Per 
SCP-6255
Object Class: Euclid
Containment Procedures: SCP-6255-1 is to be contained inside of [REDACTED] warehouse. Security agents are assigned to monitor primary facility entrances at all times. Civilians attempting to enter the facility are to be escorted off site by foundation agents. Unauthorized trespassers will be given amnesiacs and escorted off site. Any civilians found breaching facility grounds are to be given amnesiacs and escorted off site. SCP-6255-1 is to be contained behind a doorway leading into a room claiming to process high pressure heated materials. No access is permitted below B-Class personnel or without proper administration permission to gain access to SCP-6522-1. No personnel are to enter SCP-6522-1 without proper administration permission for testing purposes only.
Discovery: SCP-6255-1 was first discovered inside of a steel producing plant [DATA EXPUNGED] kilometres [REDACTED] outside of Caledon, Ontario. SCP-6255 was found by a worker who had discovered a door that was not previously there before. She attempted to climb the staircase but found that following the staircase defied her sense of logical time to climb to the highest accessible floor in the facility. The SCP Foundation was alerted of this phenomenon after an incident of a worker attempting to climb to the top of the staircase without return. All civilians on sight were given amnesiacs and a cover story was fabricated surrounding a mechanical malfunction causing an explosion, requiring all workers to be evacuated from the sight. The facility was purchased shortly after and all previous workers were laid off and given assistance in career searching by foundation agents acting as career managers. The facility underwent renovations to further contain SCP-6255-1.
Object Description: SCP-6255 is a phenomenon that occurs inside of SCP-6255-1, a doorway that leads into a tunneled staircase. Any being that enters SCP-6255 will find that the staircase leads to impossible spaces as it seemingly goes on forever. B-Class observers have attempted to shine light into SCP-6255-1 to find that all light is absorbed into the staircase.
D-Class test subjects have reported through radio communications that they feel a loss of special perception inside of SCP-6255-1 and have difficulty orientating themselves as going up or down the staircase. Foundation scientists cannot find an explanation to this phenomenon and hypothesize SCP-6255-1 to have special properties outside of our plausible realm of existence.
A-Class personnel have made tests with D-Class test subjects with different mental states. A-Class personnel have uncovered that test subjects with emotional stability issues are more likely to activate the phenomenon of SCP-6255 where they cannot return from the entrance in which they entered from. Test subjects with more emotional and mental stability were able to attempt to climb the staircase for approximately thirty minutes before attempting to exit the stairway, in which they succeed and return out of the entrance.
D-Class test subjects that cannot exit the SCP-6255 phenomenon have displayed signs of mental degradation over time, claiming loss of directional and gravitational senses. D-Class test subjects describe being able to climb up the vertical sides of the staircase. Test subjects that have succeeded in walking on the vertical walls of the steps also record a change in the direction of the stairwell that leads vertically up. Test subjects that attempt to step on this will then be able to walk up that staircase as well, in what would be described as a gravity-defying act according to plausible physics.
