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>     Bill Deans has a system for communicating with his safety divers while
they 
> are in the water. They can talk to him or each other. We were thinking about 
> doing this whie filming for telvision, so the non-cave-diving film crews
would 
> know what to do. Call Deans at Key West Diver. - George

I've use two methods to verbally communicate with people underwater - both
with fairly good success. One involves talking into a collapsable bag of
some sort (a glove is handy); the other is by forming an air space by
cupping your hands around your mouth on top of another diver's head and
talking straight into them.  They hear it through bone conduction through
the skull.  Works better than you might think. 

Aloha,
Rich

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