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I have just set up an argon drysuit inflation system in anticipation of doing
some trimix dives.

I am currently diving with a Viking Pro Surveyor drysuit, and use the dryhood
that comes with the suit.  For those unfamiliar with this, the dryhood is a
latex hood which fits over a sort of skullcap.  It seals around the face, and
is inflated by exhaling through one's nose, into the mask, and thereby into the
dryhood.  One's head is thus surrounded by the same gas that one breathes, which
may or may not be the same as the suit inflation gas.

My question to the net is, does anyone have experience using this type of
dryhood in long, cold water dives with helium-based breathing mixes?  Does it
cause one's head to freeze from the thermal conductivity of the helium, or does
the extra thermal protection afforded by argon suit inflation usually offset
this?  My trimix instructor's repsonse when I asked him the question was "Hmm,
let's try it and find out!", so I may answer my own question this week.  I know
I could always go back to a wethood, but I like the extra warmth and comfort of
the dryhood.

JHeimann@sc*.gt*.co*

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