HMS Tantalus (P318)

HMS Tantalus in Plymouth Sound in August 1948
History
United Kingdom
Name	HMS Tantalus
Builder	Vickers Armstrong, Barrow
Laid down	6 June 1942
Launched	24 February 1943
Commissioned	2 June 1943
Identification	Pennant number P318
Fate	Scrapped in November 1950
Badge
General characteristics
Class and type	British T class submarine
Displacement	1,290 tons surfaced 1,560 tons submerged
Length	276 ft 6 in (84.28 m)
Beam	25 ft 6 in (7.77 m)
Draught	12 ft 9 in (3.89 m) forward 14 ft 7 in (4.45 m) aft
Propulsion	Two shafts Twin diesel engines 2,500 hp (1.86 MW) each Twin electric motors 1,450 hp (1.08 MW) each
Speed	15.5 knots (28.7 km/h) surfaced nine knots (20 km/h) submerged
Range	4,500 nautical miles at 11 knots (8,330 km at 20 km/h) surfaced
Test depth	300 ft (91 m) max
Complement	61
Armament	Six internal forward-facing 21-inch (533 mm) torpedo tubes two external forward-facing torpedo tubes two external amidships rear-facing torpedo tubes one external rear-facing torpedo tubes six reload torpedoes 1 x 4-inch (102 mm) deck gun three anti-aircraft machine guns

HMS Tantalus was a British submarine of the third group of the T class. She was built as P318 by Vickers Armstrong, Barrow, and launched on 24 February 1943. So far she has been the only ship of the Royal Navy to bear the name Tantalus, after the mythological Tantalus, son of Zeus.