See inside Slovenia's famed underground caves, where researches float down hidden rivers and past otherworldly formations. https://on.natgeo.com/2HdkPGU | National Geographic Science
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See inside Slovenia's famed underground caves, where researches float down hidden rivers and past otherworldly formations. https://on.natgeo.com/2HdkPGU | National Geographic Science
457K viewsApr 18, 2018
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