Twelve cannons dating back to the 18th century were retrieved from an unknown shipwreck resting on the bottom of the Baltic Sea.
Bearing a mint date of 1771, the cannons have been identified as Swedish.
The wreck of the Swedish Navy ship rests at a depth of 130 feet (40 meters). Researchers have mapped a total of about 40 cannons and other cargo in and around the site.
The Polish Maritime Museum in Gdansk, Poland, plans to display the cannons after cleaning and restoring them. This work will take about 4 years, said Iwona Pomian, head of the department of underwater research.
Over the next couple of years, researchers plan to continue the exploration of the site located about thirty nautical miles from the north western town of Ustka, Poland.
Located in Northern Europe, the Baltic Sea is bounded by the Scandinavian Peninsula, the mainland of Europe, and the Danish islands.
The brackish inland sea is about 1,000 miles (1,600 kilometers) long and has an average depth of only 180 feet (55 meters). During history, the Romans and later the Vikings built a trade empire around the Baltic Sea.
The area suffered from piracy in the 12th century before the Hanseatic League, the Dutch, and the Swedish Empire dominated the body of water.