The oldest wreck probably dates back to medieval times and could be up to 800 years old, while the others are likely from the 17th to 19th centuries, said Peter Norman, of Sweden’s National Heritage Board.
“They could be interesting, but we have only seen pictures of their exterior. Many of them are considered to be fully intact. They look very well-preserved,” Norman told The Associated Press.
Thousands of wrecks from medieval ships to warships sunk during the world wars of the 20th century have been found in the Baltic Sea, which doesn’t have the ship worm that destroys wooden wrecks in saltier oceans.