Early next morning an enemy plane spotted "Harder". The submarine soon sighted another destroyer searching the area for her. As before, "Harder" took the initiative as the enemy closed the range. The sub fired three torpedoes at short range, and two of them struck amidships, one detonating the ship's magazine with a tremendous explosion. "Hayanami" sank a minute later. Following the inevitable depth charge attack, "Harder" transited the Sibutu Passage after dark and steamed to the northeast coast of Borneo. There on the night of 8 June she picked up six Australian Coastwatchers, and early next day she headed once more for Sibutu Passage.