Patrolling to the west of the island, "Saury" sighted her first enemy "maru" soon after 09:00 on 26 May; but the ship was too distant to catch. About an hour later, she abandoned the approach; then sighted a five-ship convoy on the port quarter. At 10:30, she fired tubes one, two, and three. One minute and 44 seconds later, a torpedo exploded against the stern of a transport. Nine seconds after that, another hit broke the target's back and sent debris high into the air. The 2,300-ton "Kagi Maru" went under. At 10:34, "Saury" went deep. By 10:38, nine depth charges had been dropped, but none was close.