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.
“God damn."
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.
To read more and view the video, click here.