They are now awaiting permission to excavate the wreckage, one of the oldest ever found in the Swedish capital, hoping it will shed light on shipbuilding techniques and trade in the 14th century.
Experts say they might be able to bring the ship up on land, as was done with the 17th century warship Vasa, which is now housed in a museum that is one of Stockholm’s main tourist attractions.
Parts of the wreckage are protruding from the brackish sediment at a depth of about 10 meters in the Riddarfjarden bay leading into the heart of Stockholm.
Archeologists found it last year when examining the planned site for a new train tunnel.
They have now dated the ship to between 1350 and 1370, and believe it sank sometime in the 1390s.
Shipwrecks have a decent chance of being well-preserved in the low-salt waters of the Stockholm archipelago because of the lack of wood-eating shipworms.
If the entire ship (the size and type of which are unclear) is still intact, its cargo could give historians a better idea of trading that took place in the area at the time.
The National Maritime Museum is awaiting permission from the government to dig out the remaining parts of the ship.