These tunnels were once believed to hide religious fortunes deep in their chambers, but the real treasure is found in who - or what - created them. Deep claw marks embedded into the walls indicated its past occupant was not human. A geologist and one of the scientists who visited the farmer's property, concluded was the work of a giant ground sloth from at least 10,000 years ago.
These giant tunnels in South America aren't caves – they’re prehistoric burrows
South America was home to armoured giants like Holmesina and Pampatherium, which were several times larger than any of their modern cousins. Frank and his colleagues suspect these animals could certainly be responsible for some of those palaeoburrows. 