PADI Deep?

[gobfish1]

Originally Posted by Andy Phillips

Deep air, it has been decided, is too dangerous for us to use.

Andrew

Well blow me, thats all i need, Someone selling me trimix for a 35m dive ,
I think not. No one will decide what gas i use, BUT ME ,,,,

Steve G

thanks for that m8 keep me in the good books ,

[scubadoguk]

To a point it is to show narcosis, But it also is to show proper planing, table usage, procedure and a role model deep dive(no don't laugh) I agree in part that the narcotic effect is a little lost but by how much ? as we can't predict how much one guy is affected from day to day and doing the timed task above water it always seemed like people wait for the task and lost the part of the effect for the narcosis because of focus, a lot see that as the purpose of the dive just to do the task missing much more.

[Janos]

Originally Posted by Mr T.

I think you might be missing the point here mate.

[detail]the diver had completed the Nitrox course earlier that week before doing his AOW course[/detail]

[Snip]

What, then, is the use of removing, significantly, the element of exposure to narcosis by allowing the student to use a 32% Nitrox mix for the deep dive module of the course?

No. I believe that Nitrox 32% is just as narcotic as air. I would expect to feel just as narked irrespective of which gas I was breathing.

Laters,
Janos

[Mr T.]

Originally Posted by Janos

No. I believe that Nitrox 32% is just as narcotic as air. I would expect to feel just as narked irrespective of which gas I was breathing.

Laters,
Janos

Janos mate, if you're saying that you see/feel little if any difference between using 21% and a 32 mix, then dude, you and I have different receptors!! Eeek!

Getting back to the question - no has has yet addressed why PADI/a PADI centre might opt to remove one of the more important and worthwhile aspects (the 'real' affects of being narked and how to recognise and redress them) of their Deep course - when that element/mudule of the course is designed to show you - in full glory - those very affects?

[dry suit diver]

can't give you the answer you require ,but i did the underwater tasks quicker than on the surface but i did feel slightly pissed at 29m on my AOW so i know what starting to get narked feels like.

and my gauge and computer showed exactly same reading

[tom]

Originally Posted by Mr T.

Janos mate, if you're saying that you see/feel little if any difference between using 21% and a 32 mix, then dude, you and I have different receptors!! Eeek!

Getting back to the question - no has has yet addressed why PADI/a PADI centre might opt to remove one of the more important and worthwhile aspects (the 'real' affects of being narked and how to recognise and redress them) of their Deep course - when that element/mudule of the course is designed to show you - in full glory - those very affects?

Theoretically - there should be no difference in narcosis level breathing 21% and 32% - IF oxygen is considered narcotic (which theoretically it should be). So breathing nitrox should not take away the narcosis effects you are alluding to; so theoretically it should make no difference whether the deep dive is done on air or nitrox.

HOWEVER - I personally find I experience less narcosis when diving nitrox (or maybe I believe / perceive that I feel less?). I find that hard to reconcile with what I know of the science, but there you go. We had a thread about this a few months back where I was basically asking about it.

So both of you are right I guess!



(BTW on my 'Deep' dive - which was about 26m - I did the tasks considerably faster than on the surface. Breathing air.)

[Janos]

Originally Posted by Mr T.

Janos mate, if you're saying that you see/feel little if any difference between using 21% and a 32 mix, then dude, you and I have different receptors!! Eeek!

But of course we have different receptors. I don't have any tentacles.

I think I feel equally narked on Air and Nitrox. However my susceptibility varies from day to day so it's hard to judge. Maybe one of these days I should dive a 'bantin rig' (different gasses in the twinset) and swap between them and see if it makes a difference.

Laters,
Janos