13,000 year-old underground tunnels discovered in Brazil – “non-man-made, not naturally formed”
2022-09-02
(quote)
In the 1930s, a group of archaeologists and explorers looking for the remains of the Mayan civilization went deep into the rainforest, where they did not find the remains of the Mayan civilization, but unexpectedly discovered many tunnels. Most of these underground tunnels are distributed in Brazil and Argentina. At the same time, there seems to be no unified construction standard for these tunnels.