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When Scientists Realized What Made These Tunnels The Mystery Had Only Just Begun

15. Caves

blogs.discovermagazine.com

In Brazil, near the border of Bolivia, scientists discovered massive caves. When they realized these enormous caves weren’t made by geological processes, they started to wonder what kind of creature made them. The holes are large enough for an average sized adult male to stand up in, so whatever it was, had to be gigantic…

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