Archeologists digging in the dirt and black ooze under Mexico City's most important public square have been tantalized for decades by the possibility of a great treasure and likely burial place of one of the last Aztec rulers.
"They keep finding astonishing things as they inch their way along," says David Carrasco, a Harvard University historian who's worked with Mexican archeologists at the Templo Mayor.
But the great find – a royal tomb – has eluded scientists. The city of Tenochtitlan, the Aztec capital that lies beneath the modern Mexico City, was founded on an island in the middle of a saltwater lake.
A high water table makes progress difficult. "When you dig a pit or a trench, you find very quickly the water level and cannot continue if you don't have a powerful pumping system," says Leonardo Lopez, the archeologist heading the excavation.
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