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Scientists map 8 more previously unknown miles of Mammoth Cave NP cave system

The world's longest cave, protected as Mammoth Cave National Park in Kentucky, is longer than you might have thought. Recent efforts by the Cave Research Foundation have mapped eight more miles for the cave, bringing its currently accepted length to 420 miles.

It's probably a safe bet that the cave's length will grow as more pushes are made underground to see how long it really is.

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