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Might I remind everyone that Helium mixes have many more advantage's
than just the reduction in inert gas narcosis.  Although the reduction
in narcosis is a very BIG advantage many of the other physiological
advantages are often overlooked aspecially on this mailing list.

  Helium based mixes offer a greater reduction in breathing resistance
which would more than likely reduce the likelyhood on CO2 retention thus
reducing the likelyhood of DCS through acidosis, Hb bonding, ect. ect.
ect..

  Helium based mixes also offer some very nice offgasing properties due
to lack of lipid solubility (and the retention there of) and the
permating characteristics of this fine mono atomic gas.

  Helium based mixes are also being used for their reduction in isobaric
counter diffusion, for good reasons.

  Helium based mixes also offer the possibility to reduce the FO2 of
your bottom mix there for reducing the likelyhood of peroxidization to
many different tissues towards the end of your dive.

  And so-on and so-on.

  
  Choi,  
  John
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