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I totally agree. I've dived down to 213 ft on air, and although I was narced, it wasn't debilitating. However, I was diving in clear subtropical water in a wetsuit and familiar kit. I suspect it would have been a different story in cold dark water and with a drysuit. Me thinks trimix is more...

This is my exact point - Mr pilot here obviously feels Trimix should be part of the gasses used by new divers etc.. Anyway, I'm going to pack up this discussion now - It serves no purpose, and I'm sure nobody in their right mind would be promoting Trimix to new divers - Even those with a Padi...

Stephen Philips, the TDI director of Product development? I suspect he probably would, since TDI don't offer a recreational trimix course. But you stick to the agencies who promote trimix for the masses - Both of us will be happier that way.

whatever.. yes, on nice tropical reef dives you can do multi level. here, we've got deep wrecks in cold water so we go down to max depth and stay there until we start the ascent. ok, getting fed up of this. The fact that you can't seem to have a discussion without attacking my training...

Ok, cool - Never really had issues with narcosis until hitting 45 m, but I know some people get it worse than others, so that's fair enough. Totally agree with the rest of your comments though.

Sorry, think you've got it wrong here. Although Tech is usually a reference to overhead environment, recreational diving is defined as no-stop diving to a depth of no more than 40 meters with most mainstream agencies (Apart from BSAC which operates with 50 meters and deco - which in my book is...

That would be the advanced trimix course.

Yes, but I suspect the severity of an oxygen bend would be less than a bend from an inert gas, since the body will metabolize the oxygen, and hence reduce the bubble size until it's gone. Could have some nasty short term effects though.

Fair enough - I guess that's one school of thought. There has been argued that peoples ability to operate better in clear calm water is to do not so much with the physiological narcosis, but more to do with the psychological effect of diving in a hostile environment (if you can call it...

Maybe so, I'm not an expert on the physiology. In the TDI training I did, the mantra was 'A fast ascent on air and you'll hurt. On Trimix, you will almost certainly die' - Now of course this applied primarily to missed deco and fast ascent, but the point was that Helium is less tolerant to rapid...

I don't agree with using Trimix for Recreational diving. Narcosis is not a significant problem at depths of 40 meters or less, and if you dive deeper than 40 meters, then it's per definition a tech dive (or a stupid dive, should you try to do it with a single cylinder and no deco). You increase...

Sorry mate, you will need another course and another card - You need the Padi advanced hyperoxic triox card. Don't you know you will need a card for every voodoo gas you want to dive with;) E;)

Oxygen would increase the gradient which would make you offgass faster. It's referred to as the Oxygen Window Oxygen window in technical diving - Wikipedia, the free encyclopedia You learn more details about these aspects of gasslaws in the advanced nitrox and the trimix courses.

Yes, that is correct, but why would anyone want to dive 30/30? Just to burn some extra money on gas? I guess if you REALLY hated narcosis, then you could potentially get some benefit out of it.. It's true that the NDL of 30/30 is more than air, but if you compare it to EAN30, it's pretty...

That was in response to your post that Trimix had all the benefits, but none of the disadvantages. The point is that whilst diving nitrox gives you a longer NDL at a give depth, trimix does quite the opposite, but it eliminates narcosis. So in other words Trimix is a solution to a different...

I'd like to see the schedule for the poor sod trying to deco on a 18/40 mix.. Would be spending some time on the 3 meter stop... EDIT: And here's the schedule for that dive done with 18/40, 55 and 100, and lost gas scenarios to illustrate;) -- lost gas --> OK 55 100...

I've got one of them bad boys, and I can assure you, it is not a problem. E:)

It's actually equivalent air depth, but the principal is correct.

Suspect the AOW includes drysuit and nitrox adventure dives. This still does not qualify you to dive with nitrox or drysuit - It's simply an experience under direct supervision by an instructor... So I would suggest not to retake your AOW and instead do nitrox and drysuit as specialities instead.

I suspect the need to flush a hard hat, as TSands correctly pointed out, is due to the much greater dead air space in a helmet than in a recreational scuba regulator. When you have a greater dead air space, there is a risk that when you're breathing, you're breathing mainly co2 from your...