Per 
SCP-4558
Object Class: Keter
Special Containment Procedures: SCP-4558 undergoes constant surveillance from satellite and drone, and has a 8.5 meter tall perimeter wall that goes 5.5 meters below the ground, with guard posts every 50 meters, manned by foundation staff armed with long range rifles, the wall is built in a 2 km radius from containment site ███. any humanoid who exits the facility is to be detained and reported to site directors immediately. Subjects entering SCP-4558 are to be genetically cataloged, and outfitted with surveying equipment. On exit, they are to be verified of their identity, through rigorous genetic and behavioral testing, If a subject exits SCP-4558 and does not pass the given tests, they are detained at site ███-█.
Description: SCP- 4558 is an extensive facility, that spans an area of 1 square kilometer. the facility resembles a foundation containment site, it is labeled Site-███. This facility appears to be in a state of containment breach, though no non-human entities have been viewed exiting SCP-4558. The interior of SCP-4558 seems to re-arrange at random if the interior is without surveillance. SCP-4558 is observed to contain 30-40 SCP objects at a time, however, over 400 different SCP objects have been observed since containment. It is believed that these SCP's are copies, due to the fact that all SCP objects found in SCP-4558, can still be found at their original containment site. These 'copies' are labeled as instances of SCP-4558-1 and are not able to leave SCP-4558. Specimens of SCP-4558-1 each have their respective containment, that resembles their original containment unit [See Addendum 1-A]. It has been observed that 'staff' from Site ████, including D-class, and security personnel, though there have been incidents where research staff exit, often there is an individual of the same identity outside of SCP-4558. [See Incident report 43-G]. Instances of SCP 4558-1 do not have any influence outside of SCP-4558. D-Class personnel sent into SCP-4558 are outfitted with chest mounted wireless camera [See attached documents for full equipment list]. Any object that is successfully removed is to be confiscated and contained on site.
Addendum 1-A: Observed SCP-4558-1 instances and replica containment units
SCP-096 -Seeing this version of SCP-096’s face does not aggravate the original SCP-096
SCP-173
SCP-049
SCP-012
SCP-035
SCP-008
SCP-066
SCP-076-Does not have stated control over facility.
SCP-106 -Does not take victims to “Pocket dimension, simply kills them by unknown means
SCP-148
SCP-178
SCP-205
SCP-294-Does not dispense any material that would damage SCP-4558
SCP-413
SCP-682
SCP- 939
SCP-1025
SCP-002
SCP-009
SCP-093-Does not function
[See attached file for full list]
Incident report 42-G: An individual exit SCP-4558, that resembled site director █████. They were immediately detained and given medical attention. They were suffering advanced effects of SCP-009, It appears that any instance of SCP-4558 is destroyed once is passes the entrance. Subject died due to the effects of SCP-009. Analysis revealed that DNA structure differed slightly from Site director ████, site director was notified and interviewed, no connection was found.
Incident report 89-B
DATA EXPUNGED
