00:00Area 51 stayed a secret for decades.
00:02Then, in 2013, the US government officially
00:05acknowledged that Area 51 exists,
00:07but they never revealed everything that happened inside.
00:09Many believe advanced spy planes like the U-2
00:12and other classified aircraft were tested there,
00:15which may have caused many UFO sightings.
00:19Was Area 51 hiding aliens?
00:22Or simply America's most advanced military technology?
00:27The full truth remains a mystery.
00:31Follow for part four.
00:33We're part four, where we'll reveal
00:35the strange warning signs surrounding Area 51.
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