Wolfgang Haverkamp is a German writer who firmly places Atlantis on the Mid-tlantic Ridge^(a). He claims that the area of the island was 80% that of the Iberian Peninsula. He suggests that the demise of Atlantism may be the consequence of a pole shift following an encounter with an extraterrestrial body by the earth.

^(a) http://www.science-explorer.de/reports/gedanken_atlantis.htm