Who knows?
We know that they are unidentified, hence the name unidentified flying objects.
Is there anything to legends of places such as Area 51, where in the movie “Independence Day”, they went to Area 51 and depicted research work on captured UFOs?
I’ve heard of cases where multiple witnesses to unidentified aircraft tell similar stories of what they saw, and also cases in which radar systems pick up the movements of unidentified entities.
Maybe someday we will know answers to the questions people have.
Is there anything to legends of places such as Area 51
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I was told 30 years ago that all the ‘good stuff’ had been moved to some secret base in either Utah or Idaho. What remains at Groom Lake is just our stuff being tested.