SS311/A16 Serial (013-44) CONFIDENTIAL Subject: U.S.S. ARCHER-FISH(SS311) - REPORT OF FIFTH WAR PATROL - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (H) 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 undermeath giving a visibility of about 15,000 yards. Tracking was accomp- lished on the surface and a submerged attack was on the carrier, Hayataka 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 stopped 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 -18- Enclosure (A) SS311/A16 Serial (013-44) CONFIDENTIAL Subject: U.S.S. ARCHER-FISH(SS311) - REPORT OF FIFTH WAR PATROL - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - good advantage in determining the disposition of the task force. We submerged on the target's track at 11,700 yards and sithted 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 funct- ioned perfectly and the torpedoes ran hot straight and normal. Tubes Fired #1 #2 #3 #4 #5 #6 Track Angle 108s 109s 109s 111s 111s 124s Gyro Angle 28R 31R 33R 38R 40R 55R Dept 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 0 Sec 8 Sec 8 Sec 8 Sec 8 Sec 25 Sec Type Spread Divergent Divergent Divergent Divergent Divergent Diver- gent. Sea Conditions Moderate Moderate Moderate Moderate Moderate Moder- ate. 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 P.H. P.H. P.H. -19- Enclosure (A)