how big was the cavern in which the three explorers discovered a vast underground sea?
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S.A. expedition explored the cave to −1,710 m (−5,610 ft) making it the deepest cave in the world. For the first time in the history of speleology, the deepest cave in the world had been established outside of western Europe. Since 2001, the Krubera explorations by the Ukr.
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