About 176,000 years ago, Neanderthals built enormous rings from broken stone formations 336 meters inside a French cave — more than two tonnes of material arranged in total darkness for a purpose arch
Researchers have dated complex stone structures found deep within a French cave to 176,500 years ago, attributing them to Neanderthals. The discovery of these 'speleofacts' suggests that Neanderthals possessed more advanced social and cognitive capabilities than previously assumed.
Why it matters
This evidence challenges long-held assumptions about the cognitive abilities of early hominids and their capacity for complex, non-utilitarian construction.
The discovery forces archaeologists to reconsider what Neanderthals were capable of—and what drove them into the deepest darkness.
Published September 14, 2026 · How we edit
Two and a bit tonnes of snapped rock, stacked into neat circles, in a chamber that has never once seen daylight.
Bruniquel Cave sits above the Aveyron gorges in the Tarn-et-Garonne region of southwestern France. Cavers dug through a scree slope in 1990 and opened a passage running deep into the hillside. Three hundred and thirty-six metres in, well past the point where anyone could see a hand in front of their face, the floor stops looking like geology and starts looking like furniture.
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