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Double sonic booms heard over secretive military base Area 51 has sparked claims the CIA is hiding alien technology at the top secret site.
Footage has surfaced of two loud thumping sounds as a pair of F-22 fighter jets fly over the secretive base.
Conspiracy - Theorists - Sonic - Booms - CIA
Conspiracy theorists claim the sonic booms show the CIA is secretly testing alien technology or hypersonic aircraft.
A clip posted to YouTube by UFO Seekers, taken in the Nevada desert near where Area 51 is based, shows the F-22 craft cut across the sky at speeds of up to 1,500 mph (2,400 kph).
Jet - Vapour - Trail - Wake - Booms
As one jet speeds away, leaving a distinctive vapour trail in its wake, two sonic booms are heard.
The loud cracking sounds are caused by shock waves produced when aircraft travel faster than the speed of sound.
Users - Burst - Flames - Plane - Engines
Some users reported seeing a burst of flames burst from the plane's engines.
YouTube commentators claimed the flybys were a cover-up for work on extra-terrestrials within the base.
User - Good - Citizen - 'They - Dont
User Good Citizen wrote: 'They have to be testing cloaking ufos. Sonic bombs dont just happen for no reason.'
User Matt Smith commented: 'I think the regular fighter jets, F22's etc, were there as a distraction, to cover for the real testing of experimental hypersonic aircraft.
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