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TOP SECRET U.S. Government Tunnels - Cities Of The Underworld (S4, E2) - Full Episode

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HISTORY

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Don explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities...right under our feet. See more in Season 4, Episode 2, "America's Military Underground."

Watch all new episodes of Cities of the Underworld, returning soon, and stay up to date on all of your favorite The HISTORY Channel shows at history.com/schedule.

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