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Explore on MSNThe Mystical Underground River In Mexico Where You Can Swim Beneath A Cave Full Of CrystalsMexico holds many enchanting destinations south of the border, including this underground river where you can swim in a cave ...
Krubera Cave in the republic of Georgia is currently the deepest known cave, at 7,208 feet. But Dark Star, with so many areas still to survey, is a prime candidate to take over the title.
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