Not aliens. High tech military equipment.
Most people fail to realize that what we know about the "latest" technology is about 20 years behind what presently exists, particularly in the areas of aviation/avionics and weaponry,
But muh bazillion dollar f35!
The Tic Tac craft that Pilots have been witnessing would literally be hundreds of years more advanced than we currently have.
Arthur C. Clarke's Thrid law
Any sufficiently advanced technology is indistinguishable from magic.
All it takes to go from 100 years ahead to 1 year ahead is a breakthrough.
That's like saying anything is possible, of course it is but logic would dictate that it is at minimum 100 years more advanced than current technology. That would be the logical assumption given the rate of technological improvements over the past 100 years.
They can apparently pass through ocean water without slowing down, and have inertial dampers. That would make them pretty advanced. If such things are even possible.
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