|Builder:||Vickers Armstrong, Barrow-in-Furness|
|Laid down:||24 February 1910|
|Launched:||24 October 1911|
|Commissioned:||19 April 1912|
|Fate:||Sunk 28 June 1918|
|Class & type:||D class submarine|
|Displacement:||Surfaced= 483 tons / Submerged= 595 tons|
|Length:||163.0 ft (49.7 m) (oa)|
|Beam:||13.6 ft (4.1 m) (oa)|
|Propulsion:||550hp electric 1750hp diesel twin screws|
|Speed:||Surfaced=14.0 kts / Dived= 10.0 (design) 9.0 (service)|
|Range:||Surface= 2500nm at 10 kts / Submerged=45nm at 5knots|
|Armament:||3x18 in (46 cm) torpedo tubes (2 forward, one aft, 6 torpedoes) / 1x12 pdr (76 mm) QF gun|
HMS D6 was a British D class submarine built by Vickers, Barrow. D6 was laid down on 24 February 1910, launched 24 October 1911 and was commissioned on 19 April 1912. D6 was the first of the D class to be armed with guns forward of the conning tower.
D6 was sunk by UB-73 73 miles north of Inishtrahull Island off the west coast of Ireland on 24 or 28 June 1918. There were two survivors who were taken prisoner. Their post-war report apparently prompted the British to conclude that the torpedo that sank her had employed a magnetic pistol.
- Fitzsimons, Bernard. Illustrated Encyclopedia of 20th Century Weapons and Warfare (London: Phoebus, 1978), Volume 7, p.674, "D.1".
- Fitzsimons, p.674.
- Admiralty. Annual Report of the Torpedo School, 1919, p. 22.
- The Royal Navy Submarine Service, A Centennial History, by Antony Preston
- 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.