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Sean -- Cave divers never use full-face masks *except* for TV shows where a personality/host wants to give his/her impressions on camera for the edification of the audience. The reason for not using them on real cave dives is practicality -- sharing air by swapping an FFM back and forth ain't gonna be fun. I just spoke with Steve Linton ( International Association of Dive Rescue Specialists) who mentioned that a dive manufacturer and electronic voice-com maker are teaming up to release a new combined system for the garrulous diver. Or divers (plural), since talking to one's self is something we can already do on the internet. Film crews, law enforcement, researchers have used com systems to great effect -- saving time, coordinating teams and movement, etc. Commercial divers use com continuously throughout their dives to confirm diver status, get/give instructions, and verify/complain about their pay rate. I would like to give voice to another com system also, that doesn't use voice or require an FFM. There is an excellent device called the DiveTracker that uses sonar and LCD read-outs, allowing users to either punch in or use pre-programmed messages, sending and receiving between multiple points, such as several divers underwater and a surface command person. It also is a navigation tool, and deco computer and, one time, helped the inventor, Marco Flagg, to keep from being bitten in half by a Great White. That we will some day be able to check with our stockbrokers via voice uplink from underwater, I have no doubt. Me, I'll probably order a pizza. For good info on using full face masks and applying com with them, ask me about the AGA and EXO FFM videos I distribute. PS -- That's a "Supreme" with extra cheese, hold the anchovies. Christopher A. Brown The Technical Diving Video Library by Sci-Graphica PR/DOCENT FILMS Tallahassee FL 32311 chbrown@fr*.fs*.ed* P 904-942-7222, F 904-942-1240 It's not the pace of life that concerns me -- it's the sudden stop at the end.
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