"The objects, believed to have been made by the Matlatzinca people between the 13th and 15th centuries and placed in the lake by pre-Hispanic priests, are stored in a specially-made container that allows water and sediment to flow over them. As a result, they are protected from deterioration."
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Underwater archaeologists have returned 52 pre-Hispanic ritual objects to the place where they were found: the bed of a crater lake in the volcano.
