When did the underwater caves below the Yucatán Peninsula fill with water?



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    The caves of the Yucatan were formed through a combination of geologic factors, including dissolution, glaciation, and the impact of a large asteroid.  The caves were originally filled with water for millions of years where it was filled with corals until active glaciation caused the sea level to drop, whereby the caves were no longer completely full of water.  Erosion of the limestone lead to the passages of the caves that are now present.

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