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Thanks. Is his single anecdote read on the internet okay to regurgitate, but a different single anecdote read on the internet is not? Eh, screw being argumentative. I'm of the opinion that there are useful things to be learned on the internet, just have to take what you read with a grain of...

Sorry about your night dives. That sucks. Oddly, we never had any problem in January. Awesome octo shot. Kudos to S.

Hmm. How does that play into the 'what they need to know' equation? Is the assumption that a supervisor will always be available and will never suffer an emergency him or herself? Is the ability to complete a dive from whatever point and potentially rescue someone requisite, and if so, what is...

All of that is kinda 'whatever' in my book. The only major hangup is the auto-deflate 'feature' of the bungee. If you tear a wing, hydrostatic pressure will force air up and out, but you can position yourself such that it has no path to do so. This is sometimes demonstrated in tech courses by...

Nope, nor am I offering advice; just asking questions about something that smells funny. Incidentally, how do dual bladder wings work? Does a 90# wing consist of two 45# bladders, or are the primary and redundant bladder each capable of 90#?

Do you believe that you can add 50% capacity to anything (diving equipment or otherwise) with no other effects?

George joined Facebook recently. I think if he friends you, you're in. :P

But "right" is a black and white term. If something isn't right, it's wrong. Right? (2+2=3 is not 75% right; it's wrong). AFAIK, the term DIR originated with the conclusion of one of George's articles, "If it's not hogarthan, it's not right..." Per my interpretation, it's fair to conclude that...

You know the old saying "Don't shoot the messenger [because you don't like the message]"? Well, in my experience, most derisive commentary regarding DIR take the perplexingly opposite form - they shoot the message because they don't like the messenger (a guy who hasn't been vocal about diving...

Snuba.

Do the PADI standards define mastery? If not, is it therefore open to instructor discretion?

Perhaps this explains why many/most PADI students demonstrate diving skills while planted to the bottom... :D

Hell, the simplest answer is that Rule 1 predates GUE.

What now? I have both IANTD and TDI advanced nitrox cards. I'm not sure I can get 100% with the former, and I don't recall anything about decoing at 1.5 max... Sure, I'd be curious. It's wrong, BTW.

Yah it's probably close to the first order.

Perfect gas law really doesn't apply at high pressure. I know we use it for generalities across the entire fill pressure, but I'd be interested to see how close it is up at the full end of the spectrum. Unfortunately my SPG isn't accurate enough to do a meaningful experiment :P

Absolutely. Hell, I've talked to a number of new divers who believe they must continuously exhale during ascent rather that breathe normally. Is it any wonder people get headaches?

... come again?

There is no easy way to quantify it I'm aware of. But it doesn't really matter. If you've computed that you must begin ascent at 500PSI, do so. Consider that temperature induced pressure decrease a part of your gas consumption.

Maybe, maybe not. http://m.guardian.co.uk/science/2010/dec/22/placebo-effect-patients-sham-drug?cat=science&type=article