The two vessels sank were the Japanese transport Shinroku Maru (2857 GRT) and damaged the Japanese transport Sugiyama Maru (4379 GRT) north-northeast of the Bonin Islands in position 31°06'N, 142°34'E. Immediately, depth charges began to drop, Whale cleared the area to the southeast and later received a report of a crippled freighter in tow 120 nautical miles north of her.