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LEXINGTON, Ky. (FOX 56) – There is big news coming out of western Kentucky.

Yes, literally.

An announcement came from Mammoth Cave National Park as explorers have charted an additional six miles to “the longest cave in the world”.

During the 50th anniversary celebration of the Flint Ridge-Mammoth Cave connection which earned Mammoth Cave the title of longest cave in the world, bringing the grand total to 426 miles.

“The additional 6 miles of cave is spread out in various sections throughout the cave system and were mapped and documented through hours of survey work completed by our partner, the Cave Research Foundation (CRF),” said Superintendent Barclay Trimble. “It is very fitting that we can now announce the new miles during our anniversary events celebrating years of great work accomplished by the CRF. Our teams have come together to mark this important milestone and we hope the community will take advantage of some special opportunities to learn more about the CRF and even be able to speak directly to the history makers themselves.”

Mammoth Cave adds six miles to it’s known mapped length, bringing the total to 426 miles. (Mammoth Cave National Park)

The 426 miles is just what has been officially mapped out and the total depth is still unknown.