This is Plato's description of the disappearance of Atlantis:
"Now in this island of Atlantis there was a
great and wonderful empire which had rule over the whole island and
several others, and over parts of the continent, and, furthermore, the
men of Atlantis had subjected the parts of Libya within the columns of
Heracles as far as Egypt, and of Europe as far as Tyrrhenia. This vast
power, gathered into one, endeavoured to subdue at a blow our
country and yours and the whole of the region within the straits;
........ But afterwards there occurred violent
earthquakes and floods; and in a single day and night of misfortune
all your warlike men in a body sank into the earth, and the island
of Atlantis in like manner disappeared in the depths of the sea. For
which reason the sea in those parts is impassable and impenetrable,
because there is a shoal of mud in the way; and this was caused by the
subsidence of the island."
http://www.sacred-texts.com/cla/plato/timaeus.htm
See y'all next week.