I'm pretty sure that which we call Atlantis existed before our moon crashed into Earth's atmosphere, breaking apart the main landmass, separating it into smaller continents, causing all types of destruction and chaos, accompanied by intense electrical/plasma visualizations witnessed in our skies. Prior to this event, it's incredibly likely our planet was a tidally locked body, never experience the effect of "Day & Night". Despite seeming hard to believe, from our ignorant "things have always been like this" standpoint, the arrangement we had was incredibly hospitable to Life.