The other two ships recorded as sunk in the battle, the Danish warship Lindormen and the Dutch armoured merchant vessel Swarte Arent, were found at around 24m in 2012, also during work on the tunnel.
Of the Delmenhorst, Morten Johansen of the Viking Ship Museum says: “We found an oval – ship-shaped, you could say – pile of stones densely overgrown with seaweed. It was quickly clear that it was ballast stone from a larger vessel, and between rocks and algae we could see the ship’s frames and inch-thick cladding planks.
“On the very first dive, the sun shone down through the water, and it made dozens of burst and melted pieces of bronze cannon twinkle like gold between the charred wreckage.” Four different sizes of cannonball were also found.
“The ship will remain in the environment where it has been for 400 years,” said Johansen. “We hope that in the future someone will find a way of deriving more knowledge from such a wreck than we are able to extract today.”
The divers have also been taking some 30,000 photos to build a 3D model of the Delmenhorst.
“In this way, the shipwreck can be exhibited digitally at the museum, even though it is still on the seabed,” said Johansen, adding that work was already under way on an exhibition about the three Fehmarn shipwrecks set for 2021.