frogman:
(also ‘scuba diver‘: plural: ‘frogmen’; pronunciation: ‘frog…man’; for the right pronunciation, please click here)

a frogman in half-suit
a skilled underwater swimmer who wears a special suit of water-proof clothes/suit, a special apparatus on the head and back (oxygen cylinder) for breathing and a pair of large flat plastic or rubber shoes (flippers), especially who works under water for under water military operations, police work, etc.,

military frogmen, weapon training
Mr James Thrompton, our swimming club patron, was a frogman in the Navy who served in several recent wars for our nation and for the UNO peace keeping forces around the world.
Though traditionally ‘frogman’ is used to refer to military personnel whose job is to work under water, ‘frogman’ is also used to refer to ordinary ‘scuba divers’, especially by the news reporters, and technically, the military personnel who work under water are called ‘combat/combatant divers’ or ‘combatant swimmer’, and non-military people who use ‘dry suit’ to swim in water are called ‘scuba divers’.
The police force also uses frogmen whose job usually consists of dredging or trawling ponds, lakes or swamps for missing persons (dead bodies) and objects, such as weapons, vehicles, etc., suspected to be dumped or hidden in any large body of water.

a police frogman searching a pond for a missing person
