The following are the top 5 instances of government cover-ups regarding alien activity.

00:00 The Navy, Nuclear Weapons and UFOs
04:15 Inexplicable Flying Objects
08:41 US Government Sees More than We Know
12:34 Project Blue Book Attempts to Prove UFO Phenomenon
16:47 The Roswell Incident

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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

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