Amphion-class submarine

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HMS Alliance at Gosport submarine museum
Class overview
Builders	Vickers Armstrong, Barrow-in-Furness Cammell Laird, Birkenhead Scotts of Greenock HM Dockyard, Chatham
Operators	Royal Navy
Preceded by	V class
Succeeded by	Explorer class
In service	1945 - 1974
Planned	46
Completed	16
Cancelled	30
Preserved	1
General characteristics
Type	Submarine
Displacement	1,385 tons surfaced, 1,620 tons submerged
Length	280.5 ft (85.5 m)
Beam	22.3 ft (6.8 m)
Draught	16.8 ft (5.1 m)
Speed	18.5 knots (34.3 km/h) surfaced 8 knots (15 km/h) submerged
Range	10,500 nautical miles (19,400 km) at 11 knots (20 km/h) surfaced 16 nautical miles (30 km) at 8 knots (15 km/h) submerged
Test depth	500 feet (150 m)
Complement	61 officers and men
Armament	6 × 21 inch (533 mm) bow torpedo tubes (2 external, one-shot, later removed) 4 × 21 in (533 mm) stern torpedo tubes (2 external, one-shot, later removed) 16 torpedoes or 26 mines carried internally 1 × QF 4 in (102 mm) gun (Mk XXII or Mk XXIII) 1 × one Oerlikon 20 mm cannon 3 × .303-caliber machine guns

The Amphion class (also known as the "A" class and Acheron class) of British diesel-electric submarines were designed for use in the Pacific War. Only two were completed before the end of hostilities, but following modernisation in the 1950s, they continued to serve in the Royal Navy into the 1970s.