> work up to them. And when I'm rich and a few thousand quid means less > than it does now, the cost benefit will swing the other way, and I'll be > breathing heliox (and *no* there will be no nitrogen in sight), to do > stuff I'm doing now. I'm not yet convinced that heliox is the way to go on dives deeper than about 250 feet or so. On the few occassions I have breathed heliox at such depths, I have been jittery, nervous, and have found it difficult to concentrate. I don't seem to have this problem with trimix. The sample size is too small for me to be speculating much more right now. Aloha, Rich
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