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Scuba diver exploring the underwater cenotes near Puerto Aventuras, Mexico
© Extreme Photographer/Getty Images

Underwater underground

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    Underwater underground

    © Extreme Photographer/Getty Images
    Like a giant block of Swiss cheese, Mexico's Yucatán Peninsula is riddled with holes called cenotes. Cenotes form when subterranean limestone dissolves, allowing underground water to penetrate. The rock above may cave in, forming a sinkhole that reveals the cool, often crystal-clear water. Other cenotes may remain below the surface, hidden and often unexplored. Cenotes vary in size from very small to several dozen yards across, and recent discoveries have shown that some cenotes lead to a series of underground cave systems that can span several miles in length.
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    Quick fact:

    The Maya believed that some cenotes like this were gateways to the underworld or afterlife.
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