"Thus far nine ancient wrecks have been discovered in Montenegro and eight in Albania that span the period of the 6th century B.C. through the 4th century A.D.," said Royal.
According to Royal, three of the shipwrecks discovered this season are associated with a flourishing wine trade industry in what is now central Croatia.
The trade developed shortly after the Roman entry into ancient Illyria, a region in the western part of the Balkan Peninsula which included present-day Albania.
"Large cargoes of these amphoras were shipped down the eastern Adriatic coast from Croatia, along the modern Montenegrin and Albanian coasts to about Vlore where most traversed westward and rounded Italy into the western Mediterranean," said Royal.
The sites will be left unexplored, and the retrieved jars restored to the wrecks, until local archaeologists will be in a position to carry the excavations.
"These finds provide each country's government the opportunities to protect their cultural heritage, train their first maritime archaeologists, and collaborate with established institutions in further study," Royal said.