Personally I doubt I would do a deep air dive. AFAIK I havent been narced (others may disagree
) but then my deepest dive is less then 40m. I know some others that dont think they have been narced to similar depths, howevere I think we all agree it happens at some point, sometimes different points on different days, so who knows when/where it will strike. Consequently it seems to make sense to me to use Trimix for a deep dive rather than air.
Matt