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John, Thanks for the interesting and thoroughly informative posting on helium & heat loss. I was involved with an fascinating dinner conversation with Bill Stone and Jean-Pierre Imbert on this topic during the Tek '94 meetings. Bill wrote a good summary of the physics you just described in his Wakulla Springs Project, and maintained the same position that you do (that heat-loss from breathing helium is not an important consideration). However, Jean-Pierre maintained that his deep divers DID experience noticably greater heat-loss when breathing heloix. He also clarified that this happened when the divers were surrounded by air. Since I could see no physical explanation I ended-up siding with Bill, and assumed the COMEX divers' symptoms were psychosematic. Nevertheless, I encounter quite a bit of diving "reality" that does not jibe with presently accepted understandings of things...so who knows.... As for me personally, I've notice absolutly no differences in heat-loss between breathing trimix or breathing air (I don't use a dry-suit). Aloha, Rich
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