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A narrow, hand-cut tunnel discovered cutting into a much older Stone Age funerary monument in Germany is raising fresh questions about what people were doing underground in the late Middle Ages. Archaeologists say the passage, an example of a so‑called Erdstall, may have served as a hiding place, but its deliberate placement inside a prehistoric grave complex also leaves open the possibility of clandestine “cultic” activity notes Live Science . The find emerged during excavations ahead of wind turbine construction near Reinstedt (a district of Falkenstein/Harz) in Saxony‑Anhalt, on a rise known as the Dornberg. The medieval tunnel was dug into loess and cut directly through a trapezoidal ditch associated with the Baalberge culture (4th millennium BC), a landscape already