I had heard, wrt heliox vs trimix, that a number of professional groups (services and or prodivers) had reported an extra increase in DCI when shifting N2 levels on dives. The upshot being that 0%N2 was set as the baseline and no changes made during the dive. I can't vouch the validity of this though. On a related note, do sport divers on trimix ever use gas heating units? Jason.
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