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Area 51 is one of the most secretive locations in the world.
Now, UFO hunters at SecureTeam 10 have released leaked footage which they claim shows an alien craft is hiding in the Nevada-based military facility.
The strange video appears to show a flying object hovering in the sky and then flying away - emitting a strange light as it sporadically moves side to side.
'It's one of the mysterious pieces in UFOlogy', said Tyler Glockner who runs SecureTeam 10 on the YouTube clip.
He described the footage, which was believed to have been filmed in the 1980s or 1990s, as a 'hidden gem'.
The unexplained object appears to be getting higher and higher and releases a strange light as the footage goes on.
The Nevada-based military testing facility has been a focal point of many conspiracy theorists and UFOlogists since the late 1970s, who claim that the base houses secretive alien technology.
The sprawling military complex sits between a dry lake bed to the North East, and a small mountain to the West.
Area 51 has been a hot spot for extra terrestrial enthusiasts because the government did not acknowledge its existence until 2013.
It has long been fenced off from the prying eyes of the public, with armed guards swarming the surrounding area.
'Area 51 has always been a magnet for those who believe the US Government knows a lot more about UFOs than they are prepared to reveal to the public,' Nigel Watson, author of the UFO Investigations Manual, told MailOnline.
'People like the late Boyd Bushman, a senior scientist who worked for Lockheed Martin, have declared that Area 51 is a base where extraterrestrial spacecraft and technology is stored and examined.'
Claims of alien conspiracies around Area 51 have largely been debunked.
But the site has been confirmed as a historic test site for military aircraft.
Famous machines developed there include the U-2 spy plane, SR-71 Blackbird, and the F-117A Nighthawk stealth fighter.
Images of the base are extremely rare, with any photographers brave enough to travel there kept far back from the perimeter by the base's many armed guards.
Area 51 is blanketed by a strict 23 by 25-mile (37 by 40km) no-fly zone for civilian aircraft.
Nearby viewpoints Freedom Ridge and White Sides Peak, which offer vantage points looking down on the base, are off-limits to the public.