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.

Tantalus served in the Far East for much of her wartime career. She sank the Malaysian tug Kampung Besar, and the Malaysian Pulo Salanama in April 1944; she went on to sink the Japanese army cargo ships Amagi Maru and Hiyoshi Maru, the Japanese cargo ship Hachijin Maru, the Japanese coaster Palang Maru, the Japanese fishing vessel Taisei Maru No. 12, a Japanese tug and three barges, an unknown Japanese vessel, and a Siamese sailing vessel, whilst claiming to have damaged a second. Tantalus also damaged a tug and the Japanese submarine chaser Ch 1. She also attacked, but missed the Japanese submarine I-166, which was sunk later that day by HMS Telemachus.

Tantalus survived the war and continued in service with the Royal Navy, finally being scrapped at Milford Haven in November 1950.^[1]

• Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8.
• Hutchinson, Robert (2001). Jane's Submarines: War Beneath the Waves from 1776 to the Present Day. London: HarperCollins. ISBN 978-0-00-710558-8. OCLC 53783010.

• IWM Interview with Hugh Mackenzie, who commanded HMS Tantalus from 1943 to 1945