whether or not it's likely, it's worth considering that there could be an Atlantis/Wakanda scenario with a technologically advanced civilisation - human or not

whether or not it's likely, it's worth considering that there could be an Atlantis/Wakanda scenario with a technologically advanced civilisation - human or not - co-existing secretly with us on earth. given the state of human avarice, I find it hard to believe that there could be technology this advanced being held by the US, or any of the other powers, that wouldn't be being (ab)used to further dominate the world stage