many finds indicate that on this planet existed civilisations different and more advanced even than are own

Insane nonsense

check Velikovsky and Graham Hancock he wrote many books about the subject.

Velikovsky: “Russian, Israeli and American author, known for his fringe catastrophist theories, widely considered as pseudoscientific by mainstream scholars” (wiki)

Graham Hancock: “British author who promotes pseudoscientific theories. Hancock aims to erode trust in known facts and archaeological expertise” (wiki)

Definitely not opportunistic sociopaths trying to distort reality to fit their personal agendas. /s

Neither have any qualifications whatsoever in the subject of history or archeology.