Hank49
Contributor
MikeFerrara:Me too but we haven't heard back from the original poster yet. Maybe some one already jumped on it.
I swear Mike, I wonder about you. I've gotten so much flack from you about diving deep on air in clear, open reef...but then you would actually go down a mine shaft, 100 years old, with possible shifted soil substrate, rotted lumber that may be ready to collapse at any moment, who knows what else.....I don't care what gas mixture you're diving. That's major danger. I'll stick to 1.6 ppO2 on single tank air, thank you very much.