In the night to 11 September 2024, part of the Carolabrücke, a bridge over the Elbe in Dresden, collapsed. An expert report found hydrogen-induced stress corrosion in the prestressing steel. Damage to many tendons had most likely gone undetected despite regular and proper inspections. In July 2026, the public prosecutor closed the investigation and found no sign of a criminal offense. Engineers then asked a new question. Could the inspection methods in use detect this kind of damage at all?