I understand this point Andy but the issue of opening the 02 window also affects the gas switch at 21m on to 50% 02 50% Nitrogen? Obviously the 1.6PP02 is the preferred max level at this depth but the 21m stop doesn’t last long and you’re immediately into low PP02s again? Why is opening the 02 windows on 50% and finishing the dive on it on a PP02 of 0.81 any better than doing deco on 32% & 80% and finishing the dive on a PP02 of 1.29?
Surely for the O2 window argument to stand up GI3 should advocate the 100% for deco theory on all dives?
Surely holding ANY deco mix at 1.6 for 5mins would open the 02 windows?
As Matt said when is enough enough?
Always puzzled me this one.
ATB
Mark Chase