Divers Race a Pipeline to Save a 400-Year-Old Baltic Wreck

Underwater archaeologists rarely get to choose their schedule, and a team from the University of Warsaw had less choice than most. Five divers from the university carried out 22 dives on a roughly 400-year-old wreck in Germany's Bay of Greifswald, working against the clock before construction for a gas pipeline could bury the site.

Found by accident

The wreck turned up in 2023 during preparatory work for an LNG pipeline. Because dredging was already planned, there was time for only a short diving campaign. The results have now been published in the International Journal of Nautical Archaeology, as reported by DeeperBlue.

Conditions were far from the clear blue water most divers picture. The remains lay in about 7.6 meters (25 feet) of water under heavy silt. In that murk the team recorded and protected a section of hull from a clinker-built vessel, the construction style in which hull planks overlap one another, and recovered a range of small finds.

What came up

Among the objects brought to the surface were an anchor, lengths of rope, shoe soles and what may be part of a bilge pump. The researchers single out several of these as rare items linked to a ship's own equipment rather than its cargo.

Underwater archaeologist Michal Grabowski recalled that a photograph of the collected objects was enough to convince him they had come from a wreck.

Tree-ring analysis of the timbers places the ship's construction between 1626 and 1639. Some of the wood is charred, which could point to a fire as the reason the vessel went down, but the team stresses that this has not been established.

Questions that may stay open

The study is unusually frank about its limits. With no cargo found and only a fragment of hull preserved, the authors say the ship's name, home port, destination and the circumstances of its loss cannot be identified. The survey also covered only a narrow strip of seabed inside the pipeline corridor, which is now a safety-restricted area. No more remains were found within that strip, but the authors note that further parts of the wreck could lie outside it.

Why it matters to divers

The project is a reminder that much of the seabed's history is uncovered by infrastructure work rather than planned exploration, and that the window to document it can be very short. For sport divers who come across historic material, the right response is to leave it in place, note the location and report it to the relevant heritage authority. Low-visibility, silty sites like this one also call for proper training and experience before anyone attempts to dive them.