Holding Facility 21-B post SCP-XXXX swarm event.
| Assigned Department | Site Director | Research Head | Assigned Task Force |
| Biomimetics Division | Dir. Hans Langston | Sr. Researcher Lee | PTF 1-χ "Terminators" |
Special Containment Procedures: All variants in swarm and/or individual behaviour must be immediately documented, employing suitable countermeasures under Project APSU; the primary supervision of which is attributed to Site Director Langston and Sr. Researcher Lee. Project APSU is to be implemented in a chronological, triphasic system, according to the following phases: Research, Containment, and Restoration.
Current macro-scale containment efforts are ongoing.
Description: SCP-X is the preliminary designation given to the emergence of anomalous swarming behaviours in all world rat (rattus rattus) populations. Present investigations display no evident divergences from typical rat behaviour and biology at an individual level, with the anomalous effects however appearing to manifest as an emergent property of collective rat behaviour.
Currently recorded swarm behaviours are as follows:
- Disruption of public services, such as sewage facilities, public transportation, waste disposal, electricity services, etc.
- Complete consumption of all unsecured food stores.
- Decimation of crops.
- Strategic avoidance of exterminator crews.
- Complete consumption of livestock.
- Destruction of property and movement of substantial amounts of debris.
These behaviours are accepted as ‘intentional’ by means of the swarms’ emergent intelligence, however they produce ‘unintentional’ or indirect consequences, including increased spread of disease, food shortages and public panic.
In effect, SCP-X represents the spontaneous and simultaneous acquisition of highly sophisticated swarm coordination by all rat populations, with this degree of collective intelligence unseen in any organism groups over time.
The following is an evaluation of the unique nature of SCP-X’s behaviour in comparison to other swarm anomalies, by Dr. C. Miler of the Anomalous Biomimetics Division.
Throughout the Foundation’s containment history, the prevalence of swarm anomalies has forced our cumulative understanding of swarm behaviour1 to an inordinately high level compared to the complexity of the anomalies’ behaviours themselves. This is mainly resulting from the majority of ‘swarm’ anomalies being insectoid rather than mammalian or avian - the exact reason why our department classifies them as ‘swarms’ as opposed to ‘herds’ or ‘flocks’. This disproportionate distribution aids our research because of the biological similarities between these swarm anomalies, allowing our predictive systems to easily adapt to new testing data.
However, every pattern has exceptions, and under the unique circumstances where we encounter non-insectoid swarm anomalies with complex behaviour; the task of rebuilding our system(s) proves impractically large.

PROJECT APSU
PHASE I: RESEARCH
Research Memorandum:
- Individual instances of SCP-X are to be tested for thaumaturgical and memetic influences, as well as other deviations from baseline biology resulting in differing behaviour.
- Division of Anomalous Biomimetics commissioned under combined supervision of the Artificial Intelligence Applications Division (AIAD) and the Department of Zoology.
- Permission to operate Machine Learning Algorithm Beta-2 (hereafter ‘M-LAB’) granted by O5-4.
| TEST | RESULT | COMMENTS |
| 60kg animal meat left near storm drain. | Swarm emerged after 73 seconds, consuming the meat in under 15 seconds before retreating into sewage system. | As expected, the storm drain provides an easy exit point from the sewer. Yet, exactly how the swarm smells the food from so far remains unclear. |
| 80kg contaminated meat left near storm drain. | Swarm emerged after 45 seconds, devouring entire animal carcass within 11 seconds, before retreating into sewage system.2 | Considering all nearby food stores have been secured, it's no wonder they’re ravenous. |
| 80kg of the same contaminated meat left near storm drain. | Swarm emerged after 23 seconds, observing the carcass for 15 seconds before retreating.3 | They appear to have communicated that this type of meat cannot be eaten. In addition, The vast increase in swarm size cannot be attributed to normal reproduction, so either they have merged with another swarm, or have developed an enhanced reproductive cycle. Perhaps both. |
| 100kg live ram given small dose of sedatives and left near storm drain. | Swarm emerged after 20 seconds, instantly devouring the entire ram in under 7 seconds, despite the screaming and struggling. | The swarms appear to be constantly searching for any source of food, alive or not. It’s worth noting the increased speed of both discovery and consumption of the animal; they must know this location is a reliable food source. |
| 75kg human male (D-6743) blindfolded and instructed to wait near storm drain. | 2 individual SCP-X instances ran past D-6743 and under a line of cars. No other movement observed. | The lack of activity could be due to the unnatural smell of synthetic cloth fibres or perhaps the toxic implication of a bright orange jumpsuit. More testing required. |
| D-6743 is blindfolded and wearing dull coloured clothing soaked in animal blood. Instructed to wait near storm drain. | No activity. | Interesting. |
Addendum X.X: PoI-8372 Interview
Interviewer: Site Director Hans Langston
Interviewee: PoI-8372
<Begin Log>
PROJECT APSU
PHASE III: RESTORATION TERMINATION
POI-8347 TERMINATION PROPOSAL
PROPOSAL:
"Terminate PoI-8347, therefore neutralising SCP-X and its anomalous adaptations." - (Dir. Langston)
O5 COUNCIL VOTE SUMMARY:
Unanimous agreement for the termination of PoI-8347
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| PENDING ETHICS COMMITEE APPROVAL |
| PLACEHOLDER |
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