Swedish treasure hunters have captured images of a mysterious wreck in the Baltic Sea . It 's estimated around 100,000 objects , mostly shipwrecks , are littered throughout the region . Deep - sea salvage company Ocean ##ic uses thermal imaging to search for wrecks .
Swedish treasure hunters have captured images of a mysterious object in the Baltic Sea . It 's estimated around 100,000 objects , mostly shipwrecks , are littered throughout the Baltic . Deep-sea salvage company Ocean Explorer uses sonar imaging to search for wrecks .