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Only lucky if they headed your warning. The worst consequence you would have suffered would have been that two very alive idiots would despise you.

Call DAN: +1-919-684-2948. 8:30 - 5 EST. Would not dive again until you do.

Your buddy is not just your spare air. In my meager 50 dives, I have been in 3 entanglement situations (once when I had a line caught on my tank valve, and twice when others were caught in line) where what could have easily turned into a serious problem was no big deal precisely because I was...

Let's forget about the temperature of the metal for a minute, assuming that all of the rigid parts are perfect insulators. Then, the temperature of the gas is our only concern. Allow the expansion, and then allow the gasses in the two vessels to reach thermal equalibrium. I know this cannot...

Try not to think if it as "Helping Wife Learn Scuba", and more think of it as going for a dive while your wife is learning. I would stay away from the pool sessions altogether. During the open water sessions, save setting up your gear for when the instructor is instructing your wife. That way...

No. The 3000 psi is a static load. It is not pounding back and forth on the walls of the tank. Air molecules move just as much when there is 15 psi air in the tank as they do when there is 3000 psi. The air molecules bumping into the walls of the tank do not cause fatigue. Variations in...

I am not a tech diver, but I love to dive with tech divers. Tech divers still do buddy checks even after thousands of dives. Tech divers maintain close buddy contact. Tech divers aren't afraid to tell you if something is out of place with your gear. When a particular dive op has a tech diver...

It is true that no work is being done on the system as a whole. However, work is being done by the gas in the bank to push the air through the hose. The expansion is why the air in the bank cools. If no work was being done during the expansion, there would be no cooling. Conversely, work...

You can also try overweighting a pound or two on the weight belt if simply using the belt doesn't help. The additional air in your BCD will tip your front end up to balance your legs. Keep in mind that if your legs are light, you will need to use the muscles in your hips and butt to keep them...

Where in Thailand? Mermaids in Pattaya is very good.

Where did you get this info? My understanding is that the incidence of CNS oxygen toxicity while diving is so low that there wouldn't be any way to actually do a statistical comparison.

ppN2 is 1.0 at 8.77 ft. You are correct that you would have an infinite dive time with a ppN2 of 1.0, but no specifically because it is 1.0 atm. In the case of nitrogen, you are ongassing as long as the level in your tissues is less than the level you are breathing, so at 8.77 feet, you...

Actually, this is not correct. Fatigue, by definition, is caused by cyclic loading. Metal does not fatigue under constant load (pressure in the case of a tank). Scuba tanks are designed for over 100,000 cycles, and will therefore never fail from fatigue over the life of the tank. When tanks fail...

My answer to the original question is "As little as is needed" If I was OOA, and had to do and emergency buoyant ascent (from too deep to CESA), I would drop my weight pockets one at a time until I started to ascend. If my BC lost buoyancy, I would only ditch weights as a last resort. In...

I would love to have that particular problem. There are so many ways to move weight down on your body, and so few ways to move it up. I vote for the weight belt, which I avoid because I have the exact opposite problem.

Fully agree. Most divers I have seen are already pretty crappy at buddy contact. I think this would just make it worse. Being able to text "I'm Out of Air" doesn't do you a lot of good if your buddy is out of site.

Read the article more closely. JT predicts the change in temperature for a free expansion where no work is done. For an ideal gas, this temperature change is zero as the temperature is constant for an ideal gas when the enthalpy remains unchanged. For a real gas, there is a very small change...

All good answers. Just one thing to add. You never dive for long enough to get pulmonary toxicity which is the primary concern with 100% O2 in a hospital setting.

You seem to be fixed on one component of the whole equation, which by the way, is an extremely small component. You do realize that if you compress helium, it will get hotter, not colder.

Not sure how any of this contradicts anything I have said. To clarify, my first statement was not to imply that all processess are reversible, only that these statements are true during a reversible process. No refrigeration process in the world actually uses the JT effect. If you look at...