Strange loud siren sound recorded in Monument, Colorado (video)

What was this mysterious ‘siren or vacuum’ sound heard in Monument, Colorado end of March 2017?

There was no weather happening at the time, but the recorder lives near the United States Air Force Academy. Could it be related?

That’s really a mysterious sound! Anybody has an idea?

Follow us: Facebook and Twitter

SHARE

6 COMMENTS

LEAVE A REPLY

Please enter your comment!
Please enter your name here