Rio de Janeiro Maru – Passenger liner lying on starboard side. Huge stern gun, many beer bottles, several large gun turrets and gun barrels in holds. Nice engine room. Depth: 35-110ft/10-33m The Rio de Janeiro Maru was a 461ft/140m long ship with a gross tonnage of 9,626 tons. She was driven by twin screws with two 6-cylinder 2-stroke Mitsubishi Sulzer diesel engines. She could carry a complement of 150 crewmembers and 1,140 passengers. The word ‘Maru’ designates a merchant vessel. When built in 1930, the Rio de Janeiro Maru was constructed as an eight-deck passenger liner for one of the largest Japanese shipping companies, the Osaka Shosen Kabushiki Kaisha (O.S.K. Line). Widely known internationally since its founding in 1884, the company provided passenger and cargo service throughout the world. At the outbreak of World War II, the O.S.K. Line operated a fleet of 20 motor driven passenger ships.