by the Italian torpedo boat Pegaso north east of Tripoli on 14 April 1942, although no debris was seen on the surface. The attack was 100 miles away from Wanklyn's patrol area; it is thought that he may have changed position to find more targets. It is also possible that the submarine was sunk by a mine on 11 April 1942 near Tripoli, when a submarine was reported as approaching a minefield. More recent research carried out by Italian naval specialist Francesco Mattesini points to a German aerial patrol supporting the same convoy, composed of two Dornier Do 17s and two Messerschmitt Bf 110s, which attacked an underwater contact with bombs two hours before the Pegaso incident. The author also asserts that the seaplane crew was unsure if the target they pinpointed to Pegaso was a submarine or a school of dolphins. Mattesini, however, admits the possibility that Pegaso could have finished off the submarine previously damaged by the German aircraft. Wanklyn was the Allies' most successful submariner in terms of tonnage sunk. Ships sunk See also List of people who disappeared mysteriously at sea Notes References Notes Bibliography Allaway, Jim. (1991) Hero of the Upholder: The Story of Lieutenant Commander M.D. Wanklyn VC, DSO**. Airlife, London. Clayton, Tim. (2012) Sea Wolves: The Extraordinary Story of Britain's World War II Submarines. Abacus, London. Gray, Edwyn. (1988) Captains Of War: They Fought Beneath the Sea. Leo Cooper, London. Hart, Sydney. (2008) Submarine Upholder. Amberley, Gloucester. Rohwer, Jurgen. Allied Submarine Attacks of World War Two: European Theatre of Operations, 1939–1945. Greenhill. Thomas, David. (1999). Malta Convoys 1940–42: The Struggle at Sea. Leo Cooper, South Yorkshire. Turner, John Frayn. (2008) Periscope Patrol: The Saga of the Malta Force Submarines. Pen and Sword, Barnsley. Walters, Derek. (2004) The History of the British U Class Submarine. Pen and Sword Maritime, South Yorkshire. Wingate, John. (1991) The Fighting Tenth. Leo Cooper, Penzance. 1911 births 1940s missing person cases 1942 deaths Royal Navy personnel killed in World War II British World War II recipients of the Victoria Cross Graduates of Britannia Royal Naval College Missing in action of World War II People from Kolkata People lost at sea Royal Navy officers of World War II Royal Navy recipients of the Victoria Cross Royal Navy submarine commanders Military personnel of British India British people in colonial India