Entertaining, almost convincing. I want to believe.
However we know it is one of...
* A hoax, like hundreds of other videos of UFO sightings.
* One branch of the military testing a piece of equipment another branch is not able to identify.
* A video showing an actual space craft built by aliens from another planet.
Consider which of these is most likely and which is least likely. Consider also that extraordinary claims should be backed by extraordinary evidence.
I'm surprised BBC picked this up.