B25 bombers US attack Japanese warships incl No.13 class submarine chaser HIJMS CH-39 (445-tons, 167 ft. aol, 16 kts, 1x76mm, 2x13mm) Off Three Island Harbor, New Hanover during World War II. February 16, 1944.
From Combined Fleet on the travels of the poor little CH-39:
16 February 1944:
Off Three Island Harbor, New Hanover in 02-24S, 150-06E. CH-39 is escorting cargo ship SANKO MARU towing a midget submarine. The convoy is attacked by Fifth Air Force B-25 “Mitchell” medium-bombers of the 500th Bomb Squadron of the 345 Bomb Group. The B-25s bomb, strafe and sink CH-39 and SANKO MARU (14 crewmen KIA) and damage the midget.
That same afternoon, B-25s of the 499th Bomb Squadron of the 345 Bomb Group find CH-39 sunk by the stern on a reef and abandoned, but the midget submarine is still on the surface. They bomb and strafe the midget and claim a sinking.
17 February 1944:
B-25s of the 500th Bomb Squadron return to the scene again and find the midget submarine still on the surface. They again bomb and strafe the midget and also claim a sinking.