Alexander Ivanovich Marinesko was a Soviet career naval officer. During the last year of World War II, he became known as the captain of the submarine S-13, which sank the German military transport ship Wilhelm Gustloff in the Baltic Sea in January 1945. Passengers included civilians and women and children being evacuated from East Prussia, in addition to military and related personnel. More than 9,300 of the more than 10,000 passengers and crew died.

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 Pyotr Malanchenko. The submarine is best known for the 1945 sinking of Wilhelm Gustloff, a German military transport ship/converted cruise ship. With a career total of 44,701 GRT sunk or damaged, she is the highest-scoring Soviet submarine in history.