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Cave explorers discovered eight miles of tunnels at Mammoth Cave, bringing the total length of explored passageways in .

Mammoth caveUnited statesBarren countyMammoth cave national parkCaverna high schoolLisa troyerPaula ratliffElizabeth winklerDerek bristolJoe duvallEd klausnerChristopher clarkRafinesque hallElizabeth miller cave research foundationCave national park systemCave research foundation