Pipeline Workers Found a 400-Year-Old Shipwreck in the Baltic, and One Object on Board Still Baffles Experts

A 17th-century clinker-built sailing vessel, discovered in 2023 during survey work for an underwater gas pipeline in Germany’s Bay of Greifswald on the southern Baltic Sea, has been dated by tree-ring analysis of its oak timbers to wood felled between 1626 and 1639. The rescue excavation led by University of Warsaw underwater archaeologist Michał Grabowski also recovered a baffling artifact: a yellowish clay brick with four or five conical holes set tightly into an oak block, with no definitive function identified. Off Germany’s Bay of Greifswald, the kind of underwater survey that usually produces charts and clearance reports instead turned up a badly deteriorated wooden sailing vessel buried in heavy silt about 25 feet down, right in the path of a planned gas pipeline near Lubmin.

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