HMS Achates (P433)

History
United Kingdom
Name	HMS Achates (P433)
Laid down	8 March 1944
Launched	20 September 1945
Fate	Expended as a target June 1950
General characteristics if completed
Class and type	Amphion-class submarine
Displacement	1,360/1,590 tons (surface/submerged)
Length	293 ft 6 in (89.46 m)
Beam	22 ft 4 in (6.81 m)
Draught	18 ft 1 in (5.51 m)
Propulsion	2 × 2,150 hp (1,600 kW) Admiralty ML 8-cylinder diesel engine, 2 × 625 hp (466 kW) electric motors for submergence driving two shafts
Speed	18.5 kn (34.3 km/h) surface, 8 kn (15 km/h) submerged 10,500 nmi (19,400 km) at 11 kn (20 km/h) surfaced 16 nmi (30 km) at 8 kn (15 km/h) or 90 nmi (170 km) at 3 kn (5.6 km/h) submerged
Test depth	350 ft (110 m)
Complement	60
Armament	6 × 21 inch (533 mm) (2 external) bow torpedo tubes, 4 × 21 in (2 external) stern torpedo tubes, containing a total of 20 torpedoes Mines: 26 1 × 4 in (102 mm) main deck gun, 3 × 0.303 machine gun, 1 × 20 mm AA Oerlikon 20 mm gun

HMS Achates was a planned Amphion-class submarine of the Royal Navy, launched in 1945 but not completed and expended as a target off Gibraltar in June 1950.^[1]