AN AMATEUR radio operator who set up a transmitter near the secretive Area 51 base has captured this extraordinary sound on camera.
Thousands of YouTube viewers have watched a man who has set up a radio transmitter within range of the top-secret military base in Nevada.
He explains he has done it specifically to capture any suspicious activity.
Then, something huge passes over him and makes a deafening sonic boom sound.
He said: “Holy s***, that scared the hell out of me.
He then looks around, confused as to what the source of the loud sound could have been.
But no aircraft is in sight, Dailystar.co.uk reports.
The man then rushes over to his radio transmitter to see if he can hear anything that may give some insight into the noise.
However, the signal then seems to scramble and a series of strange noises spurt through the speaker, before the video cuts.
The bizarre clip has only just been shared online after being recorded in May 2017.
Uploaded to YouTube channel TheArea51Rider, it has already racked up over 30,000 hits.
Viewers were shocked by the footage, sparking concerns if the US government could be hiding something.
One posted: “You know it’s probably a really good idea for there to be at least one guy out there doing this.
“It’s the people’s job to keep an eye on the government they pay for.”
Another added: “Crazy how you hear the sonic boom but you cannot see where it came from.”
Others were concerned for the man’s safety.
A viewer stressed: “Be careful man. You are messing with people who can make you disappear.”
This is not the first video of its kind.