If there are no aliens on earth, then all these UFO and Undersea craft are all our own technologies?
As I learned more than 50 years ago protesting against the Vietnam war and the lies from the Pentagon, never believe a word the Pentagon says, without independent verification. Same for all American agencies.
As my other older friends say "When the eff did the Pentagon become a credible source?"
Several years ago we had one hovering over a local lake. A couple of guys captured it and brought it into the village for display. The date of this event was April 1.
They say there is no evidence of intelligent aliens on Earth.