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What Is the Deepest Underground Cave In the World and What Is the Longest Underground Passageway System?

April 26, 2017Cave deepest longest passageway system underground world

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What Is the Deepest Underground Cave In the World and What Is the Longest Underground Passageway System?

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The deepest cave in the world found up to 1992 is in France, the Reseau Jean Bernard. Its total depth, not just the length of its shaft, is 5,256 feet, almost a mile straight down. The longest system of underground passageways in the world is the Mammoth Cave system in Kentucky. The numbers change with new exploration, but as of