Have you all not read the Navy UFO reports? Or the government medical report of what happens to people who have been exposed to UFOs and how to treat them? Or read about that P-51 mustang that chased a UFO back in the 40s above the US (when it was pretty much the fastest plane on the planet and certainly in the US) just to get outran by it and later destroyed by it?
This isn't a "do you believe" sort of deal. This is a "we have hard data from multiple Arleigh-burke class destroyers and multiple warplanes of unidentified objects pulling maneuvers that are physically impossible for any existing manmade aircraft, and then jumping into the water in what looks like a larger UFO under the surface".
Do your research using accredited sources (DOD reports, PopMech, gov medical reports) and there is zero question. They have been in the ocean for a long time and send up drones all the time. They are likely unmanned probes, since we have been hearing about sea-based ufos since the voyage of Columbus.