In what year did the submarine that sank the Tsushima Maru open to public tours?
Tsushima Maru Tsushima Maru (対馬丸) was a Japanese passenger/cargo ship that was sunk by the submarine USS "Bowfin" during World War II, while carrying hundreds of schoolchildren from Okinawa to Kagoshima.
Soviet submarine S-13 S-13 was a "Stalinets"-class submarine of the Soviet Navy. Her keel was laid down by Krasnoye Sormovo in Gorky on 19 October 1938. She was launched on 25 April 1939 and commissioned on 31 July 1941 in the Baltic Fleet, under the command of Captain Pavel Malantyenko. The submarine is best known for the 1945 sinking of "Wilhelm Gustloff", a German military transport ship.