Exploration in Kentucky Expands the World’s Longest Cave

Exploration in Kentucky Expands the World’s Longest Cave
Derek Bristol rappels off a steep ledge while exploring inside Mammoth Cave. Kassis Beirnacka
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Cave explorers discovered eight miles of tunnels at Mammoth Cave, bringing the total length of explored passageways in the world’s longest subterranean system to 420 miles.

The Mammoth Cave National Park and the Cave Research Foundation announced the underground discoveries as cavers continue to explore the vastness of the cavern system while verifying past research.

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