The 1,931grt standard coastal freighter Gosei Maru was built in 1937 and requisitioned by the Imperial Japanese Navy in 1941. She was anchored off Uman Island in Truk Lagoon on 17 February 1944 as aircraft from the surprise U.S. Task Force 58 Operation Hailstone swept across the lagoon destroying Japanese fighter cover. She took an aerial torpedo hit from a USS Monterey torpedo bomber and began to roll over onto her port side. Being ‘light’ she sank quickly with no time for her lifeboats to be launched. She now rests on a steep slope with her stern in about 10 metres and her bow deeper in about 35 metres.

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