Welman submarine

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Welman with detachable warhead being trialled at Queen Mary Reservoir, Staines
Class overview
Name	Welman submarine
Builders	Morris Motors Limited
Operators	United Kingdom Special Operations Executive
Completed	100+
General characteristics Welman submarine
Type	midget submarine
Displacement	2,000 pounds (910 kg) without warhead (warhead: 500 pounds (230 kg))
Length	17 ft 3 in (5.26 m) without charge 20 ft 6 in (6.25 m) with charge
Propulsion	One electric motor, 2.5 hp, powered by a 40v 220amp/hr battery.
Speed	3 knots (5.6 km/h)
Range	36 nautical miles (67 km) at 3 knots (5.6 km/h)
Test depth	300 ft (91 m) (reduced to 100 ft (30 m) after trials)
Crew	1
Armament	1 x detachable charge of 425 pounds (193 kg) of Torpex

The Welman submarine was a Second World War one-man British midget submarine developed by the Special Operations Executive. It only saw action once and was not particularly successful.^[1]