Well, speaking as a SCUBA diver (OC and CCR) your comments about O2 really baffle me.
I regularly use up to 80% Helium, and 100% Oxygen. On my rebreather the Oxygen mix varies between 100% and 21%. If I start doing deeper than 50m oxygen content will drop below 21%.
If you are going to put forward comments about any subject, please check your information before posting.
TTFN
Pete S
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