The Straitsman was a Bass Strait 720-ton roll-on/roll-off ferry livestock carrier which capsized and sank in the Yarra River, Melbourne, Australia, on 23 March 1974 while approaching her berth with her vehicle door partly open, with the loss of two crew members and many of her cargo of 2,000 sheep. The ferry was heading upstream at 6 knots (7 mph; 11 km/hr) when a crew member opened the stern door without the knowledge of the captain on the bridge.