11 November 1942:
Indian Ocean. SW of the Cocos Islands. HOKOKU MARU attacks Captain Willem Horsman's 6,341-ton Royal Dutch Shell tanker ONDINA and her escort, LtCdr William J. Wilson's, RINR, Australian-built minesweeper HMIS BENGAL at 19-45S, 92-40E. BENGAL closes the range with HOKOKU MARU to protect the tanker.
At 1545 (JST), HOKOKU MARU opens fire. Both ships are damaged in the ensuing action. AIKOKU MARU is 6 miles NW of the scene and closing. A lucky shot from ONDINA's 4-inch gun hits HOKOKU MARU's starboard torpedo tube which had just been loaded. After the ensuing explosion, a fire breaks out that rages out of control and reaches the aft magazine. More explosions follow that blow out her sides. At 1752, HOKOKU MARU sinks.