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Medieval wreck, a possible Cog. 3D Model
A shipwreck was recently found in the Stockholm archipelago. The wreck is from the Middle Ages and is mostly submerged in mud. Several details indicate that it is a cog, It dates most likely from the 14th century. The ship is 23–25 meters in length and seven meters wide which is comparable to the Bremer cog. It has had one mast with a square rig. More shipbuilding details indicate it being from the Middle Ages, such as protruding deck beams with unusually high knees and a very simple made windlass. When cog ships were introduced around the 12th century on the seas they were a brand new, large and powerful type of ship that came to dominate large parts of the trade around the Baltic Sea for centuries.