The mysterious footage shows a part of the space station, and that for no apparent reason, the dark perspective begins to get lighter, as if some kind of dark circular object is passing lower. It keeps getting clearer, and lighter, as the shadow goes its way. It is possible to perceive a rounded edge as the strange figure goes out of perspective until finally we can see the planet Earth.
The video was posted to the Streetcap1 channel. In its caption, the channel said it was not entirely certain the object was a "huge mother ship or any kind of alien spacecraft," but that "it certainly seemed unusual."