N.M. cavers chart unique 'snowy' river of crystals

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Caver John McLean talks about the many questions scientists have about the Snowy River formation while on an expedition in Fort Stanton Cave N.M. on July 3 2008. New Mexicos two U.S. senators have proposed legislation to designate the cave and Snowy ...
Caver John McLean talks about the many questions scientists have about the Snowy River formation while on an expedition in Fort Stanton Cave, N.M., on July 3, 2008. New Mexico's two U.S. senators have proposed legislation to designate the cave and Snowy River as a national conservation area. (AP Photo/Susan Montoya Bryan)

(AP) -- Hundreds of feet beneath Earth's surface, a few seasoned cave explorers venture where no human has set foot. Their headlamps illuminate mud-covered walls, gypsum crystals and mineral deposits. The real attraction, though, is under their shoes.


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