U.S.S. ENTEMEDOR (SS-340) — war patrol report SS-340_ENTEMEDOR.pdf

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START OF REEL
JOB NO. [HANDWRITTEN: F 108]

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[Small numbers next to bars on left, very faint]:
4.5
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5.6
6.3
7.1

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OPERATOR [HANDWRITTEN: LEO]

DATE [HANDWRITTEN: 10-3-78]

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THIS MICROFILM IS
THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

[SEAL: DEPARTMENT OF DEFENSE UNITED STATES OF AMERICA]

MICROFILMED BY
NPPSO-NAVAL DISTRICT WASHINGTON
MICROFILM SECTION

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

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[HANDWRITTEN: ENTEMEDOR (SS-340)]
[HANDWRITTEN: WWII PATROL FILE]
[HANDWRITTEN: ALL MATERIAL ON THIS REEL IS DECLASSIFIED]

[HANDWRITTEN: J.A. KOONTZ]

— page 3 —
Office of Naval Records and History
Ships' Histories Section
Navy Department

HISTORY OF THE USS ENTEMEDOR (SS 340)

The USS ENTEMEDOR (SS 340), so christened according to the Navy
custom of naming these vessels for denizens of the deep, was named
for an electric ray found in the waters off Mexico. It is one of the
last submarines built under the mass production schedule of the Elec-
tric Boat Company, Groton, Connecticut, the keel having been laid in
the Victory Yard on February 3, 1944.

The undersea craft was launched on December 17, 1944; sponsored
by Mrs. E. V. Izac, wife of Representative Edouard V. Izac, member of
House Naval Affairs Committee.

The ENTEMEDOR was partially outfitted at the Victory Yard but upon
the closing of that yard, was completed at the main yard and presented
for delivery April 6, 1945. When she was commissioned April 6, 1945,
Lieutenant Commander William R. Smith, Jr., USN, took command of the
vessel.

After a shakedown and training period, the ENTEMEDOR was ready for
sea by the middle of May and on the 21st of that month sailed to Panama
for transit of the Canal. She was the first submarine, during World
War II, to leave New London, Connecticut, with no U-boat menace to
avoid in Atlantic waters.

After training at Balboa, Canal Zone; the voyage to Pearl Harbor,
Territory of Hawaii, was begun on June 12, 1945. The sub arrived at
Hawaii on June 29th and in order to make room for the returning Japan
Sea raiders at the submarine base, sailed for Midway Island for her
voyage repairs and advanced training.

Ready for her maiden war patrol on July 24, 1945, the ENTEMEDOR
sailed for Marcus Island to take up lifeguard and patrol duties.
Fourteen days in the waters of this area witnessed two B-29 raids and
brought about the eventual boarding and inspection of a Japanese
hospital ship by the USS CASSIN.

Ordered to leave Marcus for onward routing to patrol off the Jap-
anese Empire, the SS 340 left for Saipan on August 14, 1945; arriving
at her destination during the Armistice period on August 17, 1945.

She left Saipan two days later to join the Southwest Pacific
Force and arrived at Subic Bay, Luzon, Philippine Islands, on August
25th. On the 31st of August, with 17 other submarines and the tender,
USS HOWARD W. GILMORE, the ENTEMEDOR sailed for Seattle, Washington,
via Pearl Harbor, making port at the West Coast on September 22,
1945.

The submarine spent three months in those waters and having been
incorporated into Submarine Division 72 of Submarine Squadron 7, left
for duty at Subic Bay, P. I., on January 2, 1946. The vessel sailed
from Subic again on March 12th for Pearl Harbor, T. H., and San Diego,
California, and upon arrival at the latter port entered upon a train-
ing period in those waters which lasted until December 1946.

— page 4 —
- 2 - (USS ENTEMEDOR)

After a 90 day availability period at the conclusion of training,
at San Francisco, California, the ENTEMEDOR departed on March 18, 1947,
and conducted pre-patrol training until April 25th. On this date her
first post war patrol began and she was routed from Pearl Harbor to
Subic, P. I., via Truk, Lamotrek, Equator, Sibitu Passage and Mindoro
Strait. She departed Subic on the 5th of June for Hong Kong and left
Hong Kong five days later to proceed to Tsingtao, China. She arrived
at Tsingtao on June 14, 1947 where she engaged in training operations.
The vessel returned to the United States, via Okinawa and Pearl Harbor,
arriving at San Diego on August 21, 1947.

The ENTEMEDOR engaged in local training operations in the San
Diego area until 17 June 1948.

On June 12th, 1948, Lieutenant Commander Keith G. Nichols, USN,
relieved Commander William R. Smith, Jr., USN, as commanding officer.

The ship proceeded to San Francisco on June 17th, 1948, to engage
in a two weeks cruise training Naval Reserve personnel.

On July 6, 1948, the ENTEMEDOR entered the Mare Island Naval Ship-
yard, San Francisco, California, for regular overhaul and inactivation.
By Directive dated June 1948 the ENTEMEDOR was to be placed out of
commission, in reserve, attached to the U. S. Pacific Reserve Fleet.

* * * *

STATISTICS

LENGTH 312 feet
BEAM 27 feet
DISPLACEMENT 1,525 tons
SPEED 20 knots

Compiled: October 1950
Restencil: October 1950

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[HANDWRITTEN: 1542 A16-3]

SS340/A16
Serial 015

U.S.S. ENTEI EDOR (SS340)
Care of Fleet Post Office,
San Francisco, California.
August 26, 1945.

[STAMP: DECLASSIFIED I A L]

From: Commanding Officer, U.S.S. ENTEI EDOR (SS340).
To : Commander in Chief, United States Fleet.
Via : Official Channels.

Subject: U.S.S. ENTEI EDOR (SS340), Report of War Patrol
number One.

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

1. Enclosure (A), covering the First War Patrol of this
vessel conducted in the MARCUS ISLAND area during the period July
24, 1945 to August 26, 1945 is forwarded herewith.

[SIGNATURE: W. R. Smith]
W. R. SMITH, Jr.

DECLASSIFIED ART. 0445, OPNAVINST 5510.1C
BY [HANDWRITTEN: OPBPC] DATE [HANDWRITTEN: 5/26/22]

[STAMP: DECLASSIFIED]

11 0175

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U.S.S. ENTEMEDOR (SS340)

(A) PROLOGUE

The U.S.S. ENTEMEDOR was launched December 17, 1944 at Electric
Boat Company, Groton, Connecticut. Commissioning took place on April 6,
1945 and on April 8, 1945 ENTEMEDOR reported for duty. After forty-six
days of reconversion and training departed New London, Conn. on May 21,
1945 for Panama direct. Completed transit of Canal arriving Balboa May
30, 1945. Conducted five days of intensive training during which time
26 torpedoes were fired. The training received here is considered to be
the finest available at any station. The chance to shoot torpedoes, a
fast flexible operating schedule, perfect weather and sea conditions
with an able, alert, and interested staff of officers commanded by
Captain Johns made this training period most profitable. Reported to
Cincpac and departed Balboa in company with U.S.S. CATFISH on June
12, 1945. Conducted daily training enroute Pearl Harbor arriving and
reporting to Commander Submarine Squadron Ten on June 29, 1945. Depart-
ed Pearl Harbor on June 30, 1945 arriving Midway for voyage repairs and
training under ComSubRon 14 and U.S.S. BUSHNELL on July 4, 1945. Major
work accomplished included making three soft patches watertight, trying
to check hydraulic periscope leaks and installing new equipment. Con-
ducted eleven operational days training under the able guidance of
Commander T.J. Nelson. Conducted special exercises and completed a
thorough training for war patrol.

Recapitulation of training since Commissioning:

Dives                               244
Hours submerged                     149.6
Torpedoes fired                      43
Practice approaches                 160
Battle surface firing                 4
Total operational days               69

(B) NARRATIVE

Departed MIDWAY, T.H. at 1800(I) July 24, 1945 for patrol.

Officers and Chief Petty Officers aboard:
                                                    No. previous patrols
NAME
F.R. SMITH, Jr.         Lt.Comdr., USN                  8
L.H. OSTLUND            Lieutenant USN                  5
H.J. MESSICK            Lieutenant USN                  6
C.V. BARNES             Lieutenant USNR                 4
A.J. NELSON             Lieut.(jg) USN                  7
*C.H. HAGEMEIER         Lieut.(jg) USNR                 0
F.J. CALLAHAN           Lieut.(jg) USNR                 0
R.J. DZIKOWSKI          Ensign     USN                  0
B.H. PILOTZ             Ensign     USNR                 0

-1

11 0175

— page 7 —
U.S.S.ENTELEDOR (SS340)

(B) NARRATIVE (Cont'd)

NAME                                          No. previous patrols
J. VALANT                 CGL                      0
H.L. JENKINS              CTN                      5
J.G. HOFFMAN              CRM                      8
A.A.SCHWAB                CMoMM                    3
G.M. KVALHEIM             CMoMM                    7
W.C. HEERLEIN             CEM                      5
C.C.LISIECKI              CMa                      7
P. ZIMMERMAN              CMoMM                    9
W.E.MULVANEY, Jr.         CY                       8

*Reported aboard June 30, 1945 at Pearl Harbor.

                       July 24, 1945

1800 (Y) Departed MIDWAY, T.H. with air escort in accordance with
         CTG 17.5 OpOrder #27-45 of 24 July.

1845 (Y) Air escort departed.

2055 (Y) Radar contact KURE ISLAND 55,000 yards on SV radar. Closed
         Island for radar test requested by Comtaskgroup 17.5

2151 (Y) Submerged for trim divo.

2225 (Y) Surfaced.

                       July 25, 1945.

0142 (Y) Completed radar test, resumed track course. Sent message to
         CTG 17.5

0307 (Y) Radar contact 17,000 yards. Exchanged radar calls with MIDWAY
         bound CERO; our name appeared to baffle them.

0346 (Y) Lost radar contact at 27,600 yards.

0656 (Y) Crossed International Date Line at 28°31' N.

                       July 26, 1945.

0800 (M) Set all clocks to zone -12 time.

1200 (L) Posit: - 28°-37' N - 178°-39' E.

1714 (L) Conducted training dive and drills.

                               -2-

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U.S.S. EL TELEDOR (SS340)

(B) NARRATIVE (Cont'd)

July 27, 1945.

0858 (H) Submerged for trim, fire control drill, and general drills.
1017 (L) Surfaced.
1200 (L) Posit: 28°-59' N - 172°-44' E.
1543 (L) Conducted 40 & 20 MM and 50 cal. MG practice.

July 28, 1945

Conducted training dives and fire control problems.
0900 (H) Changed clocks to zone -11 time.
1200 (L) Posit: 29°-30' N - 166°-30' E.

July 29, 1945

Weather became threatening. Barometer falling, wind hauled
around from east to south swells from south. Secured Ship
for heavy weather.

1200 (L) Posit: 29°-30' N - 160°-13' E.
1400 (L) Received baffling APR interception on 39-42 LCS, 50 cps,
22 microseconds, apparently steadying on for five minutes
then sweeping. Checked the books for known frequencies,
finally gave up considering joint zone, weather, distance
to land, and length of time contact was noticed (four hours)

July 30, 1945

Storm took charge of all drills today.

0600 (L) Changed all clocks to zone -10 time.
0915 (K) C/C to 195° into teeth of the sea.
0930 (K) Slowed to one engine speed. Cleared topside of all but minimum
watch and lashed the lookout. Speed of advance about 6 knots.
Sea heavy.

1200 (K) Posit: 28°-54' N - 155°-13' E.
1600 (K) Received typhoon warning for area west of 130°E !
2300 (K) Barometer rising, sea abating.

-3-

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U.S.S.ENTELLDOR (SS340)

July 31, 1945

Conducted training, dives and drills.
Posit: 25°-46' N - 154°-09' E.

1200(K) Sighted PBL. bearing 135°T range 40,250 yards. Not sighted by
        plane. Lost at 52,500 yards, bearing 165°T.

1827(K) Radar contact MARCUS ISLAND 29,750 yards bearing 195°T. just
        before sunset. Received SHAD who I presume is headed south,
        staying north until she is well clear.

August 1, 1945

0507(K) Dove to approach southern end of island. Closed to 8,500
        yards of a desolate looking, bleak island. No signs of activit.

1200(K) Posit: 24°-09' N - 153°-59' E.

1307(K) Surfaced, commenced patrolling at 25-30,000 yards range.
        Received lifeguard station rotation from CSP.

August 2, 1945

0512(K) Dove to look over west coast of island, conducted drills.
        No activity noted.

1120(K) Surfaced.

1200(K) Posit: 24°-01' N - 154°-02' E.

1225(K) Sighted and received IFF interrogation from PBL (RAINER)
        over Island. Tried VHF with no success. Closest range 21,000
        yards not sighted by plane.

1305(K) Plane departed to westward.

1448(K) Dove for drills.

1700(K) Surfaced.

August 3, 1945

0508(K) Dove to approach island from west and conduct drills.

1100(K) Surfaced.

1200(K) Posit: 24°-16' N - 153°-49' E.

-4-

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U.S.S. NTILEEDOR (SS340)

(B) NARRATIVE (Cont'd)

August 4, 1945.
1320 (K) Sighted MARINER. Established VHF communication. VHF receiver
           faulty. Heard plane on APT before VHF.
1415 (K) Fired 3 rounds 40 MM. test firing, conducted drills and
           school.
           Received word of raid over LALCUS tomorrow.

August 5, 1945.
0508 (K) Dove for trim and drill.
0734 (K) Surfaced, proceeding to station.
1030 (K) On station.
1058 (K) Sighted first of four B-29's, those struck singly. The first
           two laid nice patterns, the second two must have dropped de-
           layed action. Saw only one burst of AA fire. After last B-29
           went over saw LIBERATOR surveying scene. No inter communica-
           tion except IFF. Will look over damage tomorrow. Looked as
           though target was western point.
1200 (K) Posit: 24°-11' N - 153°-46' E.

August 5, 1945.
0433 (K) Dove to approach island for inspection - No observed damage,
           all structures seen previously were still standing.
1110 (K) Surfaced.
1145 (K) Radar contact, plane, not sighted; circled island, departed
           on 230°T.
1200 (K) Posit: 24°-03' N - 153°-57' E.
1600 (K) Dove for battle stations and fire control problem and at
1730 (K) Surfaced.

August 6, 1945.
0439 (K) Submerged to look at island for damage.
1047 (K) Sighted MARINER plane over island.
1105 (K) Surfaced.

-5-

— page 11 —
U.S.S. ENTELEDOR (SS340)

(B) NARRATIVE (Cont'd)

1200(K) Posit: 24°-20' N - 153°-44' E.

1241(K) Sighted LIBERATOR over island.

1921(K) Converted #4 FBT to HBT.

        August 7, 1945

0508(K) Received message telling of raid today.

0706(K) Submerged.

0850(K) Surfaced.

0925(K) Sank oil drum by carbine and tommy gun.
        SV radar contact 29,000 yards 330°T, closed for high periscop
        look, tracked and at

1012(K) Submerged for identification and approach.

1034(K) Identified properly marked Japanese Hospital Ship, small,
        yacht type, clipper bow, diesel engines amidship, two masted
        HF radio equipped 225' vessel. Swung off track and opened
        range so as to surface, get to lifeguard station, and notify
        planes of ship approaching MARCUS. At

1355(K) Surfaced in rain squall and put four engines on line. Contact
        by radar and sight two LIBERATORS who received word on AH.
        Planes reported B-29's would be late. Looked like a race
        between the AH and planes hence an unfortunate incident might
        arise. Figured AH would be at MARCUS about 1400. Planes were
        notified.

1200(K) Posit: 24°-22' N - 153°-34' E.

1215(K) Sent Serial One to CSP.

1332(K) Sighted 12 B-29's riding high; AH about 6 miles away. Planes
        bombed island and AH turned up some beautiful black smoke and
        did a quick turn around. Was he surprised!. Came at a good
        time for he might be just in time for a full load of Japs.
        Bombing not too good today. Lots of water spouts.

1600(K) Tracked AH in rain squall into island and took station to
        observe.

        -6-

— page 12 —
U.S.S. ENTELLDOR (SS340)

(B) NARRATIVE (Cont'd)

1710(K) Radar pip separated from land and AH bore 337°T, 31,750 yards,
        headed for Empire. Set course to trail. Speed of AH 9 knots,
        course 308°T.
2135(K) Cleared message #2 to CSP with 2000 posit of AH.
2400(K) Having been ordered to stay in area reversed course and
        headed for MARCUS leaving our friend to the U.S.S. CASSIN.

August 8, 1945

0330(K) Regained radar contact on MARCUS 50,000 yards 129°T.
0538(K) Submerged to look closely at island.
0659(K) Sighted LIBERATOR over island.
1155(K) Sighted MARINER over island.
1200(K) Posit: 24°-11' N. 153°-56' E.
1231(K) Surfaced in rain squall 13,500 yards from MARCUS and opened
        out.
1515(K) Radar contact plane 25 miles closing. Sighted PRIVATEER at
1518(K) and held VHF confab about Japanese AH. This plane was a
        search plane for our contact.

August 9, 1945

0452(K) Submerged for looksee on north and northwest of island. Closed
        to 5,000 yards. No activity.
0751(K) Sighted MARINER over island.
1150(K) Surfaced and learned the news of RUSSIA declaring war. Wish
        I could see the faces of those bypassed MARCUS Japs.
1200(K) Posit: 24°-24' N. - 153°-43' E.
1620(K) Dove for fire control problems.
1714(K) Surfaced.

-7-

— page 13 —
U.S.S. ENTELEDOR (SS340)
(B) NARRATIVE (Cont'd)

August 10, 1945
0620(K) Radar and visual contact on plane, MARINER over island.
1200(K) Posit: 24°-04' N - 153°-55' E.
1334(K) Submerged for fire control problems.
1537(K) Surfaced.

August 11, 1945
0842(K) Dove for trim and training.
0947(K) Surfaced.
1200(K) Posit: 24°-06' N - 154°-05' E.
1800(K) For last three days have been circling island at ranges varying
       from 10,000 to 30,000 yards. For fear of wearing a rut in the
       ocean changed to a southerly course.

August 12, 1945
0515(K) Regained radar contact on island and commenced circling.
0950(K) Sighted MARINER over island.
1145(K) Sighted LIBERATOR over island.
1200(K) Posit: 24°-22' N - 153°-45' E.

August 13, 1945
0610(K) Submerged, conducted drills.
0920(K) Surfaced.
1010(K) Sighted delapidated Jap life jacket.
1200(K) Posit: 24°-17' N 153°-42' E.
1406(K) Radar contact aircraft 34,000 yards 290°T sighted MARINER.
1740(K) Sank oil drum.

-8-

— page 14 —
U.S.S.ENTELEDOR (SS340)

(B) NARRATIVE (Cont'd)

                       August 14, 1945

0532(K) Submerged for drill.
0835(K) Surfaced.
1110(K) Picked up 25 man U.S.life raft. Brought alongside for future
         gun drill.
1152(K) Sighted and had radar contact on CORONADO and B-24.
1200(K) Posit: 24°-24' N - 153°-44 E.
1541(K) Set large can on raft, manned gun stations and blazed away,
         radar control.
1610(K) Set course 184°T, speed 3 main engines departed station.

                       August 15, 1945

Enroute SAIPAN.
1107(K) Received word "Cease Firing".
1200(K) Posit: 19°-01.5' N 153°-16' E.
1328(K) C/C to 262°T.

                       August 16, 1945.

Enroute SAIPAN.
1200(K) Posit: 18°-02' N - 147°-15.5 E.

                       August 17, 1945

Enroute SAIPAN.
0224(K) Rendezvous with U.S.S. DRAGONET.
0536(K) Radar contact escort SC1318.
0612(K) Set course for SAIPAN.
1143(K) Moored alongside U.S.S.ORION.

                       August 18, 1945

Voyage repairs, SAIPAN.

                               -9-

— page 15 —
U.S.S. ENTELEDOR (SS340)

(B) NARRATIVE (Cont'd)

                                                                August 19, 1945

1426(K)         Underway from alongside U.S.S. ORION after a very pleasant
                sojourn. Operating in accordance with CTG 17.7 Oporder 13-45
                enroute Southwest Pacific area for duty. In company with
                Pearlbound MAPIRO and DRUM. escort LCI 1062.

1842(K)         Released escort and departed company with MAPIRO and DRUM.

2059(K)         Radar identification established with U.S.S. PERCH, south-
                bound.

2200(K)         Radar identification with U.S.S. SENNET and GAR northbound.
                Sighted.

                                                                August 20, 1945

                Numerous plane contacts by radar and visual.

                Changed time to zone minus nine.

1100(K)         Posit: 14-09 N - 141-04 E.
1200(I)         Dove for drill and trim..

                                                                August 21, 1945

1200(I)         Posit: 16-33 N - 136-10 E.

1450(I)         SV radar contact 225°T range 55,000 yards. Three pips,
                closest range 27,000 not sighted visibility hazy. Course
                about 310° speed 18 knots. Show friendly IFF.

1800(I)         Seas and wind increasing.

                                                                August 22, 1945

                Stormy weather.

1200(I)         18°-51 N. 131-26 E. DR position.

                                                                -10-

— page 16 —
U.S.S.ENTEMEDOR (SS340)

(B) NARRATIVE (Cont'd)

August 23, 1945

0053(I) SJ identification with east bound TUNA
0700(I) Set clocks to conform to zone minus 8 time.
         Numerous aircraft contacts on radar, sighted one. Manned.
         VHF and 500 kcs. Typhoon weather.
1155(H) Gunners mate injured on bridge, possible contusion of head,
         possible fracture of left leg.
1200(H) Posit: 21°-31' N, 125°-12 E. DR only.
1800(H) Reported to Comtaskfor Seventy-One for duty.
2200(H) Storm abating.

August 24, 1945.

0127(H) Received CTF 71 Serial 57.
0830(H) Discovered we were 53 miles from DR position; Some storm.
1200(H) Position: 21°-38' N 121°-49' E.

August 25, 1945.

         Numerous aircraft contacts, friendly. Sighted several.
         No communication - not sighted.
1200(H) Position: 18°-52' N - 118°-47' E.

August 26, 1945.

Arrived SUBIC BAY.

(C) WEATHER

         No unusual weather conditions were encountered.
         General conditions: Wind of force 2-3, prevailing easterly,
         state of the sea 1-2, 60% overcast.

(D) TIDAL INFORMATION

         A current of slightly more than one-half knot in a northerly
         or north-easterly direction was more-or-less consistent
         throughout the period of the patrol.

-11-

— page 17 —
U.S.S. ENTEREDOR (SS340)

(E) NAVIGATIONAL AIDS
Three radar towers on MARCUS ISLAND, 110 feet in height, are visible to
32,000 yards in clear weather. SV radar could be depended upon at any time
to ranges up to 36,000 yards.

(F) SHIP CONTACTS
None.

(G) AIRCRAFT CONTACTS
None.

(H) ATTACK DATA
None.

(I) MINES
None.

(J) ANTI-SUBMARINE MEASURES AND EVASION TACTICS
None.

(K) MAJOR DEFECTS AND DAMAGE

Shortly after leaving Panama, No. 1 periscope developed excessive oil
leakage between the cylinder and piston to the overflow tank in the Control
Room, when raising the periscope.
During voyage repairs of this vessel at MIDWAY, the Repair Force of the
U.S.S. BUSHNELL found that the port cylinder was tapered .010 inches in 19
feet. In view of this, a double ringed piston was installed which has re-
duced the amount of oil leaking past the piston, but has not entirely re-
medied this defect. It is believed that only a new cylinder with matched
piston will eliminate this excessive leakage.

Ventilation

This vessel was accepted by the Government with the ventilation system
deficient in capacity output. It is recommended that a larger supply blower
or a booster blower be installed. At present, the supply blower is operated
in an overloaded condition as recommended by Supervisor of Shipbuilding,
Electric Boat Company, Groton, Connecticut.

Engineering

After 1195 total hours, and 411 hours since renewal, the cylinder head
holding down studs on #2 unit of #1 engine sheared causing the studs to the
exhaust elbow (lower end) to shear and crack the cylinder liner.

-12-

— page 18 —
U.S.S. TILEDOB (SS340)

(L) RADIO

Fox Reception

Very little trouble was experienced receiving NPN. No jamming was
encountered, although CW and Voice transmission were often heard in the
background; on 4 August Japanese CW completely blocked 13655 kcs, but
was not heard on 6045 kcs. In general, 6045 kcs was best at night, 9050
in the morning and evenings, and 13655 during the day.
The RAL and the RBS were used interchangeably, although at times
atmospheric interference necessitated the use of both on different fre-
quencies.

Transmission

Six transmissions were made. The first, 251350 July, was made with
no difficulty upon departing MIDWAY. The other five, all to ComSubPac,
were delivered to NPN with varying degrees of success. Serials One and Two
were sent easily, after 8470
kcs failed, despite the IRPL. Serial Three went out on 12705 kcs easily, after 8470
kcs failed, despite the IRPL. Serial Four required two and an
half hours to transmit; 8470 kcs finally raised NPN, after 12705, 8470,
16940, 4235, and 12705 kcs had been tried in that order. During the call
up, NPN could be heard on 8470 and 12705, but, apparently, could not hear
us. The Sixth transmission, Serial Five, was sent with much difficulty
on 4155 kcs, cleared through NDP 13.

Air-Sea Communications

Reception on the VHF was disappointing, 25,000 yards being the maximum
dependable range. The aircraft could hear us far better, according to
their reports, than we could receive them.
No difficulties were experienced with procedure, although once a mixup,
shortly straightened out, occurred with two "Rootboers" in the area.

Material

The Communication gear suffered no major casualties or defects.

(M) RADAR

SV:

Major troubles

1. Shorted C53 in range indicator. Symptom: No range stop.
2. Gassy 3B24 in PPI. Symptom: F3 and F4 burned out.
3. Very good (+ 2 volts) voltage regulation needed for power supply.
-13-

— page 19 —
U.S.S. ENTE EDOR (SS340)

(M) RADAR (Cont'd)

Comments on design

Very well designed for maintenance and tuning. One man can make all
tuning adjustments at the transmitter-receiver. Routine daily checks
on meter readings provide excellent indication of equipment performance.

Sample ranges

Midway Island - tracked to 70,000 yards.
Kure Island - picked up at 55,000 yards.
Submarine - initial contact at 17,750 yards; tracked to 27,100 yd
Aircraft - initial contacts at 20,000 to 45,000 yards.Tracked
to 70,000 yards maximum.

SJ-ST

Major troubles

1. Soldered connection at sliprings in antenna feeder unit broken loose.
   Symptom: No lobe-switching. The re-soldering job was difficult be-
   cause of the close quarters. The feeder unit should be redesigned to
   allow easier maintenance and cleaning. Note: The feeder unit had
   been torn down, serviced, and reinstalled during voyage repairs by
   the U.S.S. BUSHNELL.

2. Horizontal jitter of intermittent character in the "A" scope sweep.
   This trouble was present at beginning of patrol and still appears
   when gear is first turned on. Tightening of all cables, and replace-
   ment of the 705A in the Transmitter-Receiver and of the 2X2 in the
   range indicator have materially reduced the frequency of occurrence
   of this trouble.

3. Free running multivibrator - V14 in Range Indicator. Symptom:
   multiple transmitter pulse on precision sweep.

4. Vertical jitter of sweep on "A" scope for both SJ and ST. Replaced
   pre-IF tubes in ST selector unit.

5. ST very unstable during entire patrol. Required tuning every 1-2
   days. This gear should be redesigned to incorporate the tuning ease
   of the SV. SV and SJ radar show mutual interference when turned on
   at same time.

-14-

— page 20 —
U.S.S.ENTELLEDOR (SS340)

(N) SOUND GEAR AND SOUND CONDITIONS

     All gear operated satisfactorily during the entire patrol with
the following exceptions:

     At higher speeds when submerged, the SP shaft vibrated very
noisily when the hydrophone was trained between 165 and 195 degrees.
     The Radio Technician carried out routine maintenance and checks.

(O) DENSITY LAYERS

     The area around MARCUS was consistently uniform with regard to density
layers. The descent was isothermal to the vicinity of ninety feet where
a layer of about six degrees width could be expected. From ninety feet
to four hundred feet, the slope was constant at six degrees per hundred
feet.
     The ENTELLEDOR is equipped with an experimental Bathythermograph install-
ation in the Conning Tower with temperature element at the top of the
periscope shears, as well as the usual installation in Control Room with
temperature element at the bilge keel to port of #2 LBT. This is design-
to give maximum vertical displacement between temperature elements and
make it possible to "spot" the ship immediately below any density layer.

(P) HEALTH, FOOD, AND HABITABILITY

     (a) The health of the crew was generally good. One man was affected with
an infection on his right knee (cellulitis) which resulted in a loss of
twelve man days. There were five minor cases of boils which resulted in
no loss of time.

     (b) The food throughout the patrol was excellent, both in quantity and
preparation. Of 2000 pounds of potatoes drawn at MIDWAY, twenty five
percent was surveyed on receipt, and an additional twenty five percent
was surveyed upon departure from MARCUS.

(Q) PERSONNEL

     Vessel was commissioned with 51% qualified men, 31% having made
one or more war patrols. During an arduous training period the crew and
officers developed into a fine balanced team. It is my opinion that with
this crew and presented with the opportunity, ENTELLEDOR would have
proved a valuable war addition to the fleet. It is a pleasure to be
with such a fine, willing and able body of men.

-13-

— page 21 —
U.S.S.ENTEMEDOR (SS340)

(Q) PERSONNEL (Cont'd)

The officers, five of whom have made war patrols, possessed
a driving spirit that left nothing to be desired, their training
progressed to a fine state and I am proud to be with them.

(a) Number of men on board during patrol                                78
(b) Number of men qualified at start of patrol                           39
(c) Number of men qualified at end of patrol                             46
(d) Number of unqualified men making their first patrol                  38

One officer is considered Qualified in Submarines and is so
recommended.

(R) MILES STEAMED - FUEL USED

Mileage from MIDWAY to MARCUS                               1834     Fuel used 22611
Mileage on station                                          2434     Fuel used 16315
Mileage from MARCUS to SAIPAN                               1063     Fuel used 14000
Mileage from SAIPAN to SUBIC BAY                            2271     Fuel used 26000
Total Mileage                             7602     Fuel used 79926

(S) DURATION

Days enroute to area                                         9
Days in area                                                14
Days enroute to SAIPAN                                       3
Days enroute SUBIC BAY                                       7
Days submerged                                               0

(T) FACTORS OF ENDURANCE REMAINING

Torpedoes                 Fuel                 Provisions           Personnel Factor

16-Mk. 14-3A              66,500               60 days              60 days
6-Mk. 18-2
3-Mk. 27

-16-

— page 22 —
U.S.S. ENTEMEDOR (SS340)
(U) COMMUNICATION, RADAR, AND SONAR COUNTERMEASURES

Radar Countermeasures

APR CONTACTS

| Date    | LCT  | Ship's Position | Freq. PRF | Pulse Width   | Sketch                |
||------|||||
|         |      | Lat.      | Long.     | (mc) | (cps) | (microseconds)|                       |
| 7/29/45 | 1400 | 29-24 N   | 160-42 E  | 38   | 50    | 22            | [Sketch of a waveform]|
| 7/31/45 | 0600 | 26-27 N   | 155-37 E  | 82   | Fox scheds.from P.H. |               | [Sketch of a waveform]|
| 8/1/45  | 0030 | 23-58 N   | 154-53 E  | 96   | 600   | 25            | [Sketch of a waveform]|
| 8/5/45  | 1405 | 24-36 N   | 154-53 E  | 179  | -     | 4             | [Sketch of a waveform]|
| 8/15/45 | 0500 | 24-49 N   | 153-29 E  | 49   | 500   | 30            | [Sketch of a waveform]|

NOTE: The 96 mc. radar was on every night while we were in the vicinity of
MARCUS ISLAND.

Communication Countermeasures

No communication jamming was experienced.

Sonar Countermeasures

None.

(V) REMARKS

     Ventilation of fleet Submarines has long been a sore point on every
Submarine. During trials and tests of this vessel it was found the capacity
output of the supply blower, when taking a suction from outside, was
deficient. Subsequent tests on Sister Ships showed the same deficiency.
Nothing but a larger blower or a larger induction could solve this pro-
blem. Neither was attempted on this vessel but a speed-up of blower de-
sign speed was authorized. This motor becomes excessively hot as a
consequence.
     With the addition of more and more electronic apparatus in the Radio
Room, Control Room, and Conning Tower, nothing of a concrete nature has
been done about a change in ventilation design.
     It is hoped that during the early days of peace, that a more correct-
ly designed ventilation system will be forthcoming.

-1-

— page 23 —
FC5-22/A16-3
Serial: 0225
CONFIDENTIAL

SUBMARINE SQUADRON TWENTY-TWO Bn

Care of Fleet Post Office,
San Francisco, California,
30 August 1945.

From: Commander Submarine Squadron Twenty-two.
To : Commander in Chief, United States Fleet.
Via : (1) Commander Submarines, Southwest Pacific.
(2) Commander, Southwest Pacific.

Subject: U.S.S. ENTEMEDOR (SS340) - Report of First War Patrol.

1. The U.S.S. ENTEMEDOR (SS340) departed MIDWAY 24 July 1945 on her
maiden war patrol, Commander W. R. SMITH, U.S. Navy, Commanding. The patrol was
completed upon arrival in SUBIC BAY, P.I., on 26 August. Thirty-three (33) days
were spent at sea. Sixteen (16) days were occupied rendering life guard services
and patrolling in the vicinity of MARCUS Island. Voyage repairs and supplies were
received at SAIPAN from the U.S.S. ORION.

2. ENTEMEDOR witnessed numerous strikes, but fortunately the oppositi
was meager and her services were not required. On 7 August a Japanese Hospital
ship was sighted and reported to Commander Submarines, Pacific Fleet and approach
planes, thus averting a possible incident and facilitating eventual interception
by the U.S.S. CASSIN.

3. The wartime career of the ENTEMEDOR was cut short by the cessation
of hostilities, yet she can be proud to have had a small share in the great task
performed so well by the submarine service.

4. No refit is contemplated at this time, necessary services will be
provided by the U.S.S. HOWARD W. GILMORE.

5. The administration Squadron Commander is happy to welcome this
fine new submarine to the fleet and congratulates the Commanding Officer, officers
and crew of the U.S.S. ENTEMEDOR on a well conducted patrol.

[SIGNATURE: E. S. Hutchinson]
E. S. HUTCHINSON.

11 0175

— page 24 —
FE24-71/A16-3
Serial 0543-A
C-O-N-F-I-D-E-N-T-I-A-L
UNITED STATES NAVY
12a/hr
4 September 1945

SECOND ENDORSEMENT to:
USS ENTEMEDOR Conf. Ltr.
A16-3, Serial 0225, dated
30 August 1945. Report of
First War Patrol.

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

Subject: U.S.S. ENTEMEDOR (SS340) - Report of First War
         Patrol - Comment on.

1. The First War Patrol of the ENTEMEDOR under the com-
mand of Commander W. R. SMITH, U.S. Navy, was conducted in the
vicinity of MARCUS ISLAND rendering lifeguard services.

2. There were no opportunities for rescue work and
ENTEMEDOR was ordered to SUBIC BAY after voyage repairs were
accomplished at SAIPAN.

3. The Force Commander congratulates the Commanding
Officer, Officers and Crew of the ENTEMEDOR upon the completion
of this patrol and welcomes them to Submarines SOUTHWEST PACIFIC.

[SIGNATURE: James Fife]
JAMES FIFE.
ORIGINAL COPY.

DISTRIBUTION:

Cominch (3) Direct
Opnav (2) Direct
Opnav Op-23c (1)
ComlstFlt (1)
Com2ndFlt (1)
Com7thFlt (2)
ComSubslstFlt (30)
ComSubs2ndFlt (4)
CTF-71 (7)
CTG-71.5 (2)
ComSubPac Adcomd (1) (air mail)

[SIGNATURE: J.B. Miller]
J. B. MILLER,
Flag Secretary.

ComSubRon-22 (2)
ComSubRon-26 (2)
ComSubRon-30 (2)
DivComsSubRon-22 (1 ea)
DivComsSubRon-26 (1 ea)
DivComsSubRon-30 (1 ea)
S/M School, N.L. Conn. (2)
Comdt: NYD, Puget Sound (1)
SubAd, Mare Island (2)
S/Ms 7thFlt (1)

11 0175

— page 25 —
A16-3(F-3-2/ekb)
Serial: [HANDWRITTEN: 0253]

UNITED STATES FLEET
COMMANDER SEVENTH FLEET

[STAMP: REC NO F-415]
[STAMP: 11 0175]
[STAMP: REC. SHEET NO 19]

[STAMP: 3 OCT 1945]

CONFIDENTIAL

THIRD ENDORSEMENT to:
CO, USS ENTEMEDOR (SS340)
conf. ltr., serial 015 of
26 August 1945.

[HANDWRITTEN: 9-02584]

From: Commander SEVENTH Fleet.
To : Commander in Chief, United States Fleet.
Subject: U.S.S. ENTEMEDOR (SS340), Report of War Patrol
Number One.

1. Forwarded.

[SIGNATURE: J. H. Long]
J. H. LONG
By direction

[HANDWRITTEN: X]

— page 26 —
END OF REEL
JOB NO. [HANDWRITTEN: F108]

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THE PROPERTY OF
THE UNITED STATES
GOVERNMENT

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