More than 200 years after being sunk by Adm. Horatio Nelson and the British fleet, a Danish warship has been discovered on the seabed of Copenhagen Harbor by marine archaeologists.

Discovery Amidst Development

The wreck, identified as the 19th-century Danish warship Dannebroge, was found while archaeologists worked in challenging conditions – thick sediment and near-zero visibility 49 feet beneath the waves. Divers are working quickly to unearth the vessel before the area becomes a construction site for a new housing district off the Danish coast.

A Historic Find

Denmark’s Viking Ship Museum, leading the monthslong underwater excavations, announced the findings on Thursday, March 31, 2026 – exactly 225 years after the Battle of Copenhagen in 1801. Morten Johansen, the museum’s head of maritime archaeology, stated, “It’s a big part of the Danish national feeling.”

The Battle of Copenhagen

The Battle of Copenhagen saw Nelson and the British fleet attack and defeat the Danish navy, which was attempting to protect the harbor. The clash, lasting several brutal hours, is considered one of Nelson’s most significant victories. The British aimed to force Denmark out of an alliance with Russia, Prussia, and Sweden.

Dannebroge's Fate

The 157-foot Dannebroge was Nelson’s primary target during the battle. It sustained heavy damage from cannon fire, and incendiary shells ignited a fire onboard. Johansen described the experience of being on such a ship as “a nightmare,” explaining that wooden splinters from cannon impacts caused the most harm to the crew.

Origins of a Phrase

The battle is also believed to be the origin of the phrase “to turn a blind eye.” After disregarding a superior’s signal, Nelson, who had lost sight in one eye, reportedly remarked, “I have only one eye, I have a right to be blind sometimes.” He later offered a truce, leading to a ceasefire with Denmark’s Crown Prince Frederik.

Recovered Artifacts

The stricken Dannebroge drifted northward and exploded, the sound reportedly echoing across Copenhagen. Archaeologists have already recovered two cannons, uniforms, insignia, shoes, bottles, and even part of a sailor’s lower jaw, potentially belonging to one of the 19 unaccounted-for crew members.

Race Against Time

The dig site is threatened by the construction of Lynetteholm, a large-scale project to build a new housing district in Copenhagen Harbor, expected to be completed by 2070. Divers, like Marie Jonsson, a maritime archaeologist, face challenging conditions, often relying on touch in the silt-filled waters: “Sometimes you can’t see anything, and then you really have to just feel your way, look with your fingers instead of with your eyes.”

Insights into the Past

Experts confirm the recovered wooden parts match historical drawings, and dendrochronological dating confirms the ship’s construction year. Archaeologists hope the discoveries will provide new insights into the battle and the lives of those who fought in it. Jonsson noted the personal connection gained from recovered items: “There are bottles, there are ceramics, and even pieces of basketry…You get closer to the people onboard.”