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John the way I understand it the helium, or lighter gas, actually
contributes to isobaric inert gas counter diffusion. It should be noted the
reverse process of switching from a heavier inert gas to a lighter inert gas
(e.g. nitrogen to helium) can create a "super-saturated" condition, where
the tissue inert gas pressure is greater than the ambient inert gas
pressure, even with no change in depth from the switch! This is the basis of

lengthy and often misguided discussions on isobaric inert gas counter
diffusion.


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


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