MV Wilhelm Gustloff was a German military transport ship which was sunk on 30 January 1945 by Soviet submarine S-13 in the Baltic Sea while evacuating civilians and military personnel from East Prussia and the German-occupied Baltic states, and German military personnel from Gotenhafen (Gdynia) as the Red Army advanced. By one estimate,[3][4] 9,400 people died, making it the largest loss of life in a single ship sinking in history.