USS Archer-Fish War Patrol #5
30 October to 15 December 1944
Report and Endorsements

(UNCLASSIFIED)

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Patrol Report

Endorsements

Sailing List - Patrol #5


Patrol Report of U.S.S. ARCHER-FISH (SS-311)

 

SS311/A16-3                                                                   U.S.S. ARCHER-FISH (SS-311)

                                                                                         Care of Fleet Post Office

Serial ( 0l3-44 )                                                                 San Francisco, Calif.


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


                                                                                                                            15 December, 1941.


From :             The Commanding Officer.

To :                 The Commander-in-Chief, United States Fleet.

Via :                (1) The Commander Submarine Division 102.

                       (2) The Commander Submarine Squadron 10.

                       (3) The Commander Submarine Force, Pacific Fleet.

                       (4) The Commander-in-Chief, Pacific Fleet.

Subject :          U.S.S. ARCHER-FISH - Report of Fifth War Patrol.

Enclosure :       (A) Subject report.

                        (B) Track chart to Comsubpac only.


            1.        Enclosure (A), covering the fifth war patrol of this vessel conducted in waters of the
Japanese Empire south of Honshu during the period from 30 October, 1944 to 15 December, 1944, is
forwarded herewith.




                                                                                                            J.F. ENRIGHT.

(enclosure)

 

 

SS311/A16

Serial (013-44)


CONFIDENTIAL

Subject:           U.S.S. Archer-Fish (SS-311) - Report of Fifth War Patrol

---------------------------------------------------------------------------------------------------------------------------


                        Prologue:

September 29, 1944    Arrived Pearl Harbor completing 4th War Patrol. Assigned to Squadron Four for administration and Division Forty-Two for refit.

                                    Commander J.F. Enright relieved Commander H.W. Wright as C.O


October 14, 1944        Refit completed and the regular crew moved back aboard. The following items were accomplished:

                                        •Installation of Gould Trim Pump.
                                        •Slotted reflector for S.J.
                                        •Installation of Mk 8 TBTs (binoculars not available)
                                        •Installation of SPA radar detector.
                                        •Training Officer was Commander W.H. Brockman. An eight day
                                          training period was conducted including a convoy exercise.


                        Narrative:

October 30, 1944 

1330 (VW)      Departed Submarine Base for patrol in accordance with Comsubpac secret operation order 364-44 as modified by Comsubpac mailgram 302125

1700 (VW)      Trim dive.

1710                Surfaced.

1900                Released escort, PC 580, and increased speed to 18½ knots.

2217 (VW)      SJ radar interference bearing 240 T. Probably Snapper.


October 31, 1944

0525 (X)         Trim dive.

0540 (X)         Surfaced.

0735 (X)         SJ radar interference.

0740 (X)         Sighted friendly sub bearing 327 T. Probably Sea Horse.

1635 (X)         Sighted and exchanged calls with Skate.


November 1, 1944

0605 (X)         Trim diva.

0617 (X)         Surfaced.

1630 (X)         Sighted small sled target fired one magazine of 20 mm.


November 2, 1944

0718 (Y)         Received despatch from Comsubpac stating that special mission had been delayed and maximum speed longer required. Slowed to 3 engine speed.

1012 (Y)         Training dive.

1034 (Y)         Surfaced.

1230 (Y)         Crossed dateline. Changed date to November 3, 1944.


November 3, 1944

1455 (M)        Training dive.

1513 (M)        Surfaced.


November 4, 1944

1035 (M)        Training dive.

1304 (M)        Surfaced.


November 5, 1944

0630 (M)        Training dive.

0648 (M)        Surfaced..

1442 (L)          Training dive.

1454 (L)          Surfaced.

1615 (L)          Sighted and exchanged calls with Drum.


November 6, 1944

0550 (L)          Training dive.

0612 (L)          Surfaced.

1006 (L)          Training dive.

1123 (L)          Surfaced.


November 7, 1944

0300 (L)          SJ radar interference.

0630 (L)          Sighted and exchanged calls with Pampanito, Fell in with “Fennomints”.

0930 (L)          Training dive.

0935 (L)          Surfaced.

0937 (L)          Training dive.

0955 (L)          Surfaced.


November 8, 1944

0850 (K)         Pampanito submerged.

0851 (K)         Sighted plane coming in. Dived.

0921(K)          Surfaced.

1355 (K)         Sighted plane.

1356 (K)         Plane on SD and SJ - IFF response a PBM that did not approach closer than 8 miles.


November 9, 1944

0320 (K)         SJ contact and interference - 7500 yards. Later found to be Cod.

0625 (K)         Sighted escort.

1241 (K)         Pilot boarded.

1305 (K)         Entered channel at Saipan.

1334 (K)         Moored in nest alongside Fulton.

                        Change time to -9 all following times are Item.


                        Started voyage repairs. These included:

                                •Flooded cable to after TBT.

        •Replacing valve disc on stem of ice machine circulating water discharge valve.

                                •Patching corroded muffler.

                                •Cycling #2 periscope.


November 10, 1944    Voyage repairs continuing.

The officers were given a ride around the island which was most interesting and appreciated.

                        The men went ashore in walking parties under officer supervision to lessen the danger of booby traps                         which were still around. Four men who inadvertently became separated from the rest started through a                         cane field. When one of the men heard rustling where his friends were not, he called “Halt” in his best                         Marine voice. With that 3 Jap soldiers jumped and ran leaving a loaded rifle, bayonet, medical kit, K                         rations, etc. as souvenirs. It is very fortunate that we don't have four casualties.


November 11, 1944

1339                Underway in company with the “Fennomints” plus Scabbardfish. Escort departed at dark.


November 12, 1944

2000                Departed company with “Fennomints”.

2130                SJ contact 8700 yards. Probably Cero.


November 13, 1944

0505                Trim dive.

0545                Surfaced.

1054                SD contact. 8 miles. Closing. Submerged. Aircraft Contact #1.

1122                Surfaced.


November 14, 1944

0543                Trim dive.

0555                Surfaced.

2200                Received message to take life guard station in Hit Parade area.


November 15, 1944

0540                Trim dive.

0608                Surfaced.

1001                Sighted submarine on surface.

1015                Made quick dive, closing.

1044                Identified sub as friendly. Fired 2 smoke bombs, turned away and surfaced. With one of us using a Aldis lamp instead of a searchlight, and the other using a 24 hour old challenge, managed to exchange call with Trigger, part of Burt’s Brooms.

1519                Training dive.

1543                Surfaced.

1720                Sighted sub on surface bearing 270 T. - Probably another Broom.


November 16, 1944

0546                Made dive in area 5.

1708                Surfaced - SJ out of commission. No stars.


November 17, 1944

0013                SJ back in commission. Raid for today delayed.

0601                Quick dive.

1710                Surfaced.

2117                SJ contact 10,000 yards. This contact was soon lost and from size of pip, course and speed, was probably a small escort going to Hachijo Shima. Ship Contact #1.

2303                SJ contact 7500 yards.

                        Another single pip and probably a patrol boat. Avoided. Ship Contact #2.


November 18, 1944     No plane guard duties today.

0547                Quick dive.

1714                Surfaced.


November 19, 1944

0540                Quick dive.

1138                Surfaced on lifeguard station. Excellent visibility and no clouds.


1200                Sighted plane on easterly course along coast probably transport. Not sighted.

                        Aircraft Contact #2.

1235                Sighted another plane on same run as first. Probably Nagoya-Tokyo.

                        Aircraft Contact #3.

1313                Received message that raid was delayed.

1314                Dived.

1723                Surfaced.


November 20, 1944

0546                Quick dive.

1148                Surfaced on lifeguard station.

1154                Sighted 4 large bombers on southerly course - Not sighted. Aircraft Contact #4.

1503                Nothing on Aircraft frequencies. Decided raid again postponed. Submerged.

1721                Surfaced.


November 21, 1944

0550                Quick dive.

1145                Surfaced on lifeguard station.

1200                Sighted single engine land plane closing from 6 miles. Aircraft Contact #5

1220                Sighted 3 large bombers heading south again. Aircraft Contact #6.

1254                Surfaced.

1310                Notified no raid today.

1313                Submerged.

1715                Surfaced.


November 22, 1944

0540                Quick dive.

1110                Surfaced on lifeguard station for recco plane.

1217                Submarged.

1723                Surfaced.


November 23, 1944

0545                Quick dive.

1112                Surfaced on life guard station for recco plane.

1245                Submerged.

1723                Surfaced.

1900                Received message to work area until notified raid is on.


November 24, 1944

0545                Made quick dive on sea route between Ire Saki and Shioni Misaki.

1722                Surfaced.

1945                Patrolling during night along line between Ir0 Saki and Shino Misaki.


November 25, 1944

0553                Quick dive.

1708                Surfaced.


November 26, 1944

0554                Quick dive.

1125                Sighted mast on harizon. Headed toward.

1145                Three sets of masts. Ship Contact #3.

1153                Ships made out to be 2 trawlers and 1 subchaser. Too small for torpedoes and did not consider gun action warranted.

1200                Fishing group passed 2000 yards abeam. Secured from battle station.

1326                Surfaced for recoo plane.

1401                Quick dive.

1720                Surfaced.

1830-2000      Sent weather report.


November 27, 1944

0548                Made quick dive. Weather has changed radically since weather report last night. Sea is now force 5, completely overcast with low clouds.

1140                Surfaced on life guard station.

1245                Raid probably delayed because of weather. Due to low hanging clouds and possibility of plane approaching within 1000 yards without detection, submerged.

1330                Distant explosion - Maybe raid is on.

1335                Surfaced - Aircraft frequencies clear.

1355                Submerged.

1717                Surfaced.

1800                Heard on broadcast receiver that Tokyo was again bombed. Later notified by 17.7 that all planes returned safely.


November 28, 1944

0556                Submerged. No raid today.

1718                Surfaced.

2034                Sighted Inamba Shima. Distance about 12 miles but no radar contact.

2048                Radar contact 24,700 yards, 028° T. Started tracking from ahead. Ship

                        Contact #4.

2140                Identified target as aircraft carrier, base course 210, speed 20. It appeared he only had one escort. With sky overcast, and dark horizon to north, started surface approach on starboard flank.

2230                Escort on starboard beam sighted. Not possible to make surface approach on this side. Changed course back to his base course.

2250                Target group closing and we are off the track too far to submerge. Carrier turned on red truck light for about 10 seconds, then off for 20, and on again for 10. Range to closest escort 6100 yards and to carrier 15,000. Sent lookouts below and watched for gun flashes or splashes. Escort continued to ignore us - Called lookouts back.

2300                Enemy group now determined to consist of large carrier and 4 escorts. One on either beam, one ahead and one astern.

2330                Sent contact message.

2340                Looks like big zig in our direction.

2400                Probably a base course change to the west. We are now on his port flank further off the track than before. Changed our course to 270 and coaxed a few more turns from the already overloaded motors.


November 29, 1944 From here on it was a mad race for a possible firing position. His speed was about one knot              in excess of our best, but his zig plan allowed us to pull ahead very slowly.

0241                Sent second contact message when it appeared he planned to stay on 275 and not much chance of us reaching a firing position.

0300                Looks like another change of base course or big zig to southward. Range closing rapidly and we are ahead.

0305                Changed course to 100 and submerged. Range to carrier 11,700 yards. Sighted carrier in periscope at 7000 yards. Changed course 10° to left to keep from closing track too much. A small starboard angle on the bow and range 3500. Escort closed carrier to receive blinker message. This caused him to pass nicely ahead of us at 400 yards.

O316               Carrier zigged away about 30°. Picture improves. Good positIon, 70 starboard track, 1400 yards. Gyro shots necessary due to late favorable zig.

0317                Started firing all bow tubes, MK 14 torpedoes, set depth 10 feet - First gyro 28° right, track 100, spread from cards, aft to forward.

0317-47          Heard and observed first hit just inside stern near props and rudder. Large ball of fire climbed his side.

0317-57          Second hit observed and heard. This was about 50 yards forward of the first.

With hits seen, a destroyer about 500 yards on our quarter, and wakes visible, started deep.

Four more properly timed hits on our way down. The time corresponded to the firing interval and sounded the same as the two that were observed. The six hits with a spread can be explained by considering the data as correct, the overall spread from the card for 600 foot target is 10° and our target, 750 feet long is 10½° at 1400 yards.

                        The six hits are certain.

                        Breaking up noises started immediately.

With the bright moonlight the identification is quite accurate. The carrier appeared to be similar to the Hayntaka class except it is believed to had a raked stern. Perhaps our recco plane over Yokohama has a picture to further identify this one.

0325                Started receiving a total of 14 depth charges. Closest one was perhaps 300 yards away.

0345                Last depth charge. The hissing, sputtering, and breaking noises continued. At one time they covered 90° of scale on the sound receiver.

0405                Last breaking up noise. Our starboard sound head training gear damaged by a broken roller and a holding down lug. Either from depth charge or pressure. Both training motors grounded out by bilge water as it was necessary to use a 10° up angle. Credit is claimed for a sinking because of these items:

                                    (a) Six certain hits. (2 observed)

                                    (b) Heavy screws stopped and did not restart.

                                    (c) Loud breaking up noises for 47 minutes.

(d) Escorts give us slight attention and closed carrier, probably picking up

                                          survivors.

0610                Daylight and first periscope observation. Nothing in sight.

1000                Large and distant single explosion. Origin indefinite - Our target by all rights should have been down long ago.

1722                Surfaced.

1830                Started sending weather report and info on attack.

2000                Notified strike is on for tonight.


November 30, 1944

0551                Quick dive.

1718                Surfaced.


December 1, 1944

0554                Made quick dive in vicinity of attack.

0650                Sighted one trawler and one sub chaser. Probably looking for survivors which is our intent. Ship Contact #5.

0810                Broached in rough seas to 30 feet while getting periscope observation. Sighted Otori class TB, range 8000 yards, on opposite course. Ship Contact #6. Pinging detected. We were fortunately not sighted as it would not be possible to touch his 6 foot draft in these seas.

1725                Surfaced.


December 2, 1944

0550                Quick dive.

1720                Surfaced. Started for new lifeguard station. While passing between Hachijo and Aoga there was considerable radar interference on 82,150,155, and 192 mcs. The radar was strong and according to the APR it steadied on us a number of times. Occasional keying of the SD located no planes.


December 3, 1944

0545                Quick dive.

1009                Surfaced on lifeguard station.

1337                Considerable high pitched “yapping” on Tokyo broadcast

                        station, sirens, and bells. Planes are over the target.

1547                Received message from plane requesting aid. Started for position at full speed.

1607                Plane reported emergency over. Slowed.

1615                APR interference on 192 mcs. Possible IFF response - Cut in our BK and searched with SD. No contact.

1630                Received another plane call for assistance. Changed course and speed to head for him. Full speed in these seas gave us 10 knots. Took considerable water in the main induction, in fact, more than we intended and the auxiliary generator was grounded out.

1656                Another message from plane requesting assistance. Notified him we received his message and got a “Roger”. As we were closer to the first reported position, continued on.

2000                Started search at first reported position.

2135                Sent message on downed plane and our plans.


December 4, 1944

0025                This search to be taken over by Scabboardfish.

                        Started for position of second plane.

0550                Trim dive.

0617                Surfaced.

Continued search - used expanded square search, 6000 yards between tracks.

                        Size of seas determined assured sighting range.

1730                Sent weather report.


December 5, 1944      Continued search.


December 6, 1944      Continued search.

0745                Sighted plane 10 miles. Probably NELL. Submerged. Aircraft Contact #7.

                        155 mc radar interference.

0819                Surfaced.

1350                Sighted plane, 8 miles. TESS. Course north. Submerged. Aircraft Contact #8.

1423                Surfaced.


December 7, 1944      On lifeguard station.

0728                Submerged. Day raid canceled but night raid on.

1715                Surfaced.

1810                Sent weather report.


December 8, 1944

0747                Submerged for 155 mcs. radar interference - Clouds prevented sight contact. Aircraft Contact #9.

0846                Surfaced.

1243                Submerged. Planes should be well clear.

1703                Surfaced. B-29's due again tonight.

2327                Radar contact on two targets, 12,000 yards, commenced tracking.

                        Ship Contact #7.


December 9, 1944      From size of pips believed those to be two fair sized escorts returning to Tokyo, speed 13 knots

.                       and zigging. The fact that they were zigging indicates they believed themselves to be torpedo bait

0050                Targets sighted from bridge at 7000 yards. At 4000 yards and broadside the silhouettes were similar to destroyers but identification not certain. The moon which rose at 0010 was obscured by clouds most of the time so a periscope approach was not possible, and yet it was not possible to approach too closely on the surface.

0210-10          Fired 4 mark 14's at closest target from bow tubes with 100 track, small gyros, 3200 yard torpedo run. A 6 foot depth setting was used as it is doubtful if less than that could be used in the present sea.

0214-50          End of run explosions only. He was probably smaller than a destroyer and the torpedoes ran under.

0220                No sign that he knew of our presence. Tracked him at original speed. Did not make another attack as could see no way to improve the first attack.

0601                Submerged. No raid scheduled today and heavy low clouds.

1707                Surfaced.


December 10, 1944

0603                Submerged.

1008                Surfaced for recco plane.

1246                Single engine land plane sighted at 5 miles coming in. Aircraft Contact #10. Submerged. Recco plane should be well clear.

1705                Surfaced.


December 11, 1944

0603                Submerged.

1700                Surfaced.

1830                Sent weather report.

2024                Received message to head for Guam refit. Left Station.


December 12, 1944

0530                Passed between Sumisu Shima and Tori. Shima.

1058                Sighted masts on horizon 142°T.

1110                Identified as patrol boat on various courses. 6 miIes.

1116                Patrol boat disappeared to south.

1800-2200      Conducted test full power run. Average r.p.m. 285.


December 13, 1944

0605                Trim dive.

0616                Surfaced.


December 14, 1944

0220                SJ radar interference. Received challenge and sent reply by radar. Expect the Razorback.

0415                Lost interference - 7,900 yards closest contact.

0523                OOD sighted what appeared to be green smoke bomb, elevation 7°. Changed course in flare direction and ran for 8 miles. No contact - Proper recognition color but no boat surfaced and little chance of Razorback reaching position of bomb.

0600                Quick dive.

0615                Surfaced.

1243                SD contact 22 miles. Obtained IFF response at 18 miles.

1255                Plane not sighted until he closed to 2 miles. His elevation was about 4000 feet, and with scattered clouds it was very difficult to pick up the unpainted planes even though we knew he was near.

1256                Exchanged recognition signals by searchlight.

2323                SJ radar interference - 240°T. Possibly Sea Lion.


December 15, 1944.

0525                Sighted and exchanged calls with escort, AM-102.


                        Weather:

• No unusual weather conditions were observed. Overcast heavy weather with intermittent rain was the usual condition.


                        Tidal Information:

• No unusual tidal information can be added to found on the charts and coast pilot of the area.


                        Navigational Aids:

• No navigational aids were seen with the exception of Fujiama which on one exceptionally clear day was sighted at a distance of 110 miles.


                        Ship Contacts:

No.      Date                 Lat.                   Type               Initial            Estimated     How             Remarks

            Time (I)            Long.                                       Range           Course        Contacted

                                                                                                         Speed                                   


1.         17 Nov.           33-29'N           Probably         10,000                                 SJ

            2117               139-15'E          small escort

2.         17 Nov.           33-30'N           Probably         10,000                                 SJ

            2303               138-58'E           small escort 

3.         26 Nov.           32-27'N           2 Trawlers       8,000                                  Periscope

            1145               137-08'E          1 Subchaser 

4.         28 Nov.           33-33'N           1 CV               24,700             210°T         SJ                Sank 1 CV

            2048               138-45'E          4 DD                                        20 Kts 

5.         1 Dec.             33-13'N           1 Trawler         8,000                                  Periscope

            0650               137-28'E          1 Subchaser 

6.         1 Dec.             33-15'N           Torpedo Boat   8,000                                 Periscope

            0810               137-25'E          (Otori Class)

7.         8 Dec.             32-47'N           2 DD or           11,000             310°T         SJ                Fired 4 torpedoes

            2327               141-56'E          smaller                                     13 Kts                             believed passed under.

8.         12 Dec.           30-11'N           Patrol vessel     15,000                                High

            1058               138-36'E                                                                             Periscope


 

                        Aircraft Contacts:

No.      Time                 Lat.                   Type(s)            Initial            Est. C.         How             Remarks

            Date                 Long.                                        Range           Speed          Contacted                   


1.         1054                 27-30'N                                    8 mi.             East             R                 Dove

            13 Nov.            137-50'E         

2.         1200                 34-15'N           Transport          15 mi.           East             SD               Remained

            19 Nov.            138-25'E                                                                                               Surfaced

3.         1235                 34-15'N           Transport          15 mi.           East             SD               Probably

            19 Nov.            138-20'E                                                                                               Nagoya-Tokyo

4.         1154                 34-08'N           4 Bombers        10 mi.           Southerly      SD               Remained

            20 Nov.            138-10'E                                                                                                Surfaced

5.         1200                 33-50'N           Single engine     6 mi.                                 SD               Dove

            21 Nov.            138-08'E          land plane         Closing

6.         1220                 33-50'N           3 Bombers                            Southerly       P               

            21 Nov.            138-08'E           

7.         0745                 32-15'N           Nell                   10 mi.                               SD               Dove

            6 Dec.               142-10'E                                                                           155mcs (APR)

8.         1350                 32-20'N            Tess                  8 mi.                                                    

            6 Dec.               142-25'E          

9.         0747                 32-20'N                                                                              APR             Heavy O'cast

            8 Dec.               141-15'E                                                                            155(mcs)

10.        1246                 32-40'N           Single engine      5 mi.                                                     Dove

            21 Nov.            138-08'E           land plane         Closing

                                  R -    Radar

                                  SD - Sighted Day

                                  P -    Periscope


 

                       Attack Data:

U.S.S. Archer-Fish                 Torpedo Attack No. 1             Patrol No. 5

• Time: 0317              • Date: 11-29-44         • Lat: 32° N.               • Long: 137° E.

Target Data - Damage Inflicted

• Description: A task group of one large aircraft carrier and four destroyers was detected by radar at 24,700 yards.
The sky was overcast with a bright moon underneath giving a visibility of about 15,000 yards. Tracking was
accomplished on the surface and a submerged attack was made on the carrier, Hayatauka or Taiho
class “EC”.

• Ship sunk: One large aircraft carrier similar to the Hayataka class tonnage approximately 28,000.

• Damage determined by: Six torpedoes were fired from the bow nest. The first hit was heard and observed just inside
the carrier's stern. Second hit was heard and observed about 50 yards forward of the first. Four more properly timed
hits were heard while we were going to deep submergence to evade the escorts. Breaking up noises started immediately
and continued for 47 minutes. Credit is claimed for a sinking because of the following items:

            (a)       Six certain hits (2 observed)

            (b)       Heavy screws topped and did not restart.

            (c)       Loud breaking up noises for 47 minutes.

            (d)       Escorts gave us slight attention and closed carrier, probably picking up survivors.

• Target draft: 30 feet              • Course: 198              • Speed: 18                 • Range: 1400

Own Ship Data

• Speed: 3.5                • Course: 092              • Depth: 65'                • Angle:- 1° up

Fire Control and Torpedo Data

• Type Attack: This attack was a combined surface and submerged attack in that the approach phase was made on
the surface while the attack phase was made submerged. During the five hour tracking period both plot and the TDC
were manned continually, giving excellent results. The data computed by plot of the enemy?s base course was very
valuable in aiding the “end around”. The SJ radar was used both for tracking the target and detection; making a full
360° sweep on the 8000 yard and 40,000 yard scale once every three minutes. The “PPI” scope on the radar was used
to good advantage in determining the disposition of the task force. We submerged on the targets track at 11,700 yards
and sighted him through the periscope at 7000 yards. Both sound bearings and periscope bearings were used by the
TDC operator in maintaining a correct solution. Throughout the attack the fire control instruments functioned perfectly
and the torpedoes ran hot straight and normal.

Fire Control and Torpedo Data (Continued)

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

Track Angle                108s              l09s              109s             111s           111s             124s

Gyro Angle                  28R              31R                33R              38R           40R               55R

Depth Set                    10'                10'                 10'                10'             10'                10'

Power                          Hi                 Hi                  Hi                 Hi              Hi                  Hi

Hit or Miss                   Hit                Hit                 Hit                Hit             Hit                 Hit

Erratic                          No                No                No                No             No                No

Mk. Torpedo               14-3A           14-3A           14-3A           14-3A        14-3A          14-3A

Serial No.                    40009            40267           26405           40553        24373          24363

Mk Exploder               6-4                 6-4               6-4                6-4             6-4               6-4

Serial No.                    12134            19601           19299           2503           19259          19237

Actuation Set               Contact          Contact         Contact         Contact       Contact        Contact

Actuation Actual           Contact         Contact         Contact          Contact       Contact        Contact

Mark Warhead             16-1              16-1             16-1             16-1             16-1            16-1

Serial No.                     12939            17854          14952           16481          14916          20939

Explosive                      Torpex           Torpex         Torpex          Torpex         Torpex          Torpex 

Firing interval                8 Sec             8 Sec            8 Sec            8 Sec           8 Sec            8 Sec

Type Spread                Divergent        Divergent      Divergent      Divergent     Divergent       Divergent.

Sea Conditions             Moderate       Moderate     Moderate      Moderate    Moderate       Moderate

Overhaul Activity          S/M Base      S/M Base      S/M Base     S/M Base    S/M Base       S/M Base

                                    P.H.               P.H.              P.H. .           PH.             P.H.                P.H.