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Blinkerwall: structure of 11,000 years in the Baltic Sea with 1 km reveals prehistoric hunting trap and changes view on Stone Age humans
In the autumn of 2021, geologist Jacob Geersen from the University of Kiel was conducting a field course in the Bay of Mecklenburg, in northern Germany, when a multibeam sonar survey revealed an unexpected structure on the seabed of the Baltic Sea. According to a study published in February 2024 in the Proceedings of the National Academy of Sciences, the identified formation, called Blinkerwall, is considered the largest megastructure of the Stone Age ever discovered in Europe, measuring about 971 meters in length.
The discovery, confirmed by divers and geophysical analysis, indicates that the structure was built approximately 11,000 years ago, when the region was still dry land. The find redefines the understanding of the technical and organizational capabilities of post-glacial hunter-gatherers in Europe.
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“You could see that there was something meandering across the map,” Geersen told NPR later. A line of stones, deliberately regular, extending for almost a kilometer. No random bumps. A line.
Discovery of Blinkerwall: sonar reveals linear stone structure on the seabed
During the mapping of the seabed, Geersen observed something unusual in the sonar data. Unlike the typical natural formations in the region, composed of irregular glacial deposits, what emerged was a continuous and organized line of stones.
According to a later report to NPR, the structure exhibited a clearly deliberate pattern, with a sinuous shape extending for almost a kilometer. They were not scattered blocks, but a continuous formation.
The Blinkerwall is composed of 1,673 individual stones distributed along 971 meters, at about 21 meters depth, near the town of Rerik. The average height of the structure is less than 1 meter, but its regularity is the most relevant element.
At the point where the structure changes direction, there is a central block weighing more than 11,000 kilograms, equivalent to the weight of seven compact cars. The presence of this block reinforces the hypothesis of deliberate planning and strategic structural use.
11,000-year-old submerged structure was built before the Baltic Sea existed
When the Blinkerwall was built, the Baltic Sea did not exist as it does today. The region was part of a post-glacial landscape composed of cold plains, lakes, and marshy areas.
About 11,000 years ago, the site was a ridge of dry land near a lake approximately 5 kilometers wide. The structure was erected on this elevation, oriented from east to west.
Submersion occurred only thousands of years later, during the so-called Littorina Transgression, about 8,500 years ago, when the advancing sea covered the area.
This geological context is essential to understand that the Blinkerwall was not built in a marine environment, but in a strategic terrestrial setting.
Scientific hypothesis: Blinkerwall functioned as a hunting trap for reindeer
The main hypothesis of the researchers is that the structure functioned as a guiding corridor for reindeer hunting, one of the main food sources at the time.
According to archaeologist Marcel Bradtmöller from the University of Rostock, the population of the region was less than 5,000 people and depended on the seasonal migration of these animals.
Reindeer tend to follow linear structures rather than crossing them. The wall, combined with the adjacent lake, created a natural funnel that directed the animals to a point where they could be hunted more efficiently.
This type of behavioral engineering demonstrates advanced knowledge of the environment and animal behavior.
Similar structures have been identified in other parts of the world, such as the so-called “desert kites” in the Middle East and submerged traps in Lake Huron, in the United States. However, the Blinkerwall is older and represents the first example of this type in Europe.
Prehistoric engineering: construction reveals planning and human cooperation
The construction of a structure nearly 1 kilometer long requires more than physical effort. It implies planning, territorial knowledge, and social cooperation.
The builders needed to understand migratory routes, anticipate seasonal movements, and coordinate collective work to position hundreds of stones along the landscape.
According to archaeologist Berit Eriksen from the University of Kiel, this type of structure indicates that the groups were not entirely nomadic, as previously believed.
The Blinkerwall suggests that there were already early forms of territorial organization and long-term planning thousands of years before agriculture.
Archaeological impact: discovery changes view on hunter-gatherers of Europe
For decades, the dominant model considered hunter-gatherers as highly mobile groups, lacking the capacity to significantly modify the landscape.
The Blinkerwall challenges this paradigm. Built about 4,000 years before the first megalithic structures in Europe and 8,000 years before Stonehenge, it demonstrates that large interventions in the environment were already occurring long before the Neolithic.
Ashley Lemke, an archaeologist at the University of Wisconsin-Milwaukee, emphasized that structures like this show that these populations not only survived but also planned and built.
She further suggests that this type of practice may represent an early stage that eventually led to the domestication of animals.
SEASCAPE Project: €1 million research seeks new submerged structures
The discovery of the Blinkerwall gave rise to the SEASCAPE project, led by the Leibniz Institute for Baltic Sea Research, with funding of nearly €1 million.
The project, ongoing between 2025 and 2027, brings together experts in geophysics, archaeology, and paleoclimatology to deepen the investigation.
Among the objectives are:
- Confirm the dating of the structure
- Identify associated artifacts
- Reconstruct the prehistoric environment
- Apply luminescence techniques for temporal analysis
Indications of other similar structures have already been identified in nearby regions, such as the Fehmarn Strait and the Flensburg Fjord.
This raises the possibility that the Blinkerwall is just part of a larger network of prehistoric traps now submerged.
The submerged structure in the Baltic Sea may reveal a network of prehistoric engineering
The Blinkerwall remains at 21 meters depth as a silent record of prehistoric human engineering.
Built 11,000 years ago, before the formation of the Baltic Sea, it demonstrates that Stone Age humans already possessed environmental knowledge, planning ability, and social organization much more advanced than previously thought.
The structure not only expands the understanding of the past but also suggests that other similar evidence may still be hidden beneath the sea, awaiting discovery.
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