I don't know what i was expecting when i read this thread but i'd steer away from 'O2 is good to 10m or 30ft'. Most SCUBA agencies recommend much shallower depths. Infact at a partial pressure of 1.4bar PPO2 it could be toxic to certain susceptible individuals
especially when engaged in physical activity. Which you are not on a deco stop. I
think i remember reading even on freediving deco stops (no physical activity) now Herbert is using a full face mask incase of an O2 hit (prudent!)
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Its not the best idea but aslong as you took a breath of pure o2 at the surface ud be ok.
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I'm sorry but I don't think that is right, can someone else just confirm that. As far as i'm concerned PPO2 increases if you take a breath of O2 and go freediving on it, you would have less volume at depth but PPO2 increases still.
