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I think I have seen every procedure imaginable. The one you don't want to accept is the one where they tell you what is in the tank and expect you to accept it without checking it. I have had that happen more than a few times, and I simply tell them I want to check it myself. They always produce...

I'm pretty sure it means an MOD of 29 meters.

I still usually use it. They used to call it Geezer Gas. I'm a geezer. I generally try to avoid such dives to the greatest extent possible, but sometimes you have no choice. Unless it's super shallow, I'm doing the nitrox.

I never thought it made any sense. I think it's prevalence is at least partially true to Dive Training magazine, which had at least two articles by editor Alex Brylske that essentially said that divers had two (and only two) choices for using a computer with nitrox: 1) dive with limits set for...

Here is the story of a recent dive I did that may be instructive. I was planning to do a 2-tank dive to a wreck with a maximum depth of 130 feet, and I had my tanks filled with EANx 29 just in case I decided to go to the maximum. I ended up, however, buddying with a skilled diver with 32%. He...

Lets of people say it is one or the other. It isn't. You can have longer bottom times and greater safety. People who think that way always assume divers will dive to the maximum allowed time on nitrox, but you don't have to do that. On the PADI RDP, the maximum bottom time for a dive to 80 feet...

I see. So all you have to do to avoid getting shorter bottom times is shorten your bottom time.

I will join with emphasis those who said two hours is not enough time for the pool session. I could never get a student through all the skills in that amount of time. When I was certified, I, too, had a two hour pool session, and it was not for a long time that I realized how many required...

I was on a dive in Cozumel. Early in the dive, the divemaster blew an O-ring in his first stage regulator. There was an immediate eruption of bubbles, and I headed over to help. By the time I got to him, he had gotten the BCD off, shut off the air, and was taking the regulator off of the valve...

Absolutely! It took me a couple years as an instructor to realize that many students had a fear of having their regulators out of their mouths, and it made them near frantic to do the skills that required it. I devised an demonstration that I did at the very beginning of class. In the shallow...

Now that your intended question has been thoroughly answered... Your concern with that question and this statement I quoted here leads me to suggest that you and your buddy learn to relax more on your dives. It isn't that hard, and it isn't that dangerous. When I was teaching for a dive shop...

Well, let's talk about that. The way you use the term "safety" is the way many people think of the term--as an all or nothing concept. In reality, nothing in life is perfectly safe. I am sitting at my computer typing in relative safety, but there could be a gas leak that is about to blow me to...

Powell was a strong believer in bubble theory and VPM. When I was still teaching for TDI, the (then) new AN/DP course materials followed his lead and were all in on it. He eventually (much later than most) converted to the more current belief that bubble models tended to create first stops in...

You seem to be confusing opinions on best practice with the reality of what was happening in this incident. I never said what she was doing is best practice. My only point here is that we don't know the pressure in that person's tank. It is obviously your opinion that people should only share...

If you are on full oxygen, you can do the stop at any depth between 10-20 feet.

So reality doesn't matter?

Even with a Shearwater it is something of a pain. You make that brief drift down a foot or so and you get a high PPO2 warning, and you then have to press the button confirming that you are aware of it on both your computers. That is a reason I don't understand the people who leave 20 foot as...

And how do you know this to be the case? As was pointed out in the thread, some people plan to share air before they get very low so that they never get very low. In a case discussed earlier in the thread, people spoke of a policy of sharing air when the diver reached 1,000 PSI so that the...

Here is what the first post said: It just said that the diver regularly shared air "towards the end of the dive." The poster's title indicating she was OOA was conjecture. He has no way of knowing the amount of air in her tank. She could have been just making sure she got back on the boat with...

As a number of posts indicated earlier in the thread, the rest of the post and discussion suggests that the title of the thread is inaccurate. It happens.