http://warisboring.com/articles/und...ally-into-them/

The Soviet Union began developing underwater guns nearly 50 years ago. The idea — to arm commando frogmen and other combat divers for underwater engagements, however rare and unlikely these subsurface firefights might actually be.

In the late 1960s, Moscow enlisted “TsNIITochMash” — the Central Scientific Research Institute of Precise Mechanical Engineering, a Soviet design bureau — to work on an underwater handgun.

The thing is, water is 800 times denser than air. Even though many guns will fire underwater, making an effective underwater firearm is another matter.

“Underwater, conventional bullets are highly ineffective, being inaccurate and limited to a very short range with a rapidly decreasing lethality,” Robert Segel explained in Small Arms Defense Journal. Traditional bullets basically lose all velocity and sink or fall apart almost immediately after hitting water.


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