I'm duplicating this in Gen Dis just to be on the safe side.

Today 9 Oct 20:00 BBC Two except Northern Ireland (Analogue), Wales (Analogue)
Just off the southern coast of mainland Greece lies the oldest submerged city in the world. A city that thrived for 2000 years during the time that saw the birth of Western civilisation. An international team of experts uses the latest technology to investigate the site and digitally raise it from the seabed, to reveal the secrets of Pavlopetri.
More here
http://www.bbc.co.uk/programmes/b015yh6f