Great documentary

The evidence is very compelling, that homo naledi, who lived 250-300,000 years ago and had a much smaller brain than modern humans, engaged in what we would consider human-level practices, burying their dead, using fire, making tools, and writing.

Not everyone is convinced (see article below), but there really isn't a better explanation for how all those skeletons ended up in such an inaccessible place, while still almost completely intact, unless another member or members of their band took them there on purpose. And they couldn't have done that in the dark.

https://www.scientificamerican.com/article/this-small-brained-human-species-may-have-buried-its-dead-controlled-fire-and-made-art/