Does uap ever have to land?

Long time follower. I try to keep up to date. But I was wondering. With all the sightings and first hand knowledge, do any of these thing land? Do they go back to a mothership? Obviously, we’re taking our best guesses and it’s conjecture on our part. But, I’d like to speculate where they go. Inter-dimensional or nuts and bolts, or both. How does anything stay stay afloat? Thanks for listening.