HMS Alliance (P417)

	HMS Alliance on display at Royal Navy Submarine Museum
History
United Kingdom
Ordered	1943 Emergency war programme
Builder	Vickers Armstrong, Barrow-in-Furness
Laid down	13 March 1945
Launched	28 July 1945
Commissioned	14 May 1947
Decommissioned	1973, static training boat until August 1979
Identification	Pennant number: P417 (S67 from 1961)
Status	Museum ship/memorial since 1981 at Royal Navy Submarine Museum
General characteristics
Displacement	1,360/1,590 tons (surface/submerged); 1,385/1,620 tons after streamlining;
Length	281 ft 4.75 in (85.7695 m)
Beam	22 ft 3 in (6.78 m)
Draught	17 ft (5.2 m)
Propulsion	Two 2,150 hp (at 450 rpm) supercharged Vickers 8-cylinder diesel engine, Two 625 hp electric motors for use underwater, driving two shafts
Speed	18.5/8 knots (surface/submerged); 18.5/10 knots after streamlining;
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; 90 nautical miles (170 km) at 3 knots (6 km/h) submerged;
Endurance	36 hours submerged at 2.5 knots
Test depth	500 ft (150 m)
Complement	5 officers, 56 ratings (63 ratings after modernisation in 1960)
Armament	Six 21 in (530 mm) bow torpedo tubes (including 2 external dry close fit); Four 21-inch stern torpedo tubes (including 2 external dry close fit); 20 torpedoes carried (externals could not be reloaded at sea); Mark V mines could be launched from the internal tubes; External tubes removed during streamlining/modernisation.; One QF 4-inch Mark XXII deck gun on S2 mounting; One 20 mm AA Oerlikon 20 mm gun on a Mark VII mounting, (briefly fitted with a twin Oerlikon on a Mark 12A mounting).; All guns removed during streamlining/modernisation.;

HMS Alliance (P417/S67) is a Royal Navy A-class, Amphion-class or Acheron-class submarine, laid down towards the end of the Second World War and completed in 1947. The submarine is the only surviving example of the class, having been a memorial and museum ship since 1981.

The Amphion-class submarines were designed for use in the Far East, where the size of the Pacific Ocean made long-range, high surface speed and relative comfort for the crew important features to allow for much larger patrol areas and longer periods at sea than British submarines operating in the Atlantic or Mediterranean had to contend with. Alliance was one of the seven A-class boats completed with a snort mast - the other boats all had masts fitted by 1949.

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