On the night of 9 December, Lt. (jg.) John M. Searles USNR, in the "59", patrolling with "PT-44" at Kamimbo Bay, sighted an enemy barge. As the PT's opened fire on the barge, Searles saw a surfaced submarine. He quickly fired two torpedoes, one of which hit amidships. A geyser of water spouted high in the air, followed by tremendous explosions and a huge oil slick that spread for an hour and a half. It has been confirmed that Searles sank the submarine , a vessel long, of 1,955 tons standard surface displacement.