Wreck of Danish Warship Dannebroge Discovered in Copenhagen Harbor

Marine archaeologists have discovered the wreck of the Dannebroge, a 19th-century Danish warship sunk by Admiral Horatio Nelson and the British fleet, on the seabed of Copenhagen Harbor. The discovery was announced by Denmark’s Viking Ship Museum on Friday, April 3, 2026, exactly 225 years after the Battle of Copenhagen in 1801.

The Dannebroge, which served as the Danish flagship during the conflict, was commanded by Commodore Olfert Fischer. The vessel measured 48 meters in length and was the primary target of Admiral Nelson’s fleet during the engagement.

Excavation Challenges and Timing

Divers are currently working in a race against time to unearth the wreck before the area becomes a construction site for a new housing district being developed off the Danish coast. The excavation is taking place 15 meters beneath the waves in conditions characterized by thick sediment and almost zero visibility.

The Viking Ship Museum has been leading the underwater excavations for several months. Among the findings at the site, divers have discovered a cannon believed to be from the flagship.

Historical Context of the Battle

The Battle of Copenhagen in 1801 was a brutal naval clash that lasted several hours. Admiral Nelson and the British fleet attacked the Danish navy, which had formed a protective blockade outside the harbor. The British objective was to force Denmark to leave an alliance of Northern European powers that included Sweden, Prussia, and Russia.

The conflict resulted in thousands of casualties. During the fighting, the Dannebroge sustained heavy fire from the British fleet. Cannon fire tore through the upper deck of the flagship, and the ship eventually exploded after incendiary shells sparked a fire on board.

Archaeological Significance

Morten Johansen, the head of maritime archaeology at the Viking Ship Museum, stated that the discovery is a significant part of Danish national feeling. While many accounts of the battle were written by spectators, Johansen noted that the wreck provides a unique opportunity to understand the actual experience of those on board.

we actually don’t know how it was to be onboard a ship being shot to pieces by English warships and some of that story we can probably learn from seeing the wreck

Morten Johansen, head of maritime archaeology at the Viking Ship Museum

The site has been mapped by archaeologists, with images of the wreck’s layout being used to guide the recovery efforts. The Associated Press was the only international media outlet granted access to the underwater site.