The Tokai Maru was a Japanese passenger-cargo ship built by the Mitsubishi Heavy Industries Shipyard that was sunk in Apra Harbor, Guam, in 1943, during World War II. It had served as a fast ship service between New York City and Japan for Osaka Shosen Co. before World War II; during the war it was used as a military transport ship for the Imperial Japanese Navy. In 1988 the wreck was placed on the National Register of Historic Places. The Tokai Maru was listed because of its association with World War II