In the 1950s and 1960s much of the town centre was damaged by landslides. It turned out that throughout the city's history, generations of Kłodzko's merchants had developed an extensive net of underground basements and tunnels. They were used for storage and, in times of trouble, as a safe shelter from artillery fire. With time the tunnels were forgotten, especially after the original German population was deported, and during the years after World War II many of them started to collapse, along with the houses above. Since the 1970s the tunnels were conserved and the destruction of the city was stopped. Another disaster happened in 1997, when the city was damaged by flooding even greater than that of 1938. However, the town quickly recovered.