HMS E7

History
Name	HMS E7
Builder	HM Dockyard, Chatham
Cost	£105,700
Laid down	30 March 1912
Commissioned	16 March 1914
Fate	Scuttled, 4 September 1915
General characteristics
Class and type	E class submarine
Displacement	665 long tons (676 t) surfaced 796 long tons (809 t) submerged
Length	178 ft (54 m)
Beam	15 ft 5 in (4.70 m)
Propulsion	2 × 1,750 hp (1,305 kW) diesel 2 × 600 hp (447 kW) electric 2 screws
Speed	15 knots (28 km/h; 17 mph) surfaced 9.5 knots (17.6 km/h; 10.9 mph) submerged
Range	3,000 nmi (5,600 km) at 10 kn (19 km/h; 12 mph) 65 nmi (120 km) at 5 kn (9.3 km/h; 5.8 mph)
Complement	30
Armament	4 × 18 in (457 mm) torpedo tubes (1 bow, 2 beam, 1 stern)

HMS E7 was a British E class submarine built at Chatham Dockyard. She was laid down on 30 March 1912 and was commissioned on 16 March 1914. She cost £105,700.

Service history

E7 had a short career in World War I. She took part in the Second Heligoland Bight Patrol along with E5, D2 and D3. She and the other submarines returned from the patrol on 18 August 1914. Then on 30 June 1915, E7 began a 24-day patrol in the Sea of Marmara. She succeeded in sinking 13 ships and damaging many more.

E7 was scuttled on 4 September 1915 after being trapped by enemy nets off Nagara, Dardanelles.

References

• Submarines, War Beneath The Sea, From 1776 To The Present Day, by Robert Hutchinson.
• The Royal Navy Submarine Service, A Centennial History, by Antony Preston.