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  Azumasan Maru (Deep Ruinin Wreck)

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USN October 16, 1942

Wartime History
The Azumasan Maru was used by the Japanese Navy during the Pacific War as a transport vessel.

On April 28, 1942 departed Truk as part of "Operation MO", the invasion of Tulagi and Port Moresby that includes Okinoshima (flagship of Rear Admiral Shima) escorted by minelayer Koei Maru escorted by destroyers Kikuzuki and Yuzuki, subchasers Toshi Maru No. 3 and Tama Maru No. 8, special duty minesweepers WA-1 and WA-2, Hagoromo Maru, Noshiro Maru No. 2 and Tama Maru.

On May 3, 1942 the invasion arrives in Tulagi Harbor and Azumasan Maru sucessfully unloads and anchors northeast of Tulagi. On May 4, 1942 at 8:15am, attacked by carrier aircraft from USS Yorktown CV-5 including TBD Devestators from VT-5 dropped aerial torpedoes but failed to score any hits.

During October 1942 departd on a supply run to Guadalcanal.

Sinking History
On October 15, 1942 Azumasan Maru sucessfully beached at Ruaniu near Bunani Point on the north coast of Guadalcanal but was immediately attacked by SBD Dauntless dive bombers and was set on fire and heavily damaged. Also beached and sunk was Sasako Maru and Kyusyu Maru. On October 16, 1942 B-17 Flying Fortress bombed the damaged vessel. During the night, she slipped off the reef and sank into deep water off Ruaniu.

During the 1970s, discovered by SCUBA divers upright and intact in excellent condition at a depth of 130' / 40m to the bow and 205' / 62m to the bridge. Locally known as "Deep Ruanui" wreck. Clear water brings in the larger pelagics and the bow gun is covered with soft corals.

Sometimes incorrectly referred to as "Asumasan Maru".
Combined Fleet - IJN AZUMASAN MARU:  Tabular Record of Movement

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Last Updated
October 23, 2019


130' bow
205' bridge

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