Highly advanced civilizations once dominated the Mediterranean long before the Greeks and Romans. Using cutting-edge archaeology, experts reveal new evidence of the catastrophes that brought doomsday to these long-lost superpowers. This is a mashup of S03E05 "Hunt for the Real Atlantis" (Knossos) and S06E03 "Lost City of Troy." 

Experts investigate the secrets of seven lost cities; investigators use advanced aerial scanning, underwater drones, and 3-D mapping to reveal why these enigmatic civilizations disappeared.