|Builder:||Vickers Armstrong, Barrow-in-Furness|
|Laid down:||14 February 1910|
|Launched:||23 September 1911|
|Commissioned:||23 March 1912|
|Fate:||Sold 19 December 1921 to H. Pounds|
|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|
D8 fought in the Battle of Heligoland Bight on 28 August 1914 along with sister ships HMS D2 and HMS D3. Then on 18 October 1914, D8 shadowed German hospital ship Ophelia which was judged to be spying and was interned.
D8 was sold on 19 December 1921 to H. Pounds.
- Submarines, War Beneath The Waves, From 1776 To The Present Day, by Robert Hutchinson
- 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.
- Fitzsimons, Bernard. Illustrated Encyclopedia of 20th Century Weapons and Warfare (London: Phoebus, 1978), Volume 7, p.674, "D.1".
- Fitzsimons, p.674.
- "HM Submarine D8". Roll-of-Honour.com. March 21, 2009. http://www.roll-of-honour.com/Ships/HMSubmarineD8.html. Retrieved September 3, 2009.
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