I was not on the boat, I'm just aware of the incident. I'm a tech diver, and like most, I'm a bit anal about safety. One of the first things you learn in any tech diving class is that there are no rescues, only body recoveries. When something goes wrong a mile back in a cave, you either fix it yourself - quickly - or you die. So we do incident evaluations on anything involving diving, to figure out what went wrong, and see if there is any way to prevent it from happening to anyone else. Sadly, nobody has found a cure for bad choices.
I'm familiar. That's some cold water there. Dry suit cold.
I've found treasure, of a sort.
A buddy of mine owns a dive shop in Cancun. A fellow who was planning to build a water park on some land he owned hired Alvaro to explore the cenote there. It had never been dove. I went down, and the two of us started mapping it. Mapping a cave is meticulous and really sort of boring. But you do see cool things, and being someplace no human has ever been before is an interesting feeling.
The cenotes in that area are mostly limestone. Limestone is flakey. In a virgin cave, the flakes can be dislodged by your bubbles, and it looks like it's snowing. Which is cool. Except that it's really bad for visibility, and that is a Really Bad Thing (tm) for cave diving.
About 1/4 mile in, we found this:
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That is a tooth from a mammoth. There are some fragments there that might be other bits of the skull.
In another cenote in the same area, we found this:
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That is a fish whose ancestors have been in the total blackness of these caves for enough generations to loose all color. And their eyes.
That counts as treasure to me.