Eh, been done
Not.
Face it: Finding new ways of killing other human beings is the only thing that human beings are really good at.
Bfl
One theory of UFOs is many are actually submersible and go back underwater after zooming out of sight. “USO” for submersible.
Chinese carefully hid such things as a mysterious pyramid which they deliberately obscured with tons of soil and planted shrubs and trees. And most of their UFO reports are quickly suppressed and the witnesses silenced.
The common theory among ufologists (I’m not one) is that the military in US and Russia especially have reverse engineered alien artifacts and vehicle parts to produce composite resin stealth aircraft bodies, various breakthroughs in surveillance and high tech devices and heat shields for the space program.
If true (I’m not convinced) then Chinese could be showing their latest project of that kind.
Eh, been done