On 24 August, the submarine again closed Manila Bay. At 06:45, she sighted masts; but heavy rain soon moved in and obscured the target. At 09:52, she launched two torpedoes. Her periscope began vibrating, hindering visibility and precluding the firing of two more torpedoes. At 09:54, an explosion was heard and the target, a small tanker, was seen to take on a five-degree list to port. "Saury" proceeded to to avoid detection by enemy air patrol units. At about 10:47, a bomb exploded close by the submarine. Depth charges followed and, at 11:50 and 11:52, two more bombs exploded.