Hoyo Negro, Mexico

This underwater cave contains human skeletal material believed to be among the oldest human remains discovered in the Americas. The project, co-led by Dominique Rissolo of San Diego State University and his colleagues from Mexico's National Institute of Anthropology and History, will protect the site through the construction of a secured entrance gate, fencing, and signage, as well as to improve access for researchers by building a road, stairway, and dive platform.

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