'Sunken Cities' at Mia unlocks ancient mysteries long submerged

Franck Goddio points out a detail in the Stele of Thonis-Heracleion.
Underwater archeologist Franck Goddio points out a detail in the Stele of Thonis-Heracleion, which was an important clue that the lost cities of Thonis and Heracleion, long believed to be different places, were actually one.