The Atlantean's Combustion

Tateria: Why would an advanced alien species that it comes and creates life or whatever be using combustion? Cole: On earth, I would have thought they just were the people 12,000 years ago. Tateria: What actually happened is most life on the planet just left prostate. Human civilization developed like the city of Atlantis developed technology. The humans that stayed behind it had no idea what was going on.