Per 
Item #: SCP-XXXX
Object Class: Safe
Special Containment Procedures: SCP-XXXX is to be kept in a standard storage unit at Site-██. Level 2 personnels accessing to SCP-XXXX for testing or exploration requires approval from two (2) level 4 personnels. Due to final exploration (See SCP-XXXX Exploration Log E), further testings and explorations of SCP-XXXX are suspended under O5 command. (See Incident SCP-XXXX-1)
Description: SCP-XXXX is a large metal door measured 7 feet (7,0 inches) height and 3 ¾ feet (3,6 inches) width. Analysis of components that made Scp-XXXX are mostly iron, alloy and yet unknown materials. When fitted in enclosed doorway to building/room with other doorways, windows or other entrances (Trapdoors, Vents, etc), SCP-XXXX will instantaneously create an ongoing pathway(s) that leads to series of identical interior dimensions of the same building while original interior and exterior dimension is unaffected. When creating pathways, SCP-XXXX is capable of coping objects/materials presented in the original interior, thus includes technologies, vehicles, foods and beverages, except living organisms (See SCP-XXXX Testing Logs). If SCP-XXXX is fitted to a building with electricity, interior dimensions will display normal properties such as turning on/off television or lamp, the meaning of this is unknown. Determining the exact distance of pathway is unsolvable as exploration conducted by remote controlled drone footage shows farest beyond possible for building or exterior dimension and at it was conclusive that the pathway is infinite.
When completely unfitting SCP-XXXX from building, the pathway to interior dimensions will disappear instantaneously, any duplicate objects taking out or placed in the original interior of the building prior unfitting SCP-XXXX are unaffected. Mapping out the size and layout of interior dimensions by any means is effectively impossible as each time SCP-XXXX is unfitted and refitted to the same building but creates a new pathway to interior dimensions, despite damages and interactions prior. Personnels that entered the pathway prior unfitting SCP-XXXX are presumed lost. Using GPS or other communication devices to contact personnel inside interior dimensions are proven sufficient, including remote controlled drones and units, if SCP-XXXX is unfitted then all contacts and connections are severed.
Any exterior entrances beside SCP-XXXX will have its own pathway and appears that pathway itself does not follow the rules of Euclidean geometry. Breaking through wall, floor or ceiling inside interior dimensions will result in opening identical interior and pathway accordly. Other remains recovered inside interior dimensions, coupled with evidences during explorations, suggests that the pathway created by SCP-XXXX contains unknown entities, phenomenon and extradimensional surroundings.
Addendum 1; Discovery: SCP-XXXX was discovered on █/██/2017 in an abandoned apartment building in the town of ███████, Wisconsin. It came to attention of the foundation after reports of several civilians went missing in the residential area, also coupled with rumors of “magic house” attraction hosted by man named █████ ████████, it was opened every few nights for three weeks until apparently closed down at that time of reports. Upon investigation, field agents discovers that most rooms on the first floor are decorated with circus theme props and finds SCP-XXXX ajar in a room with few small boards titled “The Endless Door” which leads to a decorated room with an exit. Few minutes of investigation, field agents discovered a corpse identified as █████ ████████ in bedroom on second floor, apparently commit suicide by thorat slit with a knife, a handwirten note was found few feet away from subject that says “I’m sorry. I didn’t mean to take them away. What on earth would that door do if I…I tried to get them back but I couldn’t. Oh please god forgive me. Please.” Shortly after sending over medical team then containment team, one of field agents enters through SCP-XXXX for examination then exits the outside but instead finds an identical room in the opposite position with a metal door that leads to another room and next. When the containment team arrives and conduct examination, one of them was ordered to enter the other side of the anomalous interior by the exit door which leads to the identical interior and results are the same. When containment team unfitted SCP-XXXX for further examination, anomalous interior demainfest without a trace and later remainfest instantly when refitted it. Afterwards SCP-XXXX was secured and sent to a temporary containment unit at Sector-██ for research. Witnesses in the discovered area were given Class A ammestics and a cover story of arson results the deaths of missing civilians held captives by unknown groups of now deceased terrorists that caused it is implanted. Upon investigation in █████ ████████’s home, a journal was recovered and revealed a location of junkyard where the subject first discovered SCP-XXXX. Investigating Junkyard yielded no anomalous activities presented and searching into origins of SCP-XXXX is ongoing.
Addendum 2; SCP-XXXX Testing Logs: All testing logs of SCP-XXXX are abridged and transcripted below.
Addendum 3; Exploration Logs: All exploration logs of SCP-XXXX are listed below; authorized personnels refer to exploration log A to E for transcripted documentations.
SCP-XXXX Exploration Log E - This following log is for Class-A or higher personnel only. Unauthorized viewing of this file will result immediate termination of personnel and considered a possible breach of foundation and international law.
Addendum 4; Recovered Journal Entry:
Addendum 5; Incident SCP-XXXX-1:
Addendum 6; Additional Information:
