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Experts: Underwater Archaeology Site Imperiled in Mexico

Pollution is threatening the recently mapped Sac Actun cave system in the Yucatan Peninsula, a vast underground network that experts in Mexico say could be the most important underwater archaeological site in the world. Subaquatic archaeologist Guillermo de Anda said the cave system's historical span is likely unrivaled. Some of the oldest human remains on the continent have been found there, dating back more than 12,000 years, and now-extinct animal remains push the horizon...

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