In 1979, a false Soviet missile warning appeared inside NORAD's command center at Cheyenne Mountain—a fortress buried beneath 2,000 feet of granite and built to keep America's military warning systems operating during a nuclear war. During the Cold War, governments built extraordinary underground facilities beneath mountains, luxury hotels, quarries and motorway tunnels to protect military commanders, political leaders and even thousands of civilians.

This video explores 10 underground fortresses, from America's Cheyenne Mountain Complex and the secret Greenbrier bunker to Britain's Burlington headquarters, Switzerland's Sonnenberg Tunnel and China's enormous 816 underground nuclear plant. Discover the blast doors, shock-absorbing structures, hidden communications systems and survival supplies designed to keep these facilities running—and why some were abandoned, repurposed or left untested against the nuclear attacks they were built to withstand.

Thank you for watching: Inside the 10 Underground Fortresses Built to Survive a Nuclear War

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With great passion for mega constructions I created this channel. With extensive and detailed research as well as impressive video editing, I want to make the most fascinating mega constructions worldwide accessible to you - for all those who are just as enthusiastic about constructions. Subscribe and welcome to the Signum Team!