Whaaat I didn’t know they made those!
*googles
Looks like Russia made one during the Cold War for frogmen firefights (<-wild) At a depth of 15 ft, its effective range was 99 ft!! The deeper you go the worse it gets though, and it totally sucks on land too
*edit 99 ft, not 909 :(
Actually yeah. Didn’t even think about that
Def a possibility