Nationalmuseet - Museer, forskning og bevaring

Researchers to investigate whether Costa Rica shipwrecks are Danish slave ships


In the next few days, marine archaeologists from the Viking Ship Museum and the National Museum of Denmark will be diving down to the remains of two ships off the coast of Costa Rica. The investigation seeks to determine whether these are the wrecks of two 18th-century Danish slave ships.

The marine archaeological investigations will make it possible, for the first time, to document whether the ships are Danish. Samples will be taken from both the ships’ timber and the bricks that were part of the cargo more than 300 years ago. The work is a collaboration between Costa Rica and Denmark.

We have known the history and location of the ships for several years, but this is the very first opportunity we have had to actually take a substantial amount of samples, which can hopefully document the origin of the ships, thereby expanding our knowledge of the history of Denmark and Costa Rica,” says the leader of the project, David John Gregory, senior researcher, adjunct professor and marine archaeologist at the National Museum of Denmark.

Costa Rica has known for some time about the two shipwrecks, which are located in shallow waters off the coast of the country in Cahuita National Park. For many years they were believed to be pirate ships. But in 2015, the discovery by US marine archaeologists of yellow bricks on one of the wrecks gave rise to new questions about the history of the ships.

Andreas Kallmeyer Bloch, a marine archaeologist and curator at the Viking Ship Museum, has been working to determine the origin of the ships for several years.

“We have worked hard to reach this point and we are very pleased that, hopefully, we can now identify the shipwrecks. This is the first time that an excavation has been made underwater in Costa Rica, which is why we are assisting. Costa Rica does not have its own marine archaeologists, but we have been working in this field in Denmark for many years,” says Andreas Kallmeyer Bloch.

It was the discovery of yellow bricks in one of the shipwrecks that aroused the researchers’ interest. These bore remarkable similarities to bricks manufactured in Flensburg for use in Denmark and the Danish colonies in the 18th and 19th century. In other European countries, different bricks were fashionable for construction. 

The impending investigation of bricks and timber from the ships will help determine whether the wrecks are the remains of the two Danish slave ships, Fridericus Quartus and Christianus Quintus, which, according to historical sources, sank off the coast of Central America in 1710.

Rebellion and dramatic shipwrecks

Written sources tell us that in 1708 the two Danish ships sailed from Copenhagen via West Africa towards Saint Thomas in the West Indies.

Over several months of sailing along the coast of West Africa, the holds of the ships were filled with hundreds of slaves and made ready for the long voyage across the Atlantic. 

In the spring of 1710, the two ships were in the Caribbean Sea. During the voyage across the Atlantic, however, they had gone off course. They sailed nearly 2,000 kilometres further west than their intended destination – the Caribbean Island colony of Saint Thomas in the Danish West Indies.

Food and water rations were running low on the ships; the situation was desperate and the crews of the two ships mutinied.

Fridericus Quartus was set on fire. Christianus Quintus had its anchor cut, after which the ship sank in the surf. However, exactly where and how this happened is still unclear.

The voyage from Copenhagen via West Africa to Central America is well-documented. There are accounts of the journey in historical archives, not only in Denmark, but also in Spain and Central America. There are also accounts by crew members who survived the ordeal and subsequently returned to Denmark or Norway, where they recounted their version of the incident to the royal tribunal. These files still exist in Denmark’s colonial archives.

If it is confirmed that these wrecks are the remains of the Danish ships, the project will form the basis for exploring the dramatic story of the two slave ships and the people whose fate was linked to them.

The investigations represent a collaboration between the two National Museums in Costa Rica and Denmark, the Viking Ship Museum in Roskilde, the Archaeological Commission of Costa Rica, the government body SINAC (Sistema Nacional de áreas de conservación Costa Rica) and Centro Comunitario de Buceo Embajadores y Embajadoras del Mar, a local NGO in Costa Rica.


The National Museum of Denmark via Cecilie Weinholt (Head of Communications) at or +45 41206017

The Viking Ship Museum via Rikke Johansen (Team Leader of Communication, Marketing and Sales) at or +45 51208285



The coast in Cahuita National Park, where the ships are located just off the coast.
The coast in Cahuita National Park, where the ships are located just off the coast.
One of the shipwrecks is measured.
One of the shipwrecks is measured.
The seabed, where one can see the one shipwreck by the bricks.
The seabed, where one can see the one shipwreck by the bricks.

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