|Builder:||Armstrong Whitworth, Newcastle upon Tyne|
|Laid down:||9 November 1916|
|Fate:||Sold, 14 December 1921|
|Class and type:||E class submarine|
|Displacement:||662 long tons (673 t) surfaced
807 long tons (820 t) submerged
|Length:||181 ft (55 m)|
|Beam:||15 ft (4.6 m)|
|Propulsion:||2 × 1,600 hp (1,193 kW) diesel
2 × 840 hp (626 kW) electric
|Speed:||15 knots (28 km/h; 17 mph) surfaced
10 knots (19 km/h; 12 mph) submerged
|Range:||3,000 nmi (5,600 km) at 10 kn (19 km/h; 12 mph) surfaced
65 nmi (120 km) at 5 kn (9.3 km/h; 5.8 mph) surfaced
|Armament:||• 5 × 18 in (457 mm) torpedo tubes (2 bow, 2 beam, 1 stern)
• 1 × 12-pounder gun
HMS E40 was a British E class submarine launched by Palmer, Jarrow in 1916 and was completed by Armstrong Whitworth, Newcastle upon Tyne. She was laid down on 9 November 1916 and was commissioned in May 1917.
|This section does not cite any references or sources. (May 2014)|
During her World War I service while patrolling Scandinavian waters E40 encountered a U-boat. As the submarine dived the captain was hit with shrapnel and had to be dragged in; the hatch stuck and the vessel took on water, going straight to the bottom. After an hour the air was poor; with the captain unconscious, the first lieutenant asked the crew if he could use the remaining oxygen to try to raise the submarine. This succeeded and the E40 managed to get back to Middlesbrough where it had been posted missing, presumed sunk. The captain survived.
HMS E40 was sold on 14 December 1921.
- Hutchinson, Robert (2001). Jane's Submarines: War Beneath the Waves from 1776 to the Present Day. London: HarperCollins. ISBN 978-0-00-710558-8. OCLC 53783010.
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