fsardone
Solo Diver
sorry I missed the “air” bit ...Nope, they stopped recognizing deep air dives as I wrote.
The record you are referring to is a mixed gas dive, ie special breathing gas mix with lower oxygen content, lower nitrogen and additional helium vs air. 300ish meters on air is physiologically impossible, both due to oxygen toxicity and nitrogen narcosis, let alone WOB and its CO2 repercussions.