Three days later, "Wahoo" sighted two ships hugging the shoreline on a northerly course, off the Benten Saki coast, and dove. She launched two torpedoes at the leading ship, followed immediately by a spread of four at the escort. The first torpedo hit the leading ship, "Tamon Maru #5", under the stack and broke her back; the second missed ahead. The escort successfully avoided all four torpedoes fired at her and then escaped. The "Tamon Maru" () sank, and "Wahoo" proceeded down the coast.