The 'natural reactor' in Oklo has been discovered by some french researcher from the CEA in the 70s. There is an entire scientific publication on the topic if

The 'natural reactor' in Oklo has been discovered by some french researcher from the CEA in the 70s. There is an entire scientific publication on the topic if it interests you: https://www.sciencedirect.com/science/article/abs/pii/S0016703796002451?via%3Dihub https://www.sciencedirect.com/science/article/abs/pii/S00167...