William Trubridge just released an interesting wisdom about narcosis he experiences during his training in the Dean's Blue Hole in Bahamas, in dives below 100m. There is also another comment about narcosis from Guillaume Nery: William Trubridge News
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Yes, as I wrote above, it is very well known and tought to all deep scuba divers, that CO2 retention amplifies nitrogen narcosis, so it indeed is very much related (and freedivers experience much higher CO2 levels than most deep scuba divers). And of course, hyperventilation, physical effort, stress, and cold, influence the strength of the effect. However, physiologically taken, it is still considered nitrogen and not carbon dioxide narcosis.Trux - I don't know either, but I do know that if I over-ventilate before a dive then the narcosis is lessened. Will has also mentioned this. This would indicate it is related to CO2?
Yes, as I wrote above, it is very well known and tought to all deep scuba divers, that CO2 retention amplifies nitrogen narcosis, so it indeed is very much related (and freedivers experience much higher CO2 levels than most deep scuba divers). And of course, hyperventilation, physical effort, stress, and cold, influence the strength of the effect. However, physiologically taken, it is still considered nitrogen and not carbon dioxide narcosis.