Description: SCP-521 is a red postbox, of a design commonly used 
in the United Kingdom by Royal Mail. Retrieved from ‘ 
England, test results show SCP-521 does not differ in composition 
from a standard post box of the same design. SCP-521-X refers to 
the items received during activation of SCP-521, see below for more 
information. 


SCP-521-X are to be denoted numerically and stored per 
procedures above when retrieved. 


When a letter (‘letter' here defined as a piece of paper contained 
within a suitable, addressed envelope) is inserted through the letter 
slot of SCP-521, the anomalous effects of the object will activate. No 
other items inserted into SCP-521 will cause activation of the object. 
All letters must be addressed from one (1) subject to another 
directly. Letters sent from a singular subject to a company or 
representative of a company do not cause SCP-521 activation, or 
vice-versa. 


Memo from the Office of The Administrator 


Humanity has existed in its current state for hundreds of 
millennia, yet only the last few have held any meaning 
for us. What did we do for the countless years before 
recorded history? We huddled in caves, warding off the 
night with small fires, fearful of the things that we could 
not understand. It was not just that we did not 
understand why the sun rose every morning, it was the 
mystery of enormous fish with the heads of men, and 
rocks that came to life, and monsters that drove those 
who saw them mad. So we called them 'angels' and 
‘devils’, begged them to spare us from their wrath, and 
prayed for salvation. 


As time passed, their numbers died out and mankind 
flourished. The world began to make more sense. Yet, 
the unexplained can never truly go away, as if the 
universe requires for there to be things we can never 
truly understand. 


We will not go back into the dark, fearful night. We will 
not be ruled by the unknown. We will stand up for 
ourselves. 


Even as the rest of humanity remains uninformed, we will 
fight the darkness, containing it and shielding it from the 
eyes of the common man, so that they can continue to 
live in the blissful illusion of a normal world. 


Excerpt from SCP-001-03, page 22: 


Their faces haunt me in my dreams. Hundreds, 
thousands of them. Ones who blindly went to their 
deaths. For me. 


Excerpt from SCP-001-03, page 28: 


Made a mistake. Told someone the truth, the night 
before | left. Had to use the last of my original medical 
supplies. In a way, | wish he'd aimed for the head. 


Excerpt from SCP-001-03, page 41: 


This one solved an equation that could set a framework 
for the rest of the solution. | killed them by my own hand. 
Could they have ever imagined that it was an act of 
mercy? 


Excerpt from SCP-001-03, page 64: 


| suddenly remembered today what they told me before | 
left. They said that | probably wouldn't see anything, that 
| would probably simply fall asleep and wake up again. 
They lied. | can see them as they are consumed by 
madness, as the walls of reality crack and shatter, only 
to be replaced as if nothing happened. | can see 
everything. 


Final Excerpt from SCP-001-03, page 68: 


It is finally done. The equations are complete, the math is 
sound, but it comes too late once again. This team will 
not have the time to construct the Solution, and | will 
have to abandon the Foundation again. But, | do so with 
the knowledge that no more will have to suffer the same 
fate. 


SCP-001-34 is a worn, handwritten page discovered between the 
front cover and first page of SCP-001-03. 


To whom it may concern: 


First, | want to say that | am sorry for everything. | have 
most likely doomed you and everyone you have ever 
known to death and destruction by my mere presence in 
your world. If you are in possession of — and reading — 
this document then | am probably dead. If that is the 
case and | did not bother to destroy this evidence, then 
that means | have also probably failed in my mission. 
This means that my responsibilities have now passed 
onto you and that your fate and the fate of your world are 
now in your hands. 


| was not born into your world. | am a traveler from a 
parallel plane of existence, an alternate reality separate 
from your universe. The year from which | originate is of 
little consequence; if I've learned anything from my 
travels, the passing of time from universe to universe is 
meaningless. What is important is that in my plane of 
origin, mankind was highly advanced. We harnessed the 
power of entire stars, molded planets and moons alike to 
suit our needs, and even learned to manipulate the fabric 
of reality itself. We had conquered death through 
advances in medicine and technology, and we thought 
ourselves masters of our own fates. 


We realized too late that all such things have a cost, and 
that our greed and hubris would not only result in the 
loss of everything we held dear, but doom countless 
others as well. Our meddling in the structure of existence 
had opened up cracks and twists in the fabric of reality, a 
Corruption of the multiverse that we had failed to notice 
earlier because we could not see the pieces of our reality 
leaking into others. By the time feedback began to 
manifest, it was already too late to stop it. 


Before this Corruption consumed us completely, we 
came up with one final fail-safe. We would gather up 
what knowledge we could save and sacrifice our world to 
send a single individual through to the next. This could 
not repair the damage that had already been done, but 
could buy us the time to start over, to find a way to stop 
the Corruption of reality. That individual was me. 


If you have not already found them, then the evidence to 
support my claims will begin to bleed into your world 
soon enough. Like a rain of glass, the shattered remains 
of other universes will begin to fall and slip into yours. 
Things that defy your understanding, fixed loops and 
structures without meaning or rhyme, that cannot be 
destroyed by any means you possess. Things that drive 
men mad and challenge all the assumptions that you 
hold dear. 


That which | carry with me is the final legacy of countless 
worlds. The equations and technology described in its 
pages carry with them the hope of stopping the 
Corruption, a hope that has come with a heavy price. 
They are the last will and testament of a bloody trail of 
universes that have sacrificed and been sacrificed that 
those who remain may avoid their fate. At the time of this 
writing they are nearly complete, but time is ever against 
me. If |am no longer able to see this mission through to 
its bitter end, then it falls to you to finish what | began. 


Good luck, 
[DATA EXPUNGED] 
The Administrator 


SCP-001-35 is a single handwritten page found between the last 
page and back cover of SCP-001-03. The handwriting in 
SCP-001-35 is inconsistent with that of the other handwritten 
documents in SCP-001. 


[DATA EXPUNGED], 


This is it, the last evidence that our civilization will have 
ever existed. No one is entirely sure what will happen 
when you activate the fail-safe. Some of them are saying 
that the backlash from using it will instantly shatter what 
remains of our existence. Others are saying that using 
something of this power will merely accelerate the 
Corruption by a hundredfold. Either way, it will be quick. 
By the time you wake up at your destination, there will be 
nothing left of our home. 


You already know that it will only carry a single 
passenger, and the second team should have your gear 
ready by the time you're ready to go. | can only hope that 
with the time we've bought you, you can find a way to 
stop this disaster. If not, the device will keep track of the 
relative corruption level of local reality as well as how 
many times it's been activated. A bit sadistic of us, 
perhaps? 


By the time you read this, | will already be dead. I'm 
sorry, but you have always been the stronger one. | don't 
have the strength to face the end with my head held 
high. Not without you. 


| love you. 


Addendum 001-03: SCP-001-36 

References found within the documents comprising SCP-001 
suggest the existence of SCP-001-36, an electronic device or large 
document containing comprehensive technological and 
mathematical data related to SCP-001. The current whereabouts of 
SCP-001-36 are unknown. 


S Andrew Swann's Proposal: The Database 


Item #: SCP-001 
Object Class: Keter 


Special Containment Procedures: There is no means to contain 
SCP-001 yet found that does not risk a potential ZK Reality Failure 
event and subsequent destruction of the observable universe. (See: 
Containment Protocol ZK-001-Alpha) Current procedures are limited 
to the absolute containment of information regarding SCP-001. No 
data regarding the nature or description of SCP-001 shall be 
provided to any personnel with the sole exception of the senior 
member of O5 Command. (Currently O5- ) All data collected in 
regard to SCP-001 shall be stored in encrypted form via 
[REDACTED], with the decryption key split into thirds. Each member 
of O5 Command shall memorize one third, and only one third, of the 
decryption key. Data shall only be decrypted on a network-isolated 
eyes-only terminal to be read only by the senior member of O5 
Command, and then only after unanimous consent of O05 Command. 


Leaking of data about SCP-001, through espionage, telepathic 
leakage, original research or [REDACTED] must be contained by 
any and all means available to the Foundation. The senior member 
of O5 Command, as the one person with authorized knowledge 
about SCP-001, is the final arbiter on containment. 


Foundation personnel of Level two or higher who discover data 
about SCP-001 in the course of their normal duties may be given a 
Class A Amnestic after debriefing rather than being terminated. This 
is subject to O5 approval on a case-by-case basis. 


Description: [DATA EXPUNGED] 
Addendum: Containment Log 001-Alpha 


Date: 01/12/19 


Incident: Documents appear on Internet site 
[REDACTED] servers seized and authors traced to 
[REDACTED]. Resulting explosion explained as gas 
leak. Monitoring has not shown any further propagation 
of documents. 


Date: 03/31/19 


Incident: Script with possibly compromising information 
optioned for production by . Pictures. Original 
scriptwriter [REDACTED] agents successfully replace 
script with one re-written without [REDACTED]. Film is 
produced with title and grosses $27 million its 
opening weekend. 


Date: 06/19/19 


Incident: Novel outline describing [REDACTED] 
submitted to [REDACTED] by best-selling author 
Attempt to neutralize author unsuccessful, leading to 
high profile hospitalization. O5 authorizes the use of 
Class A Amnestic to prevent more attention to case. 
Outline recovered and destroyed. 


D te: 05/2 /20 z 

IncldeN : FounDAtlon R searcHe %20discov 
%5BDAtttA ExPu geD%5D 
Ask yourself if you want to know. 


If the answer is no, then you need to stop 
reading now. If you go and report this 
unauthorized file to your superiors, act contrite, 
and claim that you only read to this paragraph, 
you might get away with a Class A Amnestic. If 
you're lucky. And if the O5s aren’t particularly 
paranoid at the moment. 


So you want to know what SCP-001 is? The 
first answer is that it is was a placeholder, a 


theoretical designation for the prime cause, the 
ultimate reason for all the paranormal crap we 
deal with on a daily basis. SCP-001 is why we 
have to deal with omnicidal reptiles, ever 
expanding rooms, extra-dimensional pools of 
red goop and consumer products that don’t 
obey the normal laws of physics. Of course, 
given that all these things— as dangerous and 
deadly and just plain insane as they all are— 
are inherently patternless and self- 
contradictory, most researchers are convinced 
that there is no possible unifying principle for 
them all, much less a common source. 


They’re wrong. 


There’s more than one reason that cross- 
testing is discouraged, and the O5s even look 
down on excessive cross-referencing of SCPs. 
The O5s don’t want any one group looking at 
more than a handful of these things at once, 
because of what they discovered when the 
Foundation tried to develop a Grand Unified 
Theory of SCPs. That research is mostly gone 
now. Site-001-Alpha was dismantled, 
scrubbed from the archives, the staff mind- 
wiped and reassigned. No one left but me, and 
| wouldn’t know anything if it wasn’t my habit of 
not trusting the Foundation servers and having 
my own hidden personal archive the O5s 
missed in their panic. 


| was a data analyst at Site-001-Alpha [Note to 
O5 Command: Don't bother looking for me, | 
finished the job you started, the identities of all 
former staff at Site-001-Alpha have been 
completely scrubbed from the records, you 
know as much as they do now.] and | 
participated in the first and only attempt to 
consolidate all Foundation data on all SCPs. | 


was in charge of data integrity. And as much of 
a mess as you might think that was, it was an 
order of magnitude worse. 


Forget the memetic SCPs, or the ones that 
modify their own description, or the ones that 
seem to only inhabit infospace and slip into the 
database to wreak havoc. That’s all SOP for 
anyone who works with the Foundation’s 
network, just a matter of scale. Worse were 
the completely inexplicable, unexpected 
changes in data 


Sorry, that’s wrong, even though | can’t help 
thinking of it that way. It isn’t a change in data 
when reality is shifting to match. | don’t know a 
lot about the internals of the software we used, 
but | know that part of it ran outside what we 
think of as the “real world.” And, at first, 
everyone thought that the audit trails it 
produced were some sort of bug. However, it 
became apparent that the nature of the 
software, its purposeful isolation from the 
narrative-affecting SCPs, allowed it to record 
something far more important. 


It’s not visible to you, or the Od5s, or even to 
most of the SCPs we deal with, but the 
Foundation— and by extension the entire 
universe— is in a state of constant shifting 
reality flux. SCP files appeared and 
disappeared from our database with alarming 
regularity, and the SCPs referred to, to all 
appearance, appeared and disappeared along 
with them. Not just SCPs, but personnel, 
whole sites, and entire decades of the 
Foundation’s history would be re-written, 
seemingly at random. And our own memories, 
and all external research would confirm that 
“objective” reality matched the current version 


in our database. 


One of the researchers told me that it was as if 
we were seeing the effect of something like 
SCP-140, only much larger in scale. 


Yeah. Something a lot like SCP-140, and 
infinitely larger in scale. 


| don’t know who did the analysis, and if | did, | 
wouldn't say. She’s probably a lot happier not 
knowing about her own discovery. But she 
looked at what vanished and what appeared, 
and what subtly changed in the records, and 
she found the pattern, the drift toward 
darkness, toward narrative coherence, toward 
a plot... 


Everyone who works any length of time at the 
Foundation knows the universe we live in is a 
seriously fucked up place. Those of us who 
still believe in God tend toward serious 
ambivalence about his handiwork. 


But we found out that there is a God, and it is 
SCP-001. 


And it’s a bunch of horror writers. 


Addendum: Emergency Containment Protocol ZK-001-Alpha O5 
Eyes Only 


Enter Decryption Key 


Note: Containment Protocol ZK-001-Alpha carries a non- 
zero risk of creating a ZK Reality Failure event. Use 
should only be authorized in an attempt to mitigate an 
end-of-the-world scenario or the imminent destruction of 
the Foundation. 


Research at Site-001-Gamma has conducted narrative 
analysis on SCP-001's changes to the observable