Related and nearby caves At least two other massive cave systems lie short distances from Mammoth Cave: the Fisher Ridge Cave System and the Martin Ridge Cave System. The Fisher Ridge Cave System was discovered in January 1981 by a group of Michigan cavers associated with the Detroit Urban Grotto of the National Speleological Society. So far, the Fisher Ridge Cave System has been mapped to . In 1976, Rick Schwartz discovered a large cave south of the Mammoth Cave park boundary. This cave became known as the Martin Ridge Cave System in 1996, as new exploration connected the 3 nearby caves of Whigpistle Cave (Schwartz's original entrance), Martin Ridge Cave, and Jackpot Cave. As of 2018, the Martin Ridge Cave System had been mapped to a length of , and exploration continued.
Related and nearby caves At least two other massive cave systems lie short distances from Mammoth Cave: the Fisher Ridge Cave System and the Martin Ridge Cave System. The Fisher Ridge Cave System was discovered in January 1981 by a group of Michigan cavers associated with the Detroit Urban Grotto of the National Speleological Society. So far, the Fisher Ridge Cave System has been mapped to . In 1976 Rick Schwartz discovered a large cave south of the Mammoth Cave park boundary This cave became known as the Martin Ridge Cave System in 1996, as new exploration connected the 3 nearby caves of Whigpistle Cave (Schwartz's original entrance), Martin Ridge Cave, and Jackpot Cave. As of 2018, the Martin Ridge Cave System had been mapped to a length of , and exploration continued.