Michael Guerrero
Contributor
As for my tanks Brendon, I have two deco gases in mind, 50 and 80%, 100% I see it as a none flixeble gas and the difference between 80 is small.
Dude...the U.S. Navy allows 2.0 ppO2 as normal. Please understand that the standards applied by the (largely wealthy U.S. and European) dive industry is inherently risk averse and likely to overstate the risk. Breathe 80% at 20ft or 30ft, breath 100% at 20ft or 30ft. You're not going to see much difference. The sack of sludge (meat, water, goo) that humans are is not some delicate flower where any slight modification in %O2 is going to be the tipping point where you either live or die.