I'm not sure about them all being joined
At least not via caves big enough to swim through, but as I understand it they're all around the rim of the Chicxulub crater.
(evil_andyStick stick stick stick sticky sticky stick stick, Wed 7 Jul 2010, 22:48,
Reply)
Could be similar to the florida water system
(rootsxrocks, Thu 8 Jul 2010, 6:13,
Reply)
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