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  Rio De Janeiro Maru

9,626 Tons
461' x 62' x 26'
4 x 40mm

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Dan Carey 2000
Sinking History
On February 16, 1944 anchored in Truk Lagoon. During "Operation Hailstone" targeted by U.S. Navy (USN) carrier aircraft from USS Essex (CV-9) and hit by several 1,000 pound bombs and sunk into Truk Lagoon.

Located in 1978 and 1980 during fathometer searches, it is one of the deepest wrecks and very rarely dived. She carries large 6" deck gun above the forecastle. Its 15' barrel points downward. Below the gun is stored ammunition. Internal explosions blew debris through the deck in this area, probably shells exploding. The ship's name is clearly visible on the side of the bow. Large degaussing wires are around the hull to repel magnetic mines.

The No.1 hold contains artillery shells and debris. Large guns are in the second hold while winches and cargo equipment above. The galley contains china and in the bridge are "D" shaped portholes some with their glass still intact. Rear hold have only beer bottles, fuel drums and crew quarters. Another 6 inch gun is aft as well as her two large propellers. In the holds are guns, coal and beer bottles. Rio De Janeiro Maru was attacked during the day by a variety of planes on February 16, 1944 and sunk overnight.

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Last Updated
June 30, 2021


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