Geophysics expert Rene Chavez said on Thursday that the underground river chamber is naturally covered by rock. Such underground rivers often connect the open cenotes, or sinkhole lakes, that dot Mexico’s Yucatán peninsula.
The discovery was made using a kind electrical resistance survey, not by excavating. Chavez said one corner of the pyramid rested on the underground chamber, so it was in danger of collapsing.
Story: AP | Story: David Pedre, Getty Images
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