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HMS A7.jpg
Career Royal Navy Ensign
Name: HMS A7
Builder: Vickers Barrow-in-Furness
Laid down: 19 February 1903
Launched: 23 January 1905
Commissioned: 16 January 1905
Fate: Sunk in Whitsand Bay, 16 January 1914
General characteristics
Class and type: A-class submarine
Displacement: 190 long tons (190 t) (surfaced)
207 long tons (210 t) (submerged)
Length: 105 ft 3 in (32.08 m)
Beam: 12 ft 9 in (3.89 m)
Draught: 10 ft 6 in (3.20 m)
Installed power: 550 hp (410 kW) (petrol engine)
150 hp (110 kW) (electric motor)
Propulsion: 1 × petrol engine
1 × electric motor
1 × screw
Speed: 11 kn (13 mph; 20 km/h) (surfaced)
8 kn (9.2 mph; 15 km/h) (submerged)
Range: 325 nmi (374 mi; 602 km) at 11 kn (13 mph; 20 km/h) (surfaced)
20 nmi (23 mi; 37 km) at 6 kn (6.9 mph; 11 km/h) (submerged)
Complement: 11 (2 officers and 9 ratings)
Armament: 2 × 18 in (460 mm) torpedo tubes (2 torpedoes)

HMS A7 was an early Royal Navy submarine.

She was a member of Group Two of the first British A-class of submarines (a second, much different A-class submarine appeared towards the end of the Second World War). Like all members of her class, she was built at Vickers Barrow-in-Furness.

She sank in Whitsand Bay, Cornwall on 16 January 1914 with the loss of her crew whilst carrying out dummy torpedo attacks on Onyx (her tender) and Pygmy. An oil slick was seen and the location marked. Several attempts were made to salvage her over the next month by attaching hawsers to the eye-ring on the bow, but her stern was too deeply embedded in the mud and the hawsers parted without pulling her out. She lies today where she sank, in about 130 ft (40 m) of water. In 2001, she was declared as one of 16 wrecks in British waters designated as "Controlled Sites" under the Protection of Military Remains Act by the British Government and which cannot be dived without special permission.


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Coordinates: 50°19′45″N 04°18′25″W / 50.32917°N 4.30694°W / 50.32917; -4.30694