Wet sub

A wet sub is a type of underwater vehicle, either a submarine or a submersible, that does not provide a dry environment for its occupants.

[2] This type of submarine differs from other underwater personal transport devices by the fact that it has a hull around it and it is not a "bare bones" design.

[5] The Motorised Submersible Canoe, developed by the British Special Operations Executive during World War II, is another example.

[6] An example is the pedal-operated wet-sub called "the Scubster", which is powered by a twin propeller connected to the pedal belt.

[7] Every two years, a human-powered submarine race takes place at the Naval Surface Warfare Center in Bethesda, Maryland.

A " Sleeping Beauty " wet sub used by the Royal Navy during World War II
CGI image of a WWII-era British " Chariot manned torpedo " ridden by two frogmen with UBA rebreathers . The warhead is detached from the vehicle for placement upon or under a ship, allowing the operators to use the machine for escape.
SEAL Delivery Vehicle Team Two launch a wet sub from Los Angeles -class submarine USS Philadelphia
A civilian Havas submarine [ Fr ] wet sub
Scubster by Stéphane Rousson [ fr ]