Alright, you guys totally missed the question I was actually asking.
IF U.F.O.'s don't have to be "Extra-Terresterial", and are instead from some, possibly 'mobile' oceanic base of non-humans, does THAT make them more likely to be 'real', than requiring them to travel inter-steller distances?
I will grant you that we have NO 'concrete', or 'absolutely solid' PROOF of a verified "U.F.O."...but...we do have TONS and TONS of anecdotal, first hand accounts, video, photographs, from government and private sectors, from both the trained and untrained eyes...of an "inconclusive" nature... Meaning only that it could NOT be positively identified.
If memory serves me, U.F.O.'s were sighted over Washington D.C. shortly after our first nuclear tests. The President dispached a committee that found only that 'whatever' it/they were, they were NOT a danger to the public.
'They' have appeared LOTS of places and throughout time. The world's military seems to take a very defensive posture towards them, often chasing them. (*Ever wonder why they have jets flying over large open air gatherings?)
IF U.F.O.'s existed, and WERE piloted by a non-human race of people, wouldn't it stand to believe that IF we were to interact, that we should follow regular disease control protocol? I mean, the first thing you'll have is a bunch of humans coming down with "Green Fever".
MAYBE their base is in the Bermuda Triangle...and when you 'see' them, they take you out, so you can't report back, what you saw...
(Maybe I should stear clear of the sci-fi section, for a while.)