The intact shipwreck of a cog, a ship used in the Baltic between the 12th and 14th centuries, has been discovered off the island of Gotland. The ship was discovered during a sonar survey and may be one of the oldest intact wrecks ever found.
Low oxygen levels, a flat sea bottom, and a lack of wood-eating sea creatures are some of the reasons the ship may be so well preserved.
The age and location of the wreck have led some to speculate that it may be the ship of Valdemar Atterdag, the legendary king who sacked Visby in 1361. [photo]