Unearthed: Season 11, Episode 4

11 - 4: Sunken City of Helike: The Hunt for the Real Atlantis

Located along the Gulf of Corinth, the Greek city of Helike vanished in 373 B.C.; archaeologists believe they've found the ruins of the great lost metropolis. Using CGI, experts re-create the city's final moments and reveal its links to the greatest lost land of all -- Atlantis.