Hundreds of tunnels—which date back at least 10,000 years—have been discovered in Brazil. Some of the tunnels feature mysterious claw marks’ on the walls.
“There’s no geological process in the world that produces long tunnels with a circular or elliptical cross-section, which branch and rise and fall, with claw marks on the walls,” says a geologist. “I’ve [also] seen dozens of caves that have inorganic origins, and in these cases, it’s very clear that digging animals had no role in their creation.”
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