MV Wilhelm Gustloff was a German armed military transport ship which was sunk on 30 January 1945 by Soviet submarine S-13 in the Baltic Sea while evacuating German civilian refugees from East Prussia, Lithuania, Latvia, Poland and Estonia[3] and military personnel from Gotenhafen (Gdynia) as the Red Army advanced. By one estimate,[4][5] 9,400 people died, which makes it the largest loss of life in a single ship sinking in history.
Constructed as a cruise ship for the Nazi Kraft durch Freude (Strength Through Joy) organisation in 1937, she had been requisitioned by the Kriegsmarine (German navy) in 1939. She served as a hospital ship in 1939 and 1940. She was then assigned as a floating barracks for naval personnel in Gdynia (Gotenhafen) before being armed and put into service to transport evacuees in 1945.