Saturday, March 25, 2006

Exploring Mexico's Freshwater Sinkholes

Divers make their way through a freshwater sinkhole, known as a cenote, in Mexico's Yucatan peninsula in this undated photo. The cenotes, deep sinkholes in limestone that have pools at the bottom, are yielding scientific discoveries including possible life-saving cancer treatments. To match feature Environment-Mexico. REUTERS/Henry Watkins & Yibran Aragon

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