Genesis

Why is normoxic Trimix any different than air as a diluent?

Both have the same mod.

Yeah, yeah, you're narced out of your gourd at 150 on air. Ok. Been there, done that, got the T-shirt and still breathing.

I don't get the purpose of this so-called "Restriction".

Let me see if I can put this more succinctly - "You want me to dive on a LESS safe gas mixture?"

I don't think so - there is no argument for not using normoxic gas for any dive below 80-100' on a CCR, since there's no material cost issue any longer as there is on OC.

I can see a "level" system dealing with the oxygen content in the mix (e.g. a different cert level for normoxic and hypoxic dil) but give no quarter who try to tell me to dive a less safe gas mix unless I spend more money (or time.)

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