See USS YO-21 Shipwreck, Awalua beach, Lanai, Hawaii

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US Navy yard oiler YO-21, a massive Navy yard oiler that had been docked at Pearl Harbor during the 1941 attack. The YO-21 was 160-foot single-screw steel tanker with a triple expansion steam engine. the vessel was intentionally grounded by the military sometime in the 1950’s. YO-21 was built in Newburgh, New York by the Tank Shipbuilding Co. in 1918 and subsequently purchased by the US Navy. She was available for service by 1924 and assigned to the 14th Naval District at Pearl Harbor. According to Terence McComas’s Pearl Harbor: Fact and Reference Book, YO-21 was present during the attack, making her the fourth known Pearl Harbor vessel still in Hawaiian waters. By August 22nd 1946 the YO-21 had been judged surplus to navy needs and placed out of service. She was stricken from the Naval Register on December 30th of that year, and was turned over to the Naval Supply Center for salvage on July 30th 1947. It's located off Awalua Bay - 6 miles west of Shipwreck Beach.

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