HMS Porpoise (S01) was a Porpoise-class submarine of the Royal Navy. She was launched on 25 April 1956, commissioned on 17 April 1958, and was decommissioned in 1982. Finally, she was sunk as a target in 1985 in torpedo trials, for which purpose she was painted bright red. She had been used as a training target while still serving with the Navy; in 1979 her casing, ballast tanks and vents were reinforced so that unarmed torpedoes could be fired at her without the risk of sinking. In 2000, a glacier in East Greenland was named after her Commanding officers Accidents and incidents Notable accidents involving HMS Porpoise 18 October 1963: Suffers superficial damage departing Portsmouth harbor after colliding with the aircraft carrier HMS Centaur. 1 January 1969 - Entangled in the nets of the French trawler Belle Poule. 18 April 1982 - HMS Porpoise became entangled in the fishing nets of the Irish trawler Sharelga. The Sharelga, after travelling backwards two miles for twenty minutes, capsized and sank. References British Porpoise-class submarines Ships built in Barrow-in-Furness 1956 ships Ships sunk as targets Maritime incidents in 1985