A few weeks ago I was with German, the owner of Yucatech expeditions in Cozumel and he told me about the caves in Cuba, apparently they have a very similar Geological structure a the Cenotes that we have here, but with a lot of quartz in them, reflecting the light in an amazing way, I'll try to go next year.
Contact German, he was exploring and training guides there, I'm sure that he will give you all the insights,
http://www.yucatech.net/contactus.htm
A lot of americans fly through Cancun, is very cheap and there are like 3 flights a day to la Habana.
If you get to dive there don't forget to post some pics.
Hope this helps, cheers,
Ernesto.
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