Hyperborean Humanity. THE SECOND EXTRATERRESTRIALS CONTINGENT
Over time, in the period that we know as Mesozoic in the Tertiary Era, other beings from ALPHA CENTAURI arrive who settle in what would be called the Hyperborean, in present-day Greenland, Finland, Norway, Sweden, northern Europe.
They live in cities, one of which would be the mythical and legendary capital Tule or Tollán, mentioned in the Scandinavian and Germanic legends.
They were beings of white race and of great stature (over 3 meters), Odin was one of them. At this time dinosaurs populated the planet.
Due to the instability of the planet and the meteoric rain (65 millions years ago), they dig galleries below the surface, where they also settle.
Finally it is impossible for them to endure and they end up leaving via ships or with their advanced technology opening a dimensional door that they leave open, which has been accidentally seen several times in history.
Some survivors who did not leave are still here, and have been associated with different civilizations.
See:
https://cosmicsong.org/index.php/papers/523-humanity-s-history-and-the-cosmic-plan