U.S.S. GATO (SS-212) — war patrol report SS-212_GATO_Part2.pdf

— page 1 —
1547
Examine the target at about 2000 yds. It can't be zero clear 100 tons. Raising it on bow. Two rads' antennas. Cho stack. Ho is shing gear on it. Japs no blasts. Letting anddships. Cho in l. hit 6-4hr. guess in sight. Surracoal to destroy it with gunfire. Roascning: - (a) 30mny - ines, radios, ecavoy- noes an personnel, ovan in small ubs should be de- etroyed with protection. (b) 5 have tho time and are w.ll clear of enemy air base. (c) ivan it' go to a contact report f, an anti sub hunt in it' - quality will be

: 1452
Accordingly, close. fire. His crew at 10:00. at first must. The vessel was making about 14 kcs and hor engines continued to run at full spood. Only oxponded enough ammunition to remove pilot house, disab' antennas, stop engines and start a small s. o. s. to caurse to clear area. It a range of about 35 miles, smoke of target was still visible. GND continued around the shoal of JANU ISLAND arcuate now traffic lano in foolwink Bay.

: 1745
March 10, 1944.

: 0830
Patrolling approaches to Cankwari f. m Southcoast. It darl'ht teck up station for surface patrol stwon HONORER ISLAND and tho shoal to its Southwar. Traffic from both ISLAND and POI should pass here well within sight. Anything on the shoal would also be in sight.

: 16
INCLOSURE (A)

— page 3 —
10, 1944 (Cont.)

Accordingly GATO set course for the coast to intercept. The only hope was to reach a position ahead and dive. Target appeared over the horizon closing GATO and Kamikwari. We were closing her track but could not reach it on surface. Submerged as bridge of target came over horizon. Closed coast at best spot for 15 minutes. Found that we were losing cut. Corr. mud on course hoping for any change of course, loss of speed or other lucky move on the part of target. Target passed well to strike firing ran. We were now too close to Imokwari to catch her by surface. Stood out from coast. Surfaced 1' nils SZ of Nanokwari and set course to clear Goolivink Bay. Observed 2' high power AA searchlights in and around the harbor. They waved and concentrated. To plunder observed in the boats. Searchlight did lay continued sporadically until 2400.

March 11, 1944.

Patroling North Coast of DUTCH AI GUINEA, between Cayo of Good Hope and Nanokwari. Submerged at depth 2 miles off TASOGO SAOKRIS, having selected this as a spot where we can use the coast just as well as the enemy. This point is a nihts run from Nanokwari for the convoy r.p. merchantman, and on the logical route to Halmokora. Conducted submarine patrol about 2 miles from coast where we can see a vessel round either of the caps. No contacts. Surfaced and hauled cut from coast 2 miles to charge batteries.

0830

ENCLOSURE (A)

— page 6 —
1026
Seacord guns, as there was no question of total destruction. Target now burning 100%. It is noteworthy that the cargo space burned more violently than any other, suggesting that gasoline or other inflammable cargo was last carried.
1030 Set course for another part of our area (Geolvink Bay) using four engines.
1115 Heavy explosion commenced on target. KIVO crew being permitted to observe thru portscope. Possibly a dozen explosions occurred. The stock was heavy and black until 11:30 on it ended in white smoke or steam. Could not observe target sink as she was (war the horizon by this time).
1155 Sighted three small planes in V formation, 290. They were following the coast and were indicating of sighting KIVO.
1047 Surface and headed for Geolvink Bay.

March 13, 1944.

: 0959
Tactliling: I amokwari, on surface.
Sighted and plane bearing 210°(T) distant 1/2 miles. It appeared to take off from TORPOR ISLAND which may be a lighthouse a lighthouse airport or strip.
1216 Surface: cover more possible lanes.
1224 Sighted masts on horizon bearing 120°(T). Commenced tracking.
1303 Submerged chart of target.
1330 Target came into view. Sound ran had prepared us for a "spit-kit" but not quite for the disportables wreck that we now saw. It was a broken down trawler used for carrying cement and stoves for construction purposes. (It is ray be further indication of dof-ase on NORTHERN ISL.)

- 21 -

ENCLOSURE (L):

- 21 -

— page 8 —
2050
Dark. Surfaces. How that we have dis-
closed ourselves at the t'ree main points
in our area, we shall stay the cycle
all over. Set course for Cape Kamori.

March 16, 1944.
Patrolling off Cape Kamori on North-
western ap. each to Kanokwari. Submerged
during dayl it. No contacts.

March 17, 1944.
Surfaced. Decarted Geelvink Bay, close to
shore south of Kanokwari. No contacts.
Submerged through daylight.
Surfaced. Decarted Geelvink Bay.

March 18, 1944.
Enroute to Crossing the Halmahera,
Hollandia line.

March 19, 1944.
Enroute to IDWAY. Crossing the Poles -
Now Guinea line.
Radar indicated another radar bearing
080°(T). This was thought to be one of
the friendly submarines which are ox-
pocketed to pass thru our area. The
I.P.T. did not register a friendly ship
however. Spont 1 hour an 15 minutes
manouvring to avoid, bec use we both
tried to pass each other to North, then
both reversed at same time.

- 23 -

ENCLOSURE (1)

— page 9 —
1. DENTITAL
: 2. JocT: U.S.S. GATO - Report of EIGHTH WAR PATROL
: March 20, 1944.

Approaching and passing thru CAROLINE ISLANDS, on route to PATROL.
0650 Sighted ITALIAN Island bearing 030°(T), made and around to port.
0934 Sighted unidentified aircraft bearing 150°(T), course 63°(T). Made quick dive.
1045 Surfaced. All clear. Resumed journey.
1500 Sighted at last plane bearing 235°(T), distant 10 miles, loading toward CAPT. Made quick dive.
1507 First day's bomb, large, but not dangerously close.
1508 Second and last depth be, same size and distance.
1621 All clear on SD radar. Surfaced to clear area.
1644 Plate plane, probably same one sighted at 1500, approached from be, ding 080°(T), distant about 10 miles. Chalked quick dive.
1645 GATO bottomed on unc. shallow spot. (throo minutes aft. water, but no bottom and not deep.)
1744 This plane must have only been dropped. G.T.C. wasted no time in obtaining a sight. negative buoyancy and backing clear (Liout. J.T. Gilman, USNR, landing the trim very nicely). After storing the plane for our original course for three hours a half hour without finding any deeper water, decided we must be just holding our own against a current. Felt that this was a poor place to be caught when the plane brought surface or air reinforcements. (Two men,). Flare I ad gono. Got course north to open distance from OLYMPIA Island.
1744 Note: S'see our positions were known with extreme accuracy, and verified by subsequent flights, the above incident shows.

- 24 -

SINGLOSE (1.)

— page 10 —
2000
March 20, 1944 (Cont.)

that Tarang bank is either ore extensive (by 35 miles) than shown, or else a new bank has been located (See note par. 1941).
Darl. Set great circle course for Midway Island.

: 1939
March 21, 1944.
First Carolline Islands, on route Midway.
Sighted unidentified plane bearing 205°(T), distant about 5 miles. Made quick dive.
Surface, all clear.

: 1045
March 22, 1944.
North of Carolline Islands, on route Midway.
Sighted aircraft bearing 120°(T), fast 7 miles, course 300°(T).
CIRC sub-argoed.
Surface, all clear.

: 1053
March 23, (Last Longitude Date)1944.
To
March 27, (West Longitude Date)1944.
Proceeding to Midway on surface.

: 1400(+12)
March 28, 1944.
0330(+12) Arrived Midway Island. In exchange for nine torpedoes received 35, 00 gallons of fuel, and a generous holpin of fuel oil, apples, oranges, celery, lettuce, yard and band.
1400(+12) Deported under air escort.

- 25 -

SHOULDER (A)

— page 11 —
1944, 31, 1844.
Enroute Pearl on surface.
Arrived Pearl Harbor, T.H., for rest.

Note: Page 27 is blank.

- 20 -

EXPLOSURE (A)

— page 12 —
1. From a military standpoint it is important to
   - Propose two sudden remiguallies
   - An alert submarine can use
   - Or shift position rapidly on the surface, but on must
   - Also realize that the visibility increases just as rapidly
   - As it decreases.

2. The Aerologists may want to know that the
   - Weather front predicted vast of TUK on 22 February did
   - Not appear. No watch for it.

(D) TIDAL INFORMATION:
   - Some of the currents mentioned in par. "E" may
   - Be tidal.

(E) NAVIGATIONAL AIDS AND HIDDRA CFS:
1. RADAR R.I.C.E.:
   - It ray be helpful to navi. tore to toll of the
   - Scaro thrown into GLO to navigate. It is
   - Put her 52 miles from the
   - And the Radar. The radar is
   - It is that the Radar was on
   - Off and was picking up
   - 000 yards b.lng the full
   - Yards road by the operator.

2. OPEN BAY:
   - The regular charts suffice for an app. each to
   - CRIT. DAY and the West Coast of the
   - TENTHILL. The best landmarks are the two
   - Volcanic peaks and the island on the south
   - Side of the bay.

- 28 -

ENCLOSURE (A)

— page 13 —
29 -

**Subj:**
U.S.S. C.A.T.O. - Report of EIGHTH WAR PATROL

(E) INVIGATIONAL AIDS AND HURCHES (Cont.)

OPEN BAY (Cont.)
All of those crew 1 mile to the eastward of their charted position as noted in German Surveys.

3. INTAKE KANINE (CHORAC)
Unprotected by a roof, this anchorage affords exfoliating landing facilities with light surf, a hard beach, and 9 fathoms to within 1,000 yards of the beach.

4. DREGSER HARBOR - CAPE GREY.
Approaching DREGSER HARBOR the 1st prominent landmarks from the southward is PORTIFICATION FLIT. From the north HUSSING ISLAND looks like, and hides, the tangent of CAPE GREY.

5. VI. Z SHR. IT.
Five passages thru that strait between LOG and OK. LIDDS go to a Southly current of one boat.

6. PUSHU ISLAND.
This island is low, with no distinguishing marks. It can be looked up on the surface by periscope at 1,000 yards. 5 knot south easterly was experience for 3 days around it and L.D.Y. LIGHT B.K.

7. TRUK, SOUTH 33.
TOL ISLAND peak is the best landmark approaching from the south or west.

- 29 -

— page 14 —
30 - 50

---

**Subj:**
U.S.S. CLUB - Report of HIGH WAR PATROL

(2) VIC. HIGH WAR PATROL (Cont.)

TRUK, SOUTH F.J.S. (Cont.)

CLUB: ISLID, on the southern roof is visible from a distance of 8 miles a group of submarines. Jap aircraft and gunners are clearly coming out of the south. The high roof of the submarine is very little current, and the water is very calm. The surface of the water is calm

— page 15 —
12. NORTH COAST PATROL

A steady, steady (1 to 2 knots) was experienced from the coast in a direction along the coast. It was probably tidal as it reversed twice during the day.

13. UNCHARTED BANK - OLDER ISLANDS.

An uncharted bank - a least depth 14 fathoms exists 30 miles due north of ALPIT ISLAND (CULIAR GROUP), extending over miles in a north-south direction. Its extent East and West of those points is unknown; there being no opportunity to take further soundings due to the presence of enemy plane at the time. CATO discovered its presence by bottoming on it. The bank rises steeply from depth of 500 fathoms to 22 fathoms in 5 miles.

The above position was determined from a land fix 11 hours' previous to discovery, a latitude 1m. 7 hours, and a longitude 2m 2 minutes before; combined with a verification by 4 star, fix 3 hours after its discovery.

- 31

[END OF DOCUMENT]

— page 17 —
1. Tino(L): Lat. : : Init.:Coup.: : How : : No.: Dato : Long.: Typo(s): Rangers: : Alt : Cont: Ranges :

— page 18 —
1. ATTACK DATA

U.S.S. GATO
TORRICO ATTACK 10.1
PATROL NO. 8

Timo 1625(L) Date 2-22-41 Lat. 0-04.58 Long. 130-44
Target Date - Damage Inflicted

Description 5,000 ton two-mast oil vessel with bridge abaft mainmast.

Ship(s) Sunk: Iron.

Ship(s) Damaged
Probably Sunk: None.

Ago Dotor-Lad by

Target Draft 121 Course 270° Jpood 10 Rang 3,900

Own Ship Data

Wood 2.5 Course 204° Depth 63° Angle 0°

Fire Control and Torpedo Data

Type Attack
Daylight porisco approach with Mk III
Kod 1 TDC, angle rotors in automatic.
Spoed spread used.

| Type | Attack | Depth | Angle | Torpedo |
|------||-------|-------||
|      |        |       |       |        |
| Abos | Firod  | #1    | #3    | #4     |
| Track | Angle | 133 P | 135 P | 137 P  |
| Gyro | Angle | 001   | 359   | 357    |
| Depth | Sot   | 6'    | 6'    | 6'     |
| Power |        | High | High | High   |

ENCLOSURE (A)

— page 20 —
FIDENITAL
Subject:  U.S.S. GATO - Report of EIGHTH WAR PAROL

(H) ATTACK DATA (Cont.)

U.S.S. GATO TORPEDO ATTACK NO. 2 PATROL NO. 8

Time 2031(L) Date 2-26-44 Lat. 0-555 Long. 139-02E

Target Data - Damage Inflicted

Description
Four LARUS escorted by two 30's in a diamond formation.

(a) Sunk
One 8,500 ton and 500 ton merchantman.

(b) Damaged
Probably Sunk Hono.

Damage Deterimined
Saw one hit and heard anchor hit in large LARU. Sound tracked, torpedo to second target. Than heard one hit in this target and breaking up noises from both ships. Also, convoy sighted next day with those two ships missing.

Target draft 25' Course 142° & 122° Spoed 8.6 Range 1800

Own Ship Data
Speed 7 Course 222° Depth 64' Angle 0°

Fire Control and Torpedo Data
Type Attack Daylight periscope approach with Mk III Mod 1 TDC, angle 8°s before in automatic. Speed spread used.

Tubes Fired
#1 #2 #3 #4 #5 #6

Cargo Angle 60° P 62° P 64° P 63° P 46° S

ENCLOSURE (A)

— page 21 —
1
CONFIDENTIAL
Subject: U.S.S. GATO - Report of EIGHTH WAR PATROL

(H) ATTACK DATA (Cont.)

| Torpedo Attack No. 2 (Cont.) | Gyro Angle | Depth Set | Power | Hit or Miss | Erratic | Mark Torpedo | Serial No. | Mark Exploder | Serial No. | Actuation Set | Actuation Actual | Mark Warhead | Serial No. | Explosive | Firing Interval | Type Spread | Sea Conditions | Overhaul Activity | Remarks: | ENCLOSURE (A) |
||||-------|

— page 22 —
U.S.S. C.V. 3 - Report of 3 HIGHWAY WAR PATROL

(H) ATTACK DATA (Cont.)

U.S.S. GATO TORPEDO ATTACK NO. 3 FLTROL NO. 8

Time 1235(L) Date 2-27-44 Lat. 1-123 Long. 134-22W

Target Data - Damage inflicted

Ship's name: Small ship from convoy as in attack No. 2.

Ship's type: Hornet.

Damage: Probably sunk 4,500 ton merchantman damaged.

Damage location: Board peculiar explosion at proper time and saw target take a 15° list.

Target Draft 231 Course 095° Spood 9 Range 1,500

Own Ship Data

Spood 2 Course 240° Depth 631° angle 0°

Fire Control and Torpedo Data

Type Attack Day 1st periscope attack with Mk III Iod 1 DC, angle soothers in automatic. Spood spread used.

Tubes Fired #7 #8 #9 #10

Track Angle 140 S 145 S 160 S 165 S

Gyro Angle 153 160 173 180

Depth 15' 15' 1' 15'

ENCLOSURE (A)

— page 23 —
35

BIBLIOGRAPHY:
1. Subj: U.S.S. GATO - Report of EIGHTH MAR PATROL
2. (H) ATTACK DATA (Cont.)
3. Torpedo Attack No. 3 (Cont.)
4. Power: High, High, High, High
5. Hit or Miss: Hit, Hit, Hit, Hit
6. Erratic: No, No, No, No
7. Mark Torpedo: 14-3A, 14-3A, 14-3A, 14-3A
8. Serial No.: 39935, 32457, 39803, 39296
9. Mark Exploder: 6-4, 6-4, 6-4, 6-4
10. Serial No.: 14532, 7867, 8117, 9493
11. Actuation Set: Contact, Contact, Contact, Contact
12. Actuation Actual: 16, 16, 16, 16
13. Mark Warhead: 838, 9896, 712, 2646
14. Explosive: TX, TX, TX, TX
15. Firing Interval: 0, 7 sec., 7 sec., 9 sec., 9 sec.
16. Type Spread: 12.1, 9.9, 7.7, 5.5
17. Sea Conditions: Calm, Calm, Calm, Calm
18. Corroboration: FULCT, FULCT, FULCT, FULCT
19. Remarks: Vessels screws wore hard to start up while GATO was evading air attack (screws had stopped when FULCT was hit).

- 35
- BIBLIOGRAPHY (A)

— page 24 —
1. U.S.S. GATO - Report: 2. 35th WAR PATROL: 3. ATTACK DATA (Cont): 4. U.S. GATO: 5. GUN ATTACK NO 1: 6. PATROL NO. 8: 7. 0800 (L) Date 2-15-44: 8. Lat. 04-001: 9. Long. 150-10E: 10. Target Data - Damage Inflicted: 11. Sunk: 12. None. 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— page 25 —
1. USS S. GATO (H) ATTACK DATA (Cont.)
U.S.S. GATO GUN ATTACK NO. 2 FATEH NO. 8
Time 1452(L) Date 3-9-24 Lat. 0-20S Long. 135-23E
Target Data - Damage Inflicted
Sunk None.
Damaged or
Probably Sunk
Japanese fishing vessel of net nero than 100 tons. Had Rising Sun on each bow, two radio antimano, no guns or fighting gear in sight.
Damage Deter-
mined by
Close gun fire started at all fire which spread throughout the vessel, two hours later at a range of about 35 miles, smoke was still visible.
Details of action
Surface with target ahead, heading away at about 4,000 yards. At this fire until range was joint blank (200 to 500 yards). Died 300 rounds 20 min., 500 rounds 50 cal., and 5 rounds 5 inch common. The machine guns cleared the upper works and started fires. The 3" shells wore placed near the waterline and in onginoring space.

- 41 -

SHERLOCKS (A)

— page 30 —
1. U.S.S. GATO - Report of SIGHT WAR PATROL

(1) TORPEDOES
Torpedoes
Number
11

Fuels
Gals.
4,000

Provisions
Days
10

Personnel Factor
Days
21

(**) REMARKS.
None.

HOLOSURE (A)

— page 33 —
5-8/AL6-3
COMMANDER SUBMARINE SQUADRON EIGHT

Serial 031

SECOND ENDORSEMENT to
'06, USS GATO report
of 8th War Patrol.

CONFIDENTIAL

From:
To:
Via:

Subject:

1. Forwarded, concurring in the remarks of Commander Submarine Division EIGHTY-TWO.

2. GATO will be refitted by FULTON in the normal refit period.

3. The Commander Submarine Squadron EIGHT congratulates the Commanding Officer, COL. S. S. SQUADRON EIGHT, on the completion of another aggressive and suceeful patrol.

[Signature]
[SEAL]
Acting.

— page 34 —
5 0259
FF12-10/A16-3(15)/(16)
Serial 0707
CONTINUED TO
CIRCUITRY TO
SUBJECT: 13 April 1944.
CONTRABAND PATROL REPORT NO. 402
U.S.S. GATO - EIGHTH WAR PATROL.
From: The Commander Submarine Force, Pacific Fleet.
To: The Commander-in-Chief, United States Fleet.
Via: The Commander-in-Chief, U. S. Pacific Fleet.
Subject: U.S.S. GATO (15212) - Report of Eighth War Patrol.
(2 February to 1 April 1944).

1. The GATO's eighth war patrol was spent in the Bismarck-New Guinea-Truk Area and enroute Pearl Harbor.

2. This patrol covered large areas where possible enemy shipping might be encountered and was outstanding in aggression, well equipped for torpedo and gun attacks which resulted in the destruction of enemy shipping.

3. In addition to the primary mission of sinking enemy ships, the GATO carried out a special mission successfully, and also performed a regular patrol during South of Truk.

4. The gun attacks by the GATO against enemy trawlers and on an armed merchant vessel were carried out only after a careful estimate of the situation had been made and when the GATO was assured that the strategic advantage was hers.

5. This and many other recent patrols tend to show that our lookouts must become more and more adept in their sighting of enemy aircraft. To much confidence should not be placed upon the ship's radar for plane detection.

6. Anti-submarine measures encountered by the GATO during the patrol indicate that the Japanese are evidently using a form of Sonar-bomb to endeavor to locate the submarine.

7. This patrol is designated as successful for Combat Insignia Award.

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

FILMED

— page 35 —
11/12/44-2(25-6) 6) 1
Serial 2007
CONTINUED
NOTE: THIS REPORT WILL BE
DISTRUBED PRIOR TO
ENTERING PATROL AREA.

W/ 4.5 TONS REPORT NO. 402
(2 December 1944)

SUBJECT: 4.5 TONS (Attack No. 2)
1. 8,500 tons (Attack No. 2)
2. 6,500 tons (Attack No. 2)
3. 2,000 tons (Gun Attack No. 3)*
4. 150 tons (Gun Attack No. 1)*
5. 100 tons (Gun Attack No. 2)*
6. 17,300 tons (Gun Attack No. 3)*

DAMAGE:
1. 4,500 tons (Attack No. 3)
2. 21,600 tons

W/ 4.5 TONS (Attack No. 2)
1. 8,500 tons (Attack No. 2)
2. 6,500 tons (Attack No. 2)
3. 2,000 tons (Gun Attack No. 3)*
4. 150 tons (Gun Attack No. 1)*
5. 100 tons (Gun Attack No. 2)*
6. 17,300 tons (Gun Attack No. 3)*

J. H. BROWN, Jr.

J. H. BROWN, Jr.
(5)
(5)
(6)
(6)
(1)
(1)
(2)

— page 36 —
22 June 1944

From: The Commanding Officer, U.S.S. GATO.
To: The Commander in Chief, United States Fleet.
Via: The Commander Submarine Division G-2 ZERO T/O.
The Commander Submarine Squadron T/O.
The Commander Submarine Force, Pacific Fleet.

Subject: U.S.S. GATO, Report of War Patrol Number Nine.

Enclosures: (A) Subject Report.
(B) Track Chart (for Consubapa only)

1. Enclosure (A) covering the ninth war patrol of this vessel conducted in area between latitudes 6° North to 12° North and between longitudes 143° East to 168° East, during the period 30 April to 22 June, 1944 is forwarded herewith.

[Signature]
[Name]
[Title]

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY OIC-ORB-CC DATE 5/12/42

DECLASSIFIED

— page 37 —
1-3 May, 1944
USS S-3, GATO
Report of Ninth War Patrol

CONFIDENTIAL

(A) PROLOGUE

Arrived Pearl Harbor, T.H. from Eighth War Patrol April 2, 1944 (reported from Soweaspa, Task Force 72), Submarine Division 62 in U.S.S. PULPIT commenced refit. Refit was completed by Submarine Base, Pearl upon departure of U.S.S. PULPIT for navy yard Mare Island on 16 April 1944. Conducted normal refit and accomplished the following: Installed P.P.I. spool and Leachman Rendezvous unit; converted 1/4 L.P.T. to F.U.F.T.; drydocked in Ard #8; installed auxiliary tow and Storm Plane and auxiliary rudder angle indicators; installed 4"-50 cal. gun; installed Tark III - Mod 5 torpedo data computer; installed centrifuga type trim pump. Completed sound test in West Lock; but was not deepened. April 20, 1944: Commander F.J. POLE, U.S.N., relieved as Commander Officer by Lieutenant Commander R.L. PARRELL, U.S.N. Held seven days training 21 April through 27 April, 1944. Fired four (4) Mk XIV and two (2) XWII torpedoes. Conducted Battle Surface and dock gun firing against towed target. Completed loading April 28th and 29th. Ready for sea April 30, 1944.

(B) NARRATIVE

30 April, 1944.
1520 (V-17) Vice Admiral C.A. LOCKWOOD, Jr., U.S.N., Consumpt, came aboard.
1330 (V-17) Deported Pearl Harbor, T.H. in company with U.S.S. HUSKALLUM, for Midway, T.H. with P.C. 1077 as escort. Commenced operations in accordance with Combatant-17 Secret Operation Order #149 of 29 April 1944, as Task Unit 17.2.1.
1600 (V-17) Nude trim dive.
1615 (V-17) Surfaced.
2000 (V-17) Relapsed escort, set course 350° 1/2 standard speed on two main engines. Parted company with U.S.S. HUSKALLUM.

1-3 May, 1944
Enroute Midway, T.H. at two (2) engine speed conducting daily trim dives and fire control drills. Sighted two (2) P.B.T. scout planes while enroute. Did not exchange recognition signals. (A.C. #1-2).

4 May, 1944.
0615 (X) Sighted U.S.S. HUSKALLUM, set course for 2 miles south Midway entrance.
0730 (X) Sighted and exchanged recognition signals with air escorts (two S.B.D's). (A.C. #3).
0735 (X) Sighted Midway T.H.
0815 (X) Picked up pilot and ordered Midway channel. Hooded alongside U.S.S. PAPER, 1100 in nest with U.S.S. PROTEUS at Submarine Port, Midway at 0655 (X).
0910 (X) Vice Admiral C.A. LOCKWOOD, Jr., U.S.N., left the ship.
1000 (X) Changed time to conform to +12 zoned time.

— page 40 —
22 May, 1944
1400
Took panoramic shots of islands. No shipping or patrol boats in lagoon and no aircraft sighted all day. What appears to be a small sampan type patrol boat was beached off Notegous Island. Several life boats were sighted on the beaches. No special sign of life noted when 1600 yards south of Raur channel entrance. Surfaced. Took station 10 miles west of Veloci and patrol boat on 10 mile logs north and south throught night.

23 May, 1944.
0500
Divided for submerged patrol off north edge of Veloci, concentrating on North Channel. Lighted first plane landing on Veloci. Low wing single engine land plane (might have been "Val" A.C. #10). Took panoramic shots of Veloci and adjacent islands from 1700 yards off North channel. The main island of Veloci appears to be considerably bomb-blasted. Shredded coconut tree tops, etc. Shore still appear to be no signs of much activity on this islands; and no indication of radar control stations as previously implied. Surfaced. Took station 10 miles west of Veloci and patrol boat on 10 mile logs north and south throughout night.

24 May, 1944.
0504
Divod. Patrol off Veloci (southern edge) through out day. Surfaced. Set course 033°T, for northwest corner of patrol area.

25 May, 1944.
0400
Radar contact on Parulop Island bearing 036°T., distant 22,450 yards. 0515 o/c to 053°T. S.D. contact at 2 miles; divided to avoid detection. Plane not sighted (A.C. #11). 0827 Surfaced. 1158 Sighted Carefut Island bearing 042°T., distant 11 miles. 1245 o/c to 042°T. 2008 o/c to 060°T.

26 May, 1944.
1400
Patrolling on surface. 1501 o/c to 180°T. Sighted plane bearing 045°T., distant 7 miles, course 010°T (approximately). Reported similar to P.Bill, search plane. Divod to avoid detection (A.C. #12). Surfaced.

27 May, 1944.
1556
Patrolling on surface, course 160°T.

— page 41 —
35212/A16-3
COPTD: TTL
U.S.S. GATO
Report of Ninth War Patrol.

(B) INSTRUCTIONS:
27 May, 1944.
1200 c/o to 330°T.
1410 Lade quick dive for training and routing torpedoes.
1712 Surfaced.

20 May, 1944.
0245 c/o to 113°T., increased speed to three (3) min engines
(16 knots).
1800 c/o to 090°T.
1900 c/o to 110°T.
2104 c/o to 047°T. and changed s/s to 11 knots on one main
engine, patrolling across Spain - Truk route.
2202 Radar contact bearing 345°T., distant 20,000 yards.
Put stern toward contact and commenced tracking, keeping
range about 17,000 yards. Radar finally showed four
large ships at this range plus an intermittent smaller ones;
which indicates four ships in the convoy plus an
unknown number of escorts. Tracking shows the convoy
on course 120°T., speed 8 knot pit. A small zig plan
was indicated, but could be due to yawing (about 10°-
15° either side of the base course) [Kosnot is at 2300,
so will hold off attack till after moon goes down.
2337 Battle stations - took station 5000 off track to port
and commenced approach, keeping zero angle on the bow
to the target group.

29 May, 1944.
0007 Range 7000 yards, angle on bow 55°P; made ready all
tubes. ...this range the convoy slowed up on radar
as follows: four (4) main ships of the convoy in a
loose column formation (one smashing heavily); five (5)
escorts - two on each flank patrolling back and forth
and one astrm patrolling from quarter to quarter. No
indication of radar. ...it range of 4500 yards the convoy
can now be made out through binoculars as follows:
Two leading ships in column 3000 - 4000 ton freighters;
third ship appears to be a medium engine aft freighter
(he is the smaller); and the fourth and last ship in
column a medium tanker. ...will take him as first target.
The escorts can not be definitely identified but they
appear to be P.C. or S.C. boats.
0011 14th range 4000 yards to target and near escort 2500
yards solution does not reach on T.D.C. (zig away
indicated) so at
0012 Right full rudder and pulled away from convoy in order
to make another attempt. Plan to come in for a 100°P.
track shot.
0016 Commenced tracking again 6000 yards on convoy's port
quarter in order to obtain a better idea what the
escorts are doing.
0025 P.P.I and plot show the storm escort patrolling at 10
knots on 50° zigs either side of the base course, while
while the

— page 42 —
29 May, 1944 (Cont.)
: the two flanking escorts on either side are patrolling back and forth and in-and-out from 1000 yards to 2000 yards of the convoy track. After working up to port beam at
: 0035 came right to 2200T., and headed in, range 5000 yards, speed 14 knots.
: 0042 With 4200 yards to 'target and 2200 yards to 'trailing port escort, 090 P. track and ready to fire, four or five small dim white lights appeared on the escort and he appeared to be swinging left toward us. Thinking we were sighted and range too great for firing, came right full rudder and put stern to escort. No opancd slowly but his lights still remained. At range of 6000 yards to escort, since he did not appear to be chasing us, decided to go astern of convoy and try for the starboard side. The background to port is getting light that is that to starboard as becoming darker. Continued tracking and working ahead on the starboard flank, distant 7000 yards.
: 0236 Came left to 0200T. and started in for attack. Adjust course to keep small angle on bow to target group.
: 0247 With range to target (fourth in column, which is tanker) 4000 yards, the rear flanking escort is directly in line with target. Escort again shoved several small white lights and started swinging toward, range 2500 yards. Right full rudder, a/a full. The range closed to 1800 yards then opancd slowly. Opancd range to 6000 yards and at
: 0251 came right and will attempt to come up on a 110° S. track (behind the starboard escorts). If this is not successful we'll end-around for a damn periscope attack. From light on trailing starboard escort. The two starboard escorts and the stern trailing escort turned toward, so at
: 0255 left full rudder, all chad full. Range to nearest escort 1500 yards.
: 0256 Made quick dive, rigged for depth charge attack and went to 350 foot.
: 0258-0300 Total of 10 to 12 charges dropped shallow and astern. However, they were close enough to break a few light bulbs aft. Put stern toward and spocded up when charges went off. From all indications they (the escorts), lot go when they reached the slick made by diving.
: 0345 With echo ranging far astern scoured from depth charge attack and came to periscope depth. Escorts still searching astern, but appear to have lost contact.
: 0435 5 distant depth charges.
: 0445 5 more distant depth charges.

— page 45 —
5 June, 1944

0155
0215
1300
2315

4 June, 1944

0155
0215
1300
2315

5 June, 1944

0605
0606
0702
0720
0721
0724
0725

1655
1812

6 June, 1944

1312
1313
1451

Retroillting on surface across Saipan - "Truk route, sighted unidentified aircraft bearing 300°T, distant 8 miles. (A.O., 20)."
Dived to avoid detection. (A.O., 20).
Surfaced on course 1800T.
Commenced patrolling, and 5... and 5... on 10 mile legs at 5/5 11 knots on one main engine.

Retrolling on surface across Saipan - "Truk route, sighted unidentified aircraft bearing 300°T, distant 8 miles. (A.O., 20)."
Dived to avoid detection. (A.O., 20).
Surfaced on course 1800T.
Commenced patrolling, and 5... and 5... on 10 mile legs at 5/5 11 knots on one main engine.

Retrolling on surface across Saipan - "Truk route, sighted unidentified aircraft bearing 300°T, distant 8 miles. (A.O., 20)."
Dived to avoid detection. (A.O., 20).
Surfaced on course 1800T.
Commenced patrolling, and 5... and 5... on 10 mile legs at 5/5 11 knots on one main engine.

-9-

— page 47 —
9 June, 1944.
Patrolling on surface.
0700 c/o to 000° T.
1253 Sighted plane hearing 000° T., distant 4 miles, passing between two cloud patches. (i.e., #27).
1254 Submerged, to avoid detection, Decided to remain submerged to routine torpedoes.
1614 Surface.

10 June, 1944.
Patrolling on surface.
0555 Sighted float biplane bearing 090° T., distant 5 miles.
0556 (i.e., #29).
0556 Sighted float biplane bearing 090° T., distant 5 miles, to avoid detection. As we are on Scipion - Trulk route decided to remain submerged in view of air cover, and possibility of intercepting traffic. For the past few days while patrolling this area just north of Hogarth and Greyfathor Banks this air cover has been quite extensive. This leads me to believe that Pulluwart Island is used for an air base for planes to meet traffic at Greyfathors or Iogani Bank and cover it on this last leg to Trulk on this Trulk - Scipion Route - especially when planes are sighted so early in the morning.

1511 Surface.
1538 Received C.T.N. 17 serial changing our area and duty.
1550 Ahead s/s 15 knots on two main engines, charging on other two.
1712 Sent C.N.O serial three to C.T. 17 amelovlading change.
2000 Head s/s 15.5 knots on four (2) main engines.
2232 Reduced speed to 14 knots on three (3) main engines because of seas.

11 June, 1944.
Annuity now area off Trulk.
0803 Sighted Tol Island, Trulk 10oll bearing 075° T., distant 52 miles.
1000 Attached assigned area. Conducting search for crew of B-24 reported down a work area.
1040 Sighted 2 planes (Hap's or Rufus) bearing 200° T., distant 5 miles coming out of clouds. (i.e., #29).
1041 Divod. Do not know whether we were detected.
1130 - 1330 Heard distant explosions at various intervals. Sounded like bomb explosions. We have had no information that Trulk was to be hit at this time.
1720 Surface. Combined search for downed aviators.
2130 Sighted searchlights and ... fire over Trulk. Searchlights, flares and, sporadic ... fire, continued over Trulk until 2300.

12 June, 1944.
Patrolling on station 36 miles from Trulk, bearing 325° T.

-LE-

— page 48 —
12 June, 1944.
(CONTINUED)

(B) NARRATIVE (Cont.)
12 June, 1944.
(CONTINUED)

0155  ...  fire over Trunk.
0244  Submerged and conducted patrol off Ota Pass;
1131  Sighted medium bomber (3ally) boarding 000T., distant 3 miles on course 180T. (...30, #30).
1155  Observed ... burst over Dublin Island, Trunk.
1220  Sighted single engine fighter boarding 020T., distant 2 miles (...30, #31). He headed toward us so went to 150 foot.
1240  Foriscope depth, all clear.
1620  Sighted stick buoy with rod flag, distant 1 mile. It could be fishing buoy or marker buoy.
1701  Hoard three distant explosions.
1859  Surfaced. Noted for center of assigned sector off Trunk.

13 June, 1944.
Patrolling on surface.
0455  Bivouac, Conducting submarine patrol.
1105  Surfaced to be on call for strike scheduled at 1150.
1120  Sighted unidentified plane boarding 220T., distant 15 miles. Put stern toward, apparently we were not sighted (...30, #32).

1151  Sighted medium bomber boarding 320T., distance 10 miles Plane was just off the water, elevation 5, and heading toward us. (...30, #33).
1152  Made Quick dive.
1342  Surfaced, air strike schooled for 1400-1600.
1547  Sighted Nam Island, bearing 080T., distant 15 miles.

14 June, 1944.
Patrolling on station in center of assigned sector.
0458  Divod, conducting submerged patrol.
1103  Surfaced, standing by for air strike schooled for 1150.
1125  Sighted ... bursts over Trunk and 3 bombers just above bursts.
1242  Sighted single engine fighter boarding 240T., distant 10 miles coming out of clouds. Put stern toward. (...30, #32). He appeared to be heading for us so at
1243  Made quick dive. Since strike is completed, decided to remain submerged to avoid detection.
1843  Surfaced.
2211  S.J. radar contact at 15,000 yards closing rapidly. 3wing left to put stern toward, but when range closed to 6,000 yards at (...30, #35).
2212  Made quick dive. Contact was plane headed in our direction.
2301  Surfaced. Continued patrolling on station.

-12-

— page 50 —
35212/16-3
CO: 1
U.S.S. GATO
Report of Ninth War Patrol.

(B) NARRATIVE (Cont.):

16 June, 1944. (Cont.).
2119 Received G.T.P. 17 serial directing us to depart area and I figured duties on the evening on the eighteenth.

17 June, 1944.
1108 Patroling in assigned sector east of Truk.
1235 Surfaced. Standing by for air strike schedule of for 1150.
1355 Received call from a plane over voice frequency
1345 requesting our position. We broadcast our position four times, but had no receipt or indication that we were
1355 had no instructions but for the sound
1355 in our sector south
1355 of the hour heard no more attempts to contact us. The
1355 same voice that requested our position was heard porti
1355 cially tosting with planes in his formation until they
1355 'faded out. It's just a guess on my part that he may
1355 have sighted something on the surface and wanted to
1355 check our position before taking any action. The
1355 of our transmitter. It was on proper frequency.
1355 Submerged. 'Hill had for position in our sector south
1355 of the Truk for station tonight and tomorrow.
1355 Surfaced.
1355 S.J. radar contact at 15,000 yards. Closed to 9,000
1355 yardes rapidly. (A.C., #41).
1355 radar.
1355 Surfaced.

18 June 1944.
1135 Patroling on station.
0335 Three searchlights observed on Truk.
0335 Searchlights out.
0335 Submerged.
0335 Surfaced. Standing by for air strike scheduled at 1130.
1130 Heard aircraft engines overhead. Sighted one Iaborator
1130 through the haze directly overhead (alt. 10,000 foot
1130 approx.) on course north heading toward Truk (A.C., #42).
1130 heard aircraft engines overhead. Sighted one Iaborator
1130 through the haze. He was on course 270°.
1130 (A.C., #43).
1130 Forward and after torpedo rooms reported sound of
1130 explosions through the hull. Just be the first wave
1130 hitting Truk.
1130 Sighted bomb explosions in direction of Truk.
1130 more explosions reported heard through the hull.
1130 Submerged. Air strike is completed so will avoid
1130 detonation, since we have not been sighted. So far
1130 today.
1130 Surfaced. Ahead a/s 14 knots on 2 main engines on
1130 course 103°.
1130 Departed area, enroute hajuro.
1130 Radar interference bearing 010 Rela tive. It is
1130 probably SIAPPER, for she is scheduled to take over our
1130 area this evening.

-14-

— page 55 —
7

V.S.S.G. CAIO
Report of Ninth War Patrol.

| No | Time | Lat. Long. | Type(s) | Initial Range | Est Course | How Contacted | Further Remarks |
|----|------|||||||
| 12 | 1521 | 10°-55'N. | P.B.M. (?) | 7 Mi. | 010°T. | S.D. | Dived to avoid detection |
| 13 | 0319 | 6°-46'N. | B.Diplane | 6 Mi. | 075°T | S.D. | Dived to avoid detection |
| 14 | 1127 | 6°-26'N. | Three planes | 8 Mi. | 060°T. | S.D. | Dived. |
| 15 | 0752 | 6°-29'N. | Two Vals (?) | 7 Mi. | 130°T. | S.D. | Dived to avoid detection |
| 16 | 0555 | 11°-38'N. | Two Vals (?) | 7 Mi. | 120°T. | S.D. | Dived to avoid detection |
| 17 | 1715 | 6°-22'N. | D-2 (?) | 10 Mi. | 000°T. | S.D. | Dived. |
| 18 | 0005 | 6°-57'N. | Sally | 10 Mi. | 110°T | S.D. | Dived to avoid detection |
| 19 | 072C | 6°-52'N. | Sally | 6 Mi. | 330°T. | S.D. | Dived - Two depths charges. |
| 20 | 1312 | 13°-28'N. | Sally | 8 Mi. | 000°T. | S.D. | Dived to avoid detection |
| 21 | 0951 | 6°-26'N. | Sally | 10 Mi. | 090°T. | S.D. | Dived to avoid detection |
| 22 | 0513 | 7°-22'N. | Sally | 4 Mi. | 210°T. | R(SJ) | S.D. | Dived. |

-19-

— page 56 —
7

CONDITIONAL U.S.S. GAIO Report of Tenth War Patrol.

(C) AIRCRAFT CRITICATES (Cont.)

| No | Time | Lat Long. | Type(s) | Initial | Est. | How | Contacted | Further remarks |
|----|-------||||------|-------|||
| 25 | 0930 | 07°-33'N. | Sally  | 3 Mi.  | 270°T. | P    |           |                |
| 24 | 1005 (K) | 07°-31'N. | Sally  | 8 Mi.  | 250°T. | P    |           |                |
| 25 | 1205 (Y) | 07°-28'N. | Sally  | 10 Mi. | 020°T. | P    |           |                |
| 26 | 1306 (K) | 07°-26'N. | Sally  | 5 Mi.  | 030°T. | P    |           |                |
| 27 | 1255 | 09°-27'N. |         | 4 Mi.  | 130°T. | S.D. | Div'd to avoid detection. |                |
| 28 | 0555 (K) | 09°-46'N. | Float | 5 Mi.  | 090°T. | S.D. | Div'd to avoid detection. |                |
| 29 | 1040 (K) | 06°-45'N. | Pour Hap's | 5 Mi.  | 000°T. | S.D. | Div'd |                |
| 30 | 1121 (K) | 06°-43'N. | Trunk | 3 Mi.  | 100°T. | P    |           |                |
| 31 | 1220 (K) | 06°-42'N. | Pitcher | 2 Mi.  | 140°T. | P    |           |                |
| 32 | 1120 (K) | 06°-42'N. |         | 15 Mi. | S.D. |           | App. currently not sighted |                |
| 33 | 1151 (K) | 06°-43'N. | Kodiak | 10 Mi. | 120°T. | S.D. | Div'd. |                |

-20-

— page 57 —
U.S.S. GARO
Report of Ninth War Patrol

(C) AIRCRAFT CONTACTS (Cont.).

| No | Time Date | L.T. Long. | Type (s) | Initial Range | Dist. Course | Low Course | Further Remarks |
|----||||||||
| 32 | 12-11 (K) | 06-24-1H. | 6-15-44 | 152°-19° E. | 10 11. | 120°T. | S.D. | Div'd. |
| 35 | 22-11 (K) | 07-00-1. | 6-15-44 | 152°-19° E. | 7.5 11. | R (SJ) | Div'd. |
| 36 | 03-16 (V) | 06-26-1. | 6-15-44 | 152°-19° E. | 8 11. | R (SJ) | Div'd. |
| 37 | 11-35 (K) | 06-42-1. | 6-15-44 | 152°-19° E. | 7 11. | 120°T. | S.D. | Div'd. |
| 38 | 11-35 (K) | 06-42-1. | 6-15-44 | 152°-19° E. | 7 11. | 120°T. | S.D. | Div'd. |
| 39 | 11-35 (K) | 06-42-1. | 6-15-44 | 152°-19° E. | 7 11. | 120°T. | S.D. | Div'd. |
| 40 | 11-27 (K) | 06-35-1. | 6-15-44 | 152°-19° E. | 6 11. | 000°T. | S.D. | Div'd. |
| 41 | 22-24 (K) | 06-47-1. | 6-17-42 | 152°-05° E. | 7 11. | R (SJ) | Div'd. |
| 42 | 11-08 (K) | 06-31-1. | 6-18-44 | 152°-19° E. | 7 11. | Overhead | 10,000 Ft. | 000°T | S.D. |
| 43 | 11-15 (K) | 06-31-1. | 6-18-44 | 152°-19° E. | 7 11. | Overhead | 10,000 Ft. | 270°T | S.D. |

-21-

— page 59 —
4. Auxiliary machinery casualties: (cont.)

Due to a worn rotating wedge, a new pin could not be fitted satisfactorily. Condition was ramified by completely replacing 2nd and 4th stage piston assembly.

(L) RADIO

No material difficulties were encountered on this patrol.

PPI was received best on 9000 kt.s., however, this frequency is jammed most by the enemy. 6360 and 4525 kt.s., are both fair frequencies at night. During the day 14390 kt.s., is the best frequency and is not jammed by the Japs. "No worse" unable to receive PPI on 17370 kt.s.

If submarines are to satisfactorily receive voice communications from aircraft, a synchroneterodyme receiver is needed. Reception is very poor and garbled on re-narrative sets.

One serial, Subpac #87 of June 7 or 8, was missed as it was not repeated on the evening schedules.

Enemy jamming was very prompt and efficient during all our transmissions.

PPI received our 100712 at 0730 GMT on June 10 and failed to "progor" for it until 10 minutes after transmission was completed.

(H) RADAR

S.D.-a.

The S.D. was operated, using intermittent keying, during approximately one-half of the patrol. Its performance was poor, the best range on enemy planes being from 2 to 3 miles, although 15 miles was obtained on friendly planes during training period. The resistance of the antenna was not difficult to ground could not withstand deep submergence and mild depth charging (the resistance going as low as 50,000 ohms). After drying the mast out twice by heating and by 25 amperes of current through the coax, tightening the antenna mast assembly, and giving it two coats of Glyptol, a reasonably high resistance was maintained for submergence to 200 feet.

One operational trouble arose, producing a double trace and resulting in no plate current reading and in arcing.

S.J.-a.

The general performance was very good, obtaining maximum range of 30,000 - 35,000 yards on low flying planes, 70,000 yards on land 1400 feet high, 22,000 yards on S.D., and 11,000 yards on a submarine. The following operational

— page 60 —
1. Trouble - loss of power. 2. Trouble - range 25% turned and eventually did out at high ranges. 3. Trouble - loss of usual gain; low mass. 4. Trouble - had detector tube in Range Indicator. V-207 was replaced.

: 1. Both units triggered at beginning of each sweep due to ship noises. The AW was turned off in areas patrolled by enemy planes as we considered it quite possible that the enemy was homing on our radar. Power planes approached us, under very similar conditions, after the set was turned off.

: A.R.C.-1

: Nothing was received in this several attempts which were made to detect enemy transmitting.

: (N) SOUND

: Sound conditions were good during the one time we had a target. Fortunately the only definite temperature gradient we found occurred during the depth charge attack.

: (D) DENSITY A TAGS

: The water in this area is notable for its lack of density layers. In most cases the DT showed isothermal water to depth of 300 feet (sometimes with a gradual reduction of temperature amounting to not more than 1° overall). The one time as noted in this proceeding section the water was isothermal to 320 feet, then a fairly sharp 2° change between 320-330 feet and a gradual negative gradient from 320 to 360 feet. DT cards will be forwarded to the hydrographic office.

— page 61 —
1. HEALTH, FOOD and HABITABILITY
   The health of the crew was excellent throughout the patrol.
   The food was plentiful and well prepared.

   The habitability was generally good. However, as continually being reported by submarines, the circulation in the forward battery compartment could be improved upon.

(Q) PERSONNEL
   The states and training and morale of the crew is good. Subsequent to a turnover of three officers and 23 men since last patrol it has been necessary to make full use of training and lecture periods. Fifteen men were qualified during the patrol. The excellent job done by the lookouts is indicated by the number of planes sighted, some at extreme ranges.

(R) HILLS STAINED - PUSH USED
   | Miles | Gallons |
   |-------||
   | 1258  | 15,891   |
   | 2704  | 24,900   |
   | 5474  | 57,164   |
   | 1330  | 13,232   |
   | 10,826| 111,187  |

(S) DURATION
   Days enroute area: 12.5
   Days in area: 30
   Days enroute base: 3.5
   Days submerged (full): 9 (Partial) 7.
   Days at lldway: 6

(T) FACTORS OF ENDURANCE HABITABILITY
   Torpedoes: 24
   Fuel: 14,776
   Provisions: 15
   Personnel Factor: 10 days

(U) MARK XVIII TORPEDOES
   Eight lkl. XVIII torpedoes were carried by the U.S.S. GATO on the 9th War Patrol, all in the after torpedo room.

   The maintenance and routine doctrine was carried out as prescribed by "Maintenance instructions for lkl. XVIII Torpedoes" issued by Sub.arine Force, Pacific Fleet and as per instructions received from the lkl. XVIII Torpedo School, P.H.T.H.

   All torpedoes in the tubes were pulled and fully charged torpedoes loaded in the tubes every six days. All charging was done in the racks, two torpedoes being charged on the fourth or fifth day after shifting and the other two being charged on the fifth or sixth day after shifting.

— page 64 —
1955-102/A16-3
Serial 039
C-O-N-F-I-D-E-N-T-I-A-L
FIRST ENDORSEMENT TO
GATO Ninth War Patrol.

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

Subject: U.S.S. GATO, (SS212) - Ninth War Patrol - Comments on.

1. The ninth war patrol of the GATO was the first for Lieutenant Commander Farrell in command. Operations in area 15-A were combined with a week of plane guarding off Truk to cover a full month on station. Four days were devoted to submerged patrol and reconnaissance of Woleai Island, otherwise most of the time in the area was spent patrolling on the surface across the shipping lanes Northwest of Truk.

2. GATO's single contact with surface craft occurred on the night of May 28-29 when a convoy of four vessels with five escorts was intercepted. Three attempts to gain firing position were frustrated by escorts turning towards the submarine which was finally forced down at 0300 and depth charged ineffectively. GATO surfaced at 0515 to resume the chase and hung on persistently in spite of having to dive upon sighting a plane at 0619, until three other planes closed in upon her at 1147 and forced her down again. The convoy then opened out to a safe distance ahead.

3. The SD radar which had performed poorly during the first two weeks of the patrol, was rendered out of commission by the depth charging of May 29. The loss of its service is believed to have contributed to the failure of GATO to intercept any targets thereafter, as the numerous visual contacts with planes undoubtedly revealed the presence of the submarine in that locality.

4. It would appear that GATO's positions on plane guard duty were known to the Jap at least as well as to our own forces. This coupled with inadequate communications with our planes, rendered the effort valueless. No planes were reported down while the GATO was in that area.

5. Commander Submarine Division 102 congratulates the officers and crew of the GATO upon their safe return, which in no small degree, is due to the alertness of her lookouts.

6. A normal refit will be conducted by the SPERRY.

T. B. KLAKRING.

— page 65 —
5-10/AI6-3
Serial 0150
CONFIDENTIAL

SECOND MESSAGE:
GATO Ninth War Patrol.

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

Subject: U.S.S. GATO (SS212) - Ninth War Patrol - Comments on.

1. Forwarded, concurring in the endorsement of Commander Submarine Division One Hundred Two.

2. Despite several attempts of the GATO to reach an attack position on the single convoy contacted, flanking escorts succeeded in protecting the convoy from attack. It is of note that the GATO made contact with what was probably the same convoy half an hour after the GATO was driven down following its third attempted night attack, and that PAULIT damaged one of the freighters about an hour later. Both submarines, unseen by each other, later followed the convoy during the day.

Copy to:
YOUSUBUDIV 102,
CO GATO.

— page 66 —
1/2-10/416-3(15)/(16) SUBLARINE FORCE, PACIFIC FLEET
Serial 01365
CONFIDENTIAL
THIRD ENDORSEMENT to
GATO Report of
Ninth War Patrol.
CONSUBSPAC PATROL REPORT NO. 463
U.S.S. GATO - NINTH WAR PATROL.
From: The Commander Submarine Force, Pacific Fleet.
To: The Commander-in-Chief, United States Fleet.
Via: The Commander-in-Chief, U. S. Pacific Fleet.
Subject: U.S.S. GATO (SS212) - Report of Ninth War Patrol.
(30 April to 22 June 1944).

The ninth war patrol of the GATO was conducted in an area West of the Caroline Islands. The patrol was the first for the new Commanding Officer, as such.

Much of the time was spent performing lifeguard mission. Area coverage was good. The GATO was frustrated by active enemy anti-submarine activity in attacking the one contact worthy of torpedoes. The GATO also conducted a photographic reconnaissance of the area.

This patrol is designated as "Successful" for Combat Insignia Award.

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

J. H. BROWN, Jr.

DISTRIBUTION:
(Complete Reports)
Cominch (7)
CNO (5)
Cinepac (6)
Intcl.Con.Pac.Ocean Areas (1)
Comsorvpac (1)
Cinelant (1)
Consusblant (8)
S/M School, NL (2)
Comsopac (2)
Comsowespace (1)
Comsubsowespace (2)
CTF 72 (2)
Comcorpac (1)
Consubspace (40)
SUBAD, NI (2)
ConsubspaceSubordcom (3)
All Squadron and Div.
Commanders, Subspace - (2)
Consubstrainpace (2)
All Submarines, Subspace (1)

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

— page 67 —
1. The Commanding Officer:
To: The Commander-in-Chief, United States Fleet.
Via: (1) The Commander Submarine Division FORTY -TWO
(2) The Commander Submarine Squadron FOUR.
(3) The Commander Submarines, Pacific Fleet.

Subject: U.S.S. GATO - Report of War Patrol Number Ten.

Enclosures: (A) Subject report.
(B) Track Chart (for ConSubPac only)

1. Enclosure (A), covering the Tenth War Patrol of this vessel conducted in the Bonin Islands'Area during the period July 15, 1944 to September 2, 1944, is forwarded herewith.

2. [Handwritten note: PARNELL]

DECLASSIFIED-ART. 0445, OPNAVINST 5510.1C
BY OP-0298E DATE 5/26/72

DECLASSIFIED

— page 68 —
35212/A16 U.S.S. GATO  Report of Tenth War Patrol

CONFIDENTIAL

(A) PROLOGUE:

22 June 1944. Arrived Hajuro Atoll from 9th War Patrol. U.S.S. SPARRY and Subdiv 102 commenced refit. New S.D.-3 Radar; with pre-amplifier installed.
7 July, 1944. Completed refit.
7-12 July, 1944. Post repairs and three (3) days training period. Pired 4 torpedoes, deck guns and automatic guns.
13-14 July, 1944. Final loading.
15 July, 1944. Readiness for sea.

(B) NARRATIVE:

15 July, 1944.
1710 (I) Departed Hajuro for area in accordance with Combat Service Suggestion Operation Order 238-44 of 14 July, 1944. Escorted by U.S.S. CAPTIVATE (AM156) in company with U.S.S. TUNA to southern edge of North-South safety lane.

16 July, 1944.
0906 (I) Parted company with escort (USS CAPTIVATE).
1200 (I) Sighted plane (3-17) distant 4 miles. Apparently search plane. (A.C. #1).

17-21 July, 1944.
Struote patrol area at S/S 13 knots on two main engines. Conducted training dives and fire control drills onstrue. Parted company with U.S.S. TUNA at 2030 (I) on 17th.

22 July, 1944.
1250 (K) Sighted U.S.S. THRESHER thru high periscope, bearing 225°T, distant 10 miles (approximately) on opposite and parallel course (S.C. #1). Did not exchange recognition signals, because of excessive range for Aldis lamp.
1315 (K) Lookout and G.O.D. sighted plane (Betty) bearing 175°T, distant 10 miles, elevation 2°, apparently making run down THRESHER's track. (A.C. #2). Plane then swung left toward us, so at,
1316 (K) Dived. Do not know whether we were sighted or not. Romanoid submerged to routing torpedoes.
1630 (K) Surfaced.

23 July, 1944.
0411 (K) Radar interforonoe bearing 180°T, characteristic of S.J. Apparently U.S.S. GUARDPISH who we are scheduled to pass at this time.

-1- ENCLOSURE A

— page 69 —
23 July, 1943 (Cont.): 0720 (K) Sighted plane (Betty) bearing 270°T, distant 10 miles, elevation 5°, headed toward. (A.C. #5).
: 0721 (K) Divod. Laser gyro follow-up system out of commission; remained submerged attempting ropairs. (See. Section K).
: 0930 (K) Turned clocks back 1 hour to zone (-9) time.
: 0925 (I) Repairs complotod; surfacod.
: 1133 (I) Sighted plane (Betty) bearing 180°T, distant 12 miles, elevation 5°, headed toward. (A.C. #4).
: 1134 (I) Divod. Since we appear to be across the Pagan - Bonin aircraft staging route will spend a few hours submerged training now personnel in diving and depth control.
: 1321 (I) Surfacod.
: 2210 (I) Changed course to 000°T.

24 July, 1944:
: 1900 (I) Entered assigned area 12(P) in Bonin Rotating Patrol.
: 2315 (I) Made Radar-contact on Hashimo Shima, bearing 003°T, distant 16,000 yards.
: 2358 (I) Changed course to 078°T, and headed for Chichi Jima for submerged patrol tomorrow.

Note: After two attempts to repair flooded-out forward and aft bridge TBTs the effort has been unsuccessful. The Idua ship has been in contact with the Navy and is now on its way to the Navy. From now on we will have to depend on bearings to the TDC by word-of-mouth. Apparently the TBTs were too loosely packed during the flight, for this is the first TBT trouble the GATO has had since her last yard overhaul over a year ago.

25 July, 1944:
: 0406 Submerged.
: 1900 Surfacod.
: 2100 Received TWA-contact report. Commenced patrolling up and across, course lino.
: 20 July, 1944.
: 0200 Commenced rotating search curve. No should have had contact by 0200.
: 0450 Submerged. Will conduct submerged patrol across anticipated course of convoy in view of air cover from Chichi Jima - 35 miles distant.

-2-

— page 70 —
26 July, 1944. (Cont.): Sighted tops of two ships (Lat 27°-36'1l, Long 141°-49'3) bearing 165°T, distant 12,000 yards. (S.C. #2). "Another fully ovcreast with intermittent rain squalls. Won't to battle stations and commenced approach. The formation devoloped into one escort, which appeared to be a destroyor, in column ahead of one small cargo ship (2500-3000 tons) similar to Diado Haru on page 107 of 208-J(Rov.); Sub-squont data indicated baac course 140°T, spood 8 knots; target zigzagging between 170°T, and 105°T. Going in for bow tubo attack. As target closed tho escort had all appearances of a destroyor and was definitely radar equipped. TUNA reported as much in her contact report. (Subsquont inspection in tho recognition manila dcfinitely catalogued tho escort as a FG(E)-1.)"

— page 71 —
25 JULY, 1944 (Cont.): 0610 (Cont.)
We ovaded at 2/3'spocd (80 RPM). The sot-up was good - bearings choclod, and with a 94r-99P trcak with practically zero gyro anglos at loast one should have hit. Indications point to torpedoes running under or target manouvoring to avoid. One fact still is not clear. The first explosion which I took for a depth charge occurred at the exact time tho' first torpedo should have crossed tho target trcak. Could it have been a promaturo of one of tho sucoooding torpedoes running in a modoratoly choppy soa at six (6) foot? Foriscoop doth - nothing in sight. The proximity of Chichi Jimo, thoir destination (30 milos), precludes a sucoossful and-around run. This miss was a hard pill to swallow in vlow of tho fact that tho' soo were the first'torpcdoos fired for tho patrol.

1905 Surfacoed.
2022 Ficked up S.J. radar intorforonce. Friendly submarine in adjaecnt arca.

27 July, 1944.
0200 Submerged.
1825 Surfacoed.

28 July, 1944.
0929 Sightod plano (unknown) boaring 054°T, distant 10 milos. Appoarod to bo modium bomber. (A.C. #5).
0931 Submerged, was not dotted.
1055 Surfacoed.
1149 Sightod throe'plancs in formation (single'ongino) boaring 000°T, distant 10 milos (A.C. #6).
1150 Submerged to avoid dotection. Will roman submergod on tho chame tint thoso planos are advance covor for somcthing.
1605 Surfacoed.
1635 S.D. radar contact at 29 milos ('2 pips). Planos did not clossi; faddd out at 30 milos. Planos not sighted visually. (A.C. #7).

29 July, 1944.
0955 Sightod plano (unknown) boaring 270°T, distant 8 milos, (A.C. #8).
0956 Divod to'avoid dotection.
1134 Surfacoed.

30 July, 1944.
Patrolling on surfaco.
2224 All ahoad standard spood 17 imots on four (4) main onginos on baso courso 050°T.

-4-

— page 73 —
1. August, 1944 (Cont.): 1720 (Cont.)
From his information the convoy was three hours ahead of my estimated position of the convoy. This fact but them too far ahead for the GATO to overtake before so reached his destination; with our maximum 17 knots speed on four main engines.
Sighted frondly submarine bearing 270°T, distant 8 miles. (S.C. #6). PINNADO informed us it was the GRAKLER with whom he was joining to proceed to their assigned area.
Set course south for assigned area.
Recoived SHARK contact report on the same convoy. His position report definitely puts the convoy out of our reach.
Lookout sighted two (2) small objects bearing 180°T. (S.C. #7). S.J. radar has no contact. Put storm toward and startd tracking. Radar finally got range of 5000 yards. True bearing changing very slowly to right. Bright moonl'ght night. Put bow to target and startd closing slowly to investigate. According to the plot the two small objects draw slowly to the right, remain steady, and then draw loft. Looks fishy.
Put storm toward and hauled out.
In view of the concentration of our subs, in this area today I dont care to get mixed up with any of thoir patrol boats. In the back of my mind was the recent information we have had of small onmy subs. acting as escorts and decoys.
Changed spood to 10 knots on one main engine and again headed for assigned area. Reoivod ComSubPac serial assigning GATO to a "Special mission" in a few days.

2 August, 1944:
Radar interforcno bearing 200°T, disappeared at 2122.
Startd passage between Chichi Jima and Yomo Jima. Bright moonlight.

3 August, 1944:
Patrolling on station.
S.J. radar contact bearing 336°T, distance 10,000 yards. (S.C. #8). Commenced tracking. Sighted contact at 9,000 yards. Looks like patrol boat, Plot indicates vessel patrolling to the west of the channel we had passed thru between the islands. It appears that we wore sighted by shore lockouts or radar while passing thru and the patrol vessel had d been sent from Chichi Jima, for he was notthoro collar this evening. Decided to keep clear.

-6-

— page 76 —
5 August, 1944.
0041 Received instructions from ComSubPac to return to
Lifeguard station and turn search over to the STERLETT.
On station.
0350 Plane contact on S.J. radar at 5000 yards. Not sighted.
0351 S.D. radar plane contact; numerous friendly. Looks
like strike is about to begin. Started closing Chichi
Jima.
0455 S.J. radar interference; it appears the friendly
surface force is returning.
0549 A.A. fire over Chichi Jima.
0524 STERLETT called over voice frequency using "Equipoise"
and call; he wants to know if we have any friendly
surface craft west of Hoku Jima (that's where they
are now). If he was not told he must have experienced
a few uneasy hours last night. Informed him we did
have. He also wants to know if he is going to have
fighter cover. There he has us stumped. He can use
ours if he needs it. In view of the absence of plane
opposition their main duty now seems to be to keep
over-eager friends of our neck.
0734 Interceptions of interest over the voice circuit:
"Do you see the large AK nearly on the beach in Futami
Ko? Standby with two fish". "Somebody hit the
jackpot in the harbor". "What's he want around
and try it over again". "See the Sub below us? I
think it's our chance (No more made up his mind, for
nothing more came of that).
0754 Fighter cover loft to return to be so.
0507 Sighted friendly task force of northward heading'south.
(S.C. #11). It consisted of one "ATLANTAN" class, three
"DELVALIAND" class, and seven destroyers. Changed course
to close and be recognized.
0820 The leading cruiser is attempting to exchange recognition
signals at 6000 yards, with his large searchlight. Our
little Aldis lamp has a range of about 1000 yards in
daylight. Pulled recognition flare. The starboard
flank screening destroyer headed toward and we were
finally able to exchange signals.
0830 Fighter cover overhead. Fighter cover over surface
craft. Three observation planes in air over cruisers.
It looks like they are going to bombard.
0900 Surface force at 6 to 9 miles of Futami Ko, commenced
bombardment. GATO 9 miles off Futami Ko, taking
pictures and enjoying the show.
0930 The Bombardment group countercharged and started second
run. Gato had an almost uncontrollable impulse to tag
along astern and join in the fun. However in view of
their spappy signal flag manoeuvres, we'd probably foul
up the countermarches. The bombardment group made a
third run and then steamed off to the south. ENCLOSURE A
-9-

— page 77 —
5 August, 1944 (cont.)
0950 (cont.)
During the shelling no air strikes were in progress but started again after the surface force left.
1104 Received forst call for rescu services - 2% milos bearing 100°T, from S.E. corner of Chichi Jima. All ahoad full.
1106 Fighter cover informed me ho did not have enough gas to remain and aid us in the search, and returned to base. So't course to round southern edge of Chichi Jima at 4 milos. Enroute wo passed a small vessel burning to the water lino that had boon hit by the flyers carrier in the morning. (S.C., 12). From the huge black column of smoke ho was probably carrying oil. "hon about 1 milo past the burning ship sighted a raft with what appeared to be a man wearing a yellow lifejacket. Loft full and headed toward warring a yellow lifejacket. with three jays, one wearing a yellow slicker. Right full and continued toward position of reported downplano. For the next 5 or 10 minutes wo had to resort to broken field running, dodging numerous Nips in life jackets and clinging to debris.
1140 Numerous planes overhead roundtovousing after another strike.
1145 Plane jottisoned a bomb 1000 yards off starboard beam. At tho same time wo hoard over tho voice frequency, "Hoy! Lay off that sub!". Hollidvor circling GATO. Ho appears to be going to land.
1149 Ho is.
1150 Flo: nado water landing 1000 yards off tho starboard bow. Manouvoring to pick up two survivors.
1200 Got Lt. Donald F. Holm, USNR., #112685 aboard after considerable difficulty due to rough sea. Ho was fagged out after attempting to keep both himself and his back seat man, J.R. Smy, ARN2e., USNR, afloat. Two of our rescu party went over tho sido in an attempt to assist, but SIOW slipped out of their grasp and sank. Lt. Holm later told us that SIOW had a bad cut (possibly a fractured sluall) in the back of his hoad and appeared to dio as ho was attempting to hold him up. To really felt bad about this failure. HELM had a 5 inch cut on his forchaod which required four stitches. This was taken crro of in a very professional manner by CALLIGER, David R. OPHIL, USN. (Note: On our sucooding rescuos tho ship was flooded down to docks awash, which facilitated picking up survivors; thoir being at practically dock lovol when hauled alongside). Ahoad full - continuing to position of previously reported survivor.

-10-
ENCLOSURE A

— page 78 —
352F/A16
CONFIDENTIAL
(B) NARRATIVE. (Cont.).
5 August, 1944 (Cont.).

1250 On position of reported survivor 25 miles boaring 120°T, from S.E. tip of Chichi Jima. Can see gun emplacoment on crost of tho hill but thoy don't soom to caro much about us. Fighter cover would fool good. No survivor in sight. Tho water is calm horo in tho loo of tho island. Put storm toward boach and started working out slowly. We can't miss spotting anyone if thoy are in this vicinity.
1338 Roo. lvad report of plane down 5 miles boaring 045°T, from center of Chichi Jima. Hoaded toward that spot.
1340 Correction on last report, 15 miles boaring 090°T.
1346 Received additional report of downed plane 20 miles boaring 100°T, from center of Chichi. We will attempt to pick up tho first one now as he is only 4 miles away.
1350 Our fighter cover is back. In fact wo now have four fighters circling the downed survivor.
1409 From fighter cover, "Night ahead of you about 4 miles. I will attempt to drop a life raft to him".
1411 Calvin from 21 Ripsark - "I'll assume S.T. I'm going down". We saw tho life raft drop and headed for that spot.
1425 Pulled up alongside convoy of two life rafts and a set of flashing white tosh, evidently tho result of a smile of rollof on tho part of tho single'occupant.
1426 Picked up Lt (jg) H.A. Hocuc, USNR, #146138, and struck rafts'bolov. Ho had parachuted from his T.B.F. at 1200 foot, and states that his two crew members failed to got out. "Millo manouvoring to pick up Hocuc; tho report of tho survivor at 20 milos boaring 190°T, was corrocted to Okinura Ko, Haha Jimo.
1426 All ahead full. Set course for Okinura Ko, distant 35 milos. While coruotro asked fighter cover to scorch for survivor reported down off S.E. corner of Chichi Jimi (Whoro we had scorchoed providing) Thoy could spot nothing. Promane man won't down with his plane. Two fighters are circling tho man down in Okinura Ko, attempting to provont tho Nips from pickling him up (information via voice circuit). Tho man has no life raft, only a "Hao Wost". We rouquosted a plane to attempt dropping a life raft so that ho could start paddling out.
1542 Protecting plane reports circling harbor at 120 Imots and nothing firing at it yot.
1615 Arrivod. off Okinura Bay - 5 milos to tho contor. Lying to, attempting to havo plans spot survivor and for us to doviso a plan for getting him out. A circling fighter plane dropped us a grid chart of Haha Jimo, giving tho location of tho man.

-11- ENCLOSURE A

— page 79 —
5 August, 1944 (Cont.)
1615 (Cont.)
The conditions existing are as follows:
1. The man is in a "Mao West" 1/2 mile south of Oki
   Misaki close to the roofs just inside the entrance to
   the Bay.
2. Flood tide is tending to set him back into the Bay.
3. A submerged portiscapo roscuo is not feasible
   because of (a) 2000 yard channel onrance prevents
   manuovoring submerged, (b) Period of daylight remaining
   too short, (c) Salvageable waters.
4. Entrance on surface not feasible because of presence
   of shore batteries as indicated on the grid chart
   dropped by the plane, and lack of room for manuovoring,
   Told plane to attempt another life raft drop and that
   we would wait off the entrance of the Bay and fire groon
   flares at intervals so that pilot could paddle out to us.
   Plano dropped life raft, The survivor has now been in
   the water 53 hours with only a life jacket.
Hollcat circling ship is going to make water landing.
Pigheter cover life due to gas shortage.
Lt. Alvin L. Lindsay, USNR, reported aboard.
His plane was out of gas and pretty well shot up.
Lindsay informed us that he had dropped the last life
raft and that the man was now in it. Lindsay was also
the pilot who dropped the grid chart giving the
survivor's position in the Bay. We will remain down
wind off the vicinity of the entrance tonight and fire
groon rockets at intervals in the hope that the pilot,
with which help he can get from the wind, can work his
way in our direction. His raft is not equipped with
paddles, only hand "flippers".
Volunteers to take the GATO's rubber boat into
the harbor in search of the pilot wore unanimous. This
suggestion was vetoed by the Commanding Officer because
of the 100 - 1 chance of contact in this overcast
night and the strong likelihood of their being picked up
by the Nips who will be out in force searching.

6 August, 1944.
No contact as yet on the life raft.
Radar interforronco bearing 160°T. Exchanged challange
and rocognitica signal with COBIA by means of radar.
Radar contact bearing 015°T, at 10,000 yards. Our
position on 5 miles bearing 270°T, from Inuni Zaki, Haha
Jima. Commanded tracking. Pilot gives all indications
of a patrol boat. No definite course and speed. Started
working toward. Dawn breaking. As it became lighter
nothing could be sighted. The radar operators finally
decided (when nothing could be seen) that they had been
tracking a side lobe which was especially strong because
of the proximity of the rugged coast of Haha Jima.

-12- ENGLISHURE A

— page 82 —
15 August, 1944.
Patrolling on surface.

16 August, 1944.
Patrolling on surface.

17 August, 1944.
Submerged for trim.
Submerged.
Radar contact (SD) on two (2) planes at 20 and 30
radar contact (SD) on plane at 8 miles, made quick
dive. (..C, #17).
On depth charge, not too close.
Submerged.

18 August, 1944.
Submerged.
Sighted plane (Botty) thru periscope boaring 2000T,
distant 2 miles. (..C, #18).
Submerged.

19 August, 1944.
Submerged.
Surface.

20 August, 1944.
Patrolling on surface.

21 August, 1944.
Submerged.
Surface.

22 August, 1944.
Submerged.
Surface.
Departing area; set course for Midway in
accordance with Operation Order.

23-25 August, 1944.
Enroute Midway.

26 August, 1944.
Radar contact (SD) on plane at 6 miles - not sighted.
Made quick dive. Probably Kareus search plane.

27-29 August, 1944.
Enroute Midway. Crossed 180th nordian. Lost one day.

29 August, 1944.
Hoorod Midway. Corroioned fueling and discharging
torpedoes.
Undorway onroute Pearl.

ENCLOSURE A

-15-

— page 83 —
35212/16
U.S.S. G.T.O. Report of Tenth War Patrol, 1
CONFIDENTIAL.

(B) NARRATIVE. (Cont.)

30 Aug. 1 Sept., 1944.
Enroute Pearl, Conducted 6 hour battery discharge
enroute.

2 Sept. 1944.
0645(W) Rondzvous with P.O. #108.
1016(W) Loorod, Pearl Harbor.

(C) WEATHER.
The weather in the area was generally calm and agreed
with available information as prevailing winds and rainfall was
concerned.

(D) TIDAL INFORMATION.
Agreed in general as listed in Asiatic and Pacific
Ocean Pilots.

(E) NAVIGATIONAL AIDS.
Nono encountered.

-16- ENCLOSURE A

— page 85 —
7-16-44
S Date: 1200 (L)
B Post: Lat.
M Long.
A Speed
R Course
I Trlr.
N Min. sin last
S.D. radar search
A Number
Type
Probable mission
How contacted
Initial range
Elevation angle
Range & Rel. Dor.
Then it detected us
Stat(Beauf.)
Sot. Direction(Rol)
Visibility (miles)
Clouds sight(ft):
Torrent
Overcast
(Dor.(rol)
Moon-(incl.
(% Illum.
1

— page 87 —
11
: 12
: 13
: 14
: 15

S Date: 8/1/44
U Time (zone): 0836 (I)
D Posit.: Lat.: 29-47 N
M Long.: 141-13 E
A Spec: 2 knots
R Course: 0300T
I Trim: 65 feet
N Min. since last
E S.D. radar search: 1
A Number: 1
R Type: Low wing
R Boat: 3.1 float
C Probable mission: 1
R How contacted: 4 miles
A Initial range: 3
F Elevation angle: 30
T Range Rel. Der. 1
w/o hd detected us: Unknown
C (State I. O. A. U. N. I. S. O. S. C. N. I. S

— page 90 —
55:12/16 U.S.S. G.T.O. Report . Tonth War Patrol

CONFIDENTIAL

(H) ATTACK DATA (Cont)

| MARK TORPEDO | 23 | 23 | 23 | 23 |
||----|----|----|----|
| SERIAL NO.   | 53172 | 41263 | 41099 | 52878 |
| MARK EXPLODER | 6-4 | 6-4 | 6-4 | 6-4 |
| SERIAL NO.   | 3104 | 3786 | 88 | 13161 |
| ACTUATING SET | -- | -- | -- | -- |
| ACTUATING ACTUAL | -- | -- | -- | -- |
| MARK WARNED | 16-1 | 16-1 | 16-1 | 16-1 |
| SERIAL NO.   | 3311 | 11615 | 11309 | 2688 |
| EXPLOSIVE   | TPX | TPX | TPX | TPX |
| FIRING INTERV.L | 0 | 8 | 15 | 8 |
| TYPE SPREAD | Divergent |
| SEAL CONDITIONS | Choppy to Rough. |
| OVERHAUL ACTIVITY | U.S.S. SPERRY (AS-12) |

REMARKS: This set up was good. Bearings checked on continually and with the 95P to 99P track with small gyro angles, at least one of the torpedoes should have hit. The rises may be attributed to running under or target manouvering to avoid. Of interest is the fact that one explosion was heard 1 minute 40 seconds after firing #1 torpedo the correct interval for a timed hit on #1 torpedo.

-23- enclosure a

— page 96 —
212/16 U.S.S. GATO Report of Tenth War Patrol

CONFIDENTIAL

(RADAR (Cont.):

IFP (BN and ABK)

The BN was used extensively during lifeguard duty. We were able to identify friendly planes at ranges greater than the 3D-3 could pick them out. The maximum range exceeded 50 miles. No troubles were encountered in other the BN or the ABK gear.

(IT) SOUND GEAR AND SOLID CONDITIONS.

Sound conditions may be classed as fair. Sub-torrancan background noises off Chichi Jima wore quite pronounced. A good example of the noises emanating can be drawn between it and a crow of carporters hampering wildly in the construction of a building.

During our only contact screws could be heard at a range of 10,000 yards with the JP-1 gear while they wore nover heard with the Supor-sonic gear.

(O) DENSITY LAYERS.

During this period of the year definite temperature gradients were found on each dive; usually between 100 and 250 feet. They varied between 35 to 80. Bathythormograph cards are forwarded under separate cover.

(P) FOOD, HEALTH, and HABITABILITY.

The crew remained in excellent health. There were two cases of boils (or pimples) becoming infected which wore ably treated by the Pharmacists' hatto. In making a crash landing Lt. Holm received a large cut on his forehead which required four (4) stitches.

Food and habitability wore good.

(Q) PERSONNEL.

The performance of duty officers and crew left little to be desired. The disappointing lack of contacts was somewhat recompensed for by the fact that we wore able to be of assistance in rescuers aviators during the strike on the Boning.

The following is a recapitulation of the non qualified and rated during the patrol.

| Number Qualified | Number Not Qual. |
|||
| At start of patrol | 35             |
| Qualified during patrol | 17             |
| At end of patrol | 52             |
| Non rated during patrol | 13             |

ENCLOSURE 1

— page 99 —
352/16
U.S.S. G.T.O. Report
Tenth War Patrol!

CONFIDENTIAL

(X) MRK 18 TORPEDOES. (Cont.)

Four hydrogen burner coils were burnt out this run, two in one torpedo. The cause being probably due to the same torpedoes always being in the tubes, since the current flow was not excessive.

The regular routine was carried out as prescribed, the torpedoes being charged every six days.

Watering was required only by the torpedoes in the tubes, since the torpedoes in the racks wore never force ventilated.

-32-
ENCLOSURE A

— page 100 —
1. The Commander Submarine Division FORTY TWO.
To: The Commander in Chief, United States Fleet.
Via: (1) The Commander Submarine Squadron FOUR.
       (2) The Commander Submarine Force, Pacific Fleet.
       (3) The Commander in Chief, U.S. Pacific Fleet.

Subject: U.S.S. GATO (SS212) - Report of War Patrol Number Ton - Comments on.

1. The tenth War Patrol of the U.S.S. GATO was conducted in the vicinity of the BONIN ISLANDS. The patrol was of 50 days duration, 30 of which were spent in the assigned area, and was terminated by the provisions of the operation order.

2. Only one contact worthy of torpedo fire was encountered.

ATTACK NO. 1
This was a submorgue day periscope attack on a small 2,500 ton AK with a FG escort. The escort was mistaken for a destroyer and four bow torpedoes were fired at him, range 2,500 yards, 95° track angle. All torpedoes missed and depth charging forced the boat to go deep.

3. The GATO did an excellent job of life-guarding in picking up three aviators. It is unfortunate that the resource of one downed aviator could not be afforded because of his position in shallow water close to the shore batteries. The GATO approached sufficiently close to draw their fire which, because of its accuracy, forced her to dive immediately.

4. The GATO will return to Mare Island for overhaul.

5. The Commanding Officer, officers and crew are congratulated on a fine patrol. It is regretted that life-guard missions ordinarily preclude any surface contacts worthy of torpedo fire. It is reported that the presence of submarines engaged in this duty gives our aviators a tremendous boost in morale. The GATO, consequently, can take pride in having performed this duty in a manner to reflect great credit to the Submarine Force.

W. O'REGAN.

— page 101 —
11/tel
Fleet Post Office,
San Francisco, California,
9 September 1944.

SUBMARINE SQUADRON FOUR
FC5-4/A16-3
Serial 0338
CONFIDENTIAL

SECOND ENDORSEMENT to:
U.S.S. GATO Report of
Tenth War Patrol.

From: The Commander Submarine Squadron FOUR.
To: The Commander-in-Chief, United States Fleet.
Via: (1) The Commander Submarine Force, PACIFIC FLEET.
       (2) The Commander-in-Chief, U.S. PACIFIC FLEET.

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

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

2. The suggestions contained in paragraph (U) concerning improvements in the mechanics of "lifeguarding" are excellent, and are recommended for inclusion as an integral part of the current doctrine immediately.

3. The importance of a "lifeguard" mission which brings our airmen back, can only be judged by the immense morale value it has for our fliers. The knowledge that a competent and courageous submarine crew are on call to assist gives the individual flier incentive to press home attacks regardless of probable damage to the aircraft.

4. Commander Submarine Squadron FOUR is pleased to congratulate the Commanding Officer, officers and crew of the U.S.S. GATO for this well executed special mission under enemy fire.

C.F. ERICK

— page 102 —
9 0C62
Care of Fleet Post office,
San Francisco, California,
15 September 1944.

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

COMSUBSPAC PATROL REPORT NO. 521.
U.S.S. GATO - TENTH WAR PATROL.
From: The Commander Submarine Force, Pacific Fleet.
To: The Commander-in-Chief, United States Fleet.
Via: The Commander-in-Chief, U. S. Pacific Fleet.

Subject: U.S.S. GATO (SS212) - Report of Tenth War Patrol.
(15 July to 2 September 1944).

1. The tenth war patrol of the GATO was conducted in the
Bonin Islands Area. In addition to offensive patrol, this GATO was as-
signed lifeguard duties.

2. Excellent area coverage was maintained but only one
contact made. This contact consisted of a small AK with the PG(E)=1
as an escort. An aggressive attack was made but the target avoided
the torpedoes or they ran under. The GATO had a ringside seat for the
air strikes on Chichi Jima on 4 and 5 August. Her daring and alert
performance of lifeguard duty resulted in the rescue of two aviation
personnel.

3. This patrol is designated as "Successful" for Combat
Insignia Award.

4. The Commander Submarine Force, Pacific Fleet, congratu-
lates the commanding officer, officers, and crew for this aggressive
an. successful patrol and joins them in their pride and pleasure for
having rescued the downed aviators.

DISTRIBUTION:
(Complete Reports) J. H. BROWN, Jr.
ComInCh (7)
CNO (5)
CinOpac (6)
Intel.Cen.Pac.Ocean Areas (1)
ComServPac (1)
CinClient (1)
ComSubsLant (8)
S/M School, NL (2)
ComSoPac (2)
ComScivSePac (1)
ComSubsoviesPac (2)
CTF 72 (2)
ComNorPac (1)
ComSubsPac (40)
SUAB, MI (2)
ComSubsPacSubOrdCom (3)

All Squadron and Division
Commanders, Pacific (2)
SubsTrainPac (2)
All Submarines, Pacific (1)

E. L. HYNES, 2ndXtra - ORIGINAL
Flag Secretary. SORG. MICRO
PHOTO-LAB OP-16
RETURN TO F-362

— page 103 —
13 March 1945
Serial: 021
From: The Commanding Officer.
To: The Commander in Chief, United States Fleet.
Via: (1) The Commander Submarine Division-62.
(2) The Commander SubmarineSquadron-20.
(3) The Commander Submarine Force, Pacific Fleet.
Subj: U.S.S. GATO (SS-212) Report of War Patrol Number Eleven.
Encl: (A) Subject report.
(B) Track Chart (for ComSubPac only).

1. Enclosure (A), covering the eleventh war patrol of this vessel, as part of task group 17-16, conducted in the Yellow Sea area during the period 28 January to 13 March 1945, is forwarded herewith.

DECLASSIFIED ART. 0445, OPNAVINST 5510.1C
BY: OPNAV DATE: 12/27/45
DECLASSIFIED

— page 104 —
1954
Arrived Pearl Harbor from Tenth War Patrol on 2 September 1944. Departed Pearl for Navy Yard Mare Island, California on 3 September 1944. Arrived Navy Yard Mare Island on 10 September and commenced overhaul.

All out standing alterations were completed, including hydraulic periscope hoists, installation of Sugar Tare Radar, elongation of conning tower, etc.

Conducted Post Repair Trials, Sound Tests, and deperming. Readiness for sea 6 December 1944.

Lt. (jg) J.G. EVAWS, U.S.N.R. was detached and Lt. J.F. BOSITU, USN reported aboard for duty.

6 Dec.
0900(T) Underway from Mare Island Navy Yard, California enroute San Diego, California in accordance with ComSubPac Op Order. Net escort (PC-768) at San Francisco net and thence enroute operating area to conduct sound training exercises with Western Sea Frontier until 1600.

1600 Enroute San Diego, California.

8 Dec.
1130(T) Underway enroute Pearl Harbor in accordance with ComSubPac Op Order #18-44 with escort (PC-615) until 1600 Dec. 15. Conducting training exercises and dives enroute.

9-14 Dec. Conducted sound training exercises with West Coast Sound School in San Diego Area.

14 Dec.
1530(T) Underway enroute Pearl Harbor in accordance with ComSubPac Op Order #18-44 with escort (PC-615) until 1600 Dec. 15. Conducting training exercises and dives enroute.

21 Dec.
1250(W-V) Koored Submarine Base, Pearl Harbor, Fueled and provisioned. Installed 5 inch deck gun aft. Lt. Comdr. Robert K. Kaufman, U.S.N. was detached.

22 Dec.
1330(T-V) Underway from Pearl Harbor enroute Kajuro, Marshall Islands in accordance with ComSubPac Op Order 418-44 escorted by (PC-426).

1800(W-V) Escort parted company. (a-1)

— page 105 —
22-31 Dec.
Enroute Majuro conducting training exercises and divers' enroute. Dropped one (1) day crossing 180th meridian.

31 Dec.
Rendezvoused with escort (SC-1364).

0912
Moored alongside U.S.S. HOWARD W. GILMORE at Majuro Atoll, Marshall Islands.

31 Dec. to 14 Jan. 1945
Conducted voyage repairs and seven (7) days training under ComSubDiv-222. Conducted sound test. Lt. W. GILMORE, U.S.N.R., and ENS. H.W. GILL, U.S.N. reported aboard for duty. Drydocked in ARD-18 for adjustment of 46 torpedo tube shutter and outer door.

15 Jan.
(B) NARRATIVE

1010(1)
Underway from Majuro enroute Saipan in Company with U.S.S. SUNPISI in accordance with ComSubFac Op Order 14-45. Escorted by U.S.S. PILOT, until 1600. Enroute up safety lane encountered two friendly ships (freighters) - one during daylight and one at night. Tracked them and kept clear.

15-21 Jan.
Enroute Saipan at 10 miles. Conducted communication drills (VHF, CW, and SIT) and tracking drills with U.S.S. SUNPISI. Conducted individual ship's training and dives.

22 Jan.
AFR contact on 108 mcs. Believed to be U.S. Army type (LFK/C#1).

0330 (K)
Renéevoused with escort (LCI-1063).

1246
Moored alongside U.S.S. FULTON in Tanapag harbor, Saipan, Marianas Islands.

22-27 Jan.
Moored alongside U.S.S. FULTON at Saipan. Conducted one day's training under ComSubDiv-81. Replaced one (1) Mk 18-1 torpedo because of battery explosion in tube. (See Section (K) - Major Defects-Ordnance).

28 Jan.
Underway enroute Area Twelve in company with U.S.S. JALLAO in accordance with ComSubFac Op Order #27-45 escorted by LCI-1063. U.S.S. SUNPISI, Task Group Commander 17.18 with task group consisting of SUNPISI, GATO, and JALLAO, was delta yed one day and will join us in the area.

(A-2)

— page 106 —
1500 (A) made trim dive.
1515 Surfaced.
1630 Transferred ERDNKR, K.H., FLC, USNR, 821 62 84 to escort via rubber boat along with records and accounts. Subject man, who had been received from Subdiv-81 relief crew the previous day, fainted upon leaving the harbor, and later complained of body cramps, nausea, etc. Decided then and there that he would be a source of worry for the remainder of the patrol. Upon aiding him to the deck for transfer he fainted again. It was with a sigh of relief that we finally saw him safely on board the escort.

1700 Escort returned to Base.
29 Jan. Narrows area conducting communication, tracking and individual ship's drill in company with JALIAO.
0810 (A) SD contact at 6 miles. IPF response. (A/C#1).
1500 Changed to zone (-9) time.
30 Jan.
0615 (I) made trim dive.
0646 Surfaced.
0930 SD contact at 8 miles. No IPF response. Submerged. (A/C#2).
0950 Surfaced.
1055 Sighted single engine plane (RUPE) SD contact at 10 miles. Submerged. (A/C#5).
1137 Surfaced.
1255 SD contact at 10 miles. No IPF response. Submerged. (A/C#4).
1350 Surfaced.
31 Jan.
0653 (I) SD contact at 10 miles. No IPF response. Contact faded out at 11 miles. (A/C#5).

(A-3)

— page 107 —
1 Feb.
0740 (I) SD contact at 10 miles. (A/C#6). Submerged. Will remain submerged for transit of KAIYO SUDO tonight.

1823 Surfaced. Botne the trainer's and pointer's seats on the 5" gun have been broken off by heavy seas.

2153 SJ radar contact on YAIJO SHITA, distant 70,000 yards.

2330 Commenced transit of KAIYO SUDO on four (4) main engines. Maximum speed 14 knots due to head seas and 5 knot current.

2 Feb. Transitting KAIYO SUDO on four main engines. Encountered radar at 75 mcs on APR (APR/C#2).

0642 (I) Submerged south of DANJO GUNTO.

1915 Surfaced. Crossing Area 9.

3 Feb. SJ radar contact on DANJO (HUNTO range 40,000 yards.

0200 (I) APR contact on 95 mcs. Apparently search radar on DANJO GUNTO. It did not steady on us. (APR/C#3).

1145 Entered area twelve (12).

1445 Lookout sighted 3 sampans at 5,000 yards. Visibility poor due to squalls and mist. (S/C#1). SJ radar had not detected it on because of large wave piles. Avoided. Seas too rough to put gun crews on deck.

1935 Lt. J. P. BOSITO, U.S.N. (A#1). Was felled by wave taken over bridge and thrown against ammunition locker suffering severe contusions and abrasions to his right eye, and bruising his right shoulder.

4 Feb. APR contact on 255 mcs. Did not steady on us. (APR/C#4).

0200 APR contact on 260 mcs. Steaded on us for three (3) minutes, (APR/C#5).

0210 APR contact on 280 mcs. Did not steady on. (APR/C#6) These three contacts all had different PRP. (See Radar section).

(A-4)

— page 108 —
4 Feb.
Cont't.

0730 (I) Submerged.

1644 Surfaced.

1910 SJ radar interference. Exchanged recognition signals with U.S.S. ATUL3. We made arrangements to coordinate our search tonight and tomorrow.

5 Feb.

0735 (I) Submerged.

0816 Sighted aircraft (BATTERY) through periscope, distant 4 miles. (A/C#6).

1843 Surfaced.

1848 SJ radar interference. Exchanged recognition signals and messages with U.S.S. ATUL3. He had no luck on contacts either.

6 Feb. Shifted area in accordance with "Pack" schedule. Patrolling on surface - solid overcast.

0800 (I) Visibility closed to two (2) miles with intermittent snow squalls. SJ radar manned.

1025 SJ radar contact at 5,300 yards, visibility about 3,000 yards. Put target astern. Pip and range indicated a wooden ship. (S/C#2).

1028 Submerged.

1040 Picked up contact in haze, range 4,000 yards. Target tracks at speed of 6 knots using periscope radar. The visibility then increased appreciably and we could make out a Junk sailing wing-and-wing. Let him pass down our starboard side at range 1,000 yards and looked him over. He appears friendly.

1145 Made battle surface, manned 40mm and 20mm guns. Fired a few rounds across his bow and he doused himself immediately. Went alongside and looked him over. They were definitely Chinese. An accurate count of the occupants could not be made for a few heads would peek out of the hatch momentarily and then disappear. An estimate is 8 to 10 in the crew. There were 7 men on deck. When we trained our guns off them we could actually see their sighs of relief. Showed them our

— page 109 —
6 Feb.
: Won't.

colors. Either they were too scared or else they didn't know what it meant. All we got was a half-hearted wave of relief. Vaved them on and continued patrolling.

1730 Converted 4 PBT to NBT.

1650 Submerged to flush out 4 PBT.

1900 Surfaced.

7 Feb. Received China report of a concentration of ships (1 CV and 4 hen-of-war) anchored off Raffles Island. Patrolling on S.S. course to cover their possible route to the Empire.

1005 (I) SD contact at 7 miles. Closed to 6 miles. (A/C#7), made quick dive. Just prior to diving the OOD thought he sighted a floating mino broad on the starboard bow, unfortunately we were unable to investigate.

1100 Surfaced.

1105 Sighted floating mine dead ahead, range 1,500 yards. (Lat. 32-35N; Long. 124-05E). Sank it with 20mm fire. It did not explode.

1155 Sighted another mino (Lat. 32-33N; Long.124-07E). Exploded this one with 30 cal. H.C.

1330 Sighted two (2) floating mines between 1330 and 1445. The time element (we are attempting interception) and rough seas prohibit stopping and sinking these.

1530 Sighted floating mine.

1820 Lookout reported "mine", OOD mistook word as "plane" and dived. (LOST: From now on lookouts will report mines as "objects").

1241 Surfaced.

8 Feb. Patrolling across Vai DISH STRAIT - SHANGHAI route. Seas are building up again after two day's of fairly comfortable riding. Star and Sun sights are few and far between. Navigating mainly by soundings. Sighted two floating mines to-day (Lat. 32-26N; Long. 125-08E), seas too rough to attempt sinking them.

(A-6)

— page 110 —
9 Feb.
1005 (I)
1050
1425
1426
1745
1805
1806
1855
1920
10 Feb.
11 Feb.
0700 (I)
1850
1940
12 Feb.
0201 (I)
0206

Seas abating to force 1 at 0800.
Had dive for trim and for shifting torpedoes in after room for charging.
Surfaced.
SD contact at 6 miles. Closed to 5 miles. (A/C#6).
Submerged. Since there has been no observed air cover in this sector of the area decided to remain submerged for a few hours in case this plane is acting as air search for something coming through.
Surfaced.
Lookout sighted planes. Distant 6 miles apparently headed toward. (A/C#9).
Had quick dive. Looks like we surfaced too soon.
Surfaced.
Transmitted weather report to ComSubPacAdComd. Info. ComSubPac.
Patrolling on surface.
Shifted area in accordance with "Pack" schedule.
Divided for submerged patrol to-day and routing of torpedoes. Patrolling w.st or DANJO CHINO and south of SAISHU TO.
Surfaced.
Sighted loom of eights on horizon to northward. Closed to investigate. The contact developed into two (2) lighted sampans. Avoided in order to remain undetected for tomorrow's patrol. (S/C#5).

SJ radar interference. Exchanged recognition signal with the JALIAO. Had arrangements to patrol in company with him tomorrow. As will be 5 miles to N.W. c2 us on a 240° track we have decided upon. Intercepted a message from the Pack Comdr. in Area Nine directing SAJ CAT to patrol on sea tion 20 miles to the N.S. of our chosen patrol station.
Sighted light of small fishing sampan. Avoided. Thi (A-7)

— page 111 —
12 Feb.
Cont't.

could be the same one as previously contacted this evening - or the Nips are out investigating this part of the area.

0750 Submerged.

1850 Surfaced.

1855 SJ radar interforcance. Exchanged recognition signals with JALIAO. Made arrangements for petrol tonigat and tomorrow across track wo patrolled today.

1940 Transmitted weather report to ComSubFacAdComd. Info, ComSubFac.

2100 AFR contact (#8) on 78 mcs - appears directional.

13 Feb.

0700 (I) Submerged, with radar interforcance still on AFR screen. (AFR/6/9).

1845 Surfaced.

1855 SJ radar interforcance. Exchanged recognition signals with JALIAO. No has had no more luck than 25; so wish-ed each other botter luck and departod for our respec-tivo areas.

2030 Sighted our over-prosant two (2) lighted fishing boats to northward. They seem to remain fairly consis-tently in this part of the area. Obtained first star sights in three (3) days. A good fix still put us only five miles from our D.R.

14 Feb. Patrolling south of SAISHU TO. Quite strong AFR pip on 76 mcs.

0655 (I) Submerged, patrolling S. of SAISHU TO.

1850 Surfaced. AFR contact (#10) on 78 mcs.

1900 OOD sighted two (2) engine plane (PRA/CBS) range 4 miles, elevation 3 dagroos. (A/C#10). Flane was pick-ed up against the evening twilight back-ground.

1901 Made quick dive to 150 ft. and rigged for depth charge. No counter-action so guess he did not see us. AFR gave saturation pip on 72 mcs on surfacing, but I still think this is the radar on SAISHU TO.

(A-8)

— page 112 —
14 Feb.
Cont't.

1930 (I) Surfaced.

2010 SJ radar contact at 15,000 yards bearing 245°(T).
Two (2) targets, (8/9/4). Put stern toward and tracked at range of 10,000 yards.

2045 SJ radar interference at 100°(T). Exchanged recognition signals with JALIAO and informed him of our contact.

2124 With zig-zag plan and speed solved came around and headed in. Targets were plotted on base course 085°(T), speed 10.5 knots, zigging on five and ten minutes legs. The visibility advantages offered by coming in for a starboard track and firing into the sea on a weighted the advantages of firing with the sea on a port track. Set torpedo depth four (4) feet. Targets appear to be two DE's, or small destroyers. We have periodic pinging on 24.2 kcs. No indication of radar.

2143 Targets zigged toward so swing left for stern tube shot.

21-44-10) ATTACK #1. Fired three (5) torpedoes (kk. 1E-1) on 90 starboard track, 167 to 175 gyro angles, torpedo run 2,500 yards, divergent spread (spread from aft-forward).

21-46-50) Two timed and observed hits on leading DE. Target stopped, then disappeared from the radar screen in approximately four (4) minutes, range 5,000 yards. Finging stopped. Commenced reload aft. After torpedo room reported that all tubes were empty. Upon investigation it was found that the torpedoman between the tubes hit the hand firing valve on #7 tube when he should have fired #8. Consequently #7 and #8 torpedoes went out simultaneously. #9 and #10 torpedoes hit.

2160 Commenced approach on remaining target. He had closed sinking target and stopped alongside. When target sank he started maneuvering at various courses and speeds.

2210 Suddenly ten additional pip appeared on the radar screen about 500 yards this side of the target and moved slowly toward us about 1,000 yards. It then completely disappeared from the radar screen. This

— page 113 —
14 Feb.
Con't.

2215
Salvo or 6 to 7 depth charges; range 6,000 yards to 12E. He is now changing course radically, speeding up and slowing down, apparently listening. It is now apparent that the roles have reversed. He is doing the hunting now. He has reversed course and is charging off in the opposite direction. Decided to give him the field and hauled clear.
In retrospect it appears that we ran into a Hunter-Kill group working S.W. of SAISHU TO. The plane was sighted on surfacing this evening was coming from the direction we finally picked up our contact. They could have been working together. The target was finally identified through 7X50 binoculars as a DS(Un-1) rather than a small destroyer, because of its bulkier lines.

2245
SJ radar interference bearing 095°(T). Exchanged recognition signals with JALIAO. Informed him of our results and asked him if he had received any orders from the Pack Comdr. on new patrol stations for the next few days. He then relayed back Comdr. despatched (via SJ) assigning new relayed task Comdr. despatched receipt of message, to Pack Comdr., via CH (TOAACO freq.).

15 Feb.
Lado radar contact on JALIAO at various times this morning. He is on our port beam on course 180°(T) on-route his patrol area.

0645 (I) Submerged.

1900 Surfaced.

1915 SJ radar interference. Exchanged recognition signals and news with JALIAO.

16 Feb.
Enroute new station on two (2) main engines. JALIAO's radar interference faded out at 0200.

(A-10)

— page 114 —
16 Feb.
Con't.
0700 (I)
1925
17 Feb.
0515 (I)
0530
0604
0655
1230
1402
1642
1925
2013
2500
18 Feb.
0643 (I)
0740
1926

Arrived on station. Submerged, patrolling on station.
Surfaced. Patrolling on station.
Set course for coast of China to patrol off ISISAN Island.
AFR contact (#11) on 74 mcs. Apparently land based on ISISAN Is. and non-directional.
Sighted PTYUSIAN Island Lt. bearing 316°(T). Showed normal characteristics.
Radar contact on land bearing 316°(T), distant 38, 000 yards.
Submerged, patrolling off ISISAN Island.
Sighted sailing junk. (S/C/5).
Sighted Junl.
Sighted Dunk.
Surfaced. Set course north for patrol between TWO BROTHERS and LUNA ISLAND.
Possible pinging on sound. Turned away then slowed to listen. "to further pinging heard.
Signed first lights of fishing fleet (S/C/6). Spent the remainder of the evening and morning avoiding. Some lights and some not.

Submerged between TWO BROTHERS and LUNA ISLAND.
Sighted two (2) masts bearing 273°(T). Went to battle stations and commenced approach. (S/C/7). Contact developed into two (2), small fishing trawlers. The remainder of the day, was spent keeping out of their way along with six (6) more of their friends, later picked up. We appear to be right in the middle of their fishing grounds.
Surfaced. Set course North for patrol off IO TO.

(A-11)

— page 115 —
19 Feb.
0200 (I) Crossed SHANGHAI Banks.
0850 Signed mine. (Lat. 32°-59'N; Long. 123°-56'E).
0954 AFR contact (#12) on 76 mcs.
1900 AFR contact (#13) on 155 ncs. Non-directional. Keyed SD-no contact. Interference then faded out.
1930 Cut off pipe railing around forward 20mm gun deck. Two stanchions had given way at their base and caused us to sound like a hack truck at two (2) knots speed submerged.
20 Feb.
0225 (I) SJ radar interference. Exchanged recognition signals with JALLAO.
0445 SJ out of commission.
0525 SJ back in commission. (Sign of relief).
0530 Radar contact on land (NO TO) bearing 104°(T), distant 60,000 yards.
0630 Submerged, patrolling north of KO TO.
0746 Hard distant pinging (one or two) on 17 kcs. Nothing in sight.
1925 Surfaced.
1929 SJ contact at six (6) miles. (A/C/11). Made quick dive. Closed to two (2) miles before antenna want under. SD showed three (3) pips, indication a formation. AR showed no indication of radar between 140-160 mcs. They were not picked up on SJ. NOTES: On a hunch (or call it what you will) we just happened to key the SD prior to lowering the mast and placing it in the stand-by condition.
2022 Surfaced.
2040 AFR contact (#14) at 75 mcs. Weak, non-directional.

(A-12)

— page 116 —
2110 (I)
SJ radar contact bearing 132°(T), distant 15,000 yards.
(S/C#8). Commenced tracking single ship. He tracked at 6 knots on steady course of 310°(T), no escort (a dream come true). Bright moonlight. We can see target at 14,000 yards through No. 1 periscope and 7X50 binoculars. An ideal time to test the ST radar.

2245
In position 4,000 yards off track to starboard and range 11,000 yards submerged and commenced approach. With seven (7) feet of scope exposed, picked up target at 10,000 yards on SJ. Visibility is excellent, and he will be between us and the moon. With his course and speed down cold all"we" have to do is wait till he comes on the range for a 90 starboard straight bow shot.

2311
Target can now be definitely identified as TONE KARU type (page 130 of 20c-J(Revised)). With target due to be on the firing bearing shortly she made a 100° course change to the right. At this time we had only 3 feet of periscope exposed at range of 6,500 yards so I am positive he did not sight us, as we were down moon. We are now on the well known limb. With excessive torpedo run tracked him on course 050°(T), speed 8 knots out to 12,000 yards.

21 Feb.
0020 (I)
Surfaced. Commenced end-around.

0032
APR contact (#15) on 69 mas. Strong, but apparently non-directional.

0238
At range 12,000 yards, 5,000 yards off Port track went to Battle Stations and commenced approach. Moon has now set.

0309 -
03-10-30
ATTACK #2: Fired three (3) Mk 13-1 torpedoes on 70° port track, range 3,000 yards, torpedo run 2,500 yards, 12 to 8 right - gyro angles, depths set three (3) feet. Target appears as big as a house. It can now be definitely identified as not above. He apparently saw us after we fired for smoke poured from his stack as he gave her the coal. One torpedo broached (sea calm).

0312
One timed and observed hit in the stern (4 length of ship from the stern). Target completely enveloped in black smoke. Target stood on her heel and went down vertically, stern first in 2 minutes - 10 seconds. The target's burst of speed after firing no doubt caused the two misses, for the torpedoes were spread from aft-forward with spread reduction of 1° from the normal 4-3-2-1 spread doctrine. Third torpedo hit. It is interesting to note that prior to the two contacts we have had so far we have encountered aircraft upon surfacing.

— page 117 —
21 Feb.
Cont't.
0320 (I) Continued north for patrol off KAKUREPPI RETTO.
0422 Received ComSubPac serial 201742 directing GAT0 to take charge of Task Group 17.18 upon departure of SUNFISH from area.
0639 Submerged.
0755 JP picked up light screws at 025°(T). Nothing in sight at 55 ft.
'1007 Board distant depth charge or depth bomb. Nothing in sight.
1655 JP picked up light screws at 228°(T). Sighted sailing junk and small fishing sampan (S/6%).
1934 Surfaced. SJ made contact at 050°(T), range 1,500 yards at 35 feet. Went down again. No screws heard, but
2031 Surfaced.
2040 AFR contact (#16) on 73 mcs. Strong, but apparently non-directional.
2043 SJ radar contact dead ahead at 2,000 yards. For the remainder of the night until we cleared the fleet at 0030 we got contact any where from 4,000 to 800 yards about every ten minutes. Two unlighted sampans were sighted out of the whole group.
22 Feb. Sat course for patrol across SHANTUNG-KAKUREPPI route.
0645 (I) Submerged.
1554 Sighted aircraft (BETTY) (A/C#12). Range four (4) miles, elevation 3 degrees.
1930 Surfaced. Sighted four small fishing craft during night. Avoided.
23 Feb.
0648 (I) Submerged. Patroling off N.W. point of SHANTUNG Promontory.
1950 Surfaced. Sighted three small fishing craft during night.
(A-14)

— page 118 —
24 Feb.
0641 (I) Submerged. Fatrolling of CHOSAN KAN.
1359 Sighted smoke bearing 060°(T). Battle Stations. (S/C/10). Contact developed into small trawler steaming back and forth between mainland and reef three miles off land.
1927 Surfaced.
22 00 Received ComSubPac serial assigning GATO to lifeguard duty on the 28th.
25 Feb.
0650 (I) Submerged. Fatrolling qff KAUURFFI RITTO.
0915 Sighted sailing junk. (S/C/11). Fassoc close aboard and looked him over.
1928 Surfaced.
1950 AFR contact on 75 mcs. (J/17).
2100 AFR contact (J/18) on 69 mcs.
26 Feb.
0637 (I) Submerged. Fatrolling of KOTO.
0707 Sighted smoke. (S/C/12). Battle Stations. Contact developed into small fishing trawler (too small for torpedo).
1926 Surfaced.
2210 Radar contact at 12,000 yards bearing 246°(I).
2222 Battle Stations, commenced tracking. (S/C/13). Contact developed into single ship on base course 030°(I), speed 10.5 knots with 3 to 4 minutes legs per zig. Bright full noon so we remained at range of 10,000 yards while pulling ahead to get on his track.
27 Feb. We have his zig plan down, so at 0030 (I) Submerged, and commenced approach. SI radar picked him up at 9,500 yards. He appears to be a small patrol or escort type vessel from size of the ships and visually through 7x50 binoculars. No indications of radar.

(A-15)

— page 119 —
27 Feb.
Cont't.

0045 (I)
He is tracking according to his predetermined zigzag plan.

0100
At range of 2,000 yards and just prior to firing he commenced pinching on 17 kcs, speeded up, and presented a zero angle on the bow. Before he turned he was definitely identified as a Chidori. The gyro angles were too great to make a "down-the-throat" shot feasible (50° to 60° left gyro) so went deep. Depth of water 49 fathoms. Before we could stop her without speeding up we settled on the bottom with sound gear and pit log cut. Secured everything. With this muddy bottom we settled as if on a feather mattress.

0105
Heard his screws go close down our Fort side (on JP and through the hull). For the following 20 minutes we followed him up and down our port side, stopping periodically apparently listening, he doesn't seem to be quite sure of his contact; of which we are thankful.

0125
Screws faded out on 0500(T).

0230
Broke loose from bottom by blowing safety. Sound gear can be raised and is apparently not damaged. Fit log rod is bent slightly but operates normally.

0316
Surfaced. All clear. The only explanation I can think of for our being detected by sound is our exceptionally noisy bow planes. It is imperative that they be corrected. They were not entirely satisfactory subsequently to our navy yard overhaul, and they have become progressively worse.

0327
AFR contact (19) on 69 mcs.

0640
Submerged. Facrolling between 10 TO and 10 NOUZAN.

1915
While preparing to surface SJ radar went out. (see Radar section).

2005
SJ radar back in commission. Surfaced.

2009
AFR contact (20) on 161 mcs. Directional. It occasionally trained on us. This is apparently the radar on 10 NOUZAN.

2010
Set course for lifeguard station.

— page 120 —
28 Feb.
Enroute lifeguard station off Shanghai.

0700 (I) Visibility closing-fog.

0800 The visibility closed to zero. The fog persisted until 1400 and then began to clear.

2400 On lifeguard station. Bright full moon. Sighted one unlighted small fishing sampan. He is on our lifeguard station.

1 Mar. Patrolling on station.

0300 (I) Received word from China of 24 hour delay in strike.

0635 Submerged. Patrolling in vicinity of lifeguard station (between LUO'ON and BARREN Islands).

1923 Surfaced.

2030 Sighted lights of two (2) small fishing saupans. They are in the same spot as the one sighted last night, right on our lifeguard position.

2 Mar. Patrolling 10 miles N.Z. of lifeguard station to keep clear of fishing' boets, maintaining position by radar fixes on BARREN Island.

0300 (I) Received word from China informing us that they would keep us informed of their strike schedule. Weather has delayed them so far.

0645 Submerged. Patrolling on lifeguard station.

1100 Received China siked on SD antenna. No additional information.

1920 Surfaced. On station.

3 Mar. Patrolling on lifeguard station.

0500 (I) Received word from China of additional delay in proposed strike. I hope they got their operation off sometime in the near future.

0645 Submerged. On station.

1140 Sighted two (2) small fishing boats. Stayed clear.

1912 Received China sked. on'SD antenna. Lission is again hold up. China requests a weather report from GAZO.

1923 Surfaced.

2030 Received CSP serial 030649 extending patrol three days (until sunset, 7 March 1945.)

(A-17)

— page 121 —
4 Mar. 0400 (I) Sent weather report to China - as requested.
: 0638 Submerged.
: 1545 #2 periscope developed excessive hydraulic oil leak in starboard piston. Vent to 90 feet put #2 out of commission and commenced repairs (see section K). This necessitated having #2 in the fully raised position.
: 1700 Picked up pinging on 17 kcs (two snips doing this pinging). (S/C#14).
: 1715 Pinging getting louder - picked up screws of two small patrol boats. With #2 periscope still out of commission and fully raised, this leaves us in an embarrassing position. Rigged for silent running and attempted to keep storm toward patrol boats. Tracked them in toward us. One passed fairly close down our port hand while the other passed us to starboard at a greater range. They continued on out to the North eastward, no doubt heading for the spot we transmitted to China this morning. We had been expecting something like this all day. It just took them a long time to get here.
: 1745 #2 periscope back in commission.
: 1614 'Pinging and screws faded out. Secured from silent running.
: 1946 Surfac'd. The weather is clearing. The strike should take place tonight.
: 2226 . SJ radar contact bearing 285°(T), distant 4,500 yards. Two (2) pips. Lookout saw momentary light. Our two patrol boats - although they have secured their pinging during darkness. kept clear.

5 Mar.
: 0310 (I) Received word from China that strike would take place about 0015 (I). We had assumed as much. However, nothing was heard on the lifeguard circuits except occasional testing. Will remain on station until we receive word that no planes are down.
: 0615 SJ radar contact at 6,000 yards. Our two patrol boats again. Pulled out to eastward a bit more.

(A-16)

— page 122 —
5 Mar.
Cont't.
0645 (I) Submerged.
1100 Nothing for us on China Skeds.
1850 Surfaced.
1905 Received word from China that all planes were safe and that GATO could now secure. Set course North for patrol area.
6 Mar. Seas building up. Can make only 6 to 7 knots on one main engine without flooding out everything. Sighted 3 floating mines during the day, but did not attempt to sink them because of rough seas.
2200 (I) On station.
7 Mar.
0850 (I) Sighted formation of five (5) planes (unidentified, but single engine) distant, 5 miles. Weather is overcast. (A/6/13).
0851 Made quick dive. Wonder if this can be advance air cover?
1402 Surfaced, patrolling on station. Commenced departure area at sunset.
1925 AFR contact at 77 mcs (#24).
8 Mar.
0415 (I) SJ radar interference. Exchanged recognition signals with TENCH, enroute area 12.
0545 APR contact at 73 mcs (#25). Non-directional - quite weak.
0600 AFR contact at 95 mcs (#26).
0612 Submerged, south of DATTO GUNTO.
1830 Surfaced.

(A-19)

— page 123 —
1840 (I) APR contact at 77 mcs (#27).
1903 SJ radar contact on UJ1 GUNTO 078°(T) distant 55,000 yards.
2345 APR contact at 74 mcs (#28). Weak with an eccentric sweep.
2400 Transitting TOKARA SURATI.
9 Mar. APR contact at 155 mcs (#29). Directional, apparently sweeping to seaward from NAIANO SHINA. Did not steady on us.
0351 YAKU SHINA faded out on SJ radar at 80,000 yards.
1403 Sighted submarine through high periscope. It appeared friendly by virtue of 'Heiffel tower' periscope shears. Named SJ radar and exchanged recognition signals with RAZORBACK. He is heading for Guam also.
10 Mar. Enroute base. RAZORBACK astern about 7 - 9 miles.
0615 (I) Made trim dive.
0825 Surfaced.
0640 Sighted RAZORBACK through high periscope bearing 285°(T), distant 7 miles.
1426 SD contact at 5 miles. Sighted B-29 at 4 miles, on northerly course. (A/0#14). Stood by ready to show recognition signal if he should turn toward us. RAZORBACK (astern about 5 miles) pulled flare and dived. Plane continued majestically on his way, probably to reconnoitre the pounding they gave Tokyo last night in their first 300 plane raid.
1930 RAZORBACK reported sighting white flares bearing 195°(T). We headed over in that direction, RAZORBACK firing green flares intermittently. I think he caught the tail end of a falling star, for they have been coming down in that general area since evening twilight. We were closer to his reported sighting and saw nothing other than falling stars. Nothing further resulted from the search.
2330 RAZORBACK SJ interference faded out astern.
(A-20)

— page 124 —
11 Mar. 11
: 12 Mar. 12
: 0640 (I) 1417 1447 13 Mar. 0945 1239 1740

: Enroute base.
: Sighted PB4Y-2 (Privateer) patrol plane. Plane circled and we exchanged recognition signals. (A/C/15).
: Heavy seas cutting down speed of advance. Reported delay, in arrival at rendezvous, to CG 177.
: SD contact at 5 miles. Hot sighted. Plane above overcast. Faded out at 14 miles. (A/C/16) Friendly IFF response.
: SD contact at 8 miles. Plane not sighted. Friendly IFF response.
: Made rendezvous with escort (PC-824), proceeded Guam Harbor.
: Noord to U.S.S. PROTEUS (AS-19).

— page 129 —
1. ATTACK DATA:
U.S.S. GATO (SS212) TORPEDO ATTACK #1 PATROL NO. ELEVEN
TIME 2114-10(I) DATE 14 Feb. 1945 IAT. 34°48'N LONG. 125°28'E

TARGET DATA - DAMAGE INFLICTED
DESCRIPTION: (EU) Two DE's apparently patrolling from the westward toward SAISHU TO.

SHIP SUNK: One DE-1(UN).

DAMAGE DETERMINED BY: Saw and heard two hits. Large black plume rose from target on first hit. No fire. Leading target disappeared from radar screen in 4 minutes.

TARGET DRAFT ----- COURSE 110°(T) SPEED 11 RANGE 2,800yds. (AT FIRING)

OWN SHIP DATA
SPEED 12kts COURSE 210°(T) DEPTH Surface ANGLE --- (AT FIRING)

FIRE CONTROL & TORPEDO DATA
TYPE ATTACK: Night surface radar, fired on SJ ranges and bearing. Visibility - target only a blur at 5,000 yards night det. and overcast. Target could be made out at 3,000 yards.

TUBES FIRED
TRACK ANGLE : 090S : 090S : 095S
BMC ANGLE : 167(13L)*: 167(13L): 170(10L) : 175(5L)
DEPTH SET : 41 : 41 : 41 : 41
FOVOR : Speed set: in TDC 26°5 knots
HIT OR LISS : Miss : Miss : Hit : Hit
ERHATIC (Yes or No) : No : No : No : No
LARK TORPEDO : 18-1 : 12-2 : 12-2 : 12-2
SERIAL NO. : 56407 : 57639 : 57351 : 57672
MAR. EXPLODER : 8-5 : 8-5 : 8-5 : 8-5
SERIAL NO. : 8716 : 10840 : 9791 : 8215
ACTUATION SET : Cont : Cont : Cont : Cont
ACTUATION ACTUAL : --- : --- : --- : ---
MARK WARHEAD : 18-2 : 18-2 : 18-2 : 18-2
SERIAL NO. : 3747 : 2456 : 2417 : 2451
EXPLOSIVE : TPX : TPX : TPX : TPX
FIRING INTENVAL : * : 10 sec : 10 sec : 10 sec
TYPE SPREAD : 1.5°L : 1.5°L : 1.5°R
SEA CONDITIONS : Sea 4 from 330°(T): swell 2-3 :
OVERHAUL ACTIVITY : GILLORE(AS-16) FURON(AS-11) :

— page 130 —
1. Torpedo run 1st hit 2,430 yards; 2nd hit 2,500 yards. Time to hit: 1st hit 2' - 40"; 2nd hit 2' - 50". Temperature injection 48°F. (actual at time of firing). Temperature electrolyte 53°F (approximate) torpedoes fired, with sea broad on torpedoes port bow. Sea moderate.

#NOTE: - #8 was ordered fired and fired electrically and #7 was fired by hand due to personnel error at the same time. See explanation in report and under ordnance casualties.

— page 131 —
1. USS GATO (SS212) TORPEDO ATTACK NO. 2 PATROL NO. ELEVEN
TIME 0308-55(I) DATE 20-21 February 1945 LAT. 35°24'N LONG. 125°23'E

TARGET DATA * DAMAGE INFLICTED

DESCRIPTION:-(EC) 1. AK TONE MARU Class, (page 130 of 208-J revised.)

SHIP SUNK: - 1. AK above.

DAMAGE DETERMINED BY: Saw and heard one hit. Large ball of flame just aft of midships. Target settled immediately by the stern. Bow rose vertically and target went straight down stern first. Disappeared from sight and radar screen in two minutes fifteen seconds.

DRAFT --- COURSE 050° SPEED 7kts RANGE 2930yds (AT FIRING)

OWN SHIP DATA

SPEED 10kts COURSE 160° DEPTH Surface ANGLE --- (AT FIRING)

FIRE CONTROL & TORPEDO DATA

TYPE ATTACK:-
Night surface radar. Pired on SJ ranges and bearings. And around run after targe t made radical course change on preceding moonlight submerged approach.

(A-28)

— page 132 —
#4  :  #5  :  #6

TRACK AGCLE  : 59°P  : 60°P  : 60°P
GYRO ANGLE  : 012°30'010°50'  : 009°10'
DEPTH SET   : 3 feet:3 feet  : 3 feet
POWER    : Speed :set in TDC 26.0 knots
HIT OR MISS  : Miss :Miss  :Hit
ERRATIC   : No  :No  :No
MARK TORPEDO : 18-2  : 18-1  : 18-1
SEARIAL NO.  : 57503 : 56316 : 57003
MARK EXPLODER : 8-5  : 4-7  : 8-7
SERIAL NO.  : 9888  : 16159 : 10966
ACTUATION SET : 0ont  : 0ont  : 0ont
ACTUATION ACTUAL : 0ont  : 0ont  : 0ont
MARK WARNING : 18-2  : 18-2  : 18-2
SEARIAL NO.  : 3235  : 844  : 3044
EXPLOSIVE  : TPX  : TPX  : TPX
FIRING INTERVAL : 10sec :10 sec :10 sec
TYPE SPREAD  : 1ft  : 0  : 1'1'
SEA CONDITIONS : Sea 3 from 350°(T) Swe1l 2-3
OVRHAUL ACTIVITY :  :
ties  : GILHORE (AS-16) PULTON (AS-11)

REMARKS:-
Torpedo run 2,320 yards. Time to hit 21'-52". Temperature of injection 42°F (Actual at firing). Temperature of Electrolyte 47°F (Approximate). Speed set 26.0 knots. Torpedoes fired running with sea. Sea moderate

(A-29)

— page 134 —
14 Jan: At Kajuero - Hydrogen explosion in 75 tube while alongside U.S.S. HOWARD W. GILMORE. See Mark 16 torpedo report.

21 Jan: Enroute Saipan from Majuro - cross wire illumination lamp in Mark.6 TET Binoculars burnt out. Unable to obtain correct spare from U.S.S. FULTON at Saipan. Put in a shorter length bulb but it would not illuminate crosswire. No spares available at Pearl Harbor.

6 Feb: In area - 40mm jammed during battle surface on sailing junk after firing one shot. Cause was due to the extreme cold which stiffened grease and prevented the loadle loading stop from returning to the ready position. This prevented the star wheels from turning to allow next shell to drop on loading tray. The loader was removed from the gun and taken below, the trouble found, all parts cleaned and greased and the loader reinstalled. A ready box topside for the loader only possibly would correct this and also prevent the loader from corroding.

31 Jan: Enroute area - 5' gun seats - during the rough weather the trainer and pointer seats carried away. The cause was due to poor welding of the vortical adjustment sleeve to the gun mount bracket. Were unable to repair due to lack of heavy welding equipment. Gun, if fired, was to be fired by hand, with the pointer and trainer walking around with gun.

14 Feb: In area - During a surface torpedo attack, stern shot, two torpedoes were fired simultaneously, one electrically from the Conning Tower and one by hand from the after room. This occurred in the following manner. A bow tube approach was being made, when target zigged and the stern tubes were ordered made ready. #7 tube was the last made ready and as only three torpedoes were to be fired, #8, #9 and #10 were given as the firing order. As the storm came to bear #7 ready light came on but the firing order was not changed. The standby switch was turned on in the Conning Tower for #8 tube and number 8 was fired almost immediately from the Conning Tower firing key, however the man standing by the hand firing lever was apparently somewhat excited and hit the hand firing key at the tube when the fire light came on. As both torpedoes went, out together, it was not apparent that any error had been made, until after the tube was opened to pull the torpedo and check for flooding. There was no torpedo in the #7 tube and on checking the impulse gauge it was found that #7 had been fired. On checking the man who had fired the tube, he said he had fired the starboard upper tube but didn't realize this was the wrong firing order until the torpedo was found missing.

— page 135 —
19 Feb.- In area - Oscillation of forward angle solver of TDC, this was discovered during a daily routine check of the TDC. The forward angle solver was oscillating approximately 25° (max.) to 0°(min.) depending on the torpedo run. As the torpedo run increased the oscillations decreased until at the time the solution light went out, the oscillation had ceased altogether. All terminals were checked for grounds and were clear. It was brought out that, it was believed the trouble lay in the forward resolver unit since the range (torpedo run) affected the oscillation, This could be worked on in the area, however the follow up motor and the follow up head could be checked by removing the complete angle solver cover. While deliberating the action to be taken; a target was picked up and the angle solver worked satisfactorily with only slight oscillations at 2500 yard torpedo run and a hit was obtained. See Torpedo Attack #2. In view of the above, and the fact the trouble might become more acute if the TDC was opened up and moisture allowed to enter, nothing was done except to continue the daily checks.

21-22 Feb.- In area - The battery compartment of Mk 18 torpedo #57603 flooded during Torpedo Attack #2. This apparently occurred during the periscope part of the approach, since the same tube had been flooded in attack #1 on the surface and the torpedo had not flooded.

In pulling the torpedo the battery compartment was found to be approximately one third full of water, which apparently had leaked in through #5 and possibly #3 handhole as there was water present on the battery tops under these handholes.

The odor of Chlorine Gas was present - but in no considerable quantity. On checking the torpedo a considerable ground was found and the presence of salt water in the electrolyte in various cells. The torpedo was pulled and put in the rack as a re-load after washing down the cell tops and reducing the ground to a very low current flow. All handholes were absolutely tight and it is believed thespider was bent slightly putting an uneven strain on the gasket.

HULL:

15 Jan.- #1 scope leaked excessively. After two unsuccessful attempts to remedy, the Garlock chevron packing was replaced with flax packing by the U.S.S. HINARD W. GILCHER - leak not stopped. The lantern ring was removed and more flax substituted - leak stopped. - Difficulty in train at this time noted, but not excessive; evidence of scouring had been observed on sides of scope. Since that time efforts to train have varied with water temperature & signs of scouring have increased. The packing was loosened two full turns and lighter grease was used - both with little effect. It is suspected that the bearings are out of allignment.

(A-32)

— page 136 —
6 Feb: Sparling Flow Motor failed. Trouble traced to impeller but no spares on board (none available to repair forces contacted). Kceptor Meter remained non-operative.

12 Feb: Bow planes jammed in power position. Shifted to hand-samo trouble. Finally forced them free by overloading tilting motor & worked them back & forth from full dive to full rise. The shaft & gears had been thoroughly lubricated two days previous. Failure possibly due to slight bond in shaft (due to planos being rigged out in rough seas) causing binding on bearings. No difficulty encountered since installation, the gear box for bow plane, power tilt has been excessively noisy. Condition has been pointed out to all repair forces encountered.

16 Feb: Steering from Corning Tower failed - shifted to Control Room where it functioned normally. Shafting from Corning Tower traced & found to operate normally to gear box in superstructure. From gear box to Control Room stand, turning was erratic. Due to rough weather and comparatively inaccessability of gear box, repairs were inadvisable. Steering from Control Room site.

3 March: - Juvarulic chevron packing on starboard ram of #2 scope loaded excessively under hydraulic pressure. Packing replaced with lecather (in lieu of nooprene) manufactured by U.S.S. HOLMES. Faulty packing found to be badly worn & misshaped. Leather chevron packing has given excellent service since.

ENGINEERING:

19 Jan: - Enroute Lajuro Atoll to Saipan casualty to General Kotors Engine No. 246 A. On January 19 1945 while making a routine start on #1 main engine, a loud knock was heard. The engine was shut down immediately. No load had been put on, Inspection revealed the following casualty. #8 unit; cracked and seized piston, bent connecting rod, broken liner skirt. #16 unit; broken liner skirt. Failure was apparently due to a cracked piston in #8 unit which caused a partial seizure and bending of the connecting rod. On its next downward stroke the rod broke the skirts on Nos. 8 & 16 liners. The start was normal with exhaust leaders draining and test cocks dry. Engine hours since overhaul - 527; engine hours total - 6445.4. NOTE: This engine modified for smoke elimination during last overhaul in bare island Navy Yard, October 1944. This modification includes conversion to cast iron pistons. Repairs were effected at Saipan Island, Marianas.

— page 137 —
6 MAJOR DEFECTS:
Cont's:
ENGINEERING:

Parts removed - #8 unit - N-9709 - connecting rod assembly;
N-9633A - cylinder liner assembly; N-9708-1 - cast iron piston;
N-9707-5, -7, -6 - piston rings; N9709-9 - Piston pin bushing;
N9709-7 - Piston pin. #16 unit N-9633A - cylinder liner assembly.

8 Jan: Trials of Major Atoll, Marshall Group, casualty to General Motors Engine No. 248 A. While making a routine start after surfacing, a heavy pounding was noted in #4 main engine. The engine was stopped immediately. No load had been put on. Inspection of #9 unit showed a cracked liner. Crack was approximately 5" long, extending from a liner stud, vertically, down the side of the liner. Fail-ure was apparently due to metal fatigue. The start was normal with exhaust header drains and test cocks dry. Ronowal of liner assembly was accomplished within 6 hours. Engine hours since overhaul-339.1. Total engine hours-6441.6. NOTE: This engine was modified for smoke elimination during last overhaul in Mare Island Navy Yard, October 1944. This modification includes' conversion to cast iron pistons. Parts renewed - N-9633A - cylinder liner assembly.

3 March: Casualty to main control cubicle. At 2327 on March 3, 1945, while answering a one third bell on the starboard motors, arcing and flames were noted behind board. All main power to control cubicle was killed and all main motor field excitation was cut out. Cause of fire was found to be in the starboard main motor field excitation supply. Supply lead #101 to starboard main motor excitation circuit was burned out. The lead was renewed and thoroughly tested. After satisfactory tests, starboard main motors were energized and put on propulsion at 0005 - march 4, 1945. Cause of casualty was determined to be faulty insulation on supply lead.

6 March: Casualty to auxiliary generator terminal block. Salt water entering engine room through engine induction, soaked insulation around leads connecting terminal block, and caused arcing from terminal block to generator frame. Auxiliary engine was stopped and generator field was killed. Terminal block was removed and washed down with fresh water. After a thorough baking, block was replaced and found to test satisfactorily. Repairs were made on March 6 and generator was put back in service.

— page 138 —
CONFIDENTIAL

(L) RADIO:

In general, radio reception was good; only two ComSubPac serials were missed. Sub Fox was usually received best on 9090 Kcs. During the day 4515 Kcs came in strong and, occasionally, 6045 Kcs was used when 9090 Kcs faded or became silent. During the period of double keying from GUAH and OAHU, the signal was strong but an echo effect was frequently produced which made reception difficult and at times, impossible. The new frequency from OAHU, 9050 Kcs, was received 31 or 32, Frequency 9090 Kcs from GUAH is 55 but it has been difficult to copy at times, seemingly due to improper operation of his keying machine.

Reception from China, NHN, was good except for interference on 4155 Kcs from other transmission of our own and also of the enemy. We were able to receive NHN submerged by means of the SD antenna with signal 33, using our R&H (but not using the RAL). Reception on the WPA&CO frequencies was satisfactory, although it is suggested that less power be used on some transmissions to avoid drowning out nearby signals sent with smaller output.

Our transmissions presented no great difficulties, although we had to rely on relaying in some instances. A weather report was sent to TSNT, via NHN, at the former's request while we were on lifeguard duty. Use of the VHF was limited to the training period and to a few exchanges enroute to the patrol area. Two important troubles arose in connection with the radio gear. Two instances of jamming may be found under "Radio and Radar Countermeasures".

(K) RADAR:

The SJ-a was used continuously at night and at times of limited visibility. No evidence of enemy 10 cm radar was observed, nor was there any reason to believe the enemy was using our SJ for D/F purposes. Good ranges were obtained as follows: Aircraft up to 20,000 yards, DD up to 24,000 yards. CA up to 27,500 yards. Land 315 feet high up to 55,000 yards. Both ship sinkings involved use of SJ ranges and bearings only. However, substantially more trouble arose than on previous runs; this may be attributed to (1) more moisture than usual, (2) addition of the SJ which increased the requirements of the power rectifiers, and (3) the natural ageing of the gear, especially transmitter which is a year and one-half old and the Main Control Unit and the Receiver Indicator which are, two years and one-half old. Total time during which the SJ was entirely inoperative was 65 hours. In addition to routine tube and other part changes the following troubleshooting was

— page 139 —
1. Transcribe: Repeated blowing of fuses 1, 2, 9 and 10 in Main Control Unit and high #V Rectifier current. Cause: Moisture on short in rectifier. We replaced V-1 and heated system about one-half hour before operation was normal.
2. Transcribe: Loss of sweeps on SJ (But not ST). Cause: Bad tubes in Transmitter Modulator Generator.
3. Transcribe: SJ transmitted pulse jittered (but not ST). Cause: Open register R-17, in Transmitter delay multivibrator.
4. Transcribe: No precision sweep. Cause: Bad tube V-14.
5. Transcribe: PTI ceased to rotate. Cause: Broken flexible cable from antenna train assembly. Cable was welded and again broke. We had no SJ spare cable but were able to install a tachometer cable successfully.
6. Transcribe: No Regulated Rectifier current in A unit; repeated blowing of fuses 7 or 8 in Main Control Unit. Cause: Open filament in 5U46, tube V-2.
7. Transcribe: Multiple pulsing of magnitron; jumping pulse. Cause: Open resistor R-39 in Transmitter.
8. Transcribe: Jitter in sweeps; low voltage for B unit Regulated Rectifier. Cause: Bad 5U46, tube V-1.
9. Transcribe: No horizontal control of expandable sweep. Cause: Broken lead in sweep selector switch.

The major portion of Walfpac communications was carried on by keying the SJ. At times, difficulty was experienced in obtaining the attention of the radar operator in the other submarine and some message exchanges took substantial time away from the searching function. However a message exchange was made very quickly during one of our successful approaches without too great loss of range and bearing data. Our SJ reception was greatly improved by construction of a multivibrator circuit to amplify the incoming signal. This circuit was patterned after one given in a patrol report of the U.S.S. ROCH, with a few of our own modifications.

The SD-3 was operated during daylight hours while on the surface using intermittent keying; no D/T by the enemy was encountered. Range on aircraft during patrol ran up to only 20 miles but greater ones on friendly planes were obtained during trial runs. Only two repairs were required: L. Trouble: Impossible to focus. Cause: Increased resistance in R-270. 2. Trouble: Arcing, jitter in pulse, and high plate current. Cause: Bad transmitter tubes (S014-A).

The SJ was maintained in a standby condition whenever the SJ was in use. It proved valuable as a substitute search radar for the SJ, especially during the repair of SJ. Trouble 3 which occurred during very limited visibility. It was used before surfacing at night as a surface search radar in cooperation with the SD for air search. The

— page 140 —
1. RADAR Control:
   - ST was also a help in localizing failures, such as both SJ Trouble 2 and Trouble 3. Very good results were obtained during both trial runs and patrol, including: PC up to 12,000 yards while on the surface. Submarines up to 10,000 yards at 55 feet. LOI up to 6,500 yards at 55 feet. ASP up to 12,000 yards at 57 feet. Enemy CHIDORI up to 9,500 yards. Land 16 feet high up 22,000 yards at 55 feet. During installation and tests at three sub-marine bases, the SP proved quite troublesome and the experts replaced 3 machines, 2 boating oscillators, 4 crystals and 2 T-R tubes. In addition, we encountered the following difficulties:
   1. Trouble: Loss of signals, no crystal current. Cause: Bad T-R tube after only 12 hours of service. The crystal was also ruined by this failure.
   2. Trouble: Low ringing time, low crystal current. Cause: Bad oscillator tube.
   3. Trouble: Tuning exceedingly critical, very bad fading. Cause: After much searching and replacing of tubes, we discovered the ringing time varied considerably by screwing transmitter more or less into frame holder. The wave guide was slightly out of alignment. We had it a bit and obtained smooth and greatly improved operation. This required considerable trial and error testing as the wave guide coupling appears very critical.
   4. Trouble: Noise interference on ST (but not SJ). Cause: Bad preamplifier tube in Transmitter.

The SPK-1/SPA-1 was operated continuously while on the surface. Results of detection may be found in section "Radio and Radar Countermeasures". The following failures arose:
1. Trouble: Loss of SFA-1 power. Cause: Defective power cable.
2. Trouble: Loss of SFA-1 sweep. Cause: Bad X2R rectifier tube.
3. Trouble: Loss of SFA-1 sweep. Cause: Short in secondary of transformer T-201. This failure also required replacing R-201 whose resistance decreased from 100k to 5k.

The TFP was used only to and from the patrol area. Both Bii and BK operated satisfactorily and no troubles arose.

(W) SOUND:
One sound head was manned continuously, both on the surface and submerged. An addition to the JV was manned WAN submerged. Sound conditions were good in the Yellow Sea, especially for the JI which revealed screws of fishing trawlers at exceedingly good ranges, 3,000 to 15,000 yards in several cases and possibly 20,000 yards in another. The JP also was of value in obtaining cavitation data and locating ship noises. The QB picked up screws at 6,000 yards and the JK at 5, 500 yards. Several instances of enemy echo ranging were detected. We made no attempt to echo range on any target. The one important trouble arising on the sound gear (or the aft motor) is as follows: Trouble: Unable to train JN-40 head, fuses blown. Cause: Short in Conning Tower remote control training circuit.

(4-37)

— page 141 —
1. SOUND GEAR AND SOUND CONDITIONS:
   Sound conditions were as predicted in Submarine-Supplement, i.e., good (especially J.P.)

: (O) DENSITY LAYERS:
   No definite layers were found. "o"wever, due to the shallowness of the water, very few dives below periscope depth were made.

: (P) HEALTH, POOD, HABITABILITY:
   Colds, were prevalent during the first part of the patrol on encountering cold weather. They subsided, however, after we became used to the change in climate.

   The food was excellently prepared. However, since about one third of the dry stores room is now taken over by the SD mast, our carrying capacity is greatly reduced; as noted by the reduction and variety of meals during the last two weeks of the patrol. The capacity for carrying fresh potatoes is also further reduced by the addition of the watertight hatches at the bottom of the access hatch trunks. The form of the patrol is also very different from the normal nooks and crannies throughout the boat will have to be found for stowage prior to the next patrol. The ship was comfortable throughout the patrol. The additional booster blower did not get much use while in the area.

: (Q) PERSONNEL:
   1. The performance of duty of both officers and men was of high caliber. Especially to be commended is David R. GALLAGHER, CPN, USN for his professional ability in handling casualties, both routine and unexpected. His job of suturing the eyelid of Lieut. J.F. BOSCIC, USN as a result of being thrown against the 40mm ammunition locker by heavy seas. Worthy of the highest praise.

   2. Number of men on board during patrol - 78
    Number of men qualified at start of patrol - 51
    Number of men qualified at end of patrol - 53
    Number of uncaptified men making first patrol - 16
    Number of men advanced in rating during patrol - 3

: (R) MILITARY STATUS - FUEL USED:
   - N/A

   | Name | Quantity | Type | Weight | Fuel Type | Fuel

— page 142 —
17
Torpedoes - 4,952 Gallons
Fuel - 10 Days
Provisions - 10 Days
Personnel - 10 Days

Limiting factor this patrol - OpOrder and CSP despatch.

(A-39)

— page 143 —
16 torpedoes:

Fourteen Mk 16 torpedoes were carried on the 11th War Patrol of the U.S.S. GATO, a full load of eight aft and six in the tubes forward. In the two attacks made, seven Mk 18's were fired for 3 hits, two in one target and one in another, both targets sank immediately indicating high order explosions by results as well as sound.

Both attacks were made at approximately 2,500 yard torpedo run, the first with a depth set of 4 feet in a force 2 to 5 sea broad on the torpedoes port bow. The torpedo was now observed to broach or run on the surface. The second attack was made with a depth set of 3 feet in a force 2 to 3 sea running astern of the torpedo. The torpedoes ran just under the surface and would occasionally break through a swell and threwnconsiderable spray.

All torpedoes ran straight and normal as tracked by sound at very close to the speed set using the injection temperature and range table and deducting for the shallow depth set.

The charging was no problem due to the cool battery and high gravities seemed to hang on with very little drop. The normal routine was carried out. Average temperature 50°F.

Apparently while alongside the U.S.S. HOWARD W. GILLMON at Nauru a battery explosion occurred in #5 tube just before departing for Saipan. This was not definitely determined until arrival at Saipan and the fish was pulled and inspected by the U.S.S. PULPON.

Enroute to Saipan, it was noted the torpedo would not work properly and on checking at Saipan the vent line in the battery compartment was found kinked. Also a marked war head gasket was found in the forward part of the battery compartment. On further checking this the bulkhead was found to be loose and the torpedo ordered pulled. When the head was removed, a hydrogen explosion was evident and the torpedo was exposed, the explosion having sheared the bolts on the bulkhead.

On questioning the torpedo men in the room they did remember a dull thump shortly after the hydrogen burner was turned on after ventilating the torpedo but assumed it was one of the liberty boats coming alongside, since the GATO was used as the cannon was about at the time, with the cannon being the forward gun.

In view of the fact the torpedo was exposed, it is believed a stronger bulkhead or second bulkhead at the torpedo would be a good safety measure. However the new screened hydrogen burner will prevent any explosions.

Three hydrogen burners were replaced during the run. One follow was in the charging connection was replaced due to burned threads. This took considerable time as the follower was frozen (brass against steel) and had to be cut out and the threads redressed.

It is suggested the burner lead be lengthened by about 4 or 5 feet so that a splice would not have to be made in this line outside the tube to reach the tubes burner terminals on the lower tubes.

— page 144 —
1. Ship or Station - U.S.S. GATO (SS212).
2. Position when enemy radio signals were observed - Lat. 31°9'1", Long. 125°22'E.
3. Position of transmitting Station - unknown.
4. Date of jamming - 9 Feb. 1945 Time: From-1000(Z) To-1050(Z).
5. Frequencies jammed - 8470 Kcs.
6. Describe signal jammed (Freq., type of modulation, etc.) - Variable tone or saw.
7. Use of circuit (tactical, administrative) - tactical; transmitting to NPA.
8. Was enemy jamming signal stable - Yes.
9. What was ratio of strength of own signal to enemy jamming signal - Variable.
10. That was power output of own transmitter at time of jamming - TEL transmitter (200 watts).
11. Location of enemy jammer - Probably land based.
12. Type of jamming signals - Saw or variable tone.
13. Effectiveness of jamming - Complete at first; uneffective later.
14. Action taken to overcome jamming - Slight change in tuning.
15. Landwidth covered by enemy jamming signals - 5 Kcs.
16. Did jamming transmitter appear to be monitored by a look-in recorder - No.
17. If frequency was shifted, how long before enemy jammed now frequency - Frequency was not shifted.
18. Narrative: We were unable to raise NPA but raised NPI, and we were told to relay message through them. However, when the message was completed, we obtained a Roger from both stations.

— page 145 —
1. Ship or Station - U.S.S. GATO (SS212).
2. Position when jammed - Lat. 32°51'N, Long. 125°40'E.
3. Date: 14 Feb. 1945; Time: From 22:10 (I), to 22:15 (I).
4. Radar model jammed - SJ-a; Prog. - 3,000 HOPs.
5. Location of enemy jammer - 6,000 yards from own ship. (Shipborne)
6. Give Range of target:
   (a) When jamming was first noted - 6,000 yards.
   (b) When jamming was effective - Not effective.
   (c) When target was observed through jamming signal - Jamming was single false target.
7. Describe jamming pattern - Fip from false target was the same size as target pip. It was sharp at first; however it did out gradually over about 5 minutes and became fuzzy as it grew smaller.
8. Did the enemy appear to be using a monitor receiver with a look-thru arrangement - No.
9. (a) As the enemy using barrage jamming, spot jamming or reflectors. Reflectors of some sort; likely a radar decoy ballon or single yard.
10. If windows or other reflectors were used -
    (a) At what range and bearing were they released - range was 6,000 yards; bearing 000°(I).
    (b) What was rate of movement - 2 force of wind (about 6 kts);
    (c) What was force and direction of wind - From 000°(I); force 10-12 kts.
11. What countermeasures were taken to reduce effectiveness of jamming as now pip faded and was recognized as false, we returned to target.
12. Narrative: We had been tracking two ships with medium size radar pips and obtained two hits in one. A few minutes after the pip from the latter disappeared, the telescopic made its appearance. It was not present at the start of one sweep on the P.P.I., but showed up on the next, fully as large and as sharp as the remaining target pip. Naturally it caused some confusion to have two pips, then one, and then two again. The telescope was fired seven on the same bearing as the remaining target and about 750 yards near us. It could not possibly have been from the target which was hit. Its range closed at about 3 the force of the wind and in the winds direction, but its amplitude decreased in spite of the reduction in range. We tracked it a few minutes and then returned to the target pip. The false pip became fuzzy as its amplitude decreased and it disappeared in about five minutes, evidently dropping into the sea.
    There was no evidence that the target knew our position as he dropped several dozen charges while we were on the surface 8,000 yards away.

— page 146 —
1. Ship or Station - U.S.S. GATO (SS212)
2. Position when enemy radio signals were observed - Lat. 32°59'N, Long. 123°55'E.
3. Position of Transmitting Station - unknown.
4. Date of Jamming - 19 Feb. 1945 Time: From-0000(Z) To-0530(Z).
5. Frequencies jammed - 7365 Kcs.
6. Describe signal jammed (Freq., type of modulation, etc.) - Wobble-lated tone.
7. Use of circuit (tactical, administrative) - Tactical; reception from China based B-29's.
8. What was ratio of strength of own signal to enemy jamming signal - Did not hear our incoming signal.
9. What was power output of own transmitter at time of jamming - ...
10. Location of enemy jammer - Probably land-based.
11. Type of jamming signals - Obscured tone.
12. Effectiveness of jamming - Probably complete.
13. Action taken to overcome jamming - Tuning (RHO-2); not effective.
14. Bandwidth covered by enemy jamming signals - 10 Kcs.
15. Did jamming transmitter appear to be monitored by a lookout in recovery - No.
16. If frequency was shifted, how long before enemy jammed now frequency - No alternate frequency was available.
17. Narrative: We received no signal on this frequency. Consequently we can not be certain how effective this jamming was. However it was very likely complete.

— page 147 —
1. Ship or Station - U.S.S. GATO (SS212).
2. Area covered on this mission (give dates) - 2 Feb. 1945; 0215 (I); Lat. 31°10'N, Long. 130°00'E.
3. Enemy radar was - Landbased.
4. Intercept Equipment - TN-1/SPR-1/SPA-1.
5. (a) Frequency - 76 kcps
   (b) RF - 1,000 PPS.
   (c) Pulse Width - 30-36 ms.
   (d) Sketch rules
   (e) Was Lobe Switching Used - No.
   (f) Polarization of enemy signal - ---.
   (g) Sweep Rate - Not regular; appeared to be hand trained.
6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI - Air search.
   (b) Evidence for this conclusion - Wide pulse; considerable power; did not center on us.
7. Action of enemy radar, including distances and bearings at which he searched, traced, faded, etc. - continually trained past us, but at a variable speed.
8. Narrative: Radar had large side lobes. Possibly based on southern tip of iYtSHU.

(A-44)

— page 148 —
1. Ship or Station - U.S.S. CA70 (SS212).
2. Area covered on this mission (give dates). - 3 Feb. 1945; 0200 (I); Lat. 31°41'N; Long. 128°10'E. Lost at Lat. 31°55'N; Long. 127°29'E.
3. Enemy radar was Landbased.
4. Intercept Equipment - TN-2/SPR-1/SPA-1.
5. (a) Frequency - 98 MCPS
   (b) PRP - 700 PFS.
   (c) Pulse Width - 16 Ms.
   (d) Skeleton Pulse
   (e) Was Lobe Switching Used - No.
   (f) Polarization of enemy signal - ---.
   (g) Sweep Rate - Steady at 2 minutes, 46 seconds per revolution.
6. Was radar used for surface or air search, GL, SIC, GCI, or AI, ---.
7. Action of enemy radar, including distances and bearings at which he searched, traced, faded, etc. - Also picked up on 6 March with same PRP and very nearly same frequency at Lat. 31°26'N; Long. 128°10'E.
8. Narrative: Radar had a broad beam width, requiring about 30 seconds for main lobe to pass us. It also had prominent side lobes and a small back lobe. We counted 6 side lobes. It is believed to be based on DAJO GUNC.

— page 149 —
3
INSCRIPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or Station - U.S.S. GAZO (SS212).

2. Area covered on this mission (give dates) - 4 Feb. 1945; 0020 (1);
   Lat. 32°06'N; Long. 126°54'E.

3. Enemy radar was believed to be Shipborne.

4. Intercept Equipment TN-2/SPR-1/SFA-1.

5. (a) Frequency - 255 MCPS.
   (b) PRF - 1500 PPS
   (c) Pulse Width - 3 Ms.
   (d) Sketch Pulse

(a) Was Lobo Switching Used - No.
(b) Polarization of enemy signal - ---.
(c) Sweep Rate - One minute, 30 seconds per revolution.

6. Was radar used for surface or air search, GL, SLC, GCI, or AI - ---.

7. Action of enemy radar, including distances and bearings at which he searched, tracked, faced, etc. - Rotated continuously; did not center on us.

8. Narrative: ---.

— page 150 —
1. Ship or Station - U.S.S. GATO (SS212).
2. Area covered on this mission (give dates) - 4 Feb. 1945; 0200 (I);
   Lat. 32°42'N; Long. 125°03'E.
3. Enemy radar was - Shipborne.
4. Intercept Equipment - TN-2/SPR-1/SIA-1.
5. (a) Frequency - 260 and 220 kcps.
   (b) FRF - 2200 PPS.
   (c) Pulse Width - 3 ns.
   (d) Slecth Pulse
    260 kcps
    280 kcps
   (e) Was Lobe Switching Used - No.
   (f) Polarization of enemy signal - ---.
   (g) Sweep Rate - Hot regular; appeared to be hand trained; at times
     it took 4 minutes for one revolution.
6. (a) Was radar used for surface or air search, DL, SLC, GCI, or AI.
   (b) Evidence for this conclusion - The 260 kcps gear stopped on
     us, once for at least 3 minutes.
7. Action of enemy radar, including distances and bearings as which he
   searched, tracked, faded, etc. ---.
8. Narrative: The two frequencies were distinct, both appearing on
   SFA scope at about 270 kcps (although in a greatly reduced size).
   Their rotation rate varied, and only one of the two centered on us,

— page 151 —
12 Feb 1945
Lat. 35° 04'N
Long. 125° 50'E
12 " 31 49N
13 " 32 15N
14 " 33 50N
7 March 32 30N

12 Feb 1945
Lat. 35° 04'N
Long. 125° 50'E
12 " 31 49N
13 " 32 15N
14 " 33 50N
7 March 32 30N

8. Narrative:
   - This signal came in strong near SAIS.UU TO, it was also picked up for short periods on 14 Feb. at 0545; Long. 125° 56'3" and Lat. 35° 31'3"; Long. 125° 56'3", the signal being so weak these times that very little of the pulse was seen on the SFA. The same, or a similar, radar was also picked up weakly on 27 Feb. at Lat. 34° 27'N; Long. 124° 41'3", radar had large beam. We believe it was only sweeping a limited sector, at least part of the time.

(A-48)

— page 152 —
1. Ship or Station - U.S.S. GA-100 (SS-212).
2. Area covered on this mission (give dates) - 17 Feb. 1945; 0515 (I); Lat. 28° 49'N., Long. 122° 44'E.
3. Enemy radar was - Landbased.
4. Intercept Equipment - TR-1/SFR-1/SFA-1.
5. (a) Frequency - 74 Kcps.
   (b) PRF - 400 FPS.
   (c) Pulse Width 20 - 25 Ks.
   (d) Sketch Pulse
   (e) Was Lobe Switching Used - No.
   (f) Focalization of enemy signal - ---.
   (g) Sweep rate - Training not evident.
6. Was radar used for surface or air search, GL, SLC, GCI, or AI, ---.
7. Action of enemy radar, including distances and bearings at which he searched, tracked, faded, etc. - Contact strong and clear in vicinity of HISSAN Island.
8. Narrative: ---.

— page 153 —
1. Ship or Station - U.S.S. GATO (SS212).
2. Area covered on this mission (give dates) - 19 Feb. 1945; 1900 (I); Lct. 34° 24'N., Long. 123° 44'E.
3. Enemy radar was likely - Shipborne.
4. Intercept Equipment - TF-2/SPR-1/SPA-1.
5. (a) Frequency - 152 LCFS
   (b) PRF - 800 PFS
   (c) Pulse Width - 6 - 7 ms.
   (d) Sketch Pulse
   (e) Was lobe Switching Used - No.
   (f) Polarization: O' enemy signal - ---.
   (g) Sweep hate - Non-directional.
6. Was radar used for surface or air search, GL, SLC, GCI, or AI, ---.
7. Action of enemy radar, including distances and bearings at which he searched, tracked, faded, etc. ---.
8. Narrative: This was a brief contact of only 5 minutes and never came in strong. Below, shipborne due to our position and short length of time signal persisted.

— page 154 —
1. Ship or Station - U.S.S. GATO (SS212).
2. Area covered on this mission (give data) - 20 Feb. 1945; 2035 (I); Lat. 35° 09'N., Long. 125° 07'E. Also at Lat. 35° 16'N., Long. 125° 00'E.
3. Enemy radar was believed - Lendbassod.
4. Intercept Equipment - TR-1/SPR-1/SPA-1.
5. (a) Frequency - 75 kcps.
   (b) PRF - 400 - 500 PPS.
   (c) Pulse Width - 20 ms.
   (d) Skatch Pulse
   (e) Was Lobo Switching Used - No.
   (f) Polarize tion of enemy signal - ---.
   (g) Swap Rate - Non-directional.
6. Was radar used for surface or air search, GL, SLC, GCI, or AI, ---.
7. Action of enemy radar, including distances and bearings at which he searched, tracked, faded, etc. In addition, the same type signals were detected as follows:
   - 21 February 1945
   - 25
   - 27
   - 28
   - 25
   -

— page 155 —
24 February 1945
Lat. 37° 54'N
Long. 124° 06'E
24 February 1945
Lat. 37° 54'N
Long. 124° 06'E
27 February 1945
Lat. 37° 54'N
Long

— page 156 —
1. Ship or Station - U.S.S. GATO (SS212).
2. Area covered on this mission (give dates) - 27 Feb. 1945: 2130(I); Lat. 34° 27'N., Long. 124° 41'E.
3. Enemy radar was possibly - Lendbassed.
4. Intercept Equipment - TN-2/SPR-1/SPA-1.
5. (a) Frequency - 159 HCPs.
   (b) PRP - 500 PPS.
   (c) Pulse Width - 5 - 6 ms.
   (d) Sketch pulse
   (e) Was Lobe Switching Used - No.
   (f) Polarization of enemy signal - ---.
   (g) Sweep Rate - Approximately one to two minutes per revolution (hand trained).
6. Was radar used for surface or air search, GL, SLC, GCI, or AI, ---.
7. Action of enemy radar, including distances and bearings at which he searched, tracked, faded, etc. - Lost at Lat. 33° 53'N., Long. 124° 41'E. Flicked up again at Lat. 33° 34'N, Long. 123° 58'E and lost contact at Lat. 33° 19'N, Long. 124° 52'E.
8. Narrative: Both pips rose and fell together. The pulse width given is for the major pip only; the second being about 1/3 as wide. Training speed varied considerably. Radar possibly based on KO TO or DAIKURAN GUNTO.

— page 157 —
1. Ship or Station - U.S.S. GATO (SS212), 2. Area covered on this mission (give dates) - 8 larch 1945:0545(I); Lat. 31° 28'N, Long. 128° 10'E, Same day; 2345(T); Lat. 30° 14'N, Long. 129° 49'E, 3. Enemy radar was probably - Landbased. 4. Intercept Equipment - TR-2/SPR-1/SPA-1. 5. (a) Frequency - 75 Kcps. (b) PRF - 500 PPS. (c) Pulse Width - 30 ms. (d) Sketch Pulse (e) Was Lobe Switching Used - No. (f) Polarization of enemy signal

— page 158 —
12
Report No. 12
CONFIDENTIAL
INTERCEPTION OF ENEMY RADAR TRANSMISSIONS

1. Ship or Station - U.S.S. GATO (SS212).
2. Area covered on this mission (give dates) - 9 March 1945; 0145 (I);
   Lat. 29° 53' N., Long. 130° 29' E.
3. Enemy radar was of unknown type.
4. Intercept Equipment - TN-2/SPR-1/SPA-1.
5. (a) Frequency - 152 MCPS.
   (b) PRF - 500 PPS.
   (c) Pulse Width - 6 Ns.
   (d) Sketch Pulse

(e) Was Lobe Switching Used - No.
(f) Polarization of enemy signal - ---.
(g) Sweep Rate - 45 seconds per sweep.
6. (a) Was radar used for surface or air search, GL, SLC, GCI, or AI-
   Likely air search.
   (b) Evidence for this conclusion - Did not stop on us.
7. Action of enemy radar, including distances and bearings at which
   he searched, tracked, faded, etc. - Appeared to be sweeping sector
   only.
8. Narrative: ---.

— page 161 —
5. Various contact reports were received and despite every effort being made to intercept the convoys and task forces results were negative.

6. The use of window or some other form of Radar countermeasure was noted subsequent to the attack on the DD on 14 February. This momentarily caused some concern but was soon identified by the radar personnel of the GATO.

7. The GATO arrived in GUAM very clean and a normal raft is indicated. The raft will be decapsulated by the USS PROTUS on the return of the submarine.

8. The Division Commander congratulates the Commanding Officer, Officers, and men of the GATO for the successful patrol in which the merchant fleet of the enemy was further reduced and one of his newer anti-submarine vessels sent to the bottom while on the hunt for submarines.

— page 162 —
5-20/8/46-3
Serial: 040
CONTACT: [Name and address]
SECOND DETONATION TO
CO USS G. NO. 15th
Air Patrol, Catoctin
March 1945.

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

Subject: U.S.S. G. NO. (SS212) - Report of ELEVENTH Air Patrol.

1. Forwarded, concurring in the remarks of Commander Submarine Division EIGHTY-TWO.

2. Commander Submarine Squadron TENNY congratulates the commanding Officer, officers and hands on this well conducted aggressive patrol, noteworthy for the construction of one of the enemy's submarine hunters.

3. It is recommended that the U.S.S. G. NO. be credited with the following:

SUNK
1 DE - UN - 1 (EU) 600 tons (Attack #1)
1 Medium AK, TOE Class (EU) 4,100 tons (Attack #2)

Total sunk 4,700 tons

L. S. PARKS.

— page 163 —
6 MAR 1945
NOTE: THIS REPORT WILL BE DISTROYED PRIOR TO ENTERING PATROL AREA.

COLUSBPAC PATROL REPORT NO. 694
U.S.S. GATO - ELEVENTH WAR PATROL.

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

Subject: U.S.S. GATO (SS212) - Report of Eleventh War Patrol (28 January to 13 March 1945).

1. The eleventh war patrol of the GATO, under the command of Commander R. M. Farrell, U.S. Navy, was conducted in the Yellow Sea areas. The GATO, along with the U.S.S. JALIA (SS368) and the U.S.S. SUNFISH (SS281), formed a coordinated attack group with the commanding officer of the SUNFISH for the command of the GATO upon departure of the SUNFISH from the area.

2. This smart, aggressive patrol resulted in three contacts worthy of torpedo fire. Two well planned attacks were delivered resulting in the sinking of a DE and a medium AK.

3. Award of Submarine Combat Insignia for this patrol is authorized.

4. The Commander Submarine Force, Pacific Fleet, congratulates the commanding officer, officers, and crew for this aggressive and successful patrol, another added to the long illustrious record of the GATO. The GATO is credited with having inflicted the following damage upon the enemy during this patrol:

SUNK
1 - DE (UN-1 Type) (EU) - 600 tons (Attack No. 1)
1 - Medium AK (TONN Type) (UC) - 4,100 tons (Attack No. 2)

TOTAL SUNK - 4,700 tons

MERRITT COSTOCK.

Authentication & distribution on following page.

— page 164 —
1945, 1st Patrol, 694 Submarine Patrol Report No. 694
U.S.S. GATO - ELEVENTH WAR PATROL

Subject: U.S.S. GATO (SS212) - Report of Eleventh War Patrol
(28 January to 13 March 1945).

DISTRIBUTION:
(Complete Reports)
ComInch (7)
CNO (5)
CIncap (6)
JICP04 (1)
ADICP04 (1)
Conservpac (1)
Cinclant (8)
Consub (1)
S/Mi School, NL (2)
CO, S/Mi Base, PH (2)
Consopac (1)
Consowespac (2)
Consubswespac (2)
CTG 71.9 (1)
Consorpac (1)
Consubspac (3)
Consubspac4d (40)
SUBD, MI (2)
ConsubspacSubordoom (3)
All Squadron and Div. (2)
Commanders, Pacific (2)
Substrainpac (1)
All Submarines, Pacific (1)

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

— page 165 —
3 June 1945
SS212/A16-3
DECLASSIFIED

From: Commanding Officer, U.S.S. GATO.
To: Commander in Chief, United States Fleet.
Via: (1) Commander Submarine Division - 103.
       (2) Commander Submarine Squadron - 10.
       (3) Commander Submarine Force, Pacific Fleet.

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

Enclosures: (A) Subject Report,
            (B) Track Chart.

Enclosure (A), covering the twelfth war patrol of this vessel conducted in the Bungo Suido area the period 12 April, 1945 to 3 June, 1945, is forwarded herewith.

R. HOLDEN.

DECLASSIFIED ART. 0445, QPNAVINST 5510.10
BY O.P. 0986- DATE 5/26/42

DECLASSIFIED

— page 168 —
16 April 1945

1200K Position
Lat. - 24-07.5N
Long. - 137-56.0E

0539 Made trim dive.

17 April 1945

1200K Position
Lat. - 27-23.5N
Long. - 137-18.2E

0033 Received message from ComSubPac directing us to search for downed aviator. Set course for point, four engine speed.
0550 Transmitted GATO first to ComSubPac.
0712 Sighted U.S.S. CERO.
0735 Commenced search with CERO using reported position as origin. CRUCIBLE took western and GATO eastern semi-circles travelling circumferentially in five thousand yard radial increments.
0940 10,000 yard circle completed. While receiving visual messages from CERO, single tail B-24 entered the scene. At three miles, with all still in profile, ITP response and an angle on the bow of zero, dove into the colors up. These eager zoanies are difficult to attain.

1000 Surfaced. Resumed search.
1350 TINA. I reported in and took the ten mile circle.
1430 Notified SFADEFISI of current search plan, requesting instructions.
1832 Sunset. Discontinued search on ComSubPac's orders.
1935 Night L.D. Born, Asst. 00D, sighted mine Lat. 27-33.0N, Long. 137-20.0E on starboard bow, distant 200 yds. Haneuvered to put it against the twilight.
1940 Commenced firing bridge 20mm.
1942 Screened mine exploded when halfway thru second magazine. Range 300 yards.
2052 Received message from ATLUE assigning us our area.

18 April 1945

1200I Position
Lat. - 30-22.0N
Long. - 135-27.5E

0550K Made trim dive.
0900 Set clocks to Item (-9 zone) time.
0930 B-29 commenced circling us. Established communication on VHF. Directed him to CERO, for whom he was looking. Own planes have been around us intermittently since we left: Guam. No separate reports of them are made unless they affect GATO operations. Tonight we enter area with the missions of life-guard, scouting and acting as in of the corks for the Inland Sea.

— page 169 —
18 April 1945 (Cont'd)

A daylight submerged patrol is indicated as close in as we can get and still keep clear of possible newly laid anti-invasion minefields. Night cruising will be done using ST, S7 radar and APR. On 150, 170 and 210 megacycles contacts, we will be keyed for 1 second and a quick sweep will be made on the 40,000 yard scale of the PPI. If there are no pips we will swing ship and attempt to develop contact a la DAPPSH.

Our UDM watch has a ten knot sector card mounted over the bearing scale of the chemical recorder. For speeds above ten knots this card gives the proper action to take for torpedo traces appearing beneath each sector. In the Dive sector, he shouts "Dive Dive" over 7 NC to the bridge. The quartermaster sounds the "Diving alarm, OOD shouts "Clear the bridge" and passes "Dive Dive" over 1 NC. In other sectors the UDA operator puts rudder over accordingly.

19 April 1945

1200I Position
Lat. - 32-53N
Long. - 135-51.8E

0115 Exchanged recognition signals with U.S.S. HACHIBASHI.
0524 Submerged to patrol northeast of Ashizuri Saki.
0957 LT. J.M. Connolly, USNR, sighted mine thru periscope.
1015 Surface. Wind and sea increasing in strength. Attempted to sink mine by 20mm gun-fire at ranges from three to five hundred yards. Seas are too rough. Lat. 33-05N, Long. 133-47E
Wind is from the south, force 6. Seas state five. The barometer indicates a gale is making up. Set course 180°T to reach night rendezvous with THREADFIN and ATULE.

1634 W. 38S state six, wind hauled around to west, visibility cleared, making Shikoku plainly visible. Submerged.
1948 Surface. Seas are sufficiently rough to prevent our reaching midnight rendezvous. Will dive south of Ashizuri Saki and investigate it tomorrow.

20 Apr 1 1945

1201I Position
Lat. - 32-36.3N
Long. - 135-15.8E

0422 Submerged.
1053 ST radar interference. Attempted to challenge.
1115 Established communications with THREADFIN via ST radar while submerged. Was advised they were going to investigate Okino Shima.
1510 ST range 18,200 yards on Ashizuri Saki. Visibility is very hazy. Navigating on soundings and ST ranges.

— page 170 —
20 April 1945 (Cont'd)
1700 Am now three miles south of Ashizur Saki. The long submerged run was necessary to avoid being picked up by shore radar. Discovered ST interference to west of me. THIRRAPIN rig. Only, hunting points are getting too crowded.
1950 Corr. opened opening out. Will try this area again. With more inverstage of the lure Shio, should be able to cut down submerged time.
2115 Surfaced.

: 21 April 1945
1200F Position
Lat. - 32-39N
Long. - 135-36.3E

0059 Plans on SJ, closing fast.
0101 With range of 4,000 yards, closing, submerged.
0124 All clear, surfaced. Evidently a Jap plane going home.
0450 Subr. rigged. Bow plane tilt is frozen.
0959 Surfaced to ascertain if we had fouled fish net. Planes approached to be clear.
1012 Sunrigged to 90 ft. Wor'ng on bow planes. The lock-mut was crossed, released on the bow-plane tilting drive worm, and was binding against the end-plate. See material defects. This was faulty mare Island Work, J.O. No. L1-2203, Code 28354, and cost us one day of patrol.
2010 Bow planes repaired. Surfaced. Headed for life-guard station.

: 22 April 1945
1200F Position
Lat. - 31-09.5N
Long. - 132-50.2E

0306 SJ plane contact, 7 miles.
0350 SJ plane contact, 22 miles.
0521 Made trim dive.
0613 Surfaced. B-291s appeared overhead throught the morning.
0830 On life-guard station.
0917 00D, Lt. J.M. Connolly, USNR, sighted mine, Lat. 31-00N, Long. 132-55E. Exploded same with 20mm gun-fire.
1030 Secured from life guard station. Submerged.
1530 Surfaced, heading for Bungo Suido.
1640 ODL, Lt. W.W. Graham sighted float type plane distant 8 mile Submerged.
1928 Surfaced. Flat calm, bright moon.
2039 SJ radar plane contact, 2,100 yards, submerged.
2101 Surfaced.
2150 Torpedo contact on TDM. Divel. Torpedo passed ahead. Rigge for silent running. All 1ear on sound. Opened to east.
2325 Surfaced.

— page 171 —
23 April 1945

1200I Position:
Lat. - 32-27N
Long. - 133-155E

0105 Torpedo on TDI. Dived. Torpedo passed down port side. This is getting exasperating. We cannot get any SJ contacts on our friends. They are probably midget subs along whose scouting line we had unfortunately laid our base course. The Arma Course Clock ar... "Dia have saved our necks tonight."

0221 Surfaced. Cleared area to eastward on four main engines, cannot get into bungo tonight, will patrol off Ashizuri Saki.

0400 Submerged.
1940 Surfaced. Bright moonlight, flat calm.
2202 Plane on SJ radar, 6 miles closing fast. Submerged.
2257 Surfaced.

24 April 1945

1200I Position:
Lat. - 32-30N
Long. - 133-32.7E

0215 Plane contact on SJ, 3 miles, submerged. An electric cable thru the conning tower developed a bad leak around its packing gland.

0530 Leak is repaired, but its too light for surfacing. We will stay down. Flat calm.

1950 Surfaced.
2306 Plane at 6 miles, closing. Submerged.
2338 Surfaced. Sea is calm with a bright moon.

25 April 1945

1200I Position:
Lat. - 32-30N
Long. - 132-46E

0427 Submerged. Heading in to Okino Shima. Wind and sea condition three. Making periscope sweeps every ten minutes.

1949 Spent the day patrolling inside the hundred fathom curve between Okino Shima and Ashizuri between four and ten miles from the beach. Where is the shipping? Surfaced - opened out on four main engines and proceeded to life guard station.

26 April 1945

-1200I Position
Lat. - 30-56.5N
Long. - 131-43.5E

0435 At life guard point. Submerged.

— page 172 —
26 April 1945 (Cont'd)
0700 Surfaced ten miles off Van Diemen Strait. Established communication with our B-29. Also have P-51's. Wind force 5, sea state 5 from east. Low visibility.
0857 B-29 told us we were all clear and that it was leaving. Put two men on deck and repacked leaking DRT cable. Found that it had no outside pa cking at all. This was the work of Nav Yard, hare Island. We could not make out our Mustang cover although we had friendly IFP. Felt justified in accomplishing some more top-side work and repaired No. 4PBT vent.
1011 Japs are jamming 4475. Evidently the B-29's are finished and the P-51's are over the target.
1017 Cloudhopper 4 told us a c.c.cken was down in our vicinity and that he had no more information.
1121 Asked ARUME if they had any more information about chicken. They didn't. He don't have anything to go on. Visibility 1 low, seas are rough.
1140 Decided to remain here and wait for amplifying data from Com SubPac tonight. We will conduct search tonight and tomorrow on his information. Cannot understand why the Mustangs couldn't give us some approximate information on the location of the plane. Submerged and opened to east.
1056 Surfaced. Bright moon, flat calm.
2214 Plane contact, 15 miles.
2252 Headed for life guard station.

27 April 1945
1200T Position
Lat. - 31-25N
Long. - 131-48E
0148 Plane at 3 miles. Submerged.
0223 Surfaced.
0430 Submerged.
0757 Surfaced on life guard station. Established communication with planes.
0942 Plane down 200ft, distant 56 miles. But on four main engine blew every thing dry and manned bridge guns. Do not plan to be forced down.
1030 A Zere entered the scene, looked and departed. Our cover did not see him.
1255 Arrived in area. Three B-29's are circling. They have done a very nice job of coming me. Sea state two, wind force two.
1257 Sighted survivor in a one-man raft. He saw us started waving his life belt.
1300 Recovered Corporal (Police Gene Tarn, 37528988, USAAF, 39th Hour Group, 62nd BomSquadron, who had been in the water three hours.
1304 Sighted second survivor.
1310 Recovered sergeant David L. Hirsch, 34687507, USAAF.
1316 Sighted empty life raft. Sank by gun-fire.
1326 Sighted 3rd survivor.

— page 173 —
27 April 1945 (Cont'd)

1332 Recovered 2nd Lt. Frank Lemont Johnson, O-2068394, USAAP, of the same unit. He discovered us only after we vented l & 2 main ballast tanks alongside him. Our Coding Board is now complete. At this time we were about twenty two miles southeast of Toi Hisaki.

1352 Completed search of area. Headed for point where this plan crashed.

1430 Arrived at gasoline slick. Sighted wreckage of plane. Its bombs, which had failed to release over target, exploded when the plane crashed. Four of the crew jumped. One chute did not open. The rest did not get out. We took kodachrom movies of the recovery w.ich we hope will turn out.

1515 Submerged. Plane cover nas been gone for an hour.

1951 Surfaced. Brigit moon, flat calm.

2017 Received notice to be on same life guard station tomorrow.

2206 Plane at 5 miles. Submerged. This guy always gets us when we are on the finishing rate of the battery charge.

2306 Surfaced.

2311 Plane at 8 miles. Moved out.

2337 Plane at 7 miles.

26 April 1945

1200I Position
Lat. - 31-26N
Long. - 132-05.4E

0430 Submerged.

0758 Surfaced on lifeguard station. Contacted Dumbo.

1015 intercepted message on 4475 kcs that plane had ditched 75 miles bearing 160° from Josaki Hana. Told plane, bent on four engines, blew everything and headed for point.

1246 Ordered our covering Dumbo to investigate this point. Our other Dumbo never has shown up.

1303 Our Dumbo reported he saw nothing at this point. Dumbo the returned to base.

1419 Received message from ComSubFac that our plane was thirty five miles from Josaki hanna on the same bearing. We have an eighty mile goose-chase. Decided to search first report position anyway as it was close by.

1437 No signs of downed plane. Headed for new point.

1621 Commenced searching at new point running 16 to 20 miles fro Toi Hisaki.

1046 Forced down by plane.

1954 Surfaced. Brigit moon, flat calm.

2115 Betty passed down port size 200 yards. We were heading up-moon. Submerged. Decided that inasmuch as we were getting coverage in the normin' to stay down all night at 55 ft., keep an S1watch, and set some rest. For seven out of the past nine nights we have been forced down by night planes. The planes don't bother us as much during the day as they d at night.

— page 174 —
29 April 1945

12001 Position
Lat. - 31-06.3N
Long. - 131-39.6E

0505 Received message from ComSubPac to take life guard at survival position.
0753 Suri. cod on new life guard station after a good nights sleep
0815 Established communications with our Dumbo who commenced giving us courses to steer. The day is clear and the sea is flat.
0947 Plane Hascot 5 reported to our Dumbo and us that survivors were in the water. Dumbo has the conn and also has no IPP.
1016 Our Dumbo, has led us to point 5 miles from Toi Misaki. Kyushu is nicely visible - or navigational purposes. At this time he charred our course to south. We are still on 4 nautical engines, everything blown up, bridge 20mm and 40mm manned.
Our Dumbo has reported bands in the area.
1022 Dumbo changed our course to 1400ft. I do not want to get forced down until after we get the survivors.
1057 A float type Zello entered the scene on our port beam distant three miles. Dumbo saw him and we both opened fire simultaneously. Our 20 and 40mm tracers were meeting him nicely but he kept on coming. At 60 degree position angle he nose over and headed down at 15. We were doing all right until saw two bombs release from his belly, with a zero angle on the bow.
1058 Put the rudder hard left, yelled "Take cover!" and proceeded to carry out my orders.
1058-03 The first bomb exploded to starboard and the second about 15 feet astern. We were making 19 kts.
1058-07 Resumed revenge fire.
1059-30 Zelle pulled out of his dive, climbed up to a thousand feet and did a nice wing over for a strafing run. Cleared the bridge. Dumbo had only got in an initial burst and was trying to maneuver. Put rudder amidship, dived, and let Dumbo snoot to his heart's content. This is interesting work, but I feel we need a little more fire power to exploit it successfully.
1100 Arrived at 150 ft. to take stock of the situation. Discovered that our camera fan, Ensign Lloyd Greene, USNR, had been taking movies of the proceedings up until the time of "Bomb away". Our mess-boy, Will, 20mm loader beat gravity in close the bridge and left the metal part of his helmet up there.
Rang thru the main power circuits, found everything all right and at.
1125 Suri. Scurfaced. How was have two Dumbos and no Zekes. Went to main engines to reach survivors. Dumbo told us there are bandits in area.
1214 Doolittle 45 has a single survivor in sight to the north. We are to steer 3400ft.

— page 175 —
29 April 1945

1215 Put 3 mains on propulsion, heading for the survivors.
1239 Our float Zeke returned for some more of the same. Dived.
I am beginning to doubt the efficacy of our Dumbos.
1400 Surfaecd. Our Dumbos have gone home. Put four main engine on the line and headed up on 3400T.
1440 Sighted airplane debris.
1442 Sighted raft.
1456 Picked up Sergeant Jack S. Cannon, 499 Group, 877th Bomber Squadron, USAF. Dumbo had dropped him a seven man raft and he was fixed for thirty days. He crashed yesterday. As we were twelve miles from the beach he thought we were Japs. He had covered the raft with his blue blankets and lowered his sail, trying to make himself inconspicuous. Later he said that when he saw us getting closer he resigned himself to his fate, took a drink out of his canteen and waited for the machine gun bullets. He was the last of the only six to jump. His chute opened just before he hit the water. Appa ently he jumped from 500 ft. at an airspeed of 240 m.p.h. That would put the others within five miles to the north, parachute drop which was 5400 ft. He started to climb. Searched west three miles and north four miles to within eight miles of the beach. Headed east and then north zig zagging across plane track and current set.
1544 Sighted 20 Ettys. Are they looking for us or for Okinawa. Dived.
1700 Surfaced. Continued search.
1832 Have searched an area c.i. c. Then by twelve miles. It is too dark to see, so headed away from the beach. Dumbo had reported only this survivor in the water. Talking it over with the other aviators later, I believe the following happened: This plane was badly hit over Miyazaki which they were bombing from 15,000 feet. The right hand engines were out. The pilot headed out over water. They were losing altitude fast and at 2000 ft. the alarm bell was sounded. Five jumped ahead of Cannon, who pulled his rip cord on jumping. He is small and the high speed of the plane did not cause his shrouds to break when the chute opened. His chute opened just before he hit the water and it carried him under long enough that when he reached surface he could not see the plane whose debris was around him. The others who jumped were heavier by thirty pounds, he said. If they delayed pulling their cords too much, they'd be too late. If they pulled their rip cords before their bodies lost their high lateral speed, the shock of the chute opening would snap their nocks and break their shrouds. They had 2000 an less ft. in which to balance these two factors at a speed of 240 or more miles per hour. Considering the above, and the report of Dumbo who was at 1000 ft. when he dropped the raft, I don't believe there were any other survivors. I write this dissertation for the benefit of others who may have to make the hard decision of breaking off the search.

— page 176 —
29 April 1945 (Cont'd)
2203 Plane contact 4 miles, Submerged.
2246 Surfaced. Bright moon, "rat calm.

: 30 April 1945
12001 Position
Lat. - 51-18N
Long. - 151-36,SE

0042 Received message from ConsubPac telling of additional survi-
vors off Toi Misaki.
0101 Aircraft at 6 miles, Submerged.
0144 Surfaced. These planes get our approximate location from
their radar then get us Lween them and the moon and come
in. I have been followin' the moon's wake and to date have
received no bombs at nfgi...
0324 Plane at 6 miles, range 3'c

— page 177 —
30 April 1945 (Cont'd)
Searched accordingly and found not a thing. Attempted to contact Dumbos, no luck. Upon conference with these survivors the following came out: They started parachuting at 13,000 ft. plane speed 250. Last chute went out at 9,000 ft. We had four from the nose, including pilot and bombardier. We had two from the center section. Pilot believes navigator's clute did not open, and that tall gunner did not jump. Co-pilot was a highly nervous type and may not have pulled chute or may have been dragged under. The radar operator and the central fire control man who dropped first were cool and could possibly have headed for the beach. A marine diesel engine was heard during the night and the others believe these two could have also been picked up by a Jap patrol boat. They were not in this area.
1910 Surfaced and opened out. Attempted to inform ComSubPac. We were in a complete radio blind spot and could raise no one. Opened out to get clear. SD radar out of commission.

May 1945

12001 Position
Lat. - 31-41.3N
Long. - 131-45E

0055 Succeeded in transmitting survivor report to ComSubPac.
Base Radio Station of Commander Utility Wing relayed it for us. This is the first time I have seen the phenomena of a complex radio transmitting black-out.
0432 Submerged to head for the hundred fathom curve. Will search all probable points of any aviators we may have missed from the plane crash of the 29th.
0939 Surfaced with 10d Missak bearing 258, distant 12 miles. Seas are state four, wind force 5 from south. It's bad weather for one-man life rafts. Headed up along the hundred fathom curve which covers the current path quite accurately, also the path of owned aviators.
1150 We have searched along the curve for 15 miles and have looked into 80 fathoms to give 8 miles lateral coverage for the best estimated position. Nothing shows up. Pilot and myself are satisfied that the six we have recovered are the only ones around.
Submerged to start a fuel economy program. We have used half our fuel lifeguarding.
These planes that crashed were badly hit over the target and just made it to sea. Lt. Fisher evidently was the only one of the three pilots to make the correct estimate and get his people out. He was the last of those who left the ship. Since receiving the report on the Nachi mine chart, I don't feel justified in going deep across the hundred fathom curve. It is an exasperating block that I can't see to get around. For the present I'll confine my patrol to Okino Shima.
1940 Surfaced. Headed for Bu. J.

— page 178 —
2 May 1945
1200I Position
Lat. - 32-39.71N
Long. - 132-09.33W

0426 Submerged to patrol in "term half of Juno Suido.
1954 Surface.
2232 Friendly radar interference bearing 125°T. Probably the ATULE.

: 4 May 1945
1200I Position
Lat. - 32-36.2N
Long. - 132-04E

0040 SJ contact and friendly radar flashes 165°T, 11,000 yards.
Exchanged recognition signals with ATULE.
0240 ATULE now 7,000 yds., 11°T from us. Opened to west.
0451 Submerged to patrol in western half of Juno Suido.
2001 Surface.
2352 Plane on SD at 17 miles. Opened.
2347 Planes on SD at 7 & 12 miles. Closed to 4 miles. Submerged
These may be our own, but they show no IPF.

4 May 1945
1200I Position
Lat. - 32-33.2N
Long. - 132-08.2E

0025 More planes on SD at 2 miles.
0050 Surface.
0055 Planes at 4, 12 and 14 miles. These are probably curs, but
they show no IPF.
0102 One plane coming in. Colored the bridge and tried to estab-
lish IPF.
0103 No success. I can hear his engines and whether curs or Jap;
submerged with plane overhead. I'll wait until this raid is
over. held conference with our aviators to find if they
could distinguish between two sound of a B-29 and a Jap.
Decided that this would be too uncertain.
0305 Surface. Rafe is over.
0425 Submerged to patrol in western half of Juno Suido.
2001 Surface.
2022 ATULE bearing 165°T, 11,800 yds.

5 May 1945
1200I Position
Lat. - 32-37.6N
Long. - 132-03.5E

— page 180 —
1952 Surfaced.
9 May 1945
12001 Position
Lat. - 32°-4119N
Long. - 132°-0312E
0419 Submerged to patrol in Bungo Suido. State 2 sea.
2007 Surfaced.
10 May 1945
12001 Position
Lat. - 32°-401N
Long. - 132°-1115E
0415 Submerged to patrol in Bungo Suido. State 3 sea.
2000 Surfaced.
11 May 1945
12001 Position
Lat. - 32°-381N
Long. - 132°-1514E
0240 Exchange calls with U.S.S. ATULE by SJ radar. We will exchange sides of Bungo Suido the 14th.
0405 Submerged. State 2 sea.
1600 Distant explosions. Flamed up to thirty feet to make SJ sweep. No contacts.
1952 Surfaced.
12 May 1945
12001 Position
Lat. - 32°-4112N
Long. - 132°-1216E
0404 Submerged. State 2 sea.
2002 Surfaced.
2116 Planes are dropping flares over Kyushu, then bombing. This continued intermittently thruout the night.
13 May 1945
12001 Position
Lat. - 32°-4215N
Long. - 132°-1315E

— page 181 —
13 May 1945 (Cont'd)
Our carrier planes are hitting southern Kyushu today. If the Jap comes out, he'll probably be in an anti-aircraft disposition. The only waters large enough to support that type of sortie is the center channel. Therefor will patrol accordingly. This will also give us good coverage across the entire entrance.

0558 Submerged. State 3 sea.
1250 For the past twelve days we have been doing our best to remain undetected and at the same time cover the most probable sortie route of the remaining Jap fleet. This has entailed sixteen-hour dr.'ly drives which invariably covered a line west of Okino Shima across the entrance to Bungo. It was with a feeling of the man who held next to the winning lottery ticket that I watched a flight of some three hundred PGP's, TSP's and dive bombers come sauntering out over Bungo on course 1500'. It is obvious that they have been up to no good in the Inland Sea and that GAIO's chances for a crack at the remaining Mip Fleet are fast going by the board. "I'll fight grade or good humor, raised the SD mast and set a watch on the life guard free-guard. Perhaps we can salvage something from this situation in the form of new members for the Coding Board. Sea flat, visibility good, no downed eviators in sight.

2005 Surface. Heavy day interference on the life guard free-guard.

2225 Plane at two miles, no IFR. Submerged.
2250 Surface. Own planes around tonight. We are not diving for them unless they indicate Jap radar on the APR.

14 May 1945

12001 Position
Lat. - 38-42N
Long. - 150-15E

0001 Several planes at 15 miles. Friendly IFR.
0006 Plane overhead, friendly IFR.
0015 Radio flashes to the north.
0022 Planes passing overhead.
0026 Planes at 4 miles on S.J.
0027 Plane at 11 miles.
0011 Plane passing overhead.
0155 Plane at 6 miles.
0240 S.J. toJ. flare over a Kyushu airfield.
0313 on S.J. 3 miles. Unfriendly radar. Submerged.
0356 Surface.
0569 Plane at 10 miles on S.J.
0417 Submerged to resume patrol west of Okino Shima. State 1 sea.

0752 Submerged 2 single engined planes.

— page 182 —
14 May 1945 (Cont'd)
: 1955 Surfaced.
: 16 Mar. 1945
: 12001 Position
: Lat. - 32-42.2N
: Long. - 132-40.0E
: 0405 Submerged to patrol in Bungo Suido.
: 0202 Surfaced.
: 16 Jan. 1945
: 12001 Position
: Lat. - 32-42.2N
: Long. - 132-40.0E
: 0402 Submerged to patrol in bungo suido.
: 2008 Surfaced.
: 17 Jan. 1945
: 12001 Position
: Lat. - 32-42.2N
: Long. - 132-07.9E
: 0205 Plane contact on SJ, 10 miles.
: 0105 Friendly IFF at 4 miles.
: 0359 Submerged.
: 1959 Surfaced.
: 2005 Received message from ComSubPac directing us to depart
: station on the evening of the eighteenth, proceed to Saipan
: and then on to Pearl.

: 18 Jan. 1945
: 12001 Position
: Lat. - 32-39.9N
: Long. - 132-07.9E
: 0404 Submerged to patrol in Bungo Suido.
: 1957 Friendly SJ radar interference bearing 100°T. Cannot contact, but it is probably 100°.
: 2002 Surfaced on course 135°T. Put 4 engines on propulsion to
: get clear of 100°.
: 2041 Passed Okino Shima abeam to port, 18 miles distant. The
: night is exceptionally clear, sea calm.
: 2223 Excavated recognition signals and calls with U.S.S. A.C.K.
: 2350 Strong AFI signals, Jap plane radar.

— page 183 —
19 May 1945

12001 Position
Lat. - 30°-23.0'N
Long. - 135°-25.8'E

0010 Plane headed for us,' distant 3 miles, submerged.
0050 Surfaced.
0145 Our plane is back.
0204 Plane closing, distant 3 miles. Submerged. The moon is still bright.
0246 Surfaced.
0320 Plane returned once more. Commenced surface evasion.
0405 After unsuccessfully trying to box us in, plane gave up and headed home. Returned to four engine speed.
1500 Submerged.
1507 Surfaced. Returned to four engine speed.
2206 Sent GATO Serial one to CTG 17.7.

: 20 May 1945

12001 Position
Lat. - 25°-56'N
Long. - 137°11'E

0939 Plane on SJ, 10000 yards. No IFF on SD.
0940 Plane closed to 7,000 yards. Submerged.
1001 Surfaced. Resumed four engine speed.

21 May 1945

12001 Position
Lat. - 19°-15'7"N
Long. - 137°-20'2"

2139 Sent GATO Serial two to CTG 17.7. Sighted various friendly planes. No mention of them will be made unless they effect GATO operations.

22 May 1945

12001 Position
Lat. - 15°-32'N
Long. - 141°-22'E

23 May 1945

12001 Position
Lat. - 15°-12'2h)
Long. - 145°-40'53) Saipan 15.

— page 184 —
23 May 1945 (Cont'd):

0050 Unidentified radar contact on SJ at 31,000 yards. Believed to be a very large ship.
0059 Submerged for trim.
0204 Surfaced. Resumed four engine speed: 0344 SJ radar contact on our escort, PG-1062; at 17,000 yards. Exchanged recognition signals.
0351 Set course for Tanapag Harbor, Saipan Is.
0753 Record alongside U.S.S. ORION in Tanapag Harbor, Saipan. Set all clocks ahead one hour to King (-10 zone). Time. Fueled ship and supplemented our provisions with fresh. Received two enlisted passengers on board from SubDiv-162 Relief Crew. Transferred one CIG to for treatment of infected foot and received on board one Stihl replacement.

24 May 1945

1200K Position
Lat. - 15-20°N
Long. - 145°-21°E

1000 Underway for Pearl Harbor, HI., in accordance with CTG 17. Operation Memorandum, dated 25 May 1945, in company with U.S.S. LCI-1089 as escort.
1440 Released escort.
1520 Exchanged recognition signals with U.S.S. STEELHEAD.

25 May 1945

1200K Position
Lat. - 17°-07'17"N
Long. - 146°-42'15"E

0923 Exchanged recognition signals with U.S.S. PETO.
2225 Exchanged recognition signals with U.S.S. LOGGERHEAD in company with U.S.S. PADDLE.

26 May 1945

1200K Position
Lat. - 18°23'17"N
Long. - 154°-05'17"E

0701 Exchanged recognition signals with U.S.S. HADDO.
0713 Commenced acting as target for a sound approach by U.S.S. HADDO at her request to check her sound gear.
0826 Sighted friendly submarine on horizon. Unable to exchange recognition signals. Believe it to be either the U.S.S. SEA DEVIL or the U.S.S. RONQUIL.

— page 185 —
27 May 1945

1200L Position
Lat. - 19°-2315N
Long. - 159°-171°E

0654 Submerged for trim.
0955 Surfaced.
1000 Set all clocks ahead one hour to -11 zone time.
1400 Exercised tracking party.

: 28 May 1945

1200L Position
Lat. - 20°-231N
Long. - 164°-291E

1243 Submerged. Commenced battery test discharge at the 6 hour rate.
1600 Exercised tracking party.
1905 Completed battery test discharge, Surfaced.

: 29 May 1945

1200L Position
Lat. - 20°-5915N
Long. - 168°-5313E

1301 Submerged for training dive.
1319 Surfaced.
1600 Exercised tracking party.

: 30 May 1945

1200M Position
Lat. - 20°-5815N
Long. - 174°-2115E

0050 Exchanged recognition of mails with U.S.S. LAPOII.
0200 Set all clocks ahead c.c. hour to hike (-12 zone) time.
1600 Exercised tracking party.
1720 Sighted friendly merchant vessel bearing 060°T, 25,350 yards. Maneuvered to keep well clear, exercising tracking party.

: 31-30 May 1945

1200L Position
Lat. - 20°-5517N
Long. - 179°-1814W

0930 Crossed International Date Line. Changed date to 30 May 1945.

— page 186 —
31 May 1945 (Cont'd):
0951 Exchanged recognition signals with U.S.S. CARBONERO.
1557 Conducted rubber boat launching drill, putting our Goodyear over the side.
1600 Conducted shiphandling drill with all officers making an approach on the rubber boat.

31 May 1945
1200N Position
Lat. - 20°-58'11N
Long. - 173°-27'W

1540 Signed a liferaft bearing 350°T. Upon investigation, found it empty.
1728 Swumered for trim.
1805 Surfaced.
2030 Set clocks ahead to Kan (+11 zone) time.

1 June 1945
1200N Position
Lat. - 20°-58'11N
Long. - 173°-27'W

0116 Received ConsubPac4Comd Deepchat ordering rendezvous with SILVERSIDES to receive an appendicitis case. Changed speed to 4 engines speed.
0956 Had rendezvous with SILVERSIDES and received the following named man on board: SHIH, Rose A., Bk3c, 37G 70 35, USII.
143C Received ConsubPac4Comd message covering rendezvous with U.S.S. V.M.10 (A463) to effect transfer of our recently acquired privates to the same case. Changed course toward rendezvous position at four engine speed.
1357 Contacted T.S.S. VIMON on 3J Radar, range 29,000 yards.
Commanded tracking.
2045 Transferred appendicitis case to VIMON and received in exchange five gallons of 1% cream.
2910 Sent message reporting "m.sfer anr requesting Pearl rendezvous.
2245 Entered Joint Zone and set course for Pearl rendezvous position at 4 engine speed.

2 June 1945
1200N Position
Lat. - 20°-46'11N
Long. - 163°-51'11W

2044 Radar contact on friendly convoy. Exercised tracking party.
2325 Radar contact on second friendly convoy. Exercised tracking party.

— page 187 —
3 June 1945

0530 Set clocks ahead one and one half hours to +9° zone time.
0700 Contacted and made rendezvous with escort, FC-463.
1030 Located & U.S. Submarine Base, Pearl Harbor, T.l.

3 June 1945

0530 Set clocks ahead one and one half hours to +9° zone time.
0700 Contacted and made rendezvous with escort, FC-463.
1030 Located & U.S. Submarine Base, Pearl Harbor, T.l.

— page 188 —
0

(C) WEATHER:
The weather in the vicinity of Bungo Suido from the period of 18 April to 18 May corresponded closely with the Coastal Pilot, generally fair with wind and sea varying from flat calms to state 5 to 4. During the period, 18 to 22 April, a smokey haze reduced visibility to less than eight thousand yards.

(D) TIDAL INFORMATION:
Currents encountered off the South coast of Shikoku agreed generally with data found on the charts of the area, Pilot Chart, and Current Chart. 20 to 30 miles southeast of Ashizuri Saki, currents of 2 to 2.5 knots setting 0600 were experienced.
In Bungo Suido, currents were tidal varying from 0 to 1 knot, setting 0300 and 1600.

(E) NAVIGATIONAL AIDS:
No navigational aids were sighted.

(F) SHIP CONTACTS:
None.

(G) AIRCRAFT CONTACTS:
Aircraft contacts were numerous. The enemy succeeded in forcing us down during many of the bright moonlight nights. Usually he would obtain our approximate location from his radar and then would maneuver to put us between himself and the room for an up-moon attack. Our counter was so slow down, trim down, and head directly for the moon, making ourselves as visually inconspicuous as possible. At no time during these many nights contacts did they attempt bombing or strafing.
Friendly planes embarrassed us by not having their IFF turned on. Our gun fight with the float Zero was the direct result of one covering Dunko not having his IFF energized.
The day tactics of the float Zero were to come in at about 2500 feet altitude astern of our covering Dumboro. At a position angle of about 60 degrees he nosed over for a glide bombing attack, coming in on our beam.
Our counter was high speed and a ready gun battery. I believe we would have suffered serious damage had we attempted to dive with the plane at such close range. If the same conditions again arise, the plane will be met by 5-inch fire in addition to 40 and 20 millimeter. The pointer and trainer only will man this five inch gun. Then the plane noses over, presenting a zero deflection shot, the pointer will pass over, pointer loads another round while trainer follows the target. I believe this stated will be effective against a single plane glide bombing attack.

— page 190 —
35.25 cal. gun was found far superior to any yet placed on submarines and it is regretted that no targets were found. It is suggested that a slewing gear be placed in the training mechanism. It is recommended that a slow-moving gear be placed in the training mechanism.

(L) RADIO:
Radio operation was satisfactory at all times. For the most part, we received about 90-90 Kcs. or 9050 Kcs. As directed, a log showing the time and date-time and signal strength is being forwarded to ComSubFACOM. A few times SubFACOM was received during the 3D radar mast. No ComSubFACOM was received during the 3D radar mast.

The radio station, on great difficulty was experienced in our general station. On 3rd Oct 1955 Zebra we tried to send a message 235, 376, 376, 1944 at 355 Kcs, an enemy, although we tried and she had a 355 Kcs,

— page 191 —
1. RADIO (Cont'd):
authentication, most messages to us did not carry an authentication and at times our request for same was unheeded, although other factor satisfied us as to the friendly nature of the transmission. It is suggested that the shackle system of authentication be used for all life-guard voice transmissions, instead of alternating shackle with the aircraft code (CSP1270) as at present. It is also suggested that traffic on both 4475 Kcs. and VHF be kept to a minimum in view of the ever-present possibility of missing a ditching message due to other less important or overly long transmissions.

Our only radio casualty was a broken turnbuckle on the starboard antenna, caused either by the near bomb misses or the subsequent dive. The antenna was retrieved and restrung upon surfacing.

: 2. RADAR:
The SJ-4 was manned continuously while on the surface, using intermittent keying during most of the time and avoiding certain areas likely to contain radar receivers capable of picking up 10 Ci transmissions. In the latter instances the SJ was used to sweep the danger area. Very good ranges were obtained, including aircraft, up to 15,000 yards, friendly DJs up to 15,000 yards and friendly SS cover 2,000 yards (in one very exceptional case 16,500 yards). Land 5,600 not high was obtained to the end of the main sweep. Furthermore we had many troublesome second sweep echoes from the Japanese mountains. In addition to routine tube and other replacements, the following troubles arose:

1. Trouble - SJ-4 training mechanism ceased to operate. Cause - Hall cases and other foreign material lodged in superstructure between Freeze and rotating mast. The SJ was used for surface search during an entire night until daylight permitted removal of the trouble some material.

2. Trouble - Repeated blowing of Fuses 9 and 10 with high H.V. Outfitter current and low H.V. Rectifier voltage. Cause - Bad On Time

3. Trouble - Jitter in SJ pulse (but not 3Z) and loss of pulse or brief intervals. Cause - Bad Iodulator tube, V-9, 5D21, in Transmitter after 273 hours of service.

4. Trouble - Repeated blowing of Fuses 1 and 2 and of tube 5U4G

5. Trouble - Short from +300V through probe of Boating Oscillator tube, J-2, 7265, to the grounded outer conductor of coaxial line. Fault was not in the tube but in worn alignment of plumbing.

6. Trouble - No lobe switching and no training. Cause - Two near-misses by aerial bombs which both and shorted the collector rings and jammed the shaft from the feeder assembly to the bearing indicator transmitter.

The SD-3 was operated to and from the area, during life-guard duty, and when possible enemy aircraft radars were picked up on the radar detector. The SD radar was kept in a standby condition while on the surface and, when used, was keyed for a very brief interval every minute. Ranges on aircraft ran up to 25 miles. The following

— page 192 —
1. Trouble - No power to Receiver-Indicator; fuse blown. Cause - Shorted condenser C-255, Navy Type Number CAV 4E1275 after 2516 hours of service. This short alsc burned out transformer T-202, Navy Type Number CRV 50736, after the same period of service.

2. Trouble - No trace on scope of Receiver Indicator; no power to cathode ray tube circuits. Cause - Condenser C-255 again shorted out after only 102 hours service. In the absence of further SD spares, we replaced it with a similar condenser from SJ spares and no further troubles arose. The SD spare condenser was evidently faulty.

The SJ was identified in a standby condition whenever the SJ was in use. It is also observed that the SJ was not in use for more than 10,500 yards while at 4,000 yards. The SJ was not in use for more than 10,500 yards while at 4,000

— page 193 —
1. STYLUS would not fly-back in one instance and would not start
   tract at correct place in second. Cause - Two broken return springs
   on guide bars, part number 803761, after 172 and 226 hours of service.
   . 2. STYLUS would not synchronize with head rotation. Cause - Bad
   fly-back switch, part number 800, on head, after 80 hours of serv-
   vice.

: (0) DENSITY LAYERS:
   - Definite negative temperature gradients were found in the Bungo
   Suido area every day. They were never over 4°, but the depth and
   amount of the gradient would vary in less than 15 minutes, indicating
   decided underwater currents. PI cards will be forwarded to the hydro-
   graphic office.

: (P) HEALTH, FOOD, AND HABITABILITY:
   - Health throughout the patrol was excellent. There were no sick
   days.
   - Variety, quality, and preparation of food was adequate and by
   next patrol will be excellent.
   - Habitability was very good in spite of the necessarily long dives
   and ten passengers.

: (Q) PERSONNEL:
   - (a) No. of men detached after previous patrol 14
   (b) No. of men on board during patrol 76
   (c) No. of men qualified at start of patrol 44
   (d) No. of men qualified at end of patrol 76
   (e) No. of unqualified men making their first patrol 11
   - Performance of officers and enlisted personnel was of the highest
   order. The enthusiasm, willingness, coolness and ability of the ex-
   perienced personnel earned my complete confidence and respect. The
   earnestness of the new personnel made their training a pleasure.

: (R) KILOS STEADED - FUEL USED:
   - Guan to area 1885 miles 27702 Gals.
   In area 3612 miles 37140 Gals.
   Area to Saipan 1605 miles 52125 Gals.
   Saipan to Pearl 3419 miles 57000 Gals.

: (S) DURATION:
   - Days. enroute to area 7
   Days in area 30
   Days enroute to Saipan 5
   Days enroute Saipan to Pearl 12
   Days submerged 23

— page 194 —
1. Ship - U.S.S. GATO.
2. Position when enemy radio signals were observed. Latitude 31° to 32° North, Longitude 131° to 132° East.
3. Position of Transmitting Station - Unknown.
4. Dates of jamming:
    - 21 to 22 April 1945 from 2100 to 0130 GCT
    - 26 to 27 April 1945 from 2300 to 0430 GCT
    - 13 May 1945 from 1100 to 1900 GCT
5. Frequencies jammed - 4475 Kcs.
6. Deseribe signal jammed - voice and CV.
7. Use of circuit - Submarine - Dunbo air-sea rescue.
8. Was enemy jamming stable - yes.
9. What was ratio of strength of own signal to enemy jamming signal - varied, but approximately 2 to 1, although at times enemy signal had strength of 5/3.
10. Output of own transmitter at time of jamming - 200 watts.
11. Location of enemy jammer - unknown but believed landbased.
12. Type of jamming signals - CV, seemed to be random keying, although some might be messages.
13. Effectiveness of jamming - Not effective enough to cause material delay in traffic. An occasional message had to be repeated.
14. Action taken to overcome jamming - tuned receivers, but with no effect.
15. Band-width covered by enemy jamming signals - about 10 Kcs.
16. Did jamming transmitter appear - o be monitored by a look-in receiver - Possibly.
17. If frequency was shifted, how long before enemy jammed new frequency - could not shift frequency.
18. Narrative - The jamming CV signals usually started just a short time before we received our first transmission from the Dunbo planes. Evidently the enemy picked them up a little before we did.

— page 195 —
4/16/45
Loc: 1st Lt. L. C. 51-12N, 125-45E
Frequency: LOS
P.R.P. Per sec. 41
Pulse Width 50
Sketch Pulse 20-25

TOTAL: 135004
TOTAL: Believed to be - British shipborne.
4/16 to 5/1/45

31/1/45: 157 500 8-10
Ned detached out to:
31/1/45: 13-15
Ned: 13-15
NED: 13-15
N

— page 196 —
4/22 to 5/10/45

Location: N.Lat.Blong
All areas near Bungo Suido and Toi Misaki.
NOTE: Definitely airborne surface search, followed by SD and SJ radar contacts. Has lobe switching and/or antenna switching. In latter case pulse would jump violently from very weak or none to very strong. Frequently two planes worked together. (These contacts required a close watch on the frequencies involved and materially limited other radar countermeasure data.)

32°22' 132°00' 212 800 9
NOTE: Also airborne surface search followed by SJ contact. Had antenna switching. Both type of equal size (but they must work satisfactorily as ne made us dive), 9 hcs each. (Only other aircraft frequency.)

31°05' 134°05' 150 800 15
NOTE: Landbased - directional believed air search.

South of Bungo
Suido to 31°35'
also at
32°27' 133°30'
NOTE: Probably landbased surface search. Possibly near Toi Misaki on Okino Shima. Evidence of lobbing in one instance. Directional. Well-formed sharp pulse.

Entire area around 100-102 450-500 15-20
Bungo Suido.
NOTE: Probably landbased aircraft search. Irregular slow training.

31°13' 132°52' 148 450 9-11
31°25' 132°10'
NOTE: Probably landbased - slow training.

— page 198 —
0

(V) REMARKS:

For life-guard duties I believe it should be impressed on the covering planes that their primary mission is to locate survivors and then direct the submarine to them. Their services as fighters are required only when the submarine is actually picking up personnel.

On the 29th of April our covering plane acted primarily as a fighter cover. As a result we passed between two groups of survivors, each distant from us about fifteen miles. Each group heard our gunfire, yet our covering plane did not see them because it was at an approximate altitude of three thousand feet, acting as an Anti-aircraft ship. The sea was flat calm. Subsequent rescues were executed eight and twenty-four hours later without benefit of air coverage.

It is recommended that photos of the track and trawl reproductions be included in the Area Digests. I believe that this would be of great assistance to the Commanding Officers in determining their hunting points.

Unfortunately the Japs did not choose our patrol period nor our patrol station to effect a sortie of their major naval units. I am sorry, for we have fine tools of attack, and opportunities for their employment are fast disappearing.

— page 199 —
1-103/A16-3
Serial: 041
C-O-N-F-I-D-E-N-T-I-A-L
FIRST ENDORSEMENT TO
U.S.S. GATO (SSE12)
Report of Twelfth War Patrol.

From: The Commander Submarine Division ONE HUNDRED THREE.
To: The Commander 4th Chief, United States Fleet.
Via: (1) The Commander Submarine Squadron TEN.
(2) The Commander Submarine Force, Pacific Fleet,
(3) Administration.
(4) The Commander in Chief, U.S. Pacific Fleet.

Subject: U.S.S. GATO (SSE12) - Report of TWELFTH War Patrol.

1. The twelfth war patrol of the GATO was the first for Lieutenant Commander R. Holden as Commanding Officer and was conducted in the BUNGO SUIDO area. It was of fifty-three days duration, thirty of which were spent submerged.

2. There were no ship contacts but while on life guard station, by intelligent planning and searching, ten aviators were rescued on three separate occasions. Three on 27 April, one on 29 April and six on 30 April. These aviators will now be able to carry more destruction to the Jap homeland.

3. The commanding officer's intelligent use of the TDM probably saved his ship on the nights of 22 and 23 April.

4. Although not included in the patrol report the Commanding Officer recommends that submarines assigned life guard station be issued additional blood plasma. It is therefore recommended that submarines departing on life guard missions be issued a double supply of blood plasma.

5. Communication via the ST Radar while submerged is noted.

6. The GATO returned from patrol in excellent material condition and above average in cleanliness. Refit will be accomplished in the normal time by Submarine Division One Hundred Three Relief Crew and the Submarine Base.

7. The Division Commander congratulates the Commanding Officer, officers and crew of the U.S.S. GATO upon completion of this arduous patrol.

W.H. BROOKMAN, JR.

— page 200 —
FC5-10/A16-3
Serial:  100
5 June 1945.

CONFIDENTIAL
SECOND ENDORSEMENT to
USS GATO (SS212) - Report of Twelfth War
Patrol.

From: The Commander Submarine Squadron TEN.
To: The Commander-in-Chief, UNITED STATES FLEET.
Via: (1) The Commander Submarine Force, PACIFIC FLEET, Administration.
(2) The Commander-in-Chief, U.S. PACIFIC FLEET.

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

1. Forwarded, concurring in the remarks of the Commander Submarine Division ONE HUNDRED THREE.

2. The achievement of the GATO in the rescuing of ten aviators under trying circumstances and close to the enemy shores, is to be particularly commended.

3. The Squadron Commander takes pleasure in congratulating the Commanding Officer, officers and the crew of the U.S.S. GATO upon the completion of that vessels Twelfth War Patrol.

G.P. PITTMON
G.I. PITTMON.

— page 201 —
15 June 1945
NOTE: THIS REPORT WILL BE DESTROYED PRIOR TO ENTERING PATROL AREA.

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

Subject: U.S.S. GAATO (SS212) - Report of Twelfth War Patrol (12 April to 3 June 1945).

1. The twelfth war patrol of the GAATO, under the command of Lieutenant Commander R. Holden, U.S. Navy, was conducted in the vicinity of Bungo Sudo. In addition to offensive patrol the GAATO was employed for lifesupport services.

2. During this long arduous patrol near coverage was good, and the GAATO had the pleasure of reassuring the enemy, and maintaining a submarine activity were responsible for those reasons. Except in unusual circumstances, submarines should not engage in gun battles with aircraft. The lack of air-destroyer fire power and the vulnerability to damage by bombing, strafing, and scuttling attacks outweigh the damage that may be done to the enemy.

3. Award of Submarine Combat Insignia is authorized for this patrol.

4. The Commander Submarine Force, Pacific Fleet, congratulates the commanding officer, officers, and crew of the GAATO on the completion of this twelfth combat patrol; and hopes that suitable targets will be available to them in the future patrols.

E. E. YOUNG.

DISTRIBUTION:
(Complete Reports)
Cominch (7)
CDR (5)
Consubspac(4)
DIC(6)
SUSAD, MI (2)
JICPDA (1)
ConsubspacSubordcon (3)
ACLIPODA (1)
All Squadron and Div. (2)
Conservapc (1)
Consubten (2)
Substrep (2)
S/M School, ML (2)
All Submarines, Pacific (1)
CO, S/M Base, PH (1)
Consopac (2)
Consowspac (1)
Consubsp?thift (Fwd Echelon) (2)
Consubsp?thift (Rear Echelon) (2)
Consorpa (1)
Consubspac (3)

W. S. LANGLEY,
J. S. L

— page 202 —
12 September 1945
SS212/A16-3
Serial: 04-46
c/o Fleet Post Office
San Francisco, California

CODECASSIFIED

From: Commanding Officer, U.S.S. GATO.
To: Commander in Chief, United States Fleet.
Via: (1) Commander Submarine Division - 103.
(2) Commander Submarine Squadron - 10.
(3) Commander Submarine Force, Pacific Fleet.

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

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

1. Enclosures (A), covering the thirteenth war patrol of this vessel, conducted in areas off the eastern coast of Honshu during the period 6 July, 1945 to 12 September 1945, is forwarded herewith.

R. HOLDEN

DECLASSIFIED
DECLASSIFIED-ART. 0445, OPMANIST SS10.C
BY OP-0932C DATE 5/26/42

142359

— page 203 —
1. Installed 40mm gun on forward cigarette deck replacing single 20mm.
2. Installed twin 20mm on main deck forward replacing single 20mm.
3. Removed all torpedo tubes shutters, built up and recut roller paths. Overhauled operating levers.
4. Installed spindle-type firing valves.
5. Modified stop rod, 40, 7 torpedo tube, for silent firing.
6. Renewed both propellors.
7. Rewooded strut bearings.
8. Installed additional 40mm Type DRT in control room.
9. Overhauled No. 3 and No. 4 main engines and the auxiliary engine.
10. Installed JA sound powered telephone outlet at gyro indicator.
11. Installed depth charge direction indicator.
12. Installed dome over QB sound head.
13. Installed JP intercommunication system.
14. Installed SD-5 radar.
15. Installed AP-5A radar.
16. Installed cable trunk and spare hull stuffing tubes between conning tower and control room.

Lieutenant M. A. ELLIS, (E)L(T), USNR, radar officer, was detached and Lieutenant (jg) J. R. SCHAACHER, E(T), USNR, reported on board for duty. Gunner C. H. TATE, USN, accepted appointment as Warrant Gunner and reported to the commanding officer for duty.

On 25 June, 1945, conducted post repair trials and cavitation tests. Excessive noise was discovered in the port shaft and an extension of the refit was granted in order to correct it. On 30 June, 1945, conducted remainder of post repair trials, deep dive and sound tests. On 1 July, 1945 commenced a five day training period with the Commander Submarines Division One hundred Three, Captain W. H. BROOMAN, Jr., U.S. Navy, as training officer. Eight exercise torpedoes were fired by the GATO at escorted targets. Loaded six Mark 14 torpedoes. Ready for sea 8 July 1945.

— page 204 —
7

CONFIDENTIAL

(B) NARRATIVE.

Officers and CPO's on board

Lieutenant Commander R. HOLDEN, U.S.N.
Lieutenant L. V. YOUNG, U.S.N.
Lieutenant J. L. CONNOLLY, DE, U.S.N.R.
Lieutenant W. W. GRAHAM, DE, U.S.N.R.
Lieutenant H. B. FISH, U.S.N.
Lieutenant (jg) J. R. SCHUMACHER E(T), U.S.N.R.
Lieutenant (jg) H. O. GILL, U.S.N.
Rnsign J. A. O'BRIEN, U.S.N.R.
Rnsign L. W. GREEN, (D)L, U.S.N.R.
Rnsign L. D. BORN, (D)L, U.S.N.R.
Gunner C. E. TATE, U.S.N.

GALLAGHER, D. R., CPN(T), U.S.N.
GREENLEAF, R. L., CHOLM(AA)(T), U.S.N.R.
ROTH, R. B., CRT(AA)(T), U.S.N.R.
SAPLES, C. T., CEM(AA)(T), U.S.N.R.
SAWYER, G. R., CHOLM(AA)(T), U.S.N.R.

8 July 1945

1330(W) Underway for Tanapag Harbor, Saipan, in accordance with Consubpacedcomm Oponder #134-A-45 of 7 July 1945 in company with U.S.S. PC 602 as escort. Started school of the boat.

1610(W) Made trim dive.
2016(W) Released escort.

9 July 1945

1200N Position
Lat. - 21-05N
Long. - 163-06W

0630 Set clocks to Oboe (+10 zone) time.
0650 Exchanged recognition signals and calls with U.S.S. PIRANHA.
0900 Set clocks to Nan (+11 zone) time.
1311 Made training dive.
1408 Exercised tracking party.

10 July 1945

1200 N Position
Lat. - 20-56N
Long. - 169-00W

1535 Exercised at Battle Stations Gun. Test-fired 5" gun.
1545 Exercised tracking party.
1821 Made training dive.

-2-

— page 205 —
1200M Position
Lat. - 21-25N
Long. - 174-45W

0825 SJ radar contact 278°T, distant 1,900 yards. Submerged.
Contact unidentified.
0846 Surfaced.
0900 Set clocks to Mike (+12 zone) time.
0915 Exercised aircraft rescue party.
1535 Exercised tracking party.

12-13 July 1945

1200M Position
Lat. - 21-24N
Long. - 179-34E

0758 Made training dive.
1010 Crossed 180th meridian. Changed date to 15 July 1945 and
zone description to -12.
1400 Exercised aircraft rescue party.
1440 Exercised boarding party.
1545 Exercised tracking party.
2338 Received Consubpac Serial 76 designating GATO for life-
guard duty at Wake Island.

14 July 1945

1200M Position
Lat. - 21-23N
Long. - 175-25E

1543 Exercised tracking party.

15 July 1945

1200M Position
Lat. - 21-32N
Long. - 169-34E

1540 Exercised tracking party.
1541 Took departure from assigned route to head for Wake Island.

16 July 1945

1200M Position
Lat. - 19-15N
Long. - 166-30E

— page 207 —
21 July 1945
1200K Position
Lat. - 18-26'N
Long. - 151-34'E

0822 Passed two submarines probably SPOT and SEA OWL.
1117 Made trim dive.
1139 Surfaced.
1450 Exercised at Battle Stations Gun.
1607 Exercised tracking party.
2038 Exchanged calls via SJ with U.S.S. PERCH.

22 July 1945
1200K Position
Lat. - 17-46'N
Long. - 146-41'E

1515 Exchanged recognition signals and calls with U.S.S.
HARSH (DR699).
1610 Exercised tracking party.

23 July 1945
1200K Position
Lat. - 15-19'N
Long. - 145-22'E

1000 Underway enroute patrol area in accordance with CTP 17 operation order No. 169-45.
1454 Dismissed escort.
1519 Made trim dive.
1907 Signed B-29 circling low over the water. Put on 4 engines and headed for him. Upon establishing communications, was informed he had been sent out to look for a survivor 35 miles west of Alamagan, but did not have him in sight after one hour's search. Inasmuch as he was west of Anatahan, decided to head on up.
2135 Exchanged calls with U.S.S. FARGO. He had just come thru the reported position. Decided to break off the search. There is not enough positive information and I can't waste fuel on goose-chasing.

— page 208 —
1200K Position
Lat. - 18-42'3N
Long. - 142-19'5E

0825 Exchanged calls with U.S.S. SPRINGER.
1719 Sighted U.S.S. THREADFIN.
1804 Received much-needed 7 megohm resistor via line-throwing gun from THREADFIN.

27 July 1945

1200K Position
Lat. - 23-01'N
Long. - 139-42'E

0410 Exchanged calls with U.S.S. DENTUDA.
1430 Made trim dive.
1500 Set clocks to Item (-9 zone) time.
1600 Held tracking drill.

28 July 1945

1200K Position
Lat. - 27-49'5N
Long. - 139-41'E

035F Passed two friendly surface ships with escorts.
035G Passed friendly tanker and cargo ship with two escorts.
1610 Exercised at tracking drill.

29 July 1945

1200K Position
Lat. - 31-44'N
Long. - 140-30'E

1605 Exercised at tracking drill.

30 July 1945

1200K Position
Lat. - 33-38'N
Long. - 140-15'E

0348 Submerged between Inamba Shima and Mikura Shima to work on main hydraulic plant. Shifted main and emergency by-pass valves.
1636 Surfaced.
1853 Sighted and sank mine. Lat. 33-30'N. Long. 140-43'5'E.
2106 Received message from ComSubiac directing us to proceed to Areas One, Two and Three, arriving on station sunset 1 August. ARCHERFISH will coordinate patrols of ATULE and our-selves.

— page 209 —
12001 Position
Lat. - 35-28'7N
Long. - 142-02'7E

: 0150 Received message from ARCHERFISH. We have area two for first five days. Shift is in numerical order of areas every five days.
1225 Sighted two "BETTY's", distant 8 miles, heading for DOSHIHU. Submerged.
1230 A loose link between cells 30 and 31 in the after battery arecawhen full speed was rung up. The arc burned the duck board, filling vent cap and elbow.
1243 Surfaced. Jumped out cell thirty in the after battery and one cell in forward battery. We will carry this cell at the top of the cycle for the remainder of the patrol and renew the electrolyte during next refit.
1550 Sighted periscope dead ahead distant 1,000 yards. (Ship contact #1). Submerged. This periscope was dappled yellow and brown and was similar to our 2,414 inch size. Rigged a silent running and opened to the east. Could hear nothing.

2 AUGUST 1945

1230 Position
Lat. - 39-09'9N
Long. - 141-59'8E

CST merged to patrol off Kobe Zaki. Spent the day 3 miles off the beach, heading north, using ST radar and sound.
To contacts.
1900 Surfaced.
1212 Commenced northward search along the beach for night ship-ping. No contacts.

— page 210 —
1200I Position
Lat. - 39-19'5N
Long. - 142-09'5E

0328 Submerged eight miles northeast of Todo Saki. Headed in to three mile line for southerly patrol along the shore.
Heavy fog, using ST radar and sound.
1040 Heard three pingers evidently coming out of Yamada Ko.
(Ship contact #2). Very low visibility. Two went south and one went north.
1132 Surfaced to end-around the two southern ones. Still very foggy. Evidently they are two patrolers. Tracking nicely at 190T, speed 9. During this end-around, received indications of 10 centimeter radar. Maintained a minimum range of 8,000 yards.
1250 Submerged 8,500 yards ahead of target. Commenced approach, see special supplement.
1408 Surfaced in fog.
1501 Fog lifted very quickly. Submerged and closed beach.
1820 Sighted single Kaibokan patrolling in the entrance to RYORI WAN. (Ship contact #3). He is 'pinging as though he had something.
1822 Kaibokan released a pattern of depth charges and headed north. That should impress the local citizenry with the indomitable ability of the Grand Escort'Fleet.
1945 Surfaced. On examination of our torpedoes which we had made ready during the day, found one completely flooded and the other with a flooded battery compartment. This was caused by leakage hand-hole plates. Commence examination of all torpedoes.
Made night search along the shore, no'contacts.

4 August 1945

1200I Position
Lat. - 39-25'2N
Long. - 142-07'E

0342 Submerged north-east of Todo Saki for a patrol south along the coast.
0920 Heard possible pinging ahead. There is a heavy fog.
1009 Surfaced to verify this contact. Nothing on SJ.
1019 Fog lifted abruptly. Submerged and headed back into 3 mile line. Continuing patrol southward along the 3 mile line.
1500 Completed torpedo examination. Found no gaskets in four hand-hole plates and eight drain plugs, five joint rings were loose.

— page 211 —
1957
: 4 August 1945 (Cont'd)
: 1957
: 5 August 1945
: 1200I Position
: Lat. - 36-40'N
: Long. - 141-40'5E
: 0906
: The fog lifted. 'Submerged and headed into Utsusi Saiki.
: Sea flat, visibility good. Making periscope exposures every
: fifteen minutes, running deep between observations.
: 1216
: Heard pinging. Came to periscope depth and found two rail-
: bokens to the northeast of us distant 4,500 yards. (Ship
: contact #4). Went to battle stations, rigged for silent
: running and started approach. It looks as though they had
: heard us.
: Targets formed column, course 270°T and moved north of us,
: range 6,000 yards. They then reversed course and commenced
: to make a circle around us in a clockwise direction, keep-
: ing a radius of about 5,500 yards. Their signal search-
: lights were busy and it looked as though they were fully
: alerted. They are manouvering too much for a torpedo shot
: Targets are now southwest of us and have changed course to
: wards. This looks like a firing run. Went deep for a
: special supplement situation.
: 1307
: Targets faded out on JP.
: 1355
: All clear by periscope. The Jsp changed his mind.
: 1954
: Surfaced.
: 2240
: Received massage from ComSubPac to be on life guard station
: of Shiriya Saki on the eighth.

6 August 1945
: 1200I Position
: Lat. - 30-15'2N
: Long. - 142-02'E
: 0309
: Submerged off Todo Saki for a patrol southward along the
: 2-3 mile line. Sea calm, visibility good.
: 1100
: Sighted one small sampan in Namamishi Ko. He is too far in
: for a gun target. (Ship contact #5).
: 1821
: Sighted unidentified plane through periscope.

-9-

— page 212 —
6 August 1945 (Cont'd)
1956 Surfaced to clear area. We are supposed to take area three for tomorrow and then be in area one by 0400 on the 6th. Decided to make surface patrol the 7th and head up to our point.
2220 Converted No. 4 PET to a MET. Submerged to wash it out.
2350 Exchanged recognition signals with the ATULs.

7 August 1945
1200I Position
Lat. - 40-53'5N
Long. - 142-39'1E
0840 SD radar out of commission. Submerged to effect repairs.
1655 Repairs completed. Surfaced.
1701 SJ radar interference at 130°M. Would not reply to any challenge. It may be 3rd fleet units.

8 August 1945
1200I Position
Lat. - 41-35'N
Long. - 142-50'4E
0400 On life guard station. Weather inclement for air raids.
1246 Sighted a formation of six planes. No IPF and they may be BETTY's. Submerged.
1312 Surfaced.
1403 Submerged. No planes have arrived and there has been no traffic over the life-guard circuits.
1550 Weather cleared somewhat. Surfaced.
1625 Received message saying that carrier strikes had been postponed.
1628 Submerged.
1944 Surfaced.
2049 Sighted searchlights near Ominato.

9 August 1945
1200I Position
Lat. - 41-32'1N
Long. - 141-52'E
0400 On life guard station.
0700 Fighter cover appeared. Attack on Ominato commenced. Raids continued throughout the day. Our CAP could stay only about ten minutes. The carriers are evidently a great distance away.

-10-

— page 213 —
1400 One plane has splashed in Muttu Bay or Muttu Keiwar. It cannot get in. If he can paddle on out he should be in the entrance to Tsugaru Strait in 28 hours. His chances are not so good.
: 1615 Our current CAP informed us that this was the last raid of the day and that they were leaving. Submerged.

: 10 August 1945
: 1200I Position
: Lat. - 41-41'6N
: Long. - 141-54'7E
: 0400 On life guard station. No CAP appeared throughout the day. Our planes returned to Ominato. Either another plane splashed in Muttu Bay or they are orbiting yesterday's survivor.
: 1539 Received message from ComSubPac assigning us life guard station for 12 and 13 August.
: 1630 Raids completed.
: 1632 Submerged.
: 1945 Surfaced. We will patrol in Uchiiura Bay tomorrow. We hope to catch any shipping that may try to clear carrier target areas of Ominato and Hakodate.

: 11 August 1945
: 1200I Position
: Lat. - 42-05'5N
: Long. - 140-54'3E
: 0320 Submerged to conduct patrol in Uchiiura Wan from Suna Saki to Usujiri Wan. This is along the southwest shore and should be the shipping route.
: 1215 Became involved in a series of fish traps. Went deep and cleared.
: 1818 Sighted ship due north distant about 12,000 yards. (Ship contact #6). Battle stations. Angle on the bow is large and starboard.
: 1826 Ship is a destroyer. His track lies directly on the route from Murooran to Esan Sakl and I am six miles from it. He is combatting helming at about 15 knots.
: 1851 My decision to patrol off Suna Saki has cost us a nutte Class destroyer. The only consolation is that we found where the traffic was running. Target has rounded Esan Saki, probably for Ominato.
: 1947 Surfaced and headed for lifeguard station off Shiriya Saki.
: 2207 Received ComSubPac Serial 25 earfilling air strikes because of typhoon.

-11-

— page 214 —
12 August 1945

1200I Position
Lat. - 42-11'6N
Long. - 142-06'18E

0700 Seas are making up. We will make a surface patrol today across the entrance to Sugaru Strait.
1624 Received contact report from ATULE saying that a two ship convoy should round Erimo Saiki about 1700. Put on 4 engines and headed for intercept point three miles off Urakawa Ko.
1818 Land is visible, distant 10,000 yards. Submerged and headed into beach.
1840 Visibility is very poor, Headed southeast paralleling the beach, distant 2-3 miles.
2015 No contacts. Surfaced with radar flashes bearing 250°T.
2021 Exchanged calls with ATULE. Commenced a retiring search curve at 4 engine speed. ATULE is taking the area to north and west of us.

13 August 1945

1200I Position
Lat. - 42-03'15N
Long. - 142-02'18E

0112 Received ATULE's contact on two patrollers. This is not their original contact.
0115 Headed in to Uchiiura Wan to continue search for initial ATULE contact.
0130 Heard several distant explosions.
0343 Submerged to patrol along route from Muroran to Esan Saiki. Visibility poor, seas about number 5.
1956 Surfaced. No contacts throughout the day. Headed out to patrol off Shiriya Saiki.

14 August 1945

1200I Position
Lat. - 41-20'18N
Long. - 141-32'15E

0324 Submerged with Shiriya Saiki bearing 330°T, distant seven miles. Patrolling 2-3 miles off-shore.
1947 Surfaced. We will patrol this area tomorrow.

-12-

— page 215 —
15 August 1945

12001 Position
Lat. - 41-20'6N
Long. - 141-32'15E

0334 Submerged. It is foggy and visibility is poor.
1123 Sighted large sea truck heading south, distant 8,000 yards.
Went to Battle Stations Torpedo. (Ship contact #7)
1128 Fog came in and sight contact was lost. Tracking by SI radar and sound.
1150 Range is too great to shoot and target is now behind the minefield. Opened out for an end-around. There is a spot to the south where we can catch him at about 1530 either with torpedoes or gun.
1213 Surfaced on four main engines. Started end-around.
1227 Received ComSubPac Serial 32 directing all subs to cease all attacks. Read same to crew over 1 MO. Secured from Battle Stations, badly disgruntled that peace caught us holding a bead on the vermin.
1250 Plane contact six miles. Submerged to co-ordinate on the vararies of fate.
1653 Surfaced.

: 16 August 1945

12001 Position
Lat. - 39-15'N
Long. - 142-46'E

0228 Received ComSubPac Serial 36 directing us to area 3. Proceeded to area.
1417 Sighted and exploded mine. Lat. 38-49'5'. Long. 142-46'E.
1527 Received CSP Serial 38 directing us to area 1.
1545 Sighted and sank mine. Lat. 36-46'5N. Long. 142-59'E.

17 August 1945

12001 Position
Lat. - 40-04'9N
Long. - 143-42'7E

0937 Made trim dive.
0958 Surfaced.
1450 Sighted and exploded mine. Lat. 40-11'4N. Long. 143-14'5E.

18 August 1945

12001 Position
Lat. - 41-19'5N
Long. - 142-07'E

-13-

— page 216 —
1200I Position
Lat. - 41-46'N
Long. - 143-55'E

0431 Friendly SJ radar interference on the SJ radar. Believe it to be the ARCHERFISH. Decided to contact her and exchange movies.

0505 SJ radar interference disappeared.

1230 Sighted ARCHERFISH surfacing bearing 325°T, 10,000 yards. Exchanged recognition signals and call signs.

1310 Completed exchange of movies. We will patrol Area One west of Long. 143°E while ARCHERFISH patrols east of 143°E.

20 August 1945

1200I Position
Lat. - 41-11'N
Long. - 142-18'E

1058 Made trim dive.
1117 Surfaced.

21 August 1945

1200I Position
Lat. - 41-39'N
Long. - 142-11'E

1705 APR contact on enemy aircraft radar.
1707 Submerged.
1752 Surfaced.

22 August 1945

1200I Position
Lat. - 40-58'N
Long. - 142-44'E

2000 Received Comsubpac Serial 50 designating rendezvous on 26 August 1945 and informing us that we would be a part of the submarine delegation at TOKYO for the formal surrender of JAPAN.

23 August 1945

1200I Position
Lat. - 41-17'N
Long. - 142-12'E

0749 Sighted single "BETTY" breaking through overcast at 120°T, 3 miles.

0750 Submerged. Conducting submerged patrol.

1611 Surfaced.

-14-

— page 217 —
24 August 1945

12001 Position
Lat. - 41°-10'15"N
Long. - 142°-39'15"E

0656 Sighted 2 Samps bearing 050°T, 12,000 yards. (ship contact #8). Maneuvered to avoid.
0737 Sighted third Samps bearing 112°T, 12,000 yards. Maneuvered to avoid. (ship contact #9).

25 August 1945

12001 Position
Lat. - 41°-19'N
Long. - 142°-24'15"E

2155 Received TIGRONE's Serial 5 reporting north-bound ship aloft coast. Maneuvered inshore to intercept.

26 August 1945

12001 Position
Lat. - 41°-15'N
Long. - 142°-35'15"E

0043 SJ contact 190°T, 19,450 yards. (Ship contact #10). Commenced tracking. Target was large as evidenced by the long-range contact by SJ. It rounded Shriya Saki end course 280°T, speed 15 knots. It is believed that he was heading for Hakodate.
0153 Lost SJ contact at 23,000 yards, bearing 240°T.

27 August 1945

12001 Position
Lat. - 39°-44'N
Long. - 142°-57'15"E

28 August 1945

12001 Position
Lat. - 40°-17'N
Long. - 143°-00'15"E

0430 Made rendezvous with the TIGRONE and exchanged m.v. ...

29 August 1945

12001 Position
Lat. - 39°-35'15"N
Long. - 142°-25'10"E

-15-

— page 218 —
29 August 1945 (Cont'd)
0334 Exchanged recognition signals and calls with the SEGUIN by SJ radar.
0705 Submerged for trim.
0755 Surfaced.
2232 Exchanged recognition signals and call signs with the CAVALLA by SJ radar.

30 August 1945
12001 Position
Lat. - 37-41.ON
Long. - 143-19.5E
1100 Made rendezvous in accordance with ComSubPac Serials #50 and #65.
1102 Received Benny's Peace Lakers Oporder #1-45 from the RUNNER by line.
1235 Underway for Tokyo.

31 August 1945
12001 Position
Tokyo Bay
Moored alongside U.S.S. PROTECTUS (AS19) in Tokyo Bay.
Commenced overhaul No. 1 Main Engine.

31 August - 2 September 1945
12001 Position
Tokyo Bay
Very pleasant period during which U.S.S. NAGATO, USS I-400, U.S.S. I-401, and U.S. Submarine Base, Yokosuka, Japan were inspected by all hands. The latter was commissioned with traditional submarine thoroughness on 2 September.

3 September 1945
12001 Position
Lat. - 34-55N
Long. - 139-28E

0800 Completed overhaul on No. 1 Main Engine. Received 1 officer and 29 men on board for transportation to Pearl.
0910 Underway for Pearl Harbor, T.H., in company with U.S.S. RUNNER, U.S.S. PILOTFISH, U.S.S. CAVALLA, U.S.S. RAZORBACK, U.S.S. ARCHERFISH, U.S.S. MUSKALLUNGE, U.S.S. HANK, U.S.S. TIGRON, U.S.S. HADDO and U.S.S. SEGUNDO, in accordance with CSS 20 Oporder 1-T-45 of 2 September.

-16-

— page 219 —
4 September 1945
1200K Position
Lat. - 33-26.4N
Long. - 146-54.3E

0200 Set all ship's clocks to King (-10 zone) time.
0855 Submerged for trim dive.
0906 Surfaced.

5 September 1945
1200K Position
Lat. - 32-18.6N
Long. - 154-15E

2100 Set all ship's clocks to Love (-11 zone) time.

6 September 1945
1200L Position
Lat. - 31-08.6N
Long. - 161-15.6E

7 September 1945
1200L Position
Lat. - 29-43.5N
Long. - 168-29E

2111 U.S.S. HAKES left formation to proceed to Midway.

8 September 1945
1200L Position
Lat. - 28-28.7N
Long. - 174-56.8E

1900 Set all ship's clocks to Hike (-12 zone) time.

8 September 1945
1200M Position
Lat. - 27-12.1N
Long. - 178-37.1W

0000 Changed date to 8 September 1945 and time to +12 zone time.
0645 Crossed 180th meridian.

-17-

— page 220 —
9 September 1945
Lat. - 24-04-0N
Long. - 173-48.2W

1535 Submerged for trim dive.
1545 Surfaced.

: 10 September 1945
Lat. - 22-12N
Long. - 168-10.5W

0109 U.S.S. HAKER rejoined formation.
0300 Set all ship's clocks to Nan (+11 zone) time.

: 11 September 1945
Lat. - 21-03.5N
Long. - 152-26.4W

2300 Set ship's clocks to +9 zone time.

: 12 September 1945
1000 Arrived U.S. Submarine Base, Pearl Harbor, T.3.

-18-

— page 221 —
1) WEATHER
From 1 August to 28 August 1945 the weather off the eastern coast of Honshu corresponded closely with the Sailing Directions and Pilot Chart. Heavy fogs, rain and mist were constantly present close to shore while from 10 to 60 miles off shore the weather varied from complete overcast to clear with occasional rain but little for. Flat calms to state one sea prevailed with corresponding winds. Two short periods of wind and seas state 3 to 4 were encountered - 12 to 13 August and 23 to 26 August.

(D) TIDAL INFORMATION
Currents encountered off the east coast of Honshu and southeast coast of Hokkaido corresponded closely to data found on the charts of the area and in the Sailing Directions.

(E) NAVIGATIONAL AIDS
No navigational lights were sighted. Radar fixes were easily obtained whenever within radar range of land.

-19-

— page 222 —
1557T 36-12N 1-SS(EC) 1000 yds 1-day sight 2 turned south, 1
: 21 July 45142-11'8E 1-sight 2 turned north, Sur-
: 2 1040I 39-28N 3-SMC(TUN) 6000 yds 1000 yds 2 turned north, Sur-
: 3 Aug 45 142-07'9E 9 kt 2 turned north, Sur-
: 3 1820I 39-03'15N 1-SMC(EC) 6000 yds 6000 yds 2 turned north, Sur-
: 3 Aug 45 141-59'1E 1-SMC(EC) 6000 yds 6000 yds 2 turned north, Sur-
: 4 1216I 33-42'11N 2-SMC(EC) 4500 yds 4500 yds 2 turned north, Sur-
: 5 Aug 45 141-41'1E 1-SMC(EC) 4500 yds 4500 yds 2 turned north, Sur-
: 5 1100I 39-15'18N 1-MIS(EC) 6000 yds 6000 yds 2 turned north, Sur-
: 6 Aug 45 142-02'1E 1-SMC(EC) 6000 yds 6000 yds 2 turned north, Sur-
: 6 1818I 41-56'18N 1-DD(EC) 12000 yds 12000 yds 2 turned north, Sur-
: 11 Aug 45 146-59'14E 1-SMC(EC) 12000 yds 12000 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123I 41-20'7N 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 15 Aug 45 141-32'14E 1-SMC(EC) 1600 yds 1600 yds 2 turned north, Sur-
: 7 1123

— page 224 —
91 2 60 50 3-DE (Possible kaibokan) 500 9 JP JC crews
: 87 2 90 149 1-DE (Kaibokan) 500 Searce 1J JC crews
: 73 2 60 149 2-DE (Kaibokan) 500 Same QB JK ping 18 JP

-22-

— page 226 —
(K) MAJOR DEFECTS OR DAMAGE (Cont'd)

found to be compressed indicating that the non-return valve was jammed in a partially open position or that the spacer on top of the spring was canted. The valve was reassembled leaving out the spacer and the by-pass valve was reassembled leaving out the leather cup washer. The plant was started and operation was normal.

In Saipan the automatic by-pass and non-return valves were removed and inspected by tender personnel. The leather cup washer was renewed. All oil was drained from the system and replaced as all parts of the disintegrated leather cup washer were not found in the strainer. After reassembly of the valves, operation was normal. On July 30 the system began a very slow charge of the accumulator when the pilot valve was tripped by disincarage of the accumulator through normal leaks in the system. If hydraulic power was being used at the time the charge started, the charge was normal. There were two ways to make the accumulator charge normally after a slow charge had started: (1) by venting the line between the automatic by-pass valve and the pilot valve or (2) by lifting the pilot valve by hitting the upper arm of the yoke. No defects were found by disassembly and inspection of the automatic by-pass valve, non-return valve, and pilot valve. After reassembly, the operation of the plant had not improved. It was then decided to exchange the automatic by-pass and non-return valves and body with the one in the emergency system. To permit this exchange the cut off valves were turned to shut off the oil supply and it was then discovered that the pins in all four (4) cut-off valves were sheared. These had to be replaced. Since the exchange has been made, the main plant has operated normally. Overall or replacement of the automatic by-pass and non-return valves now installed in the emergency system is to be accomplished during the next refit.

During the last refit the bull and pinion gears and bearings on #2 turbo blower were renewed. Excessive vibration as the blower was slowing down was noted. This vibration continued to increase until August 24 when the bearings were inspected. Considerable wear was noted on the bearings but scraping of the high apcs on the bearings reduced the vibration materially. Replacement of these bearings is to be accomplished during the next refit.

2. On 31 July 1945, shortly after submerging in a routine dive, a fire was discovered in the after battery tank. After shifting the load to the forward battery and shutting off all ventilation to the after battery, the tank was entered. Dense smoke was found to be issuing from a charred rubber ventilation elbow on cell #30 and from the watering board which was stowed at the time over that cell. Bits of charred rubber and ashes were visible in the electrolyte of cell #30. Rather than risk plate damage, this cell was jumped out. In accordance with BuShips' instructions, one cell (cell #97) was also jumped out of the forward battery.

— page 227 —
1. MAJOR DEFECTS OR DAMAGE (Cont'd)
2. Contributing causes to this casualty were:
    (1) Overheating of cell terminal-bus bar connections when large current surge was drawn at time of dive. The bolts in these connections were not properly secured, resulting in poor contact.
    (2) The overheating mentioned in (1) started a fire on the under side of watering board. This fire also burned the filling vent cylinder and ventilation elbow.

During the last refit a number of cells in this battery were disconnected in attempts to isolate grounds. Apparently in replacing cell connectors, a final tightening was overlooked. It is felt that during the next availability the renewal of electrolyte plus the installation of new ventilation elbow and filling vent cylinder in cell #30 aft will put this cell back into normal service.

ORDNANCE AND GUNNERY

Prescribed routine for weekly charge and checking of cell group voltages was carried out during this patrol and since only two of the torpedoes had the cell group terminal blocks installed, this necessitated disturbing the condition of the rooms and the tubes frequently. Ship board precautions against flooding cannot be over emphasized with Nk 131's. This was brought home when two torpedoes completely flooded rendering both batteries useless and beyond our capacity to repair. Both torpedoes flooded because of a missing gasket on a battery hand hole plate. On reaching, two more hand hole plates were found without gaskots, as well as seven drain plugs. In addition five joint rings and several battery compartment poppet valves were loose to the extent that the torpedoes would probably have completely flooded. All torpedoes passed the leakometer test. This indicates that the vacuum gauge test is not reliable and that an individual check of all skin openings and joints is necessary upon receipt of torpedoes on board. An actual test by flooding each tube when the torpedo is loaded would seem to be the only absolute test. It is recommended that a moving picture of the T.D.C. face be taken by the ship's cameraman, using infra red photography, during the time of firing to supplement and check firing data. Twenty-five rounds of 5M/25 H.E. were carried but unfortunately no opportunity was found to observe results. Forty eight rounds were carried in two skids forward using skid straps and sea straps for securing them. In addition to the full allowance of 20mm and 450 Cal. ammunition, 700 rounds of 40mm were carried using four 16 round stowages topside with the remainder stowed in the magazine.

— page 229 —
1. RADAR (Cont'd)
scope for observation. As the men became accustomed to seeing targets in the A-Scope grass, use of the A-Scope expanded sweep, and the 40, 000 yard PPI sweep with one minute intervals between, became normal operation.
-SD-5- Enroute to the area, from sunrise to sunset, this gear was keyed once every two minutes. The SD keying was followed immediately by IFF keying. The ABK was on at all times.
In the area, the SD and IFF were keyed only upon orders from the bridge.
-APR- At all times when surfaced, normal routine was to use the automatic sweep TN-2, TN-3, TN-2, APR-5, TN-2, etc. At the end of the patrol, we used the TN-1 unit occasionally.

(3) TROUBLES
-SJ-
1. Symptom: No PPI rotation.
Correction: Replaced with auxiliary engine tachometer cable.
Cause: Failure of cable after one patrol.

2. Symptom: No power.
Correction: Replaced Fl & P2. These fuses continued to heat up and burn out, so cleanup up and tightened fuse connections. Failures continued to occur therefore put a Tan in front of controller to dissipate heat.
Cause: Excessive current drawn from the regulator by ST installation.

3. Symptom: Jittery range step.
Correction: After checking wave forms, voltages and tubes, found that #567 adjustment cured trouble.
Cause: Resistance change in circuit.

4. Symptom: No output from "B" Regulated Rectifier.
Correction: Replaced C6 & C2.
Cause: C6 shorted to ground. C2 leaking oil.

5. Symptom: Bad arcing and erratic sweep in PPI.
Correction: Repaired opened R44 and replaced.
Cause: Resistor failure, and no spare.

6. Symptom: Fuzzy Sweeps.
Correction: Readjusted Regulated Rectifier Voltage.
Cause: Straying RR voltage.

— page 230 —
7. Symptom: Bad standing wave interference.
    Correction: Enlarged gap between wave guide and transmitter, Realigned.
    Cause: Jarring of wave guide out of line.

: 8. Symptom: No 300V supply to units.
    Correction: Shorted out meter switch in control unit.
    Cause: Switch failure.

: 9. Symptom: Tuning wavered with roll of ship.
    Correction: Opened tuning receptacle in feeder unit and found salt water and oil. Cleaned.
    Cause: Unknown leak, which has not returned since.

: 10. Symptom: Low output voltage.
    Correction: Replaced 5R4-6's with 5U4-6's and increased output 30 volts.
    Cause: Weak tubes.

: 11. Symptom: Sweep triggering at random.
    Correction: Replaced V1 & V2 (6SN7) in Modulation Generator.
    Cause: Weak tubes.

: 12. Symptom: Regulator Rectifier voltage low and no regulation.
    Correction: Replaced C7, R26, R21, R22, & F1 in 0Wn Rectifiers. Replaced H17 in "B" rectifier.
    Cause: Failure of parts.

-SD-5-

: 1. Symptom: No grass.
    Correction: Replaced V806, (6AC7) in receiver.
    Cause: Failure of tube after 94 hours.

: 2. Symptom: No grass.
    Correction: Replaced (6J5) in receiver.
    Cause: Failure of tube after 118 hours.

: 3. Symptom: Sweep moved to left side of scope. Decrease in intensity.
    Correction: Replaced 2X2 in receiver power supply.
    Cause: Failure of tube after 214 hours.

: 4. Symptom: Low ranges.
    Correction: Replaced 8014A tubes.
    Cause: Weak tubes after 226 hours of use.

-28-

— page 231 —
5. Symptom: Lost all sweeps.
    Correction: Replaced 2X2 in power supply.
    Cause: Failure of tube after 280 hours.

6. Symptom: No sweeps.
    Correction: Replaced 22,000 $ watt resistor in plate load.
    Cause: Weak resistor.

7. Symptom: Double pulsing and arcing.
    Correction: New setting of locking voltage cured trouble pulsing, and after thorough check to no avail, found that a 3 mm, f. line loading capacitor across the TBL lines in diplexer cured arcing.
    Cause: Unknown.

-APR-5-

1. Symptom: Low sensitivity, no crystal current.
    Correction: Replaced crystal.
    Cause: Failure of crystal.

-APR-1-

1. Symptom: Low sensitivity.
    Correction: Replaced 0551s.
    Cause: Weak tubes.

(N) SONAR

(1) GENERAL

- TDM - The TDM, with dome, was used at all times when surfaced. This constant use led to many failures, the main one being a weak flyback switch. Finally, we used a microswitch and then DUDLEY, William Lee Jr., RTL/c(T), USNR designed a simple switch consisting of two flexible brushes which were shorted by a piece of metal when the head rotated past 180 degrees. These two brushes were mounted on plastic and this placed on top of the old Square D flyback switch box.
   Routine procedure on contact was: Dive and have the after torpedo room fire an NAE which always was held ready in the signal gun.

- WDA - This gear worked unsatisfactorily during local operations but was repaired so that sensitivity was fair. Sound conditions were poor in the area, but even so listening ranges were not up to expectation. Thorough inspection revealed normal operation, nevertheless.

-29-

— page 232 —
1. Symptom: No stylus sweep.
Correction: Repaired flyback switch.
Cause: Poorly constructed flyback switch, in that it's springs are not strong enough to take the constant use demanded of them.

Note: Ultimately replaced flyback switch with a microswitch and later by newly designed switch described previously in report.

2. Symptom: No trace.
Correction: Replaced Cl05, RL17, and since we had no spare Kl04, removed this relay and jumped terminals 4 and 5.
Cause: Unit failures.

3. Symptom: Lag in stylus sweep.
Correction: Slack wire brake tightened up.
Cause: Vibration loosened the brake.

4. Symptom: Low sensitivity.
Correction: Replaced V3(65N7).
Cause: Weak tube.

5. Symptom: No stylus sweep.
Correction: Replaced cord.
Cause: Broken cord.

-QB-

1. Symptom: Training motor-generator noisy.
Correction: Cleaned worn out earrings. (New Departure 5606).
Cause: Bearing failure and no spares.

2. Symptom: Low sensitivity.
Correction: Opened jumper connection across output transformer so output is halved. Tightened.
Cause: Loose connection.

— page 233 —
1 'CONFIDENTIAL

(O) DENSITY LAYERS

In the vicinity of the Nanpo Shotots a 38 degree temperature change was recorded.
Off the eastern coast of Honshu, sharp negative gradients from 5 to 10 degrees were noted. Bathymetrograph cards are being forwarded to the Hydrographic Office.

(P) HEALTH, FOOD, AND HABITABILITY

Health throughout the patrol was very good. 15 men were effected with diarrhea for a period of two days and its cause was attributed to one bad can of ham.
Variety, quality, and preparation of food was excellent.
Habitability was excellent.

(Q) PERSONNEL

(a) No. of men detached after previous patrol 17
(b) No. of men on board during patrol 73
(c) No. of men qualified at start of patrol 60
(d) No. of men qualified at end of patrol 71
(e) No. of unqualified men making first patrol 10

(R) MILES STEAMED - FUEL USED

Pearl to Wake 1980 miles 23,745 gallons
At Wake 698 6,264
Wake to Saipan 1332 21,071
Saipan to Area 1113 26,999
In Area 6430 48,000
Area to Tokyo 326 6,000
Tokyo to Pearl 3455 51,375

(S) DURATION

Days enroute to Wake 7
Days in Wake Area 3
Days enroute Wake to Saipan 5
Days enroute Saipan to Area 7
Days in Area 31
Days enroute Area to Tokyo 2
Days at Tokyo 2
Days enroute Tokyo to Pearl 10
Days submerged 10

(T) FACTORS OF ENDURANCE REMAINING - TOKYO

Torpedoes Fuel Provisions Personnel Factor

18+2 36,000 12 20

-31-

— page 234 —
1. RADIO, SONAR, RADAR COUNTERMEASURES

(a) JAP traffic and interference was noted on the new SAF-PLAN series and also on the ASR channels. JAP CW transmissions were on both sides of 4475 KCS, and off-frequency tuning did not help. One rebel, in an attempt to provoke his listeners made reference to those D--- Yanks that he was going to get.

(b) Jamming - none.

(c) Deception - none.

(d) Photographs - one taken of station on Shizuri Saki point.

(2) SONAR COUNTERMEASURES -

(a) Enemy pinging was always on 14 kc or 18 kc. Short and long scale and also intermittent pinging were observed.

(3) RADAR COUNTERMEASURES -

(a) Interception of enemy signals on APR.

(1) Vicinity of Nanpo Shoto group:

| FREQ/PRF/PW | East Long. DEG-MIN. | North Lat. DEG-MIN. | Sweep | Further Data |
||||-------||
| 111/500/20   | 139.38            | 26.18            | 4 RPM | Weak pip.    |
| 145/750/5    | 139.52            | 30.35            | fast  |             |
| 152/1200/10  | 139.43            | 28.50            | slow  | weak pip.   |
| 165/700/18   | 139.48            | 30.30            | fast  |             |
| 175/250/15   | 141.29            | 32.21            |       | strong      |
| 185/180/7    | 139.45            | 26.42            |       |             |
| 200/250/5    | 139.46            | 27.07            | slow  | weak        |

(2) Vicinity of Northern Nanpo Shoto group, Tokyo area to Imubo Saki:

| FREQ/PRF/PW | East Long. DEG-MIN. | North Lat. DEG-MIN. | Sweep | Further Data |
||||-------||
| 76/400/4     | 142.39            | 35.12            |       | nondirectional |
| 97/750/20    | 140.39            | 33.03            | slow  |             |
| 103/1000/18  | 140.25            | 33.28            | slow  |             |
| 103/200/17   | 141.21            | 34.50            | slow  |             |
| 111/500/30   | 141.51            | 34.11            |       |             |
| 144/900/11   | 140.35            | 33.10            |       |             |
| 152/280/10   | 141.51            | 34.09            |       |             |
| 163/750/9    | 140.19            | 33.37            |       |             |

-32-

— page 235 —
1. CONFIDENTIAL
(U) RADIO, SONAR, RADAR COUNTERMEASURES (Cont'd)
(3) Vicinity of Imubo Sakl to Southern Hokkaido:
PREQ/PRF/PW    East Long.    North Lat.    Sweep'    Further Data
    DEG-MIN.    DEG-MIN.
48/220/70    144.05    39.50    steady    -
75/300/50    142.25    39.20    Very slow    erratic sweep
76/500/55-80   142.55    42.07    steady    -
89/300/40    143.20    36.23    slow    erratic sweep
98/300/17    141.27    41.59    slow    irregular
103/800/9    142.17    39.13    -
104/450/18    141.48    42.03    -
111/1200/12    142.25    39.20    -
144/350/12    142.18    39.11    slow    RPh-manual
144/500/5    142.10    36.35    slow    manual
145/400/15    142.00    39.00    slow    -
147/200/20    142.25    39.20    very slow    -
147/300/7.5    141.52    38.47    -
148/450/12    142.00    41.30    -
150/450/12    141.15    40.06    steady    -
150/300/8    142.19    41.32    slow    -
151/450/9    141.44    42.10    -
156/300/10    142.15    41.27    slow    -
2900/3000/6    142.03    39.03    only one sweep

(b) Enemy interference on radar scopes - none.
(c) Jamming and deception - none.
(d) Photographs - none.

(V) REMARKS
None of the enemy that I saw in Yokosuka ashore and aboard the I-401 appeared to be defeated. They were still arrogant and their morale seemed excellent. They haven't learned their lesson, and it looked like they would ask for a return match.
I hope the peace will justify the losses we suffered to bring it about. Somehow I don't believe our dead would rest if it turned out otherwise.

— page 236 —
103/416-3
Serial: 065
C-O-N-F-I-D-E-N-T-I-A-L

FIRST ENDORSEMENT to
U.S.S. GATO (SS212)
Report of Thirteenth War Patrol.

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

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

1. The Thirteenth War Patrol of the U.S.S. GATO was conducted in areas off the East Coast of Honshu during the period of 3 July 1945 to 12 September 1945 under the command of Commander R. Holden.

2. The patrol was primarily a life guard patrol with no opportunity arising to rescue survivors. The few worthwhile torpedo targets contacted were aggressively pursued. One contact developed into a successful single torpedo attack on 3 August, 1945. The patrol vessel targeted undoubtedly sank because scores stopped and breaking up noises were heard.

3. The GATO was making an end around on another patrol vessel preparatory to attacking on 15 August 1945, when the "Cease Fire" order was received.

4. The patrol was of 66 days duration, 31 days were spent in the area, 10 of which were submerged and 3 were spent in Tokyo as part of the Navy contingent arriving for the surrender ceremonies. In spite of the many days at sea, by maintaining the ship in excellent condition with the ship's force, the U.S.S. GATO was ready to proceed to her new station the day after her arrival at the Submarine Base, Pearl Harbor.

5. The Division Commander congratulates the Commanding Officer, officers and crew, upon the damage inflicted upon the enemy and upon the completion of the last war patrol of the U.S.S. GATO.

— page 237 —
1/3
FC5-10/A16-3
Serial: (0310)
CONFIDENTIAL

SECOND ENDORSEMENT to
U.S.S. GATO (SS212) -
Report of War Patrol
Number Thirteen.

From: The Commander Submarine Squadron TEN.
To: The Commander-in-Chief, United States Fleet.
Via: (1) The Commander Submarine Force, PACIFIC FLEET,
   Administration.
   (2) The Commander-in-Chief, U. S. PACIFIC FLEET.

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

1. Forwarded, concurring in the remarks of the Commander Submarine Division ONR HUNDRED THREE.

2. The Squadron Commander congratulates the Commanding Officer, officers and crew of the U.S.S. GATO upon the completion of that vessel's Thirteenth War Patrol.

3. It is recommended that the U.S.S. GATO be credited with the following:

SUNK
1 MISC. Patrol boat (ZU) 200 tons
Total Sunk 200 tons

G. J. FISHER
[Signature]

— page 238 —
1-FF (Kaibokan) (EU) - 800 tons (Special Report) - 800 tons
: TOTAL SINK - G. C. C. FORD, Chief of Staff.

Distribution & authentication on next page.

— page 239 —
15-10(A)/ SUBMARINE FORCE, FALKLIN F-1
A16-3(18)
Serial 02375
CONTINENTAL
TETRAD BONOES, BNT to
GATO Report of
Thirteenth War Patrol.
GOMSUBSCRIBE PATROL REPORT NO. 922
U.S.S. GATO - THIRTEENTH WAR PATROL.
Subject: U.S.S. GATO (SS212) - Report of Thirteenth War Patrol
DATE: July 12 September 1945

DISTRIBUTION:
(Complete Reports)
(7)
(5)
(6)
(1)
(1)
(8)
(2)
(1)
(2)
(1)
(2)
(3)
(2)
(

— page 241 —
6 December 1942
NAME: GATO
FROM: CO USS GATO (SS-212)
SERIAL DATE: 1 Form Report of action in Lat. 05.00 S, Long. 152.58 E, during 3rd War Patrol (5 Nov - 23 Dec 42).
(SOPAC: U.S. Submarine Actions)
FILED: War Diary
Separately as ORIGINAL

: 21 Jan - 19 Feb 43
NAME: GATO
FROM: CO USS GATO (SS-212)
SERIAL DATE: 6 Form Reports of action in Lat. 06.12.5 S, Long. 155.51E, during 4th War Patrol (13 Jan - 26 Feb 43). Claims 1 Naval supply ship, 2 AK's sunk; 1 transport damaged.
(SOPAC: U.S. Submarine Actions)
FILED: War Diary
Separately as ORIGINAL

: 4 April 1943
NAME: USS GATO
FROM: Commander TASK FORCE SWYEN-TWO
SERIAL: 0091
DATE: 24 April 1943
SUBJECT: USS GATO, Battle Damage from depth charge attack
Report of battle damage to USS GATO as a result of depth charge attack by JAPANESE 4 Apr 43. List of damage to gether with photographs.
(SOWESPAC: USS SUB:15)
FILED: War Diary
Separately as ORIGINAL under TASK FORCE 72

: ACTION REPORT 29-100 REV. 12-46
61-27752
MICTROSERIAL NO.

— page 242 —
3 August 1944
NAME: GATO
SERIAL: 04
DATE: 7 February 1944
SUBJECT: SPECIAL MISSION
Report (to CTF 72) of evacuation of one Australian Coastwatcher and seven downed Allied Airtars assembled at Matankunai, Open Bay, New Britain during EIGHTH WAR PATROL (SOWSPAO; SUB OPS)
FILED: War Diary
Separately as CARBON COT; as DUPLICATE COT

DATE: 3 August 1945
NAME: GATO
SERIAL: 001-16
DATE: 12 September 1945
SUBJECT: SUBMARINE ACTION REPORT, Forwarding of
Forwards report of one torpedo firing on THIRTEENTH WAR PATROL east of Honshu and in the approaches to Tsugaru Strait. Credited with one sinking.
(CRNPAC: SUBS)
FILED: War Diary
Separately as ENC. to SUBSPAC ser 00358 of 25 Sep 45

MICROSERIAL NO. | ACTION REPORT | OPNAV FORM 380-13 (11-55) | 380-13 (11-

— page 246 —
3522/111-1
Serial (010)
CONFIDENTIAL

Subject: Material damage caused by depth bombing of the U.S.S. GATO

5. More were no injuries to personnel.

6. Performance of their duties and their reactions by the officers and men of the crew of this vessel during this emergency were in accordance with the best traditions of the naval service.

W. G. HENRS

Copies to:
Bushings (8)
Dulzell
Contact NYD Parts NI
Supplying, Groton

— page 247 —
016
Serial: 016
U.S.S. GATO (SS212), Flagship
FIRST ENDORSEMENT to
C.O., USS GATO 1tr.
SS212/111-1 dated
April 1, 1942.
Care of Postmaster,
San Francisco, California,
April 2, 1942.

CONFIDENTIAL

From: The Commander Submarine Division EIGHTY ONE.
To: The Commander-in-Chief, United States Fleet.

Via:
(1) The Commander Submarine Squadron EIGHT.
(2) The Commander Submarines, Pacific Fleet.
(3) The Commander-in-Chief, Pacific Fleet.

Subject: Material damage caused by Depth Bombing of the U.S.S. GATO.

1. Forwarded.

2. Commander Submarine Division Eighty One was on board the GATO, flagship Submarine Division Eighty One, at the time that this vessel was bombed. The Commandant Twelfth Naval District convened a Board of Investigation on March 24, 1942, to investigate the circumstances relative to this bombing.

3. Although this incident was of such a serious nature that it might have resulted in the loss of the GATO, nevertheless, it was not without some benefit in that the bombing proved certain design features and strengthened morale. To know that our latest type of submarine can withstand punishment with only minor damage is most gratifying. It is of interest to note that the silver soldered joints in the high pressure air lines within the main ballast tanks, which were installed under the most adverse conditions during the training period of the GATO by the Submarine Base, New London, Conn., withstood the shock of bombing without a single failure. This alteration to the high pressure air lines has eliminated, in the opinion of the Division Commander, the greatest defect that our newest submarines possessed.

4. The performance of duty by the Commanding Officer, officer, and crew of the GATO during this emergency was of the highest order.

Copies to:
Bushpie, BuOrd,
Comdt. NYD Ports.
CO S/N Base, NL
Supahip Groton
Insurv.
CO GATO.

W. M. DOWIES

— page 248 —
12 APR 1942
UNITED STATES PACIFIC FLEET
SUBMARINES, PACIFIC FLEET
Serial 0413
Care of Postmaster,
San Francisco, California,

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

Subject: Material damage caused by Depth Bombing of the U.S. GATO.

1. Forwarded.

T. WITHNER.

— page 249 —
3 May, 1942
Date: 3 May, 1942
Location: 3 May, 1942
Latitude: 3 May, 1942
Longitude: 3 May, 1942

Weather Conditions: Overcast.
Sea Conditions: Light sea with white caps from N.E.
Sound Conditions: Excellent.
Type of Operative: Patrol off North Pass, KWAAJABIN ATOLL.
Specific Objective: CV (KASUKA NARU - converted).
Crossing: 1st, U.S.S. GAZO
Height: CV (KASUKA NARU) with 2 DD screen, 1 patrol vessel off on transce
to North Pass.
Type of Attack (Own): Submerged torpedo attack at periscope depth.
Prior Description: At 1315 sound operator reported high speed screws.
At 1415 sighted target bearing 004°, 4,000 yards, course 114°, with 2 DD screen. Turned to attack course of 060°, At 1325 fired 5 torpedoes, range 1500 yards.
Response employed: Own; Torpedoes (5).
    Heavy: Echo ranging by patrol vessels and sonic
    Search by 2 DD's.
Attrition expended: Torpedoes (5).
Valuable Tactics employed: Own; Deep autofinance (230°) - silent running.
Torpedo attack (Own):
    Height: 1500
    Length: 65
    Straight sides.
    Type spread: 2 1/2° divergent.
    Attack: Opposed by close screen.
    Undetected.

Results: (Certain): None
    (Attained): Two hits. Sound operator heard loud water noises
    ² minutes after firing, on bearing of target. Hon and officers
    in forward torpedo room, pump room and after torpedo room
    reported feeling two jars after firing.

Damage to Own Ship: None
Brief Remarks: Results of attack were not confirmed by visual observation
    because of necessity of taking deep submergence to escape A/S
    measures by 2 DD's of screen and 2 patrol vessels. 5/4/42
    observed target at anchor south of ROI ISLAND apparently
    undamaged.