Beneath the Greenbrier Resort in West Virginia sits a massive subterranean bunker, fit to sustain life in case of a nuclear attack. The Greenbrier Bunker remained one of the US' top Cold War secrets until 1992, when it's existence was uncovered by a Washington Post reporter.

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Experts explore mysteries of abandoned subterranean phenomena around the world, sharing their impressive stories, unique origins and the secrets they still keep hidden underground.

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