|Laid down:||19 February 1903|
|Launched:||23 January 1905|
|Commissioned:||16 January 1905|
|Fate:||Sunk in Whitsand Bay, 16 January 1914|
|Class & 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)|
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.
- Innes McCartney (2002). Lost Patrols: Submarine Wrecks of the English Channel.
- Colledge, J. J.; Warlow, Ben (2006) . 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. OCLC 67375475.
- "A Class (1902) Submarines Class Overview". Maritime Quest. Retrieved 2007-08-06.
- SI 2008/950 Designation under the Protection of Military Remains Act 1986
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