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