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Yep, you can get an advanced cert to use mixed gases (i.e. heliox, nitrox). I agree that narcosis is not something you want to fool with, taking your regulator out of your mouth and swimming off is not unheard of. I would place intentional narcosis diving in the same domain as diving while seriously drunk in terms of your likelyhood to screw up and drown or bolt for the surface.
BTW, seeing as you live in St. Croix, have you dived on "the wall?" I did that one around 94-95, spectacular!
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Grant
In the stable: 1938 Buick Special model 41, 1963 Solex 2200, 1973 Vespa Primavera 125, 1974 Vespa Rally 200, 1986 VW Vanagon Syncro Westfalia, 1989 VW Doka Tristar, 1995 Toyota Land Cruiser, 2011 Pursuit 315 OS, 2022 Tesla Y
Gone but not forgotten: 1973 VW Beetle, 1989 Porsche 944, 2008 R56 Mini Cooper S
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