structures, as well as SCP-2431 and SCP-2946, as detailed in the 
previous sections (See exploration logs E-2378-1 through 4). On 
August 5th, 1997, SCP-2378 underwent its first observed transition 
period 3 months after genetic identification. 2 teams were within the 
structure during the transition, resulting in personnel becoming 
trapped in dense tissue, and loss of GPS contact with personnel. 


Show Addendum 2: SCP-2378-4 


Addendum 2: SCP-2378-4: 

SCP-2378-4 are manifestations of Natural Killer cells13 
1.5 min diameter. Direct physical interaction with any -4 
iteration by human targets or normal SCP-2378 cells 
lacking requisite MHC 1 receptors, induces 
SCP-2378-4's primary, secondary, and tertiary functions. 
First, it will release a series of compounds which 
permeate the target, regardless of protective equipment. 
Second, it will begin secreting large quantities of 
interferon y14. Finally, SCP-2378-4 will begin secreting 
chemical markers, which draw more SCP-2378-4 
instances in addition to phagocytic -3 instances. 


-4 instance's primary and secondary responses have a 
number of effects on human targets. For targets subject 
to the primary response: 


¢ Subjects immediately begin to feel ill, bloated, and 

swollen. 

Subjects will swell rapidly, often tearing clothing 

and protective gear. 

Subjects explosively burst. 

* Subjects parts rearrange and package into 
membranous sacks, and begin to resemble former 
cell components. 

« Phagocytes consume subjects remains. 


For individuals subject to the secondary response: 


* Subjects will begin feeling nauseous, woozy, and 
fatigued. 
* Subjects develop a fever, and begin hallucinating. 


In the event that any member of an exploration team 
comes into contact with an instance of SCP-2378-4, non- 
target members are advised to immediately swim in the 
opposite direction of pulse current, and exit to an A 
region. 


Exploration logs 
The following supplementary documents detail expeditions into 
SCP-2378. 


¢ E-2378-01 - Access Denied 
¢ E-2378-02 - Access Denied 
¢ E-2378-03 - Access Denied 
¢ E-2378-04 - Access Denied 


Footnotes 

1. How and why an individual becomes linked to the dome is poorly 
understood. Despite genetic screening and close observation, linked 
individuals share only a few key similarities, the most prominent 
involving some sort of extreme physical trauma. 

2. Effector molecules for adaptive extracellular immune responses 
which bind specific structural motifs. More specifically, IgA, which is 
produced as a dimer and blocks attachment to mucousal cell 
receptors by pathogens. 

3. With pulses taking place every 10 minutes. 

4. Analogous to the varying isoforms of IgG and IgM antibodies. 

5. SCP-2378-3 innate immune cell instances possess a series of 
Toll Receptors found to bind certain anatomical features of humans. 
Therefore, avoiding contact with these cells and wearing equipment 
which shields or alters the shapes is important. 

6. A human blood fluke normally acquired from water contaminated 
by giant snails. 

7. Averaging roughly 300 meters in height, and 200 meters in width. 
8. 2378-3 adaptive immune instances may bind surfaces that special 
altering equipment may prevent innate instances from binding, 
resulting in aggressive and fatal action. 

9. Due to the presence of "foreign" antigens. 

10. Though it is theorized that it may release the internal 
components of SCP-2378 into the surrounding area, including -3 
and -4 instances. Since these instances are able to move outside of 


liquid, as seen in the small number of Class 2 events to date, one 
could conclude that expiration of a linked subject would constitute a 
Magnitude 3 exposure event. 

11. Foundation officials were seeking to establish a site dedicated to 
microbiological and pathogenic anomalies, due to a lack of proper 
BSL-3 and 4 facilities. This site is now known as Site-234. 

12. Based on suspicion by some higher level Foundation staff at 
Site-234 that the anomaly was destabilizing. 

13. Cells primarily responsible for the innate immune response to 
virally infected cells. When MHC | is downregulated on cell surfaces, 
and falls under a specific threshold, e.g. 3 MHC's within a certain 
distance that bind and inhibit NK cells through an inhibition receptor, 
NK cells will begin a signal cascade in the target cell towards 
programmed cell death (apoptosis). 

14. An antiviral cytokine which increases nearby cells resistance to 
viral infection, while also inducing said cells to produce IFNy. 


« SCP-2377 | SCP-2378 | SCP-2379 » 


SCP-2379: Roach Motel 


Item #: SCP-2379 
Object Class: Keter 


Special Containment Procedures: Foundation agents embedded 
in meteorological agencies in the United States, Mexico and El 
Salvador are to monitor any potential hurricanes or other extreme 
weather. In the event that such weather develops, agents are to 
destroy all suspected infestation sites via incineration. Samples for 
research purposes are currently housed within Site-19 and 
Site-77. 


Monitoring of police reports and social media related to mobile home 
facilities are to be monitored for signs of SCP-2379's presence. 
Algorithms recognizing keywords frequently used to describe 
SCP-2379 infestations by civilians have been placed in major search 
engines to alert Foundation agents of possible infestation sites. 
These sites are to be dismantled and decontaminated by members 
of MTF-Psi-7 "Home Improvement". 


Any advanced infestations of SCP-2379 are to be destroyed via 
aerial incineration. Due to the ongoing presence of SCP-2379 
infestations across multiple jurisdictions, agents operating in these 
areas must be prepared to enact basic containment of SCP-2379 
and prepare them to be decontaminated. 


Civilians exposed to SCP-2379 are to be issued Class-C amnestics 
and enrolled in substance abuse recovery programs under the guise 
of an opiate addiction. 


Description: SCP-2379 is an anomalous species of fungus, found 
primarily around population centers within North America. Instances 
of SCP-2379 most frequently resemble mobile homes, but other 
instances resembling mother-in-law cottages and rows of portable 
toilets have been discovered. Additional growths resembling lawn 


ornaments, welcome mats, and crude humanoid figures have also 
been documented. 


When subjected to hurricane-force winds or similar weather 
conditions, SCP-2379 structures will dissociate and produce several 
hundred spores. Approximately 3% of these will survive, and reach 
their maturity within 24 hours of germinating. Mature instances of 
SCP-2379 are hollow, with test subjects describing the floors and 
walls as spongy. Occasionally growths resembling tables, chairs and 
kitchen sets are produced, although these are usually crude and 
unconvincing. Instances of SCP-2379 are fully mobile, using groups 
of small mycelium bundles to move. 


In order to entice an inhabitant, SCP-2379 will begin to produce an 
aerosol which induces euphoria in exposed subjects. This gas has 
addictive properties, and subjects affected by it are susceptible to 
suggestion and have difficulty with motor coordination. This effect is 
more pronounced in elderly subjects affected by SCP-2379. It has 
been documented as affecting individuals up to 4 km away from the 
SCP-2379 infestation. 


Subjects inhabiting SCP-2379 frequently attempt to convince any 
subject not currently residing in an SCP-2379 to move in. Individuals 
choosing to live in SCP-2379-affected buildings generally become 
more distrustful of outsiders and encouraging self-sufficient lifestyle 
choices such as growing food and producing their own tools. 


When the population of an SCP-2379 settlement reaches 
approximately 200 residents, all buildings will uproot themselves to 
begin traveling towards the largest and closest population center. 
Upon arriving, any uninhabited SCP-2379 instances will dissociate 
into spores, which will then infest all nearby structures. These 
buildings will be disassembled by fibrous fungus, and the materials 
apparently used to produce more complex structures such as hotels, 
motels, boarding homes, condominiums, and small businesses with 
residences. Eventually, the individual SCP-2379 instances will 
interconnect with one another and form an insular system. 


Once the SCP-2379 infestation has used all the available 
construction materials, it will begin moving towards the next largest 
urban population center and repeat the process. There is no known 


upper limit on the size that SCP-2379 infestations can reach. 


History: Development of SCP-2379 began in 1982, as a project by 
an independent group of mycologists in collaboration with 
Prometheus Labs, in order to create sustainable self-perpetuating 
housing out of fungus. Funding was provided by Prometheus Labs, 
which also provided fungal research materials and material support. 


In 1991, instances of SCP-2379 germinated and took the form of 
standalone research labs. After several fatalities, Prometheus Labs 
attempted to evacuate the facility. This was unsuccessful due to 
resistance from the staff members, and it is believed their behavior 
was influenced due to their long-term exposure to SCP-2379. 
Prometheus Labs personnel destroyed all infested materials via 
incineration and detained the resisting staff members. 


The Foundation became aware of Prometheus' connection to 
SCP-2379 after that company's collapse and is currently 
investigating the location of several of the associated researchers. It 
is believed that the current presence of SCP-2379 in the wild is due 
to an outside party obtaining samples of SCP-2379 after 
Prometheus Labs collapsed. 


« SCP-2378 | SCP-2379 | SCP-2380 » 


SCP-2380: The Left Kidney of Junior Researcher 
Ostergaard 


Item #: SCP-2380 
Object Class: Safe 


Special Containment Procedures: SCP-2380 is to be kept in 
Containment Locker 2380 at Site-39, with access barred to all 
personnel with a clearance level under three (3). In the event of any 
breach in containment, Junior Researcher Ostergaard is to be taken 
into protective custody by security personnel until containment is 
restored. Outside of controlled testing environments, bare-skin 
contact is not to be made with SCP-2380, and protective equipment 
is to be used at all times. 


Description: SCP-2380 is a human left kidney, a genetic match to 
one @stergaard, a Junior Researcher at Site-39 in ; 
Denmark. Neither the internal nor external structure of SCP-2380 
bears any notable deviations from that of an average human kidney. 
The cells of SCP-2380 do not differ from non-anomalous human 
kidney cells in any detectable way. All tissue remains healthy, 
however, despite the lack of blood flow to or from the object. 


SCP-2380 exhibits both a passive and active anomalous effect. 
Passively, SCP-2380 constantly rotates by currently unknown 
means, such that its superior pole is pointing toward Junior 
Researcher Ostergaard at all times. The active anomalous effects of 
SCP-2380 manifest when it is held or touched with bare skin by any 
human subject apart from Junior Researcher Ostergaard. Upon 
touching SCP-2380, the subject, henceforth designated 
SCP-2380-1, will attempt to implant SCP-2380 into Junior 
Researcher @stergaard by any means available. If surgical 
instruments or other sharp implements are accessible, instances of 
SCP-2380-1 will make use of them, but those affected have been 
observed to attempt the implantation without any tools or 


instruments of any kind. 


Worth noting is that Junior Researcher Ostergaard is still in 
possession of both of his kidneys, which appear to be healthy and 
fully functional. It is not known at this time what instances of 
SCP-2380-1 would do with Junior Researcher @stergaard's current 
left kidney if his abdominal cavity was successfully accessed. 


Upon removal of the kidney from the possession of affected 
SCP-2380-1 individuals, the active anomalous effects of SCP-2380 
will cease until it again comes into contact with exposed human skin. 
Previously affected SCP-2380-1 individuals will express a lack of 
awareness of their actions, but possess the notion that, while 
affected, they were attempting to implant "Ostergaard's kidney" 
using proper medical procedure (surgical scrubs, sterilized medical 
equipment, designated operating theater, etc.). This belief is 
maintained by SCP-2380-1 individuals with and without prior 
surgical experience, as well as SCP-2380-1 individuals without prior 
knowledge of Ostergaard's identity. No other anomalous or 
abnormal effects have been noted in former SCP-2380-1 individuals, 
nor in Junior Researcher Ostergaard himself. 


Recovery: SCP-2380 was discovered by Junior Researcher 
@stergaard, resting on his desk in Research Sector of Site-39, the 
morning of / /2011. Security footage from the morning of / and 
the preceding night do not show any evidence of entry into 
Research Sector before Ostergaard's arrival. Investigation of 
@stergaard provides no evidence that he was in any way aware of 
the existence of SCP-2380, nor anything anomalous regarding his 
kidneys, prior to the morning of / . 


Upon the arrival of Dr. , Ostergaard's immediate supervisor, 
SCP-2380 was picked up, and manifested its anomalous effects. Dr. 

grabbed a letter opener from a nearby desk and proceeded to 
pursue Ostergaard through the hallway until apprehended by 
security personnel. At this time, SCP-2380 fell to the ground and its 
effects ceased. As Dr. was taken into custody, SCP-2380 was 
retrieved by Officer —§, making the object's anomalous properties 
known when he attempted to breach Junior Researcher 
Ostergaard's abdominal cavity with a paperclip. 


« SCP-2379 | SCP-2380 | SCP-2381 » 


obsessive stalker who committed suicide to better follow the reader, 
and a spirit of a horribly deformed baby seeking the reader to kill 
and eat. Both produce associated hallucinations. 


Notes — | am not too proud to admit, | shat myself just a little. | tell 
you, | could smell that damned thing. Putting aside the direct 
applications, if we can figure out how it works, we could advance the 
whole body of amnestic research by twenty years. 


Money Entered: 500 Yen 

SCP-261 Powered or Unpowered: Powered 

Item Description: “CoCo Calavera”- A brightly colored cellophane 
pouch, with patterns associated with the “Dia de Muerto” Day of the 
Dead celebration in Mexico, text in modern Spanish, no 
manufacturer information. The label provides a short description of 
the holiday, and the tradition of candy skulls made and consumed 
on that day. The package is secured by a simple twist-tie. Inside is a 
small, three-dimensional candy skull, decorated with red icing in 
traditional patterns. It differs from traditional candy skulls on several 
points. Only one color, red, is used for decoration. The skull itself is 
a very dark brown, and appears to have horns sweeping back along 
the skull, along with sharpened teeth. 


The primary difference is, while traditional skulls are made primarily 
of sugar, this one appears to be made of pure crystallized coco. The 
structure is identical to that of granulated sugar, but there is no 
actual sugar present in the skull. The coco itself is not related to any 
recorded breeds of coco plants, and this may be the reason behind 
the hereto unobserved crystallization process. The skull itself is 
described as very bitter, with a sharp taste of chili peppers. 


Notes — There's something bothering me about this one. Can't put 
my finger fully on it, just something off about a black and red horned 
skull, maybe. How it manages to look exactly like sugar is another 
question. 


Money Entered: 500 Yen 

SCP-261 Powered or Unpowered: Powered