Per 
Item #: SCP-XXXX
Object Class: Euclid
Special Containment Procedures: SCP-XXXX is to remain in facility 753, constructed at the original site of the anomaly. The original entrance to the room is to be sealed with a standard class-III airlock system with at least 2 (two) guards with at least level 3 clearance posted in the secondary chamber at all times, and 1 (one) guard with at least level 3 clearance monitoring a class-II surveillance monitor.
The object currently designated SCP-XXXX-2 is to remain a specimen of the common house mouse (mus musculus) when active testing is not taking place. Replacement of SCP-XXXX-2 with Class I organisms (herbivorous or domesticated animals weighing less than 80 kg or undomesticated carnivorous animals weighing less than 10 kg) may be done at the acting researcher’s discretion, but for periods lasting no longer than testing. Replacement of SCP-XXXX-2 with Class II organisms (animals weighing more than the stated limits for class I or organisms of Class I weight exhibiting notable aggression) must first receive clearance from the acting Site Director. Any interaction within the chamber of any organisms designated Class III (Animals of Class II weight exhibiting notable aggression or Safe class SCPs) must receive clearance from acting Site Director and at least two staff members of security clearance level three or higher. Under no circumstances are any Class IV organisms (instances of biological SCPs designated Euclid or above) allowed within 1km of facility 753.
During replacement of SCP-XXXX-2 class V quarantine protocols are in effect, all personnel entering SCP-XXXX’s chamber must wear hermetically-sealed HAZMAT suits until the replacement procedure is complete.
2 (Two) class-D personnel are to remain inside the chamber for the purposes of collecting instances of SCP-XXXX-3, working in six (6) shifts over a 24 (twenty-four) hour period. During testing periods when SCP-XXXX-2 poses a threat to class-D personnel, defensive measures up to but not including firearms of any kind may be issued at the head researcher’s discretion.
Instances of SCP-XXXX-3 are to be placed in a suitable portable container. During standard containment (when all instances are that of mus musculus) the container should be a standard biological containment unit of size III or larger, and there should be enough empty units on site to contain at least 3 (three) days’ worth of production. Once a containment unit has been filled to capacity, the lid should be closed, and the container moved out of the chamber to an onsite ecosphere no less than ten and no more than twenty meters in diameter and the specimens released. Experimental containment procedures for instances of SCP-XXXX-3 are determined at the discretion of the head researcher but must be approved by a staff member of security clearance level three or higher before testing has begun.
In the event of a containment breach, the chamber is to be hermetically sealed and flooded with nerve agent VX (propanylaminoethylsulfanylmethylphosphinate.) Staff clearing the chamber afterwards are to prioritize reassigning SCP-XXXX-2 to a Class I organism, after which the remains of any instances of SCP-XXXX-3 or D-class personnel may be removed.
Description: SCP-XXXX is a wire cage in the shape of a hexagonal prism, roughly 15 cm to a side and 32 cm in height, with a flat silver plate 5 cm in radius attached to the domed top. The cage itself is able to be moved but loses all anomalous properties when moved more than 1m in any axis from the location it was discovered, GPS coordinates ██.█████˚N ██.█████˚E, altitude ███.██m, at the center of a series of underground ruins in northern Africa near the city of [REDACTED]. See Addendum.
SCP-XXXX-2 is an object of variable appearance, always existing within SCP-XXXX. SCP-XXXX-2’s appearance changes when an organism belonging to kingdom Animalia weighing more than 20 grams comes into contact with the silver plate of SCP-XXXX for more than seven contiguous seconds, after which SCP-XXXX-2 changes appearance to match that of the organism used, with mass being a constant. SCP-XXXX-2 does not appear to be animate beyond the transformations, never moving within SCP-XXXX, and is considered non-biological. The mechanism behind the detection of valid organisms is believed to be electrochemical in nature, due to the ineffectiveness of metal to insulate the plate from an organism atop it.
At intervals lasting no more than 70 and no less than 15 seconds, SCP-XXXX generates between 3 and 15 instances of SCP-XXXX-3. Specimens can appear in any space within the chamber regardless of line of sight and do so within 1/300th of a second. Creation interval and number of instances are affected by mass, temperament, and taxonomic group of the organism, as catalogued below, and instances of SCP-XXXX-3 appear within the chamber SCP-XXXX was discovered in.
Instances of SCP-XXXX-3 are organisms generated by SCP-XXXX and are identical in every way to the original organism imitated by SCP-XXXX-2, down to the genetic and molecular level. Such instances, however, differ from the imitated organism in two ways.
• When contained within SCP-XXXX’s chamber, instances of SCP-XXXX-3 can survive indefinitely without food, water, or oxygen, making either physical trauma or toxins the only way to neutralize specimens without removing them.
• When instances of SCP-XXXX-3 exit the chamber, whether alive or dead, they completely disappear within 72 hours. Video footage shows an instance existing in one frame, and completely gone in another. As such any testing involving removed specimens of SCP-XXXX-3 must conclude within this time frame. Personnel nearby when the disappearance occurs report a sharp cracking sound, pressure sensors have determined this to be due to air rushing in to fill the space once occupied by the specimen. Current theories assume that the mass used to generate instances of SCP-XXXX-3 is recycled in some way and stored in an extradimensional space within SCP-XXXX.
| Test # | Species | Mass | Interval | Number of Instances | Organism Class | Notes |
|---|---|---|---|---|---|---|
| 1 | cell-content | cell-content | cell-content | cell-content | cell-content | cell-content |
| 2 | cell-content | cell-content | cell-content | cell-content | cell-content | cell-content |
| 3 | cell-content | cell-content | cell-content | cell-content | cell-content | cell-content |
| 4 | cell-content | cell-content | cell-content | cell-content | cell-content | cell-content |
| 5 | cell-content | cell-content | cell-content | cell-content | cell-content | cell-content |
| 6 | cell-content | cell-content | cell-content | cell-content | cell-content | cell-content |
| 7 | cell-content | cell-content | cell-content | cell-content | cell-content | cell-content |
Addendum: Tests have shown that removing SCP-XXXX from its functional location only postpones the generation of new organisms, when SCP-XXXX is returned to the center of the chamber all instances of SCP-XXXX that would have been generated appeared at once, breaking the 15-organism rule.
Addendum 2: SCP-XXXX was brought to Foundation attention when a team of archeologists contacted animal control concerning a snake problem at one of their digs. When SCP-XXXX’s chamber was breached by the diggers it triggered what witnesses called a “wave of snakes,” autopsies show that 60% of civilians on-site died due to acute encephalitis caused by the venom of the East Carpet Viper. Forensic and archeologic analysis has concluded that the production of SCP-XXXX built up in the sealed chamber over the centuries, causing enough pressure to allow the snakes to flow in the method described in eyewitness accounts, disappearing after 72 hours. Survivors were administered class B amnesiacs and released, the deaths were explained as a buildup of flammable gas, the harvest of which is the current cover story for Foundation facility 753’s existence.
