UFO watchers have been left baffled by three massive "alien portals" which mysteriously appear below the International Space Station in bizarre footage.
The video appears to show a trio of circular shapes flying across the earth's atmosphere and just below the space station.
Conspiracy theorists Blake and Brett Cousins uploaded the strange footage to their YouTube channel.
Blake says: "We've got three strange anomalies drifting downwards just above the Earth's atmosphere.
"Is this something extraterrestrial?"
The footage then zooms in on the objects which reveal they seem to be some sort of circle with a hole in the middle.
To read more and view the video, click here.