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Congratulations to the explorers. This has been a long-sought connection that many teams have worked hard on making. It finally happened!

This is a civil trial, not a criminal one. So there is no guilt or innocence. This is just an apportionment of liability, without the moral judgment of a criminal "guilty" verdict.

Pet Cemetery is gorgeous, but becoming prohibitively expensive. Some are even scootering in from Nohoch to dive the Blue Abyss just to avoid that ripoff. That's of course not an option for cavern divers. So I'd go with Dreamgate instead, which has a somewhat similar flavor (very white and...

Oh, the cavern line is a circle, just a little over 500ft. long. On a typical cave dive where I know the place, I swim about 500 ft. in ten minutes. So the cavern line is 15 minutes max, unless I do several rounds, or just swim very slowly. And, the pretty speleothems are not on the cavern line...

The suggestions above are pretty good: Dos Ojos and The Pit are classics and not to miss, they can be busy, though. Closer to PDC, Tajma Ha is also very nice, especially when the Points of Light are visible - something more likely in the summer, but April might do. To make it a day of diving...

For me it all depends on context. If I walk into my LDS and ask for an 80% deco mix, I'd expect to get EAN80. It would be odd if they asked how much He I'd like in it. But if someone in Tulum told me that he went to the deep lines in the Pit the other day, and that the 'mix for the dive was...

Any suggestions about taking an Al 40 deco tank to Mexico? I can certainly drain it and remove the valve, but what's your experience with getting it filled again with O2 there, without a new cleaning?

I will be in Puerto Aventuras Dec. 14-18, and I'm looking for cave diving buddies. I'm full cave, and know my way around, that is, I can find the start of the lines in many of the more popular cenotes. Please PM if you are up for a dive or two during that time.

I see them quite a bit in the Great Lakes. But I personally go to sidemount on all dives on which I would bring one. More comfortable for me, and I'm used to it.

I actually think this is beginning to make more sense now. Speculating, based on what's above, that the victims shot their SMB and were on their shallow deco stop whenever the electrofishing boat approached to check out the SMB. Now you have the electrodes right on top of two shallow divers, and...

Thank you very much! That gives me a much better idea of what's going on, and what we know that we still don't know. I really appreciate it.

The recent discussion of hyperbaric oxygen and oxygen toxicity made me realize that I don't really understand how CNS oxygen toxicity works, and a quick search didn't yield any useful results. Perhaps someone can fill me in? First, how does the oxygen get to the brain? The hemoglobin is already...

Because for oxygen therapy to have an effect, you will have to go to oxygen doses that your physiology reacts to. Like any medication, if you take enough of it to be effective, there is a chance of side effects. With the partial pressures and times involved in hyperbaric oxygen therapy, there is...

Back idea. If there is an incident in the chamber and you have a seizure from too much O2, you will survive. Underwater, you'll drown. Also, for reasons that are still unknown, the body appears to tolerate higher O2 exposures in the chamber than underwater.

Are you getting a refund for the liveaboard portion from Blackbeard? If so, are you only stuck with the cost of the flight, or so there more?

Well, this just means you didn't bring it up, either, before you splashed. I think it is an appropriate role for the more experienced buddy to lead the pre-dive discussion, making sure nothing gets missed. But you still want to treat the less-experienced diver as a responsible peer. You never...

I think you missed my point: I was saying that dive planning is a collaborative exercise of the team, no matter whether someone has as few as 20 or 100 or as many as several thousand of dives to their name. It has to be a discussion, and in the end, the plan everyone is comfortable with, usually...

As your instabudy, this would likely rub me the wrong way. Instead of being told what my turn pressure is, I'd expect a conversation along the lines of "Me: To be back on the boat with 500, and both of us to be able to ascend safely, I'd like to be back on the anchor line with XXX, or with more...

LOL- the exact same thing happened to me. It's a powerful gateway drug. The first hit is (almost) free. You can get the excitement as an OW diver in your regular gear for the price of a boat dive. And then you want more, take the courses, buy the technical gear, travel back to get more...

I cannot imagine that there are vast numbers of cavern tour fatalities that are being covered up. Not in this day of social media, and a very gossippy local cave diving community. There are always dozens of divers at the more popular cenotes, including guides and instructors. On a busy day it's...