Scientists Found These Massive Tunnels – Then Realized They Were Dug By Giant Prehistoric Beasts

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Image: Heinrich Frank
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In a Brazilian state called Rondonia, deep in the Amazon, researchers found an enormous complex of strange caverns. In fact, it stretches more than 2,000 feet into the ground, with the roof standing 6 feet from the floor – and this discovery led to a heap of questions that scientists are only starting to get their heads around.

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