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Thanks to people here, I feel I've now got a reasonable basic, academic,
understanding of mixed-gas decompression.  While causually reading the CDG
manual the other day, I came across Reverse Gas Diffusion - the claim was
that when diving specifically on Heliox, it was unacceptable to decompress
on Nitrox mixes because incoming Nitrogen would inhibit the release of
Helium already in the body - you should decompress on Heliox until shallow
enough to use O2.

I've not come across this elsewhere, and the CDG manual is not a model for
bug-free documents, particularly when dealing with areas outside the normal
experience of UK cave divers, so this could well be just wrong.  However,
since practically all non-professional mixed gas divers seem to be using
Trimix, and no mention is made of the problem with Trimix, perhaps it is an
issue?  Any comments?

Thanks in advance,
Neal


Dr. Neal Harman
Department of Computer Science
University College of Swansea
Singleton Park
Swansea
SA2 8PP

TEL: +44 792 295394
FAX: +44 792 295708

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