Jon,
Several sled (freedivers) have already blacked out from O2 toxicity, including Pipin and Audrey. Usually they black out on the ascent, still attached to the lift bag, then regain consciousness shortly after, still on their way up, when O2 levels drop.
Not to mention that at the bottom, often they can't see anything (vision tunnels then vanishes completely). Either narcosis or O2 toxicity, or CO2 narcosis, the debate hasn't been resolved.
Eric
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