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Coral Reefs of South Water Caye, Belize

from Live Science

Amazing Images: The Best Science Photos of the Week

A bather wades in clear blue waters in a cenote, or sinkhole, on the Yucatan Peninsula of Mexico. Cenotes form when the limestone ceiling of a cave collapses, revealing the void (and the groundwater) below. Some of these sinkholes look like large exposed lakes, while others, like this one, become underground cathedrals, with only a small hole in the ground allowing rays of light through. The water in cenotes is crystal-clear because it percolates up through the ground, ......