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Hmmm ... respectfully disagree with that last comment ...ItsBruce:Your guest was well into what the tables tell us was deco territory if he was using air, but not everyone who goes into deco territory and fails to do "mandatory" stops gets DCS. I recently saw some amazing statistics on this. Of course, nitrox or trimix could have reduced the risk of DCS.
The "best mix" for nitrox at 165 is EAN24 ... which wouldn't give you any appreciable benefit over air as far as DCS risk is concerned.
And a trimix gas will increase the risk ... helium ongasses and offgasses faster than nitrogen, so an emergency ascent on trimix is more likely to bend you than the same ascent on air.
Considering the time frame of this alleged dive, it's unlikely that a sport diver would have been using anything other than air ...
... Bob (Grateful Diver)