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> Respiratory heat loss can indeed become a major factor, especially
> at depths greater than 600ft.  However, if we could compare
> the heat loss from a nitrogen-oxygen mix as compared to a helium-oxygen
> mix, the helium mix would probably be about the same as the nitrogen-
> oxygen due to other considerations besides just heat capacity.

I seem to recall Jean-Pierre was comparing helium-oxygen mixtures to
trimix, and that he firmly believed that the helium in the breathing
mixture was responsible for the heat loss.  There may have been some
miscommunication due to the language barrier, but his english is very good
(helluva lot better than my french, anyway...).  I found it difficult to
believe him, because from a physics perspective, there are no more joules
of heat energy lost from breathing helium than from breathing nitrogen -
that's why I suspected that his divers were imagining things. 
Nevertheless, he's certainly no dummy, and he certainly has a lot of
first-hand experience with mixed-gas deep diving.

For now, though, I still very-much agree with you.

Aloha,

Rich

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