America's Book of Secrets: Exposing Area 51's Undercover Operations (Part 2)

It is one of the most covert military bases on American soil, protecting the nation's most confidential research and development. For decades, the highest levels of government had denied its existence. But behind the barbed wire fences and surveillance cameras are secrets...Go inside the most famous secret military base on Earth to expose the high-tech security, undercover operations, and most outrageous claims surrounding the 575 square miles of "restricted" space. What actually goes on at Area 51? See more in part 2 of Season 1, Episode 4, "Area 51."

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