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[MENTION][FV]I believe that nitrox does not make a difference with nitrox. Not entirely sure as far as experience. I do know that if you build up to deeper dives, you may not "feel" the narcosis as much. However, dark narc can happen at any time. It's a fairly random occurrence. I also know that I've experienced regular narcosis many times from 100-130 feet with decreased ability to make decisions and tunneling of my ability to think. I've also had dark narc a couple of times, which is quite scary. I think both times, this was brought on by CO2 build up caused by current and exertion at depth.
Here's an old link to help promote some discussion:
http://www.scubaboard.com/forums/basic-scuba-discussions/468350-narcosis.html#post6926829
Here's an old link to help promote some discussion:
http://www.scubaboard.com/forums/basic-scuba-discussions/468350-narcosis.html#post6926829