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A question (actually two) related to long thread on enriched air and depth.
 
a)  If a diver in an emergency at depth switched to a too-high-PPO2 mix,
would the effects of oxygen toxicity kick in immediately or is there a
brief period of 'grace' - and if the latter, what factors influence this?
 
b)  Does oxygen narcosis relieve immediately on ascent to an appropriate
depth in the same way that nitrogen narcosis does?
 
Cheers,
Huw