frogman

noun, plural frog·men [frog-men, -muh n] /ˈfrɒgˌmɛn, -mən/.

1. a swimmer specially equipped with air tanks, wet suit, diving mask, etc., for underwater demolition, salvage, military operations, scientific exploration, etc.

noun plural -men

1. a swimmer equipped with a rubber suit, flippers, and breathing equipment for working underwater