 SCP-450 is the death row block of the abandoned federal penitentiary. In distance from entrance to the execution chamber is approximately 166.5 meters. A complex pattern, drawn in human blood, is located on the wall behind the electric chair. This pattern slowly degrades over time due to normal environmental decay and must be maintained regularly. The cell block is inhabited by what appears to be one or more hostile spectral entities. Attracting the attention of said entities is invariably fatal, and may or may not occur due to one of the following criteria. Entering the cell block by any means other than the main door. Moving at a speed greater than 0.25 meters per second. Staying in the cell block for more than 25 minutes at a time. Entering the cell block more than once every 24 hours.