In Greece, underwater excavations of Lechaion, ancient Corinth's partially submerged harbour town, reveal the infrastructure of more than a thousand years of flourishing maritime trade. Researchers from the Greek Ministry of Culture and Sports and the University of Copenhagen are using cutting-edge methods to uncover the configuration and scale of the harbour. Corinth ranked among the most economically and militarily powerful, and enduring, cities of the Greek, Roman and Byzantine periods. The city had an exceptional geographical advantage in the North East corner of the Peloponnese and controlled the Isthmus that facilitated land travel between Northern and Southern Greece, and...