"The harbor, which already existed at those times, was easily reachable. The wreck lies just 160 feet offshore Giglio Porto," Ciabatti said.
With his colleague Paola Rendini, Ciabatti excavated part of the ship in the late 1980s, establishing that the vessel was 49 feet long and 16 feet wide.
"It wasn't a huge ship, but it was not easy to maneuver either, especially during a storm," Ciabatti said.
The jars, dishes and other items recovered from the ship are now on display at the permanent exhibition "Submerged Memories" at the Spanish Fortress museum in Porto Santo Stefano, near Grosseto.
The show reveals that many other wrecks lie off the Tuscan island. Indeed, heavy ship traffic passed through the 8-mile channel separating the Giglio island from the Argentario peninsula.
One ancient vessel, known as "Le Scole wreck" lies at a depth of 160 feet, not far from the vicious piece of rock now embedded in the Concordia's hull.
Two other Roman wrecks rest near Punta del Lazzaretto, not too far from the Concordia's stern. Other ancient wrecks lie at the northern end of the island, near Punta del Fenaio, Punta del Morto, Cala Calbugina and Secca della Croce, where sharp reefs line the shore.