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"We think it had a ritual purpose. Offerings were placed at the very end of the tunnel as part of the pyramid's construction process," Mexican archaeologist Alejandro Sarabia said. "We want to find out why the Teotihuacan people sealed it and when," he said. Mr Sarabia said the tunnel was first discovered in the early 1970s but it was closed soon afterward, and most of the information about it was lost when the archaeologist who found it died.