The grainy videos you have seen are just to tip of the hidden iceberg —
https://www.popularmechanics.com/mil...es-tell-truth/
The famous video was not the result of something caught by a flight of Navy jets which just happened upon a phenomenon while passing by, it was a patrol sent to investigate the culmination of several days of a series of radar trackings on a new highly sophisticated system which revealed unexplained teasing by unexplainable radar returns. Interviews of several Navy personnel recount that much longer and clearer recordings were made of the craft, but have been “disappeared.”