Check out the real Atlantis, Helike.
One of the most notable objectives in the field of underwater archaeology is the location and the excavation of Eliki, the ancient Achaean City. Located east of Aegeion it sunk along with its habitants into the Corinthian Gulf after the terrible earthquake in the winter of 373/372 BC. The discovery of a town along with its edifices, temples and sculptures will be an extremely significant event since the destruction occurred during the classical period. Thus its finding would contribute a great deal to our knowledge of classical architecture, town planning, art, etc. Many efforts have been made to locate the ancient town, however its exact position has not yet been determined and the opinions of scientists diverge as to whether or not Eliki presently lies on the sea bottom or on the shore.