Rio de Janeiro Maru 

             Truk Lagoon, FSM           



The Rio de Janeiro Maru was built in 1931 as a passenger ship for the Osaka Soshen Kaisha Line. Her peacetime duties consisted of passenger and cargo carriage on around the world route from Japan via Hong Kong, Singapore, South Africa, South America, US west coast and finally back to Yokahama, Japan.  The Japanese Navy took control of her in 1940 and converted her to a submarine tender. She was attached to the Combined Fleet and was responsible for servicing and supply of six submarines. After 1943, the Japanese had lost most of  their submarines, so Rio de Janeiro Maru was reclassified a transport and based in Truk.

During the "Hailstone" attack, Rio de Janeiro Maru was attacked by aircraft from the carrier USS Essex and hit with at least one bomb. She was reported on fire and thought to have sunk on the first day. She now lies in 130 fsw.

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