After some time, "Wahoo" moved away to intercept the two fleeing ships. She decided to attack the tanker first since she was as yet undamaged. With only four torpedoes left, the submarine fired two at the tanker, the second hitting her just abaft of midships, breaking her back; she went down almost instantly. "Wahoo" then turned her attention to the freighter and fired her last two torpedoes without a spread. They both hit. Fifteen minutes later, the freighter sank, having absorbed four hits from three separate attacks. "Wahoo" then set a course for Fais Island. Postwar, JANAC credited "Wahoo" with only three sinkings: the transport, "Buyo Maru" (5,300 tons), "Fukuei Maru" (), and an unknown "maru" ().