100% O2 would be dangerous below 10 metres, but your post made me think that it would be interesting to do all the breathups, negative dives, and be fully kicked in, then take a full breath of say 40% Nitrox. You could still dive to something above 17 metres or so and be reasonably free of O2 convulsion risk. Of course this is not breathing from a reg underwater, just the final breath at the surface.
Cheers,
Erik Y.
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