Japanese records also reported that on 11 October, the date "Wahoo" was due to exit through La Pérouse Strait in the morning, "Wahoo" was bombarded from Cape Sōya. An antisubmarine aircraft (likely an " Aichi Jake" float plane) sighted a wake and an apparent oil slick from a submerged submarine. The Japanese initiated a combined air and sea attack with numerous bombs and depth charges throughout the day. "Sawfish" had been depth-charged by a patrol boat while transiting the strait two days before, and the enemy's antisubmarine forces were on the alert; their attacks fatally holed "Wahoo", and she sank with all hands. She was declared overdue on 2 December 1943 and stricken from the Naval Vessel Register on 6 December 1943.