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Although it is possible to ascend too slowly and thus violate NDLs, in reality, if you start and ascent within NDLs and make a continuous ascent, you would have to be pretty darn slow to cause a problem. That is why multi-level dives are possible. When I was researching for my goal of writing...

Correct me if I'm wrong, but you sound like you are taking about saturation as if the tissues were like a bucket of water that is full to the brim. A tissue that is saturated has simply reached equilibrium at that depth. It is not maxed out. If it went deeper, it would not longer be at...

Did you ask if they would accept only Deep Diver in lieu of AOW?

Ron's language made the process of diffusion more clear. The average reader looking at this will not understand what is meant by the pressure differential. It is not like a wind blowing. Let's say you have been on the surface for days, and you have achieved equilibrium. Your lungs have a...

Yeah--isn't it a shame that professional dive instructors are looking to be paid when they provide instruction? They have no shame. They should offer all their services for free, the way it is done by everyone else.

As was briefly mentioned earlier, In the mid 1960's, the only certifications offered were diver and instructor. Los Angeles County saw that a very high percentage of divers were quitting diving soon after certification. They created a class that would provide more skills and offer a sampler of...

Another factor to consider is that the PADI Deep Diver course requires the student to have at least the Adventure Diver certification. That is a rare certification that is almost AOW. It is rare because there is almost no reason not to go the last step to get the AOW. The certification primarily...

With what agency? PADI requires 4. Can you quote a policy statement from an operator? I find this hard to believe.

My information comes from The History of NAUI, written by NAUI founder Al Tillman and others. This was in the mid 1960s.

Then there was the time I had my double LP 108s filled in South Florida, and the guy who filled them said one of the burst discs had been leaking slightly, but he had fixed it. I thought he meant he had tightened it. I did not know he had instead replaced the disk, putting in one intended for LP...

AOW was created originally by Los Angeles County, followed by NAUI, for the purpose of getting divers interested in a variety of kinds of diving in the hope it would pique their interests and keep them diving. At the time it was created, it was the most advanced class available other than...

There is no reason to think about it until you decide you are going to start the kind of diving the requires that much gas. When (or if) that time comes, there will be lots of options to consider, and the weight of doubles will be among the least important things to consider.

Are there any computers that do this? I am not aware of any. If you have to do decompression stops, you are on a decompression dive, not a NDL dive.

Assuming these are not unusually small tanks, there is no technical reason for their early exits. My best guess would be that they were doing some kind of training exercise. In reality, you can get more dive time in with two dives on doubles than with equally sized singles, because you only...

I am a retired tech instructor who definitely does all the setting up for my tech dives, but they are becoming fewer and farther in between as I age. I do a lot of NDL diving in Florida, and I set up my gear there, as does everyone else. When I travel to other parts of the world on NDL trips...

It can take more than twice, but they are getting better and better at it over time. Good luck!

I have had DIN valves go out of round and become unusable simply by lying in the bed of a truck and having another tank shoved forcefully into place against it. You learn to be careful. In every case of a valve going out of round, I have been able to fix it. You need a steel DIN plug. You screw...

No. The GF low setting only comes into play if you go into decompression.

So you are warning people that if they use GFs, they need to watch their computers to make sure they don't go into decompression. Are you saying that if they use another system, they don't need to watch their computers to make sure they don't go into decompression? What's the difference between...

I am honestly having trouble understanding what you are saying. If I misunderstood because of my inability to read the king's English, I apologize. It appears to me that when you talk about the GFs, you are focusing on the GF low and its impact on NDL dives, but the GF low has no impact on NDL...