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475 x 61 x 30
March 21, 1941
February 17, 1944
Lagoon of Lost Ships 1969
Patrick Colins c1990
Michael Barrett 2006
On March 21, 1941 the tanker visited San Francisco. Later in 1941, Hoyo was assigned to the Japanese Navy and attached to the Kure Naval District, for use as an oilier for the 4th Fleet. In Navy use, a triad kingpost added to the deck.
Attacked by a US submarine on December 19, 1942 at Lat 18 degrees, 55' N and 150 degrees 16' E. This claim can not be linked to a know American submarine activity. Afterwards, Hoyo Maru was based at Truk and supplied fuel to bases in the central Pacific.
On November 5, 1943 the tanker departed Truk for Palembang and Singapore. The ship was spotted the next day by USS Haddock and attacked from the surface with its deck gun and torpedoes at 7 degrees 54' N, 150 degrees 6' E. Fires were caused and flooding in the aft compartments, and the ship began to drift. 90 of the crew were rescued (13 wounded). By 1710, the fires were under control and was taken under tow back to Truk, arriving November 10.
On February 4, 1944, the Hoyo Maru was moored in an area for ships awaiting repairs by repair ship Akashi between Dublon and Fefan Island, and photographed by Allied photo reconnaissance. It was misidentified as being east of Dublon in another photo taken that same day.
The ship was photographed with the keel and stern above water. The ship remained in this position until the end of April, when it was again photographed. Since then, the wreck settled into deeper water.
The ship was heavily damaged when sinking, fires and capsizing. A large split is visible amidships, nearly 15' wide from bomb damage, the wreck can be entered through this break into the damaged engine room, also a lot of sediment. Collapsed deck structure prevents further exploration.
Ahead of the bridge is a paravane attached to the port side, and heavy silt in the forecastle, with rolls of cable and paint cans. The bow also has a 30' hole and a gun platform, the weapon is missing (possibly removed during repair and emplaced ashore). The damage the ship received before finally sinking was extensive. The wreck is dangerous to enter and there is lots of silt inside.
On June 28, 2006 the shipwreck was observed leaking oil and photographed by Michael Barrett. His photograph appears at "Pacific Shipwrecks Potentially Toxic Time Bombs".
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