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Islands.com on MSNExplore The US' Largest Underground Lake On This Bucket List Glass-Bottom Boat AdventureTennessee simply delivers on southern charm ... However, listed by the Guinness Book of World Records as the largest ...
Sweetwater, Tenn.? When a 13-year-old boy discovered what is now the world’s second-largest underground lake, he had to crawl through a muddy hole deep inside a cave and throw balls of dirt into ...
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