http://www.sciencemag.org/news/2020/07/were-humans-living-mexican-cave-during-last-ice-age

Researchers dug nearly 3 meters deep in Chiquihuite Cave and found almost 2000 stone tools.

At first glance, Chiquihuite Cave in Mexico’s Zacatecas state is an unlikely place to find signs of early humans, let alone evidence that might change the story of the peopling of the Americas. It sits a daunting 1000 meters above a valley, overlooking a desert landscape in the mountains north of Zacatecas. Getting there requires a 4- or 5-hour uphill scramble over a moonscape of jagged boulders.