/Pk
:  Serial 0327
:  CONFIDENTIAL
:  Subject:  U.S.S. GATO (SS212), Report of Sixth War Patrol;
:  comments on.

DISTRIBUTION:
:  Cominch (Advance copy - 2)
:  VONO
:  VOPNAV (Op-23c)
:  Com 1st Flt
:  Com 2nd Flt
:  Com 7th Flt (2)
:  Comsubs 1st Flt
:  Comsubs 2nd Flt
:  Comsubs 7th Flt
:  CSS 6, 8, 10, 16, 18
:  CSD 81, 82
:  CTF 72 War Patrol Summary
:  Oinc, S/M School, N.L. Conn. (2)
:  Flt Radio Unit, NELBOURNE
:  All SS TP-72 (Not to be taken to sea - BURN)
:  GO FEW (file)

— page 174 —
1803
: 20 NOV 1943
: 2ND ENDORSEMENT ON
: USS GATO (SS212),
: Report of Sixth War
: Patrol.

From: The Commander South Pacific.
To: The Commander-in-Chief, United States Fleet.
Via: The Commander-in-Chief, U.S. Pacific Fleet.

Subject: U.S.S. GATO (SS212), Report of Sixth War Patrol;
Comments on.

1. Forwarded. The Commanding Officer, officers and
crew are to be congratulated on the damage inflicted on the
enemy.

ROBT. B. CARNEY,
Chief of Staff.

— page 175 —
212/16-3
DECLASSIFIED

U.S.S. GATO

c/o Fleet Post Office,
San Francisco, Calif.,
10 January, 1944.

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

Via: The Commander Submarine Division EIGHTY ONE.
The Commander Submarine Squadron EIGHT.
The Commander Task Force SEVENTY TWO.

Subject: U.S.S. GATO, Report of War Patrol number
Seven.

Enclosure: (A) Subject Report.
(B) Track Chart.
(C) Five Naval tactical time plots of
Attacks.

1. Enclosures (A), (B) and (C), covering the
Seventh War Patrol of this vessel conducted during the
period 18 November, 1943., to 10 January, 1944., are
submitted herewith.

R.J. POLY.

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C

BY: O.P. 0962E DATE: 7/6/44

DECLASSIFIED

— page 176 —
1/1

SS212/16-3
CONFIDENTIAL
U.S.S. GATO - Report of SEVENTH WAR PATROL

(A) PROLOGUE

Arrived BRISBANE AUSTRALIA from sixth war patrol on 28 October, 1943. Received routine refit by Submarine Repair Unit. No major items of overhaul were undertaken. Not depermed or wiped. Lookouts, Fire Control repair party and radar operators received practical instruction. Approach party made practice runs alongside dock, observed by Commander Submarine Division EIGHTY TWO. Hade test dive for leaks in BRISBANE River.

(B) NATIVE (all times "L")

18 November, 1943.

0800 Departed BRISBANE AUSTRALIA. Commander Submarine Division EIGHTY TWO temporarily on board to conduct training exercises. Conducted sound test and gun firing in HORIZON RIVER.

1500 Reflected rendezvous with U.S.S. SC 1123, (our escort and target), at examination vessel, and proceeded to sea thru swept channel.

1907 Hade trim dive followed by two practice radar approaches.

19 November, 1943

0600 Commenced submerged periscope and sound approaches.

1100 Made day radar approach.

1155 Prepared for simulated air attack but R.A.A.F. planes failed to appear.

1300 Escort made simulated D.G. attacks until 1600.

1600 Conducted exercise in "down the throat" attack on escort. In subsequent evasive tactics went to test depth as prescribed. No defects.

2000 Jomeneced night chase and simulated surface attack.

-1-

BIGLOTTE (L)

— page 177 —
2212/16-3
CONFIDENTIAL U.S.S. CAIO - Report of SEVENTH WAR PATROL
19 November, 1943 (Cont.)
2205 Secured from exercises. Proceeded into MORTON BAY to transfer O.C.E.
20 November, 1943
0246 Transferred Commander Submarine Division EIGHTY TWO to Pilot Examination Vessel, MORTON BAY, and proceeded to sea.
0435 Joined escort and proceeded along prescribed route.
0746 Commenced exercise in daylight end-around run.
1328 Simulated firing six torpedoes.
1350 Surfaced.
1345 Escort received orders requiring her to depart. Cancelled the only remaining exercise (Sound approach by escort), and released her.
1349 Set course along prescribera route.

21 November, 1943.
Enroute TULAGI. Made training class.
22 November, 1943.
Enroute TULAGI.
0004 Shifted steering to auxiliary gyro. Master gyro losing vacuum.
0532 Commenced steering by master gyro, having reduced the speed by setting latitude correction to 50°, preventing further loss of vacuum. Made training drives by section. Engine induction leaks (See par. "H").
1840 SJ radar out of commision (See par. "H")

23 November, 1943.
Enroute TULAGI. Made only one training dive as radar parts fill the conning tower. Radar not fixed.

-2-

ENCLOSURE (..)

— page 178 —
24 November, 1943.

C500 Effected rendezvous with escort, U.S.S. SC 728, and proceeded toward TULAGI HARBOR.
0900 Located radar casualty and commenced repairs.
1010 Moored to station fuel barge, TULAGI, and commenced fueling.
1230 Completed fueling but our radar went out again. Turned our escort over to PEBO, which was ready to depart. Sent his departure report and predicted positions. Notified Commander Task Force SEVENTY TWO of actions, and continued work on radar.
1700 Radar back in commission. Too late to start for point WHITE. Requested escort for dawn tomorrow. Sent predicted position to Task Force Commander.

25 November, 1943.

0550 Underway from TULAGI, escorted by U.S.S. SC 724. 1300 Off CAPE ASTROLABE. SC 724 obligingly stood by while we made trim dive.
1230 Relocated escort and sat course through bombing resorction lane on 3 engines.
1525 Sighted Catalina bearing 010°T distance 15 miles course 200°. Exchanged recognition signals.
1621

— page 179 —
26 November, 1943 (Cont.)

1523 Surfaced and proceeded on 4 engines.

27 November, 1943.

Prepared Northward toward patrol area on 4 engines.

10:34 Sighted unidentified plane 10 miles on port quarter bearing 070 course 310. Made quick dive. No indication of sighting GATO.

10:55 Surfaced and proceeded on all main engines.

22 November, 1943.

Inclined westward on 4 engines.

06:11 Made trim dive.

07:11 Sunk.

Crew: 4

Towed: 1-20 NORTH Long.

[END OF TRANSCRIPTION]

1943 Received ATONS contact report and altered course accordingly to make carllost contact with convoy.

29 November, 1943.

C115 Received RATONS contact report, and adjusted our course. It is to be noted that it takes 3 hours to relay those contact reports via the shore stations, as we required to do. (Can rely interoprt if we guess which of the ship crew requirements he will use). In this case we were at top speed for the three hours in the morning direction.

0700 Made 15 minute trim dive.

- 4 -

ENCLOSURE (A)

— page 180 —
1523 U.S.S. RAY. Closed hin, exchanged ro- portion, calls and information. Agreed to such different speed circles to the North- 1. 1709 Fired three torpedoes from forward tubes bo- foro losing depth control. Target was one of three cargo vessels escorted by two now locking sub chasers. As we fired the boat came up rapidly and it was necessary to use high spood to prevent bombing. Saccot was heading for us at high spood, so when the torpedo was inadvertently pulled under, decided to go doop. 1711 Two torpedoes detonated. They could have been hits. (But not day we saw the target un- damaged) Last seen headed fair for target but smoking a hoavy white cloud. 1713 Two depth charges. Vory closs. In fact all 25 charges dropped on this attack showed that those oscorts are quite proficient. Sound conditions were excellent and the oscorts never soomed to lose contact. The attack was un- hurried and when they decided to drop it was obvious that they had all information except our depth. We wore wall shakon up, and de- volpod noises in rudder shaft and storm planos. Also the main induction and engine induction valves wore lifted off their soats. Forward trin dovolpod a slow leak. 1622 Last depth charge. Escorts drew away while still pinging directly on us. This soomed strange until it was learned later that RATON had pur- posely closed the oscorts on the surface to draw their fire and attention away from us.

5

ENCLOSURE (A)

— page 181 —
29 November, 1943 (Cont.)

1900 Secured from silent running and reloaded our tubes.
1950 Surfaced and took up chase along best estimate of base course.

30 November, 1943.

Chasing, then searching from flank for the convoy.
0845 Sighted what was probably U.S.S. RAY about 10 miles ahead on almost the same course as GATO. She gradually drew off to Northward.
1045 Had another glimpse of U.S.S. RAY thru high periscope.
1247 Sighted smoke bearing 352FT. Closed at best speed.
1324 Masts appeared. It is our convoy. Commenced and-arranged run. Alternate color periods and rain squalls made it difficult to maintain contact without being caught in too close.
1730 Submerged 13 miles ahead of convoy, and commenced approach. It is noted that our target of yesterday, a light had made twice as much smoke as yesterday.
The three MARUS were almost abreast and their Zig Zags indicated that we were exactly on the base course. The final Zig put their loft wing ship directly at us, giving GATO excellent track angles on the other two. Decided to fire first at the best ship. She was heavier than the others, having an extremely broad beam, two goal post masts and two single masts. Estimated her tonnage 9,000 tons. She had a good paint job of dark gray, and bore the number 690 in white on her side. Rosenblad in every observed detail the KANSAI MARU. Intended to fire four torpedoes at her and two at the 6,000 tonner next in line

- 6 -

ENCLOSURE (A)

— page 184 —
5 December, 1943.
Conducting search on the PELWES - RABAUL route.

6 December, 1943.
Continuing search. Visibility poor. Frequent rain squalls.
0707 Submerged for 2 hours to service torpedoes.

7 December, 1943.
1150 Radar detector indicated a foreign radar in the vicinity. Submerged.
1201 Put radar detector antenna above water, obtaining no extract. Surfaced. All clear.
1215 Deteriorated that above was false contact (internal)

8 December, 1943.
0130 Sighted properly illuminated hospital ship bearing 100°(T) distant 8 miles, loading toward TINGWON. Sailed at the operating hat not picked it up. Closed to test radar and to note any suspicious movements on the part of the hospital ship. Unsuspecting a both control. Resumed search.
1530 Sighted mast with port scope, bearing 045°(T) distant about 12 miles. Commenced tracking and running around end track of target, and closed on overto counter.
1732 Submerged on estimated track of target, and closed on overto counter.
1800 Targets are 2 MARUS with E escorts. One MARU is 6,000 tonner with 3 gal posts(out down from 4). Other MARU is 4,500 tonner with 2 stick masts. Neither could be called ship-shape. One escort is the now, clipper bow type, of our recent acquaintance. On studying him for the third time, believe his one gun

ENCLOSURE (A)

— page 185 —
8 December, 1943 (Cont.)

is a 40 mm. The other escort is a clumsy, blunt
nosed affair which pings as well as the bost
of them.
1815 Went to battle stations and commenced approach.
1920 Despite our use of spool, targets increased
our distance to track (We should make every
effort to complete these attacks before the
time for his dusk charge of base course).
1922 Commenced firing bow tops at the MARUS which
were overlapping on bearing 240°(T).
Saw torpedoes running normally. Obscrvod
escorts. The new one turned toward us and
opened fire with the automatic weapon. The
shells landed close enough to hear sleeping
the water. They were tracers. Did not explode
as they hit the water.
1924 While watching the escort hoard two torpedo
explosions. Swung portspoo to targets. Saw
no gaysar. The near MARU (smaller) was
spinning around to the right and had covered
about 150 degrees when we sailed acer. The
far MARU pulled on ahead.
1926 Both escorts converging. Ordered doop sub-
mergence.
1929 First depth charge. This was close, but no
damage. A total of oloon charges were
dropped, individually. Their sound work
seemed lost efficient than usual. Lost us
frequently. By 2200 they had work well to
the south pinging reliably but searching
around the dial.
2005 Surfaced on 4 crginos. Nothing in sight.
Commanded search to westward on all crginos,
rotcading enroute.

- 10 -

ENCLOSURE (A)

— page 186 —
9. FEBRUARY, 1945.

(Conducting rotating search curve for convoy. By mid afternoon and covered all courses from COORD(T) to 230(T) (Westward) and speeds from 6 knots to 6.5 knots. We had also assumed a two hour delay and courses from 250(T) to about 200(T). At estimate of the fuel situation showed that we could just take TULIP on three courses. Also we can rendezvous at CAPE ASTROLABE at dawn December 13th (by rail, conveyors and dogging liberators). Air hestitation here or continuation of the normal we will cease us at least an additional 12 hours away from station. Set course for TULIP. Identify task Force Commander.

2140  Focused subs serial to TULIP.

10. December, 1945.

Report: TULIP for fuel. Fubarized in sighting, identified plane bearing 135° from 000 degrees to 180° (which is the exact line of visibility.

1430  Started and continued.

11. December, 1945.

Enroute TULIP. Transmitted the proscribed crew-carry position and weather, along with request that all-call and torpedo crane be available; (we have only used forward tubes to late).

12. December, 1945.

Report: thru bombing restriction lane. Sighted B-17 bearing 140° (distant 11 miles.

- 11 -

ENCLOSURE (A)

— page 187 —
12 December, 1943 (Cont)
paralloling and ignoring GATO.
1445 Sighted Catalina bearing 250°(T), distant 10
miles, altitude 2500 ft, course 160°(T). No
evidence of sighting GATO. We took no action.
2058
Librator appeared in moonlight crossing our
bow two miles ahead, whilst we swung left
(toward). We exchanged what were probably
recognition signals. No circled, blinking
unintelligible remarks. As he crisscrossed we
maneuvered radically at dark speed and full
rudder to show our confidence in him. Believe
he mistook us for U.S.S. B.L.A.O., which is on
gaged in some exercises with aircraft some
125 miles ahead. His transmissions appeared to
be programmed code words.

13 December, 1943.
0517 Joined escort (S.C. 516) off CAFE ASTROLABE
and proceeded toward TULAGI HARBOR.
1140 Arrived TULAGI with 2,000 gallons of fuel left
over, commenced shifting torpedoes and loading
lub-oil in drums. Fuel and torpedoes must be
taken separately in this port.
Unsuccessful in getting our S.J. radar to work.
The radar expert from the N.T.B. Base, Lt.
Flannagan, volunteered his services and worked
all night with our personnel.
1800 Completed loading torpedoes. Carried dock load
of lub-oil drums as we shifted to the fuelling
barge.
1900 Commenced fuelling.

14 December, 1943.
Fuelling in TULAGI.

- 12 -

ENCLOSURE (A)

— page 188 —
14 December, 1943 (Cont)
0630 When all our radar talent was stumped, sent message to Task Force Commander, giving the symptoms, and stating that we would depart without benefit of radar.
1030 Completed fuelling. Got underway, escorted by S.C. 518.
1500 Off CAPE ASTROLABE. Released escort and increased speed to 3 on-cin.
1638 Made trim dive.
1654 Surfaced and proceeded.
1816 Received some technical radar advice from Commander Task Force 72, some of which had not been tried as yet. Work continues.

15 December, 1943.

Enroute patrol area. Radar scans to be developing new allions. Received more radio advice on the subject. All items are acted upon.

16 December, 1943.

Enroute patrol area.

0803 In Lat 00-17-03 South, Long. 147-37 E sighted man on life raft. Took him on board. Appears to be a Jap soldier, adrift about 2 weeks (estimated), but decided to bring him along. He had the remains of a bird and a bit of bread. When he saw we were stopping he consumed a bottle of water. Protty well covered with salt water sores. His clothes wore in tatters. Wore a belt of part leather and part wobb. No weapon. His possessions, which will be delivered with him, comprise a wallet with

- 13 -

ENCLOSURE (A)

— page 189 —
16 December, 1943 (Cont)
Jap invasion monoy, snap shot of girl, pay-book, chop marks (seals).
Ha was given bath and treatment for the sores and
supervised feeding. Will be kept under guard.

17 December, 1943.
Proceeding westward on equator.
1600 Changed course to south to reach point where
the three traffic lanes to RABAUL meet (From
PELEWIS, WEWAK, and BALKAPAN.)
2030 Passed thru above monitored point and commenced
patrolling back and forth on two engines (Radar
still out of commission).

18 December, 1943.
Patrolling the junction of the PELEWIS, WEWAK
and BALKAPAN routes to RABAUL.
0653 Submerged as it was about time for the morning
air search to pass over.
0815 Surfaced and readjusted position for star
sights.
1900 The radar personnel fool that the radar is
ready to operate but must be tuned on a target
to get maximum sensitivity. Set course up the
BALKAPAN route toward KINITE ISLAND for that
purpose.
2335 Recorded order to inactivate the magnetic feature
of our torpedoes.
2336 Sighted KINITE ISLAND distant 5 milos. Commenced
trying to pick it up with radar. Succeeded at
about 6,000 yards and commenced adjusting.

19 December, 1943.
0031 Having tuned the radar to its best performance

- 14 -

ENCLOSURE (A)

— page 190 —
19 December, 1943 (Cont)
set course back to the Three-route junction.
Rousmed patrol.
Submerged to inactivate torpedoes.
Surfaced.
GATO directed to look for PELWES and SAIPAN
traffic to RABALU, as well as Tanker traffic
from the Southwest to TRUK. To fulfill this
large order, first set course up the RABALU -
PELWES line.
Sighted two unidentified planes bearing 035°(T),
course south, distant 10 miles, altitudes 5,000
foot. Submerged. Since it costs nothing, we
assume they saw us. Decided to go up the
"SAIPAN ROUTE" instead.
Surfaced. All clear. Set course toward
SAIPAN.

20 December, 1943.

On what we believe is the SAIPAN - RABALU route.
Submerged to work on torpedoes.
Surfaced.
Sighted smoke bearing 345°(T). Commenced
tracking.
Submerged on estimated track of target.
Battle stations. Targets in sight. One large
cargo vessel or tanker (9 to 10 thousand tons)
with 4 goal posts and engines aft. Would think
it a tanker but cannot see any pipe lines running
from and aft. Has cargo booms horizontally
housed. The other ship is just a cargo vessel
with a fair amount of passenger space. Two stick
masts, one stack, armed, estimated 6,500 tons.
The two escorts are the now type we have un-
pleasantly not recently.

- 15 -

ENCLOSURE (A)

— page 191 —
20 December, 1943 (Cont.)

Evory effort was made to reach position for a close shot at the large vessel, but the zigs during the latter stages loft us on the side near the smaller. Also thru no effort on our part the two MARUS lined up on the firing bearing.

17-31 Commanded firing bow tubes at the middle of the smaller target. After three wore soon running normal favored tho storm of same as that was tho boring of the middle of the large target.

17-33 While watching tho near escort for his first move, hoard tremendous explosion. GiTO was shaken. Swung periscope to target. The near one was blown up. Pelecos wore flying thru the air as high as 300 foot. The burst covered tho whole field of tho periscope. In a few seconds tho air cleared and all that remained of tho smaller MARU was one mast sinking rapidly at a large angle. Had a glimpse of the large ship still throe but could not toll much about it. Do not believe tho torpedoes had time to reach it yet. Foriscope worn under. Ordered deep submorqence (1733 L)

17-33 Two distant explosions (believed to be torpedoes), The sonic listening device had tho sound of a "going" ringing in the distance.

17-39 The first of 19 depth charges. This was tho worst depth charging we have ever received. Practically all of tho charges scored right on top of us and tho ship was taken violently with each. However tho GiTO took it very well. Those new escorts are too proficient. They spotted us accurately and stayed on, altho we wore at all times about 70 foot below our test depth. Thoy did not spool up to drop, but passed directly overhead at slow dollorbate

- 16 -

ENCLOSURE (A)

— page 192 —
20 December, 1943 (Cont.)

spoed. Also bolivo they may uso a fathomotor to detomino our depth. Nono of our "bag of triclos" was offoctivo in shaking them, for about two hours, when a slow gradual turn seemed to leave thon astorn.

1930 Sound gear dotted: the approach of a heavy rain squall. Both escorts are rotating thoir sound heads. Prepared for battle surface.

1942 Surfaced, heading away fror. The ocho ranging, in hecry rain squall. Radar shows nothing but that nay or nay not indidate clear fiold.

1943 Sot curos 310° for the "seaco" which is also tho bearing of tho ocho ranging.

2003 Slowed on approaching tho sceno of tho attack. Visibility very poor.

2016 A heavy explosion was hoard and felt througout the ship. Could not tell tho boaring or type.

2021 Observod blur on port bow, ostinated about : 1500 yards. (Pretty sure it was one oscort)

2022 Sound reports pinging 35° relative. Then saw tho other escort on that boaring distant 2000 yards. Swung hard right at flank speed. (Note that radar has nado no contact as yet).

2024 Drawing away from escorts who seem more surprised than we are. Radar, after being coached on, commoned crying rangos and boarings. (These are very experienced oporators too)

2032 One escort astorn fired one round, radar range 3,500 yards. Tho propollant charge is far from flashloss. The projectile is fused. It burst aboun, showing his fusr range exact, alovast on a bit high and doflection three nills to right (estimated).

- 17 -

ENCLOSURE (A)

— page 193 —
2023.5 Sottled on course for TINGWON (Most likely course of big MARU).
2033 Situation ronsboled a five ring circus.
GATO was simultaneously:
(a) Outrunning the two oscorts.
(b) Trying to overtake the MARU.
(c) Relocating the forward tubes.
(d) Making some necessary minor repairs.
(e) Trying to dispose of one unexploded depth charge without blowing our rudder off.

2100 The prisoner and our language student (Lt. McGivorn) each copied the markings on the depth charge, after which it was lashed to the rubber boat and set adrift with a slow look. When last soon it was bobbing along in the path of our pursuers.

21 December, 1943.

Closing MESSAU ISLAND without overtaking the ship. Many items indicate that this ship was at least damaged, or possibly sunk. We submit the following for consideration:
1. The two ships were lined up on the firing bearing.
2. The near ship was hit.
3. The two additional torpedo explosions were timed exactly for the run between the ships.
4. Two hours after the attack, neither escort had left the seaco. In fact they were milling around, ping-

- 18 -

ENCLOSURE (A)

— page 194 —
21 December, 1943 (Cont.)

ing, at 2022 about 2 hours 40 min.
after the attack.
5. We covered the track from the scene
   to within sight of MUSSAL at about
   twice his speed than patrolld ath-
   wart his most likely track until he
   would have had more than enough time
   to reach the spot. No contact was
   made.
6. Our "prolific" air searches make no
   report that could be connected with
   this ship. In short, the GATO has
   convinced herself that she sank
   both ships in this convoy.

0530 On Lat. 1-00 South patrolling on East West
   courses.
0755 MUSSAL ISLAND boats 132° distant 36 miles.
0827 Dived to avoid unidentified aircraft boaring
   215°(T) distant 8 miles course 340, altitude
   1000 foot. Quito suro ho did not soo us.
   While submerged, serviced the torpedoes in the
   flooded tubes (aft).
1115 Surfaced and commenced retracing steps toward
   the scene of yesterday's attack.
1331 A small plane believed to be a float plane was
   dimly soon in the haze boaring 320°(T) distant
   about 4 or 5 miles,altitude 1000 foot, curso
   about 120. GATO dived. We must assume she saw
   us.
1412 Surfaced and proceeded to intercept any traffic
   which may have been rerouted around the other
   side of MUSSAL ISLAND.

- 19 -

ENCLOSURE (A)

— page 195 —
22 December, 1943.

2100  Roachd the TRUK - MISSAAU traffic lane and turned northward.

23 December, 1943.

1158  Patrolling on the TRUK - RABAUL route.
   Sighted unidentified plane bearing 230°(T),
   distant 6 miles on course 13C. Submerged.
1226  Surfaced. Resumed patrol.
1240  High periscope had a bird of two nasts
   (well separated, as on two separate vassals),
   bearing 245°(T), well over the horizon. Could not
   be located by closing at high speed. Believo
   they were southbound destroyers which just reached
   our circle of visibility.
1317  Resumed patrol.

24 December, 1943.

0916  Patrolling across the TRUK - RABAUL route.
   Sighted plane probably a liberator but could
   not be sure. Bearing 090, heading south,
   distance 8 miles. GATO submerged for 14
   minutes.
1403  Lockout reported torpedo wake on port quarter.
   All ahead flank. Put tail to it and made
   ready after tubes. After discussion with tho
   lookout, decided that it was a wind slick with
   rain on it. Slowed, stopped, listened and
   proceeded.
1535  Sighted liberator on bearing 150°(T), distant 8
   miles, GATO exhibited one flare of proper
   color.
1755  Sighted liberator bearing 040°(T), distant 10
   miles. Remained on surface, tested S.D. radar,
   blinked identification signals. No answer,
   but no antagonism.

- 20 -

ENCLOSURE (A)

— page 196 —
35212/A16-3
CONFIDENTIAL U.S.S. GATO - Report of SEVENTH WAR PATROL

25 December, 1943.

Patrolling athwart the TRUK - RABAUL line.
1405 Sighted plane, too faint to identify boarring
260°(T), distant 10 miles course 340°(T).
Submerged.
1420 Surfaced, all clear, resumed patrol.

26 December, 1943.

Patrolling western detours of TRUK - RABAUL
line. No contacts.

27 December, 1943.

Patrolling as before.
0641 In first light of morning, sighted vessel
bearing 010°(T), distant about 4 miles.
Commending Officer thought it looked like a
destroyer. Others called it everything from
GATO dived and commenced approach.
0714 Made out that target was a submarine. Zig-
ging widely. We were just too far from the
track but kept approaching. In hopes of a
change in his base course.
0836 Abandoned approach. Decided to make end-
around. Lay doggo till he drew away.
0905 Surfaced and chased submarine.
0928 Sighted target dead ahead. Commenced working
around his starboard. Learned that it is
quite a delicate performance for one submarine
to keep a zigzagging submarine in sight.
When no zigs toward he really closes fast (and
vice versa). Also our need for engine over-
haul is obvious. Despite the tenderest of
care we cannot exceed our standard speed
(820 KW) without excessive smoke.

- 21 -

ENCLOSURE (A)

— page 197 —
27 December, 1943 (Cont.)

We made several attempts to work up speed but had to refrain.

Submerged ahead of target on his base course, and commenced approach. Identified target as I-62 class submarine, with three inch gun forward. Masts were partly housed.

Commoned firing four forward tubes from most portfoc position one could ask. Range was 2150 yards, track angle 90. We had his spood, long, and draft. Heard thrce of the four torpedoes running on the correct bearing. One went off at a tangent. Could so at least two tracks heading correctly. But nothing happened. Target was unconcerned, and well after the torpedoes should have hit so slowly changed course away.

Three torpedoes exploded (end of run) Decided we might be able to land a lucky thrce inch hit on him, and certainly drive him down, delaying his mission, while diverting our crews minds from the disappointment.

Battle surface. Closed target at full speed and commenced firing three inch at about 7500 yards. Second shot obscured target but he was still there when splash subsided. He submerged on the fifth shot. The sixth landed in his diving swirl. Coasted firing and re-ported course. Sent contact report, on aircraft circuit. Thon, thinking that this report, if DTD, would disclose the fact that Subs were using this circuit, decided to transmit a message on the sub circuit after a discreet interval. Had several things that should be said, anyway. Set course along the PELBWS track while transmitting (this is over 90° from the course we followed after the transmission).

- 22 -

ENCLOSURE (A)

— page 198 —
27 December, 1943 (Cont.)
1529 Sighted patrol plane. Not certain of type or nationality. Daps know our position, and we might direct one of our planes to the Jap sub so remained on surface, manning the AA battery. However the plane cloud-hopped and disappeared. Visibility deteriorated rapidly in driving rain, Radar not working. Lowered sound heads. Stopped for 10 minutes to listen. When C.O., and O.O.D., could not see cr hoar each other on bridge, made decision. Submerged. Manned sound gear. Copied radio messages on S.D. radar antenna.

28 December, 1943.

Patrolling on TRUK - RABAUL line. Submerged during rainstorm.
0210 Surfaced as storm slackened.
0834 Sighted plane, followed to bo 1librator, bearing 200°(T), distance 9 miles course northwest.
0931 Sighted 1librator bearing 080°(T), course across our bow (Southorly). Distance 8 miles. Pulled flare and exchanged identifications with 1lashing light.
1437 Sighted 1librator bearing 150°(T), distance 10 miles, altitude 4000 feet, course southwest. Exchanged recognition signals.
1508 Some plane returned. "We had just received several garbled transmissions on the plane radio circuit. Thought this plane was asking our position or trying to tell us something, but never achieved communications by light. He drew away.
1850 Abandoned the TRUK - RABAUL route, by direction, and headed for the RABAUL - PELEWS route at best speed.

- 23 -

ENCLOSURE (A)

— page 199 —
29 December, 1943.

On the RABUUL - PELERIN line.
0815 Si:hted smoke bearing 156°(T). Closed.
0821 Made out many masts. Set intercotping course.
0955 Masts bero 120°(T). Consider ourselves on
his track. Cano to his estimate course.
1010 Float plano apponred botwcon us and targets,
crossing track. GAITO divod, apparently un-
detected.
1053 Battle stations submerged. Sovon ships
visible. One is 10,000 ton transport, one
9000 ton froighter, three nodium MARUS and
two escorts, believed to be torpedo boats.
Zigging was radicall but no managed to placo
ourselves ahead of the contor, as desired.
Scloctod tho transport as target; Piring
position was dead ahead of tho 9,000 tonnor
on tho final position. Raised periscope for
final boaring. Float plano was zooming us.
Target had turmod to ram. Escorts wore
closing at high speed. Abandonned attack.
Carofully wont doop to avoid putting screws
into target which passed overhoad. (The
Commanding Officer does not favor tho light
gray paint).
1330 The soaring escorts while still pinching in
our direction (to koop us down) drow away
on tho base course. The convoy screws had
already faded in that direction.
1333 Made poriscopo observation to get last look
at smoke of convoy and chock direction.
Float plano was circling tho smoke patoh
boaring 282°(T). Wont to 100 foot and waited
for convoy to draw away (and take tho plano
with thon). Serviced our four torpedoes.

- 24 -

ENCLOSURE (A)

— page 200 —
29 December, 1943. (Cont)

1450 Surfaced on northerly course, hoping to pull
1500 The float plane appeared, It is a "JAKE".
1500 Since he had already sighted us and we had
1500 our AA battery manned, decided to give him
1500 a few bursts.
1500 Plane made diving approach, GATO oponad fire
1500 With two 20 mm. and one .50 cal., enveloping
1500 him in tracers. Well before his POLONSO
1500 point he pulled up in a stop climb, with
1500 surprise written all over both floats.
1500 In all, the plano came in five times, but on
1500 each approach he was met with a hail of rapid
1500 fire, and each time thought better of it.
1500 Altho no vital parts of tho plano were hit, ho
1500 received one stripe of .50 cal. holes in his
1500 starboard pontoon, and several scattered 20 mm.
1500 holes in his wings. Ho thon commenced circling
1500 out of gun range. At no time did ho fire any
1500 guns. GATO decided it was time for more planes
1500 to arrive from MUSSALI or MANUS. It must be
1500 understood that tho GATO did not surface to
1500 engage this plane for the fun of it, but to
1500 maintain tho contact. Tho attack was broken
1500 off when, in tho opinion of tho Commanding
1500 Officer, GATO had oponad the distance from
1500 the ADMIRALTIES enough to preclude tho arrival
1500 of surface craft before nightfall.
1556 Subnarged on course north and remained at 200
1556 foot until time for star sights.
1948 Surfaced. All clear. Chased after convoy, at
1948

— page 201 —
30 December, 1943. (Cont)
from last position of convoy toward PELWIS.
0537 Roachod convoy 9 kt. position circle. Made
short sweep to right of track (1 hour) to cover
slight deviations from base course, thon
commenced retiring search on left side of base
track.
1935 We had covered both sides of track for his
spoads 7 to 9 kts. and deviations of about
40° from base course, when Subs Serial
directed us to shift to another lano.
Set course and spood to comply.

31 December, 1943.
1606 Sarching tho northern detours of tho lano
from PELWIS to STEPPAH STRAT.
1606 Sichtod U.S.S. BALAO, on sano mission.
Closod, oexhangod recognition signals.
Sugcstod that sho cover tho northeast side
of track while GAITO covers southwest. Also,
since GAITO has no T.B.S. radio sot, that we
use tho ship shore circuit for contact and
coordination messages.
1544 Separated from BALAO. Proccodod to search as
agreed.

1 January, 1944.
1958 Sarching on route from PELWIS to STEPPAH
STR.IT.
1958 We had just drafted a message reporting that
our fuol on hand permits search until tomorrow,
whon we roccivod Subs 72 Serial directing
us to start for TULAGI at dawn tomorrow (if no
contact).

- 26 -

ENCLOSURE (A)

— page 202 —
1. January, 1944.
2. January, 1944.
3. January, 1944.
4. January, 1944.

---

**Text Transcription:**

```
SS212/A16-3
CONFIDENTIAL U.S.S. GATO - Report of SEVENTH WAR PATROL

2 January, 1944.

0700 Searching as before...
To contacts, 3st course for TULACI.
I roceeding toward TULACI.
2324 Directed to remain in the vicinity of the
Squator and lonqitude 154°E until further
orders (because of important friendly ship
movements between us and our destination).

3 January, 1944.

1728 Loitering at the above mentioned location.
Sighted unidentified plane, distance 10 miles,
altitude 3,000 feet, course 100°(T). Hado
quiet dive.
1020 Surfaced.

4 January, 1944.

COLL
Awaiting the passage of friendly Task Force.

1006 Sighted plane belonging to the friendly Task
Force of which we have been warned. Submerged.
1016 Board echo ranging. Decided not to play any
games with U.S. Destroyers. Pired smoke bombs
of proper colors. Sighted the friendly Task
Force. Description is omitted here for security
purposes.
1824 Surfaced and rewoived the passing of the
triumphant Task Force. Expanded one rod flare
and considerable horo worship.
1930 "Non all clear.

- 27 -

SINGLESTRING (A)
```

— page 203 —
5 January, 1944.
Proceeding to carry out Special Mission.
1115 Liberator passed on patrol bearing 1800 T.,
course 2700 T., distance 8 miles, altitude
5,000 feet. Showed flare and exchanged sig-
nals.

6 January, 1944.
Special Mission.

7 January, 1944.
Enroute TULAGI.
0219 Directed to join CERO before she reaches CAPE
ASTROLABE. She is to be proceeding slowly in
that direction, accompanied by a tug and sub-
chaser.

- 28 -

ENCLOSURE (A)

— page 204 —
35212/16-3
CERTIFICATE U.S.S. C-20 - Report of SEVENTH MAR RATROL

6 January, 1944.

Entrusted TULACI
0154
Gilted tug as expected but no CDR or Sub Chaser.
Took over an hour to convince tug captain that we
were Americans. He then informed us that the
CDR and escort were up ahead of him.
0330
Overtook CDR and exchanged recognition.
0523
A second escort appeared and reported to conduct
CAIO to TULACI.
1130
Arrived TULACI and commenced fuelling. A re-
presentative of Commander Task Force 31 was on
the dock waiting to confer.
This made it unnecessary for C.O.,
CAIO to proceed to GUADALCANAL. This saved one
day in CAIO's absence from patrol. Since they
have better charts than we have, our data was
taken for plotting on a very large scale.
Lieutenant Porter, who represented CTG 31,
plotted enough to assure us that our data is
satisfactory for the purpose.
1600
Deported TULACI for MILITARY DAY, escorted until
dark by S.O. 128C.

9 January, 1944.

Entrusted LILIE DAY.

10 January, 1944.

Entered MILITARY DAY for refit by U.S.S. FULFUL.

- 28a -

SIGLOCUNT (A)

— page 208 —
1
SS212/A16-3
CONFIDENTIAL
U.S.S. GATO - Report of SEVENTH WAR PATROL
(H) ATTACK DATA
U.S.S. GATO
TORPEDO ATTACK NO. 1
PATROL NO. 7
Time 1708 L
Date 29 Nov, 1943. Lat. 02-43,1 H Long.144-16,9 E

Target Data - Damage Inflicted

Description
Convoy of three MARUS of 7,000 to 8,000 tons escorted by two new type sub-chasers. MARUS in line formation on base course, zigging about 60° right am. left. Escorts patrolled on either beam of formation. Contact made by sighting smoke. Visibility was excellent.

Ship(s) Sunk None.

Ship(s) Damaged or Probably Sunk None.

Damage Deter- mined By
At first we believed hearing hits on one ship, but sighted all ships apparently undamaged the following day.

Target Draft 25' Course 110° Speed 9.5 kts. Range 3,700

Own Ship Data

Spoed 3 to 4 kts. Course 160° Depth 62' Angle 1 down to 3 up

Fire Control and Torpedo Data

Type Attack
TDC 1k, 3 Mod. 1, daylight periscope approach. Angle spotting regulators in automatic. VOGE
spood sproad usod.

Tubos Fired
#1 #2 #3

Track Angle
39°P 91°P 94°P

Gyro Angle
12° 8° 5°

ENCROASURE (A)

— page 209 —
35-12N/16-3
CONFIDENTIAL U.S.S. GATO - Report of SEVENTH WAR PATROL

(H) ATTACK DATA (Cont)
Dopth Sot 17' 17' 17'
Power High High High
Hit or Miss Miss Miss
Erratic No No No
Mark Torpodo 14-3A 14-3A 14-3A
Serial No. 25648 20206 25373
Mk. Exploder 6-1 6-1 6-1
Serial No. 6970 6968 5050
Actuation Sot Contact & Magnetic Magnetic Magnetic
Actuation Actual Unknown Unknown Unknown
Mark Warhead 16 16 16
Serial No. 2230 921 1767
Explosivo TPX TPX TPX
Firing Interval 0 6 soc. 7 soc.
Type Spread Speed 10,25 9,5 8,75
Sea Conditions Calm Calm Calm
Ovorhaul Activity Base Torpodo Unit - LEFT 80
Remarks The range was great. The son was flat. The torpedoes made smoke. Two probablo causos of tho niss are error in sono of tho C.O's cstinatos, or sighting and avoiding by tho target

ENCLOSURE (A)

— page 218 —
SS212/A16-3

CONFIDENTIAL U.S.S. GATO - Report of SEVENTH WAR PATROL

(H) ATTACK DATA (Cont)

| Field       | High Miss | High Miss | High Miss | High Miss |
||||||
| Hit or Miss |           |           |           |           |
| Erratic     |           |           |           |           |
| Mark Torpedo | 14-3A     | 14-3A     | 14-3A     | 14-3A     |
| Serial No.   | 39129     | 39366     | 39156     | 33956     |
| Mk. Exploder | 6-1       | 6-1       | 6-1       | 6-1       |
| Serial No.   | 12311     | 12315     | 12231     | 11483     |
| Actuation Sot | Contact - | Delay whcel rnovod | - | - |
| Mark Warhead | 16        | 16        | 16        | 16        |
| Serial No.   | 2285      | 2660      | 10117     | 3875      |
| Explosive    | TX        | TX        | TX        | TX        |
| Firing Interval | 0 | 9 soc. | 8 soc. | 11 soc. |
| Type Spread | Spood 15 | Spood 15 | Spood 11 | Spood 9 |
| Sea Conditions | Caln | Caln | Caln | Caln |
| Overhaul Activity | U.S.S. FULTON. | | | |
| Remarks | | | | |

Investigation showed that we used the wrong spread of two which were prepared for two different ranges.

- 42 -

ENCLOSURE (A)

— page 219 —
33212/16-3
CERTIFICATE U.S.S. G.T.O. - Report of SUBWAY WAR PATROL

(H) ATTACK DATE (Cont)
U.S.S. G.T.O. CUT ATTACK NO. 1. PATROL NO. 7.

Time 1428 L Date 27 Dec, 1943. Lat. 0-16 S Long. 147-30 E
Target Data - Damage Inflicted

Sunk Kono.
Damaged or
Probably Sunk Kono.
Damage
Deterimined
By Kono.

Details of Action
Pirate six rounds high capacity from 3"/50 cal.
gun using local control. Target was I-62 class submarine which
dived after being straddled. The average range was about
7,500 yards. Pirate was not returned. Target had been missed
with four torpedoes just previously (Terpode attack No. 5),
and was avoiding on the surface.

- 42a -

HOLCUM (L)

— page 221 —
1. Under soparato covor, data is submitted on the un- exploded depth charge which remained on our dock after the attack on December 20th.

2. It seems that the GATO after all her depth charging should be able to contribute materially to the fund of information on the subject. However, we found no evidence of any torpedo material. Sound conditions were good in all cases but this does not account for the improvement in their sound work. I would suggest that they come in for processing normally in sonic search, and his equipment is also improving. One strange feature was noted. Just before dropping the escorts did not spool up as they generally do. This provents us from employing the same procedure in evasion. Also a third roto was heard when only two escorts were searching. This may be a second sound head or a fathomotor.

(K) DEPTH CHARGE DAMAGE

1. Bulkhead #77 is out of line. When WT door is closed, you can soo thru bottom gasket and soat.

2. Outer hull dishad in aft. All old donto are doopend and thoro are about a dozen now onos.

3. Forward trin tank leaks. Probably a guago line or groase lino broken.

4. Twenty throo lights and two steam tight globos wero broken.

- 43 -

ENCLOSURE (A)

— page 222 —
5. Pressure guage on steering system (in torpedo room) carried away.
6. #1 Periscope olvation gear train broken, hair-linos out of place, and focusing adjustment binds badly.
7. Electric cables pushed in thru stuffing boxes in conning tower causing leaks.
8. Sixteen assorted prossuro guages jumped over thoir stop pins and are now out of calibration.
9. Both anoroid barometers are damaged informally.
10. Hull induction and Engine induction both flooded, and now leak steadily.
11. The unexploded depth charge landing on the center life line sheared off turn buckle, thon broke wooden dock plank.
12. General Alarm contacts closed in the shock.
13. General announcing system sustained electrical damage which wore ropirablo on the spot.
14. Diving Alarm thrown out of commission (Rcnodied)
15. Boy call system to bridge out of commission. Prossuro proof box ruptured.
16. Fort running 14gth globe broken.
17. Govrornor on #3 main ongino thruwn out of ad- justmont.
18. Many bulkhead stops, vonts ard valvos were opened from 1 to 3 turns.

- 44 -

ENCLOSURE (A)

— page 227 —
35212/A16-3
CONFIDENTIAL U.S.S. GATO - Report of SEVENTH WAR PATROL
(S) DURATION
Days Enroute Area 9
Days in Area (first visit) 14
Days Enroute to Base 3
Days Enroute to Area 5
Days in Area (second visit) 21
Days Enroute to Base 4
Days submerged 1
(T) FACTORS OF DURATION REMAINING
Torpedoes 5 (out of 28) 6,000 cal. 6 days. 14 days.
Limiting factor of this patrol: - Fuel would have
ended it in 16 hours, had the dispatch not done so.
(U) REMARKS
None.

HOLSURE (A)

— page 228 —
11 January 1944.

FIRST INSTRUCTIONS:
Seventh War Patrol of the U.S.S. G.N.O.

From: The Commander Submarine Division Eighty One.
To: The Commander in Chief, UNITED STATES FLAG.
Via: (1) The Commander Submarine Squadron LIGHT.
    (2) The Commander Task Force SEVENTY T.O.

Subject: U.S.S. G.N.O. - Seventh War Patrol.

1. The seventh war patrol of the U.S.S. G.N.O. has second since navy yard overhaul, was of 54 days duration, of which 35 days were spent in the area, in two installations of 14 and 21 days. The patrol produced 8 ship contacts, including one hospital ship and one submarine. Three out of 5 torpedo attacks were successful.

2. A normal refit will be accomplished by the Fulton and Sub Div 51 relief crew. Special attention will be given the S.J. radar.

3. The Commanding Officer, officers, and crew are to be congratulated for a successful patrol, and the damage inflicted upon the enemy.

N. WINTER, JR.,
By direction.

— page 229 —
15-16-3
Serial 09
LSEGND
FIRST ENDORSEMENT to
CO USS GATO Report of
7th Var Patrol.

CONTINUATION:
From: The Commander submarine Squadron EIGHT.
To: The Commander Task Force SEVENTY-TK.

Subject: U.S.S. GATO (SS-142) Seventh War Patrol - Comments on.

1. The seventh war patrol of the U.S.S. GATO was of fifty-four (54) days duration of which thirty-five (35) days were in the combat area. This patrol was characterized by aggressive action on the part of the GATO and by accurate depth charging on the part of the enemy. It is (8) contacts with enemy vessels were made, with a properly illuminated patrol ship. Two gun attacks were made, one against a submarine and the other against a plane. The latter attack, which is looked upon with disfavor as a general practice, was made in order to enable the GATO to proceed on the surface with a view of maintaining contact with enemy. Although only minor damage was done to the plane, he was driven off five times and damaged circled out of gun range. The GATO inflicted the following damage to enemy by torpedo fire: 9,000 tons and one of 6,500 tons, and probably damaged two AIS, one of 9,500 tons and one of 4,500 tons.

2. The GATO experienced particularly severe depth charging which resulted only in minor damage and some buckling of the hull plating. The accuracy of the enemy depth charging is sustained by the fact that the GATO surfaced with a dead depth charge on deck. The latter was disposed of by floating it away in a rubber boat. The observed torpedo performance was excellent.

3. The GATO will be given a regular standard refit by the U.S.S. PULTON.

4. The Commanding Officer, Officers, and Crew are congratulated on the completion of a very successful patrol.

W. H. DONNES.

— page 230 —
FF12-15(72)/A16-3/Pk
Serial 012
CONFIDENTIAL
3rd ENEMY SENT TO
GC CH 57 REPORT OF
Seventh War Patrol

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

Subject: U.S.S. GATO (SS212), Seventh War Patrol, comments on.

1. GATO sailed from BRISBANE on her Seventh War Patrol 18 November 1943. After two days training proceeded TULAGI arriving the 24th. Departed 25th, via route east of SOLOMONE to patrol area north of BISWARK ARCHITELACO. On 29th, sighted RAY and agreed on search plan for southbound convoy being trailed by RATON. First contact made in early afternoon. At 1709 L., fired three torpedoes at one mru of three with three escorts. No hits. Severely depth charged by escorts until RATON spurred night and drew them off. GATO chased convoy during night and following day. At 1820, 30th near 1°-56' N., 147°-23' E., fired four torpedoes at nearest ship, heard two torpedo hits and noises of ship breaking up. Severely depth charged, being driven down to 400 feet by force of explosions directly overhead. Searched further for convoy on 1 December but contact not regained. 2 - 8 December uneventful patrolling TINGWON-PELEW routes north of Equator. 8 December sighted properly illuminated southbound hospital ship. In early afternoon sighted two ships northbound with two escorts. Fired six torpedoes at 1922 L., near 1°-06' N., 145°-14' E. Heard two timed hits, saw one ship spinning radically. Escorts promptly counter-attacked with eleven depth charges, no damage. Searched for convoy 9th but forced to abandon search low in fuel. Ordered to TULAGI arriving 13th. Refueled and loaded four torpedoes transferred from BALAO. Seized again for patrol area 14th, SJ radar operation unsuccessful. On 16th picked up Jap soldier adrift on raft near 1°-47' South, 153°-15' East. 17th - 19th patrolling BILIBU MUSSAU traffic lanes. On 20 December sighted convoy one mru freighter, one large freighter-tanker (stack art) with two escorts southbound. Obtained position ahead and at 1731 fired six torpedo spread to cover both targets overlapping in line of bearing. Saw near target, smaller freighter, disintegrate. Heard two timed hits on larger mru. Heavily depth charged by efficient escorts, with considerable minor damage. Surfaced after dark and closed scene. Met the escorts at short range in poor visibility,

— page 233 —
6. Referring to the Commanding Officer's remarks under 0415 entry 29 November on page 4, every effort is being made continuously to improve communications. The advantage of using ship shore circuit and the rebroadcasting of contacts, rests in not requiring other submarines to receipt for the contacts and in insuring that transmitting ship knows that all others concerned have received it. Only in rare instances has delay been excessive and of these only a small percentage have affected the tactical situation as was done in this case.

7. Referring to the Commanding Officer's entry under 1208, 29 December on page 24, the grey paint camouflage for vertical surfaces recently adopted, admittedly does not fit all conditions. At periscope depth in a smooth tropical sea there is little difference between black and grey on vertical surfaces. In a choppy sea under these circumstances the grey is preferable to black. For night surface attacks there is no doubt that the grey is preferable to black. Considering that no camouflage can be best for all conditions, this command considers that the change of vertical surfaces from black to grey has definitely improved the general effectiveness of submarines in this area of operations.

8. This is designated as a successful patrol for purposes of award of the Submarine Combat insignia.

9. The Commander Task Force SEVENTY-TWO congratulates the Commanding Officer, Officers and crew on this outstanding long patrol and the successful accomplishment of a special mission. The GATO is credited with inflicting the following damage on the enemy:

SUNK

1 freighter-transport 5,600 tons
1 freighter-tanker, unidentified . 9,000 tons
1 freighter, unidentified 6,500 tons
TOTAL 21,100 tons

- 4 -

— page 235 —
1/2 copy

S3212/A16-3
DECLASSIFIED

U.S.S. GATO
c/o Fleet Post Office,
San Francisco, Calif.,
1 April 1944.

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

Via: The Commander's Marine Division HIGHWAY-T-70.
The Commander's Marine Squadron HIGHWAY.
The Commander's Marine Force, Pacific Fleet.
The Commander-in-Chief, Pacific Fleet.

Subject: U.S.S. GATO - Report of Patrol Number
EIGHT.

Enclosure: (A) Subject Report.

1. Enclosure (A) covering the eighth war patrol of U.S.S. GATO, in the Bismarck - New Guinea - Truk Area, is submitted herewith.

R.J. ROBY.

DECLASSIFIED
BY: OP-ORCE
DATE: 5/24/44

71203 FILMED

— page 236 —
1944. U.S.S. GATO - Report of EIGHTH WAR PATROL

(a) PROLOGUE
GATO arrived NEAR NAVY GUNNEA on January 10, 1944, completing her 7th War Patrol. The normal two weeks' refit was performed by the U.S.S. GATO and Subdiv 81 relief crew. Receiving static sound test as well as a deep running close test. An excellent two day training period was provided. U.S.S. GATO, H.M.A.S. STRILL, and PT Boats participated for a short time, two

(b) NARRATIVE
February 2, 1944. (All times Zone Minus Elavec)
0700 Underway from NINE BAY, Territory of NEV GUNNEA, escorted by U.S.S. PO 1121. Made trim dive, and exercised in clearing bridge.

February 3, 1944.
1220 Off DREGER HARBOR, NEV GUNNEA, made rendezvous with PT boats #196 and 323. Relaase PO 1121, transferred BOM to U.S.S. PORTUALS, and proceeded toward VITLAZ STR.IT, escorted by the two PT boats.

1900 On completing surface transit of VITLAZ STR.IT without incident, released escorts and proceeded on special mission. (This mission is reported separately because of its classification.)

February 5, 1944.
Special mission completed. Proceeding to guard VITLAZ STR.IT, enroute DREGER HARBOR, T.N.G. Submerged during daylight.

February 7, 1944.
Enroute DREGER HARBOR, T.N.G. 0626 Mat PT boats #192 and 325 at NORTH end of VITLAZ STR.IT and proceeded under their escort.

INCLOSURE (A) - 1 -

— page 237 —
1350
Entered DRUGG AND MARINE and mooring chinese
fashion to starboard side of U.S.S. FORTUNA.
Disembarked passengers and commenced fuelling.
A single bomb was dropped by plane (delivered
enemy), landing on beach distant 90C yds.,
from CTO. Local pursuit planes commenced
performing.
Fulfillment completed.
Underway from alongside U.S.S. FORTUNA.
Enroute operating area, escorted by two
FT boats.

February 6, 1944.

: 0305
Enroute patrol area.
Reloassd escort at FORTUNA and VITIAZ SMITH.
Sighted undoubtful aircraft bearing
000(T), distant 3 miles, altitude 3000 ft.,
course SCUTTLE. Load quick dive and hold
various drills.
Surfaced and continued.

: 0940
February 9, 1944.

: 1215
Patrolling NORTH OF KITTY ISLANDS in vicinity
of equator. During foronoon made dive
for trim, test and training.

: 1215
February 10, 1944.

: 1215
Patrolling assigned station.
Sighted undoubtful plane bearing 085(T),
distant about 6 miles, course 06C(T),
altitude 10,000 ft. Possibly LIBRATOR.
CANO submerged for 90 minutes, using this
opportunity for drills.

: 1215
February 11, 1944.

: 1215
Patroling the KAVIERS - TILES route.

EXPLOSURE (A) - 2 -

— page 238 —
0745. 1ad0 one hour div0 for trin and training.

February 12, 1944.

Proceeding from TRUK - 1RI route. Had a two-hour div0 for trin and training.

February 13, 1944.

Patrolling from TRUK - 1RI route. Submerged for trin and training. Surfaced and set course for now station on scouting line SOUTH of TRUK.

February 14, 1944.

On scouting line: SOUTH of TRUK. Received contact report from search plane, four LARUS, one CL and one DD, in our area. Set course to in, report, using all engines. Received contact to above contact report, changing the outboard course by 35 degrees and the speed by 5 knots. Had to assume that message correct. Ran to a point dead ahead of him. The observed reverse of his course.

1630 No contact on the 1g a point the convoy would have reached a slow speed if the course estimate had been correct. Changed to TRUK courses as for the 1g covering many assumed courses and speeds as possible before dark. Then set a rotating search to SOUTHWEST of the convoy.

February 15, 1944.

Running retiring search for reported convoy of four LARUS and three escorts. By 0300 had covered such a variety of SOUTHWEST courses and speeds that the C.O., now

ENCLOSURE (A) - 3 -

— page 240 —
1545
At a distance of 94 miles from this torpedo attack was driven down by a twin 5-inch bomb, believed to be a 5-inch bomb, believed to

— page 241 —
2318
Subject: U.S.S. GATO - Report of HIGH WAR PATROL
February 18, 1944 (Cont.)

high periscope watch.
No contacts.
Received instructions to leave here tomorrow at dusk or SOUTH EAST, TRUK.

Patrolling USS of PLYMOUTH ISLAND to intercept a fishing escaping TRUK.
No information received as to results of U.S. attack on TRUK.
No contacts.
At dusk set course for UK.

: 0640
Proceeding to new station at SOUTH, entrance of TRUK.
Still have no report on whether or not our forces hit the place yesterday or day before, as schedule.
Passed thru a large patch of oil 20 miles SOUTH of SOUTH EAST. Took as an indication that some large vessel was sunk here very recently.
Submerged at daylight fifteen miles from SOUTH EAST, and continued toward the entrance.
Hoard echo ranging in direction of SOUTH EAST. Very soon the following stock out.
1 Hoavy cruiser, 1 Tender (Aircraft carrier), 1 Light cruiser, 1 very small AO or AOG, 3 DD, 2 small escorts (PC type).
The initial range was about 10 miles, angle on bow 1 starboard. ATO commenced approach at 1 hour to battle stations.
Hoavy, immediately on clearing the roof the target, the good course sharply to the WEST and good off at an estimated 17 knots.
Hover got. within range. (Minimum torpedo run 5,000 while angle on bow 130).
Extends SD Radar antenna for transmitting (we wore now about 25 miles from OLAH ISLAND which is well to the up). Checked

: 0930
INCLUSURE (A)

— page 242 —
1957

SUBJECT: U.S. CADO - 1st sort of SIGHT YAR PATROL

February 20, 1944 (cont.)

0931
Frequency.
Command transmitting contact report on aircraft frequency using aircraft code and calls. After second call up somonos one-word thru the 5th is so wo transmitted tho report. Record - acknowledgment but JAP station was at it, in so wo lot it go at that.

1235
A small patrol boat stood along tho roof passing between CADO and OLLAN ISLAND. Wo wore two milos off tho roof at tho time. Estimate tho patrol boat was about 500 yards off tho roof. Sho did not echo range. Had extremely high masts, without crows nests, single thin high mast, small guns foro and aft. Hado brown smolos. Maybe 150 tons.

2000
Surface and stood down traffic route toward HULSH. PLANM led to retransmit our contact report if no aclm.wlogament came.

2030
Received contact report showing that all-though our transmission at O93J was not received, tho same enemy force was reported by a patrol plane at 1450 today. Therefore we will not re-rammit. Slowed and stored as it was too cover this traffic line and to be two milos or SOUTH PASS at daylight.

February 21, 1944.

0635
Patrolling off SOUTH PASS, TRUK ISLANDS. Submerged and patrolled lino four milos SOUTH of tho SOUTHERN roof of TRUK ATOLL. No contacts.

1957
Surface and made swoop across tho "SISTER" approaches to it.

February 22, 1944.

Patrolling off SOUTH PASS, TRUK. Submerged during daylight.

SHOLOSURE (A) - 7 -

— page 243 —
1550
Sighted peculiar vessel proceeding WESTWARD along near OLD LAKE ISLAND. Commenced approach. It was two-masted, with bridge abaft mainmast, tenancy about 5,000. Top masts white, midsection of masts gray, bottom black or no. 1. Hull dirty black. On storm deck. Gun crew circular platform painted white, with dim. 2. Greater than boom of ship. Nothing but a single mounted gun in middle of platform (Not over three inch). His speed plotted 10 knots. Report was. could approach was 4,000 yards, at which rate. Crew fired 3 forward torpedoes. All heard running normal. Altho tracks were abaft vessels beam, he turned toward, either to counter attack or because troops diverted turn away.

1634
1635
1636
1651
2000
2152

Proceeded 300. WEST toward new station. Received instructions to stand by in case the aviators photographing LUKFORD ISLAND today should not assistance. (This is 330 miles from our present position and on the reverse of our course to now area. Reversed course and set to EASTWARD on 3 engines. Directed to proceed. Action near HOLLANDIA. Reversed course again.

PROCEDURE (A) - 8 -

— page 244 —
1201
Proceeding toward station of HOLLANDIA, using periscope on surface. To contacts.

: 1314
Proceeding on torpedo boat, 1201. Proceeding on torpedo boat, 1314.

: 1420
Ratailing on the PELEUS - HOLLANDIA route. Submerged at daylit. Sighood amicab to ang 235(T). Camo to normal was in the, it was evident that we were in a rough position, too distant to surface. Opened out on reverse of course, torpedo boat, 1420. Surface amicab commenced around 1400, 1432. Submerged amicab to 1432. Submerged amicab

— page 246 —
2240 The radical actions of the escorts had kept us from clearing the scano. Hoan-tino, of course, the remains of the convoy was heading for port. So at this time, when both escorts wore on the same general bearing we surfaced heading in the other. It was pitch black. All clear. 2250 Commenced reloading tubes, charging batteries, and heading toward HOLIMADIA (Six thirsty disoles consuming our small stock of fuel).

February 27, 1944.

: 0719 Proceeding toward HOLIMADIA to intercept convoy. 1015 By warped on a sub-escorted approach. 1157 The large ship was headed for the convoy. The convoy was heading for the

— page 247 —
1240
1241
1247
1351
1402
2030
1740
1815

SUBJECT: U.S.S. CA-1 - Report of EIGHT WAR PATROL

February 27, 1944 (Cont.)

watchcod. The target so was stop od (but wore
hood to start up ton' nuts later).
Startod deay.
Two depth bombs (in close).
Target scraws sta'rod up and work up to
exactly tho rpm so had been raking bo-
fore tho attack.
Fast screws passad down our port side
(from North to South).
Nado norisoyc'observat'ion. Nothing in sight.
Scoured from battlo stations. Remained sub-
morgod off HOLLANDIA until dark. No contacts.
Surfaced. Transmitted GATO 27094 reporting
fuel and torpedoes on hard, results of
attacks, and intention to maintain station
for several more days (despite fuel short-
age).

February 28, 1944.

Patroling of NEW GUINEA coast. No contacts.
Locov'c instruction to leave station at
dusk 1-4-41, for LAU-NAK BAY for emergency
fuel.

February 29, 1944.

Patroling of NEW GUINEA coast, in vicinity
of MAIDU ISLAND.
Sighted small vessel moving toward us
paralleling the coast. She was about a 300
ton, motel, steamer and had a 3C foot
boom rigged out to port. On close approach
it was noted that the towing something
underwater by a 1-4-41. She was numbered
241. Fainted dark gray. No other angling was
heard.
Target came abreast GATO distant about 500
yards than turned toward us. GATO had been
running silent for some time. At this time
planned down to 200-foot.

ENCLOSURE (A) - 12 -

— page 248 —
1906
Seacord from silent running as noting further was heard from the boat.
2030
Surface and commando patrolling close to the coastline Northwest of MADE ISLAND. Could find no evidence of Radar in the vicinity.

March 1, 1944.

0716
Patrolling near MADE ISLAND, LT. CUTTER.
Submerged to reconnoiter the above named
Kato. Found no visible Radar antennas.
No surface vessels visible. Any planes
were landing and taking off during the
day. They were light or medium bombers,
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