My theory on UAP being man made.

So this is something that I’ve considered a lot since reading Graham Hancock’s work. What if the UAP phenomenon is the remains of an ancient advanced human civilization. According to Graham Hancock’s theory there was an advanced human civilization that existed ≈12500 years ago which utilized a form of technology that was completely different from our own. possibly using sound and other waves instead of electricity and gears. We know gravity is a wave, and the it’s been stated that these things utilize gravity as a form of propulsion. If we encountered this technology would it not appear utterly alien to us?

So, recovered bodies and non human biologics aside, what if what were seeing is akin to drones? The autonomous leftovers of an ancient human civilization carrying out tasks without any real control. Potentially they’re attracted to radiation, large sources of energy and pollution whatever it may be.

This isn’t a deeply fleshed out theory, but it’s something I’ve been thinking about alot. Id love to hear your input guys.