back in the (good old) days the were refered to as FROGMEN in the armed forces.
from the merriam Webster online dictionaryMain Entryfrog·manPronunciation\ˈfrȯg-ˌman, ˈfräg-, -mən\FunctionnounDate1945
: a person equipped (as with face mask, flippers, and air supply) for extended periods of underwater swimming ; especially : a person so equipped for military reconnaissance and demolition
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