This is the best summary I could come up with:

The so-called “Maderö wreck” was first discovered in the 1960s in the waters of the Stockholm Archipelago—a large group of islands scattered off the coast of mainland Sweden in the Baltic Sea.

The divers who found the wreck made a sketch of the site, which shows a large, partly disintegrated wooden hull, laden with bricks, from what seemed to represent a medieval vessel.

Then in the 2000s, further dives at the wreck underlined the medieval dating, although the archaeological documentation was neither completed nor published at this stage, leaving many questions unanswered.

In 2022, a team of researchers led by Niklas Eriksson, with the Department of Archaeology and Classical Studies at Stockholm University, conducted an investigation, which included the inspection and documentation of visible ship parts, as well as the taking of numerous samples.

“The reason we decided to have a closer look at the Maderö wreck is that we have limited knowledge about ships from this period,” Eriksson told Newsweek.

The team’s analysis also revealed that the wood used to construct the ship was felled after 1467, although the researchers determined that the sinking may have occurred closer to the turn of the 16th century.

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