Travel Kentucky Newly Discovered Pathways Extend Kentucky's Mammoth Cave by 8 More Miles That brings the total number of mapped passages up to 420 underground miles. By Melissa Locker Melissa Locker Melissa Locker writes about food, drinks, culture, gardening, and the joys of Waffle House Southern Living's editorial guidelines Updated on January 4, 2023 Fact checked by Jillian Dara Fact checked by Jillian Dara Jillian is a freelance writer, editor and fact-checker with 10 years of editorial experience in the lifestyle genre. In addition to fact-checking for Southern Living, Jillian works on multiple verticals across Dotdash-Meredith, including TripSavvy, The Spruce, and Travel + Leisure. brand's fact checking process Share Tweet Pin Email Kentucky's Mammoth Cave was always an enormous natural sight that claimed the title of world's longest cave system, but in 2021 researchers announced that it's even longer than they previously thought. Mammoth Cave National Park took to its Facebook page to share the news that a dedicated team of cave lovers had unearthed an additional eight miles of passages that have now been officially added to the Mammoth Cave system. That brings the total number of mapped passages up to 420 underground miles, Kentucky's local CBS affiliate, WLKY, reported. Posnov/Getty Images Every year, volunteers from the Cave Research Foundation have continued the exploration of the system of caves that make up Kentucky's sole national park, the Park reports. The intrepid spelunkers and cave lovers creep through crevasses, bravely duck into tiny, dark openings, and use tools like range finders, inclinometers, and good old measuring tapes and compasses to survey newly discovered passages. Some turn out to be dead ends, while others lead to natural wonders far underground. Wherever the passage leads them, they follow, making careful notation of rock piles and formations, noting artifacts or underground rivers, and keeping detailed records of everything they find and sketching the passage as they go. It's undoubtedly complicated, exhausting work, but it can pay off. Such is the case with this latest addition of eight new mapped miles of cave. While Mammoth Cave National Park was officially dedicated at as a national park by 1941, becoming a World Heritage Site in 1981, and an International Biosphere Reserve in 1990, there is clearly a lot more to explore. As the National Park noted on its Facebook page, "When it comes to discoveries in Mammoth Cave, there truly is no end in sight!" Was this page helpful? Thanks for your feedback! Tell us why! Other Submit Sources Southern Living is committed to using high-quality, reputable sources to support the facts in our articles. Read our editorial guidelines to learn more about how we fact check our content for accuracy. WLKY News. Researchers discover 8 more miles of Mammoth Cave in Kentucky. Updated September 14, 2021. National Park Service. Mammoth Cave cave mapping.