SCP-XXXX prior to containment
Special Containment Procedures: SCP-XXXX is to be deactivated and held at Site-22. SCP-XXXX is to be held within a 7,140 by 7,140 meter wide containment cell made from reinforced lead-lined steel. SCP-XXXX's containment cell is to have bullet proof observation windows located on the northern wall, any Class-D interaction with SCP-XXXX must be observed by 3 or more personnel with a clearance level of 3 or higher. 4 armed guards are to be stationed at SCP-XXXX's containment cell, and prepared to deal with hostile instances of SCP-XXXX-1.
Description: SCP-XXXX is an aircraft of unknown origin. SCP-XXXX's exterior is constructed from steel, this steel is unable to be physically damaged in any known way. SCP-XXXX appears to have windows, however these are actually solar panels attached to the exterior. The purpose of these solar panels is unknown, as they don't appear to power anything inside of SCP-XXXX. SCP-XXXX is powered by a battery located in the center of SCP-XXXX's interior. SCP-XXXX's battery, designated SCP-XXXX-2 is 3 x 3 meters, and resembles a cube. SCP-XXXX-2 is suspended in mid air in the center of SCP-XXXX via anomalous means, as there is nothing magnetic to hold it in the air.
SCP-XXXX will go through a period of exterior inactivity every 2-4 months, as the exterior lights will shut off. This period has been observed to last from 2-4 weeks, and is considered normal. During this period, faceless humanoid creatures wearing face masks, designated SCP-XXXX-1, will emerge from SCP-XXXX via a door located on the top of SCP-XXXX. SCP-XXXX-1 instances are invariably hostile towards humans. If a human comes into physical contact with an instance of SCP-XXXX-1, the SCP-XXXX-1 instance will attempt to rip off the face of the human. If the SCP-XXXX-1 instance is successful, they will remove their face mask and equip the humans face. After equipping the humans face, the SCP-XXXX-1 instance will shriek before vanishing from sight. SCP-XXXX-1 have been observed praying inside of SCP-XXXX, implying higher brain functions than first thought.
SCP-XXXX's interior, photo taken by Class-D personnel






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