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Name: HMS E40
Builder: Armstrong Whitworth, Newcastle upon Tyne
Laid down: 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 × 1,600 hp (1,193 kW) diesel
2 × 840 hp (626 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: 30
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.

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.

The shell that embedded itself in the conning tower of HMS E40 causing the submarine to dive to 330 feet.