The Lost Sea: Exploring America's largest underground lake in

Deep in the foothills of the Smoky Mountains, about 50 miles south of Knoxville, Tennessee, sits an wonder 140 feet below ground: the largest underground lake in America

The Lost Sea, Sweetwater, Tennessee

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The Lost Sea Adventure: Exploring America's Largest Underground Lake

The Lost Sea Tennessee River Valley

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The Lost Sea: America's largest underground lake

The Lost Sea; America's Largest Underground Lake

The Lost Sea, Sweetwater, Tennessee

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The Lost Sea; America's Largest Underground Lake

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America's Underground Lost Sea Is So Vast It's Never Been Fully Explored