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My best guess is that the jury took this as two big egos insulting each other in public, and that the trial was a waste of everyone’s time.

For open water, no-deco dives there are better gas planning rules than thirds that were specifically devised for that. Rock bottom would be one of them. But if you always turn your dive under these conditions at two-thirds, and are back to the up line at one third, you should have under most...

I’m still puzzled by the entire sequence of events. Where did the gas go? Even with the suspect gas planning and a SAC rate at the high end of normal, they should have had plenty of gas to get out at either exit if they indeed turned on thirds. I have to believe that at least one of the divers...

A federal court in Los Angeles has ruled that the defamation suit by cave explorer Unsworth against Elon Musk can go forward. Unsworth was a participant in the cave diving rescue of the Thai soccer team last year who criticized Musk's submarine-building operation as a PR stunt, which in turn led...

I wonder if, instead of ascent time one were to set an acceptable chance of a DCS hit, let’s say 0.1% per dive, as the constant. What would then the shortest deco profile that satisfies that requirement be? Or, the profile that consumes the least amount of gas? Could the former result in a...

That sounds like a very reasonable choice for such a comparison. I presume one could have also chosen “for the same amount of deco gas” as the limiting factor, but that would make matters only worse for the deep-stop dives.

Wow - double staging for your full cave graduation dive? That would be unusual for most agencies, unless you did something like C2, which is a bit more than full cave.

The arrow at J1 points to Grand Cenote.

Well, deco is not quite that black and white, in fact every dive is a deco dive in a way. In fact, I treat a required safety stop, per PADI tables, as mandatory deco. Case in point: a 20 minute dive to 100' on air is the NDL per PADI tables, with a required safety stop of three, or better, five...

Here's a different map of the site, with the additional areas. I penciled in the dive in question as well as I could.

Thank you for preparing this report. In some way it is unsettling, and saddening. No major navigational errors, equipment failures, or such. Just dubious gas planning (were they stage certified, or just full cave?) and then apparently a major lack of awareness of gas pressure, perhaps due to...

No reputable guide would take a diver who is not cave certified on a cave dive. There are some well-prescribed exceptions - a cave instructor can teach one level up, that is, take a cavern certified diver on an introductory cave dive, like what he or she would do on the first day of an intro...

20/80 is over a range of depths/times a good approximation for ratio deco. I have used it when diving with GUE buddies to be on a similar schedule. But otherwise, no.

For me personally, it varies. In cold water (Great Lakes) I noticed that I do not remember a whole lot of a dive deeper than 115ft when on air. Even though I felt perfectly coherent durong the dive, and quite confident that I would have handled contingencies ok. But why pay for the boat etc. if...

No. Just no. I’m not exactly a fan of GUE, but they will teach you way more in fundies than this. Including why diving to 40m without helium in the mix is not necessarily a good idea.

I didn’t realize that this is the same guy until you pointed it out. Kudos to your good memory, Marie. And as to the OP, I think we’re well into trolling territory. He couldn't get away with advocating cave diving without proper training, and now he’s trying the same with deco diving.

Shallow water blackout, or trapped under the deck? I’m sure he pushed his breath holding abilities to the limit, and had no margin for error. And most certainly no buddy or safety diver.

With respect to the duty to render aid, laws vary widely. In Germany, for instance, everyone is required to render aid in an emergency within their ability and without neglecting other important duties or endangering yourself. Generally that means when you come across a traffic accident, the...

I have one wing with a shoulder dump valve, and two with a bottom dump valve. Their location may vary depending on the design. Whenever I dump air from any of them, I have to adjust my body to make sure it’s at the top, and there is actually air to dump. I use the dump button on the inflator...

A simple solution might have been, once you were at the safety stop and knowing that you were pushing the limits based on the backup computer, to simply signal “five minutes”. I.e., signal “level off” for the safety stop, followed by a “five”. I’m sure the divemaster would have understood, and...