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    Inside NORAD's nuclear threat assesment bunker

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Inside NORAD's nuclear threat assesment bunker

CNN's Scott McLean goes inside the North American Aerospace Defense Command's bunker in Denver, North America's first line of a defense from a nuclear missile.

Inside NORAD's nuclear threat assesment bunker

CNN's Scott McLean goes inside the North American Aerospace Defense Command's bunker in Denver, North America's first line of a defense from a nuclear missile.