Divers exploring the Mediterranean have uncovered a gold treasure from a Byzantine shipwreck that stayed hidden underwater for more than a millennium. A Byzantine shipwreck discovered off the Croatian island of Mljet has revealed the largest collection of gold objects ever found on a shipwreck in the Mediterranean. The recovered gold objects weigh more than 21 ounces in total. Jeweled gold belt buckle recovered from a Byzantine shipwreck near Croatia’s Mljet Island. A collection of Byzantine gold artifacts recovered from a shipwreck near Croatia’s Mljet Island.