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Please pardon me for initiating a completely new thread, but I would like to
know
a bit about the communications systems that you people use.  I have seen systems
that cover the nose/mouth area like a surgeon's mask, systems that are
integrated
into full-face masks, and (admittedly cheap) systems that are integrated into a
reg second stage.  What do you use and/or prefer, and why?  As well, are those
commercial-type diving helmets readily available to the technical/recreational
diving community?  I know they are used by scientific divers in polar regions,
and also
by some cavers (something I saw on TV).  It makes a lot of sense to have that
sort of comfort and exposure protection, as well as facilitating easy
communications, and I 
would be most appreciative of any input on either of these two subjects.

-Sean T. Stevenson

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