op must surely be a troll...I hope. But heres some calculations so you all know.
>at sea level you're at 1 atmosphere (ata) breathing 21% oxygen ..so .21>For every 10m/33ft you gain another ataso at 20ft: 20/33 = .61 + 1 = 1.61
1.61 ata * .21= .34...so 34% o2
1.4 is the limit for o2 in scuba, 1.6 you're in deep shit. To calculate MOD(maximum operating depth) we use this calc:
[(1.4ata/(your gas mix) - 1] * 33
for air:
[(6.67) -1] *33
5.67*33
187.11 is your MOD for air, past this as
>>2445230 you need to use whats called hypoxic trimix.
