Thanks for the video of the Monster House--it brought back some good memories. Those are some amazing formations.
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The cenotes which are used for the tours vary a great deal. Ponderosa (Cenote Eden) has a cavern dive where you are basically diving alongside another Cenote, with a lot of great views out into the sunlight and open water. Dos Ojos, on the other hand, has a cavern line I'm not even sure is legitimately a cavern, and I felt very much as though I was cave diving when I did that one.
Personally, I think it is probably a lot safer to violate your 60 foot limit than to dive under an overhead, so if you hold to the former limit, you might want to hold to the latter one as well.
I thought the light was amazing. Where the sunlight penetrates the water as beams and where the daylight is more diffuse but forms a back drop to divers, the geology or whatever it is great.To dark and enclosed for me with no visual payback. Once I've seen one stalactite, you've seen them all. I really didn't get the attraction...a bunch of pretty much colorless mineral formations.