Up to 24 hours after time of posting (regardless of stamp value 
used), the posted item will arrive at its destination, along with any 
other standard mail items. The postmark on the envelope is not that 
of the Royal Mail company, but one similar to [REDACTED]. 
However the original letter posted will not be found inside the 
envelope, instead replaced with an instance of SCP-521-X. 


SCP-521-X appear to be letters written during periods of conflict, 
often addressed from combatants to family members or friends. 
Comparison of historical records places the bulk of SCP-521-X 
items as occurring during World Wars 1 and 2, see Addendum 521- 
E for examples. An exception is SCP-521-27, see Addendum 521-7 
for more information. 


A current theory suggests the items retrieved during testing are 
letters originally undelivered. Foundation Researchers are currently 
attempting to trace possible relatives of the writers to verify this 
hypothesis. 


Once a suitable letter has been posted and delivered, SCP-521 will 
disappear from its current position, and reappear elsewhere inside a 
urban location within 150km. Its current method of movement is 
unknown; however, any obstruction to the letter slot is removed 
during transit. No other parts of SCP-521 are affected during its 
transit. Any mail items posted between activation and delivery will be 
processed normally. After SCP-521 has completed a transition to 
another area, its effect will activate on the next suitable piece of 
mail. 


Addendum 521-E: Below are short excerpts from letters received 
during testing of SCP-521. Copies of the original letters are available 
to be viewed on the Foundation intranet. 


SCP-521-1 


| told you in my airgraph a little about the journey here. 
Of course, | must not mention place names or any vital 
details. The boat trip did not seem overlong in spite of 
the confined space and lack of anything really important 
to do, but for part of the trip | acted as one of the anti 
aircraft gunners, doing two four hour turns of watch duty 


universe. Conclusions are that SCP-001 consists of 
multiple entities showing cognitive patterns that are 
indistinguishable from human, and that these entities are 
therefore susceptible to memetic effects. Since prior 
experiments have shown information feedback via the 
SCP data warehouse, a possible method of attack and or 
control has been developed. Protocol ZK-001-Alpha, 
when initiated, will cause a software viral insertion of a 
variety of memetic agents into the SCP database which, 
through the observed information feedback, should 
expose SCP-001 to the memetic effects of these agents. 
Protocol ZK-001-Alpha consists of three stages: 


1. Memetic agents inserted to promote calm and/or 
well-being 

2. Memetic agents inserted to promote sleep, 
unconsciousness or catatonia. 

3. Memetic agents inserted to cause death. 


Given the nature of SCP-001 and our limited interaction 
with it, it is not possible at this time to safely test Protocol 
ZK-001 -Alpha, and it is unknown if the universe can 
continue to exist without interaction with SCP-001. 


Scantron's Proposal: The Foundation 


UIU File 0041: Altered High School Building in , (Confirmed 
Anomaly 3) 


Object Class: 53 (Highly intrusive, unknown capabilities, unknown 
nature) 


Secure Containment Protocols: Confirmed Anomaly 3 (CA3) is to 
be surrounded by an electric fence no less than 30 feet high and 
guarded by the United States Army’s Platoon. Any footage or 
photographic evidence of CA3’s interior is to be excised as soon as 
possible, and all witnesses detained indefinitely. 


Under no circumstances should any personnel attempt to enter CA3 
or communicate with the persons inhabiting it. However, any person 
known to have been inside CA3 at any point must be detained and 
interrogated. 


A direct military assault on CA3 has been deemed unfeasible at this 
point, due to the unknown capabilities of the entity or entities by 
which it is controlled. 


Note: This is a summary, and it does not contain all information 
relevant to CA3. For detailed information regarding CA3, see UIU 
Files 0042 through 0218- Director 


Known Information: The Unusual Incidents Unit was alerted to 
CA3’s existence on September 7, 1954, when students attending 

High School reported that the interior of the building was 
vastly different than it had been at any point in the past. 


Upon discovery, CA3 exhibited several unusual, if not inherently 
paranormal, traits: 


¢ Nearly all walls in the facility had been replaced with steel- 
reinforced concrete, although several rooms were constructed 


of other materials for no readily apparent reason. All exterior 

windows had been covered from the inside. 

All student desks, personal effects, textbooks, and other 

materials expected of a public high school were completely 

absent. Lockers were still present, albeit significantly smaller 

and constructed of stainless steel. 

The arrangement, location, and size of rooms and facilities did 

not match blueprints for the school. Often, rooms would 

exhibit seemingly random modifications, although the number 

of changed rooms is currently unknown. 

¢ No less than seventeen electronic computers were found, 
each of which made use of state-of-the-art magnetic-core 
RAM. Prior to its classification as a confirmed anomaly, 
High School had no computers. All files on the computers 
were inaccessible, and the computers themselves are firmly 
bolted down. 

¢ The auditorium is inaccessible due to a large steel wall 
completely blocking the doorways. Attempts to move or 
damage this barrier have been ineffective. The extent and 
purpose of the barrier are unknown, as are the contents of the 
auditorium. 


A team sent into CA3’s interior to do a complete survey (Team CA3- 
O5) did not return, nor did a second team (Team CA3-O6) tasked 
with locating the first team. The facilities are currently under 
lockdown pending new containment protocols. 


Update: Twenty-three days after initial recovery, guards reported 
"white noise" emanating from CA3, the volume of the noise 
increasing the closer one got to the auditorium. Five hours later, the 
white noise stopped, although the sound of voices was audible from 
the interior of CA3. 


Upon further investigation, it was found that the building now 
contained a large number of persons, all of whom appeared to be 
wandering aimlessly through the facility. Notably, each individual 
was physically identical to a member of Team CA3-O6, despite the 
inhabitants of CA3 vastly outnumbering the members of Team CA3- 
O6. Attempts to interview or detain the inhabitants were thwarted by 
[CLASSIFIED]. The twelve members of Team CA3-O5 were not 


found. In addition to the aforementioned, the interior layout of CA3 
had changed significantly since the previous investigations. No 
mechanism which could explain this has been identified. 


Update: Three months after the previous incident, white noise was 
again heard emanating from the auditorium. This time, the decision 
was made to investigate immediately. It was found that most of 
CA3-2 (the designation given to the inhabitants of CA3) had 
gathered near the doors of the auditorium. A circular hole roughly six 
feet in diameter had formed in the steel barrier, although the interior 
was not visible. At 0310 hours, an item resembling a [CLASSIFIED] 
emerged from the hole and was carried away by an inhabitant. The 
item was placed in one of the classrooms (which had not previously 
been observed to open). This process continued for upwards of 
eight hours, with a new item being produced once every three 
minutes. Most were seen entering a different room or locker, 
although insufficient personnel were available to track all items. 


Further investigation revealed that most, if not all of the items 
produced exhibited anomalous properties themselves. A significant 
portion of CA3-2 are involved in either guarding the items produced 
(collectively, CA3-3) or performing various tests on them. 


Update: Two days after the previous incident, three identical armed 
"guards" appeared near each entrance to CA3. Further attempts to 
enter the building were futile, as these guards have consistently 
overpowered all teams sent to enter CA3, regardless of injury or 
relative level of armament. 


Note: Reports gathered during the two days prior to guards 
manifesting outside of CA3 appear to confirm that CA3-2 is following 
standard UIU protocol regarding the items produced by the 
auditorium. Their knowledge of UIU standard procedure is 
consistent with that of Team CA3-O5. 


Update: During the UIU’s tracking of CA6, two men identical to 
Agent Dixon (a member of CA3-O6) emerged from a parked car and 
forcibly detained CA6, dragging him into the car and driving away. 
Tracking the vehicle for the next eight hours revealed that it was 
driving directly to CA3. Upon arrival, the vehicle drove directly 
through the front doors, which the "guards" had opened shortly 


before their arrival. CA6 has not been recovered. 


UIU File 0042: Message received from CA3 


On May 15, 1965, the following message was transmitted in Morse 
code from CA3 on standard UIU communication frequencies. 
Sensitive data has been classified and the beginning of each 
"sentence" has been capitalized, but the message has not otherwise 
been changed. 


Hello! We are the O5 council and we (secure, contain, 
protect) we have been shown to do and it would be nice 
to be friends. It is nice to have been a part of your 
excellent but it is best that with superior resources given 
(the greatness) we will control containment. Our 
sincerest apologies, regarding guards and detainment, 
workers and secrets kept needed: the time and waits we 
apologize, the radio blocked by one scp or two. Expect 
an expansion soon, for we spaces for although away 
from auditorium (okay but unwant). 


Eight hours later, the following transmission was received: 


Expanded now! See the federal building it is now a 
functional, need doctors guards d-men recruiting! 
Anomalies found and further possibly international, 
researching of course possible; international maybe days 
weeks to do. Further we O5 are aware (sorry to O6 
missed) that legible barely, but go-between auditorium 
not |! Goodbye and luck with your troubles. 


For further information, see UIU File 0 : Altered Federal Building in 
, (Confirmed Anomaly 10) 


Djoric-Dmatix Proposal: Thirty-Six 


Item #: SCP-001 

Object Class: Humanoid 

Threat Level: Green|Circumstantial-Red 
Containment Class: Euclid 


Special Containment Procedures: Instances of SCP-001 are to be 
contained within standard humanoid containment modules. Under 
no circumstances are any instances of SCP-001 to be stored at the 
same site, allowed to interact in any manner, or to be made aware of 
information regarding other members of the group. Personnel 
assigned to any single SCP-001 subject are not to be made aware 
of the other instances of SCP-001 or the connections among them. 


SCP-001 subjects are not to come into direct contact with any other 
anomalous items outside of approved testing. 


REVISED / /20 : 05 SPECIAL ORDER A-1130-X 


In light of the events resultant in SCP-001-05's death, the use of 
SCP-001 subjects in the neutralization of anomalous objects is 
hereby prohibited. All care is to be taken to keep SCP-001 subjects 
alive and unharmed. Recovery and containment of SCP-001 
subjects is to be considered highest priority. In the case of a death 
event, Ouroboros Protocol is to be initiated as soon as possible. 


Description: SCP-001 is a group of thirty-six individuals, designated 
SCP-001-01 through SCP-001-36. There is no apparent pattern in 
terms of ethnicity, gender, age, or religious affiliation amongst 
SCP-001 subjects. 


SCP-001 subjects display no anomalous properties of their own. 
However, any anomalous item, entity, or property brought into close 


proximity with an SCP-001 subject will be greatly modified from its 
original properties: most often, this will result in a lessening or total 
nullification of anomalous properties. Those properties not nullified 
will be changed so as to display consistency between objects of 
similar properties. All of these effects are instantaneous and will 
occur without any input from the subject. The area of these effects 
will expand in when multiple SCP-001 subjects are brought together, 
as well as the intensity of changes: multiple SCP-001 subjects are 
capable of nullifying anomalous effects without being aware of the 
presence of said objects. 


All subjects of SCP-001 seem to be instinctively aware of 
information regarding other SCP-001 subjects, generally the total 
number of the group and details of between one and three 
individuals. This knowledge is vague, making locating uncontained 
subjects difficult. 


The death of an SCP-001 subject will result in the manifestation of 
multiple anomalous entities and phenomena in the area. These 
manifestations will be of such a scope that traditional containment 
measures are unfeasible, and will result in significant casualties and 
collateral damage. Contained SCP-001 subjects have claimed that 
this is a result of the deceased individual's absence "letting things 
through", and that further events will be more severe as time 
progresses. In addition, contained subjects have claimed that any 
deceased individuals will be replaced by a newborn bearing the 
appropriate properties: no such individuals have yet been located. 


See Document 001-EX for a list of notable modifications to items by 
SCP-001 subjects. A full listing of all nullifications may be found in 
Document 001-N. 


Addendum-01: 


Known members of SCP-001 are as follows: 


Designati Ethnicit Sex Age Curren Notes 
Status 
SCP-001-Odewish- | Male 94 Contained Currently 
German in induced 


stasis to 


SCP-001+0damil Female 


SCP-001}0British Female 


SCP-001+04Han Male 
Chinese 


SCP-001+0Pashtun | Male 


88 


91 


97 


101 


Contained 


Contained 


Contained 


Deceased 


prevent 
death. 
Numerical 
identification 
code 
tattooed on 
left 
forearm. 
Was 
pregnant 
at time of 
containment. 
Child born 
without 
incident, 
currently 
under 
Foundation 
watch. 
Subject 
was British 
army nurse 
recorded 
as dead in 
T1943. 

First 
subject to 
disclose 
information 
regarding 
other 
subjects to 
the 
Foundation! 
Daoist 
priest of 
the 
Quanzhen 
School. 
Subject 


SCP-001+0@alian Female 


SCP-001-0Polish- Female 
Argentinian 


SCP-001+O08ussian | Male 


SCP-001+0Mboriginé| Female 


died in 
containment. 
See 

Incident 
Report 
001-05-EX 
for further 
details. 


Uncontaine@riginally 


recovered 
froma 
hostel in 
Budapest. 
Subject 
escaped 
containment 
eight days 
later during 
breach at 
Site-90. 
Current 
whereabouts 
unknown. 


Uncontaineth 


possession 
of GOI-16 
“The 
Horizon 
initiative”. 


Uncontaineth 


possession 
of 
unknown 
individual 
or group. 
No family 
members 
have been 
located. 


Uncontaineth 


Australian 


SCP-001+0 #Grican- 
American 


SCP-001-0 Nigerian 


SCP-001-0 Atabic 


Male 


Male 


Female 


28 


45 


14 


possession 
of GOI-16 
“The 
Horizon 
initiative”. 


Uncontaineth 


Contained 


Deceased 


possession 
of GOI-16 
“The 

Horizon 
initiative”. 
SCP-001-01 1's 
family was 
present 
during its 
recovery. 
SCP-001-01 1's 
eldest son 
offered 
armed 
resistance 

to 
Foundation 
personnel 
despite 
SCP-001-01 1's 
objection, 
and was 
neutralized: 
Remainder 
of family 
administered 
Class-A 
amnesiics. 
Subject 

was killed 
by 

members 

of GOI-03 
“The 


in every twenty-four, one of these, of course, during the 
night. 


SCP-521-11 


Dear Mum, Dad