About 100 tonnes of various items were raised from the bottom of the shipping channel in the Szczecin lagoon during modernisation works.
The most interesting findings from World War II include a Boeing B-17 Flying Fortress engine and fragments of the German battleship Lutzow, which was bombed and sunk by a British squadron in April 1945 in Swinoujscie.
Other discoveries include heavy anchors, anchor winding mechanisms, a piece from a U-boat gun and riveted buoys that separated shipping lanes in the 19th century.
One of the oldest items excavated is a medieval sword with a sheath.
The exhibition at the European Parliament building in Brussels presents a selection of the most valuable finds. (PAP)