400,000-year-old fossils from Spain provide earliest genetic evidence of Neandertals https://www.mpg.de/10364707/hominins-sima-de-los-huesos?c=19337591
Analysis of nuclear DNA from Sima de los Huesos hominins provides evidence of their relationship to Neandertals
excavation site in Sima de los Huesos Cave the scientists must crawl through narrow tunnels