HMS E40

History
United Kingdom
Name	E40
Builder	Armstrong Whitworth, Newcastle upon Tyne
Launched	9 November 1916
Commissioned	May 1917
Fate	Sold, 14 December 1921
General characteristics
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 × 800 hp (597 kW) diesel; 2 × 420 hp (313 kW) electric; 2 screws;
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;
Complement	31
Armament	5 × 18 inch (450 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 launched on 9 November 1916 and was commissioned in May 1917.

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.

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