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Mark Chase · 10th January 2007, 21:14

Quote: (Originally Posted by Mixaddict)

Hi Ron,

Thanks for your thoughts. Have been doing some dives in locations where helium in unavailable (or at least very difficult to get!) For me personally, it has seemed while diving CCR that I have been feeling the narcosis at more shallow depths than I typically do on OC, and basically wondered if other divers felt the same way. But here again, as you well know, it comes and goes differently on different days! My suscpicion is that the perceived narcosis level increase on CCR for me is possibly more about task loading than actual narcosis increase?

Anyway, just mostly curious. Usually, if I am going deeper than 140 feet on CCR, I squirt some helium in the dill. On OC, I am usually comfortable with going quite a bit deeper (subject to conditions.)

Interesting thoughts on the O2 not contributing to the narcosis. As you are aware there are a couple of schools of thought on this topic. I am going to give your experiment a try next time I'm out.

Regards,
Randy

I dived OC single tank to 35m out in Cuba in March 06 I was down there thinking "what is this strange feeling i feel all odd?" then it dawned on me i was feeling Narcosis. Having not dived OC 30m+ for about a year prior to this I had forgotten what it was like. I dive 18/45 for everything down to 50 and 14/65 past that so I am no longer used to feeling narked.

ATB

Mark Chase

10th January 2007, 21:14	#33 (permalink)
Mark Chase RBW Member Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,820	Re: Deep air on OC vs. CCR Quote: (Originally Posted by Mixaddict) Hi Ron, Thanks for your thoughts. Have been doing some dives in locations where helium in unavailable (or at least very difficult to get!) For me personally, it has seemed while diving CCR that I have been feeling the narcosis at more shallow depths than I typically do on OC, and basically wondered if other divers felt the same way. But here again, as you well know, it comes and goes differently on different days! My suscpicion is that the perceived narcosis level increase on CCR for me is possibly more about task loading than actual narcosis increase? Anyway, just mostly curious. Usually, if I am going deeper than 140 feet on CCR, I squirt some helium in the dill. On OC, I am usually comfortable with going quite a bit deeper (subject to conditions.) Interesting thoughts on the O2 not contributing to the narcosis. As you are aware there are a couple of schools of thought on this topic. I am going to give your experiment a try next time I'm out. Regards, Randy I dived OC single tank to 35m out in Cuba in March 06 I was down there thinking "what is this strange feeling i feel all odd?" then it dawned on me i was feeling Narcosis. Having not dived OC 30m+ for about a year prior to this I had forgotten what it was like. I dive 18/45 for everything down to 50 and 14/65 past that so I am no longer used to feeling narked. ATB Mark Chase __________________ See my "Doing It Chasey" video where I'm locked into a padded room, naked, with two ball bearings and within an Hour, I manage to lose one and break the other!!! Kevin Juergensen 16/11/08 [/quote]
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