A cleaning worker became accidentally locked inside an old, rarely-used holding cell in the basement of a courthouse in Copenhagen. The employee, while cleaning the building, was inadvertently shut inside the cell, finding herself without a phone and unable to call for help. The courthouse in Copenhagen was almost empty at the time of the incident, complicating immediate discovery of the situation. Fortunately, a single, small detail – specifically, a protruding object – ultimately alerted authorities to the cleaner's plight. Rescue teams were then dispatched to free the worker from the holding cell. The incident highlights potential safety concerns within the Copenhagen courthouse’s older infrastructure. The worker was unharmed and the circumstances surrounding the accidental lock-in are under review.