Tigerman
Contributor
And that would make for a very shallow average depth.. which was boulderjohns point, and mine..
Also just to do 90 minutes at 20ft on half an al80 (which would be 39 cuft, the al80 only is 77 full), let alone any part of the dive deeper, your sac need to be running at .27 cuft/min which Id think would be unusually low (or exaggerated).
Also just to do 90 minutes at 20ft on half an al80 (which would be 39 cuft, the al80 only is 77 full), let alone any part of the dive deeper, your sac need to be running at .27 cuft/min which Id think would be unusually low (or exaggerated).