That is certainly the fringe theory of the long lost civilizatin of Mu (contintent in the Pacific?). Apparently it, Atlantis, and another empire essentially sub

That is certainly the fringe theory of the long lost civilizatin of Mu (contintent in the Pacific?). Apparently it, Atlantis, and another empire essentially sub-orbital bombed themselves into non-existence causing entire landmasses to submerge. That's the fringe, out there theory anyway.