Drone moves towards a side hallway and is 
instructed to explore down it. It is noted that a 
number of messages are written on the walls, 
including "don't look at the walls" and "kill the quiet 
ones". After inspecting a number of rooms and 
finding them to only be empty offices, the drone 
returns to the main hallway. 


Drone ceases movement upon seeing a large, 
vaguely humanoid entity standing near the end of 
the hallway (See exploration file drone139.jpg). 
This entity appears to glide slowly down the 
hallways, seemingly not noticing the drone. After it 
passes, the drone is instructed to follow the entity. 


Entity enters a maintenance closet near the end of 
the initial hallway. Drone observes as entity 
extends a long arm from beneath its outer layer 
and touches the floor. Upon further observation, 
the entity is noted to have picked up some of the 
thick, dark material previously identified as blood 
and power station runoff with what is identified as 
its primary "finger" appendage. Entity then begins 
to make slow movements towards the wall behind 
it. This is obscured from the drone’s view. 


The entity ceases movement, and then slowly 
turns to leave the room. The drone is instructed to 
move towards the wall and take note of any 
changes. It is noted that the entity left behind a 
number of unique symbols, such as 
[COGNITOHAZARD EXPUNGED]. The drone 
takes several flash photographs of these symbols 
and transmits them back to site command. 


Drone is then instructed to continue to follow the 
large entity; however, the entity has disappeared 
from the hallway. It is noted that the entity left no 
apparent footprints, even in the thick material 


covering parts of the floors. Drone is instructed to 
continue on regardless. 


Drone reaches what appears to be a series of 
several containment cells. The first cell is open. A 
placard on the side of the doorway reads “Entity 
324, Scheduled for Termination 12/13/1975". The 
drone enters the doorway and observes a spacious 
containment cell. Thick rubber padding is all along 
the walls. The drone notices a human form in the 
corner of the room, covered in the thick, dark 
sludge. As the drone approaches the form, small 
sparks fire from its fingertips towards the drone. 
The drone takes several photographs, then leaves. 


The next three cells are all empty with no placards. 
The fourth cell is closed, and its placard is 
smashed. Drone is instructed to attempt to open 
the door with its cutting torch. After a few 
moments, it is able to do so. The drone enters the 
room. 


In the corner of the room is the emaciated body of 
a human female, roughly aged at 34 years. The 
body shows no signs of life. A chain is seen around 
the neck, descending into the shirt. Notable is the 
lack of sludge within this cell, possible as a result 
of the inhabitant closing the door and locking it 
from the interior. The drone searches the corpse 
for an identification badge, and finds one. The 
name reads "Jack Bright". Drone is then instructed 
to search the neck chain, but the chain is 
discovered to be broken. The drone then leaves 
the room. 


The drone traverses a short way until it finds a 
stairwell. The drone descends to the next floor. A 
sign by the doorway reads "5th Floor". The drone 
turns to view the stairwell it had previously 
descended from, but finds it nonexistent. After 
some short discussion at site command, the drone 


is instructed to enter the doorway. 


The drone enters into a large, spacious office floor, 
lit by sunlight. Several terminals are nearby, 

though all of them have been destroyed. The drone 
approaches the least damaged terminal and 
attempts to power it on. The terminal does not 
power on, though whether this is due to a power 
outage or damage to the machine is unknown. 


The drone maneuvers across the room. Papers 
litter the floor, and many look to have been burned 
or shredded. The drone reaches a terminal labeled 
"M. Hadley" which appears mostly undamaged and 
attempts to power it on. The terminal powers on, 
and the drone then attempts to connect with the 
computer. The computer is running the same 
Foundation base system as the current model, 
albeit a number of generations older. The drone is 
instructed to transmit every file it is capable of 
accessing to site command. The drone begins to 
do this. 


Note: At this point in the operation, site 
command lost contact with the drone. 
Several members of the operation team 
suddenly showed symptoms of some 
kind of anomalous influence, growing 
silent and beginning to burn from their 
ears. After the onset of symptoms, any 
sound would trigger what appeared to be 
a silent explosion that shook site 
command and destroyed most of its 
communicative equipment. 


It was later discovered that the only 
individuals influenced by this were those 
who had viewed the symbols created by 
the large entity in the basement storage 
closet. Further examination by 
Foundation cognitohazard specialists and 


screening technology ascertained that 
the symbols themselves were a sort of 
pyroclastic cognitohazard. Any individual 
becoming aware of the symbols would 
inevitably succumb to the effects of the 
hazard, making any additional 
exploration of the site hazardous. 


The drone was left unattended for 
several days thereafter, though it did 
complete its task of transmitting the 
terminal contents. The contents of this 
search can be accessed in Addendum 
1730.5. Attempts to reconnect with the 
drone were unsuccessful, and drone 
surveillance of the site from outside of 
the building showed that all of the floors 
above ground level in the primary 
structure were entirely empty. The drone 
was not located. 


+ Access fileserv:/S:/1730/exploration/log7.log 


Initial Exploration Video Log Transcript 
Date: / / 


Exploration Team: Mobile Task Force Z-9 "Mole 
Rats" 


Subject: SCP-1730 
Team Lead: Z9-Cap 


Team Members: Z9-1 / Z9-2 / Z9-3 / Z9-4 / Z9- 
Sup 


Notes: Due to high casualties sustained by 
previous exploration attempts, it was decided that 


a team experienced in exploration of anomalous 
structures would be called in to continue 
operations at SCP-1730. To that end, MTF Z-9 
"Mole Rats" was assigned to SCP-1730. The team 
consisted of five explorative members, and one 
support member who would stay at Site Command 
and monitor fluctuations in local reality. 


[BEGIN LOG] 


Z9-Cap: We're online. Let us know when you've 
got a link, Support. 


Z9-Sup: Coming up now. I'm loading your displays 
with what should be a pretty accurate map of what 
you should see in there, but— 


Z9-3: Don't bet on it, right? 


Z9-Sup: Like always. It's fully possible that there's 
a Type Green in there, alongside the other nasties. 


Z9-Cap: Alright, Command. What's the worst of it? 


SiteCommand: There is at least one 
cognitohazardous entity writing hazards on the 
walls. Your displays should be able to filter out any 
and all messages written on the walls, so we don't 
take any chances. As for the rest, it's a 
containment site. 


Z9-1: Awesome. 


Z9-Cap: There you have it, guys. Load up, let's get 
in there. 


Z9-3: Yes ma'am. 


(Z9 team enters the main structure, but search the 
upper floors first. As observed by the flying drones, 
the floors are empty. There is no sign of the 


previous exploration drone.) 


Z9-Cap: We're clean here. How are we looking, 
Support? 


Z9-Sup: Holding steady, captain. Nothing out of 
the ordinary. (Pause) Tell Four that he needs to 
adjust his channel frequency, I'm having trouble 
connecting to that module. 


Z9-Cap: Will do. Four, check your frequency, 
you're falling out. 


(Team descends to main level. After ascertaining 
the functionality of their hazard-blocking displays, 
the team moves towards a descending stairwell 
instead of the service elevator.) 


Z9-Cap: Going down now. Starting to see some of 
that sludge. Any idea where it comes from? 


SiteCommand: Part of the mixture is power 
station runoff, but it's mostly blood and some other 
biological residue, like pus. As for where it comes 
from, your guess is as good as ours. 


Z9-Cap: Guess that's what we're here to find out. 
SiteCommand: That's the one. 


Z9-2: This stuff doesn't stink like you'd think it 
would. Just smells like pennies. 


Z9-Cap: Tighten up, all. We're going into the dark. 


(Team descends several levels until they reach the 
6th basement level, marked as a Euclid 
containment wing. Z9-Cap motions to enter the 
floor.) 


Z9-1: Lot of bodies in here, Cap. 


Z9-Cap: | see em. Not all human, are they? 


Z9-2: Nope. They've all got that look to em though, 
from the briefing. Blood on their faces. 


SiteCommand: Stay alert, guys. 
Z9-Cap: Copy that. Let's keep moving. 


(Team moves forward for a short time, 
investigating the mostly empty floor. Suddenly, a 
rumbling is heard. All team members stop and wait 
for the noise to end. There is a crash, and 29-4 
shouts.) 


Z9-Cap: So what was that? 


SiteCommand: Came from below you. Notice any 
structural damage? 


Z9-3: Sure fucking did. Floor collapsed under 
Randall. He's down below us. | can see him. 


Z9-Cap: Four, you read me? 


29-4: Yeah cap. I'm alright, but my leg is pretty 
fucked. | don't know if | can get up. 


Z9-Cap: Alright, stay there. We're going to get 
down to you. Three, you stay here with Randall. 
One, Two, move with me. Let's find a stairwell 
down. 


Z9-Sup: Captain, something fluctuating below you. 
You copy? 


(Z9-Cap does not respond. Site Command also 
attempts to communicate with Z9 team, and fails to 
do so. Communications continue to be transmitted 
from the team.) 


Z9-4: Where are they? 


Z9-3: Should be on their way. 
Z9-4: Anyway you can get down here? 
Z9-3: Not without breaking my legs. 


Z9-4: You sure? | think | can hear something down 
here. 


Z9-3: (Pauses) | can't hear anything. It's probably 
just the pipes. 


Z9-4: Fucking pipes... 


(From Z9-4's perspective, the floor is shrouded in 
darkness beyond 4 meters. The only illumination is 
coming from the floor above.) 


Z9-4: No, it's definitely something, it's— (Pauses) 
fuck, Brett, it's slithering. There's something down 
here. 


Z9-3: Hang on, mate. Cap, you read me? (No 
response) Cap? One? Two? Anybody? 
Goddammit. 


Z9-4: Brett, shit, it's right here. | can hear it. (To 
something offscreen) Get the fuck away from me, 
you slimy asshole! (Gunshots) | said get the fuck 
back! 


Z9-3: Don't shoot anything, Randall, you'll— 


(29-4 cries out. Z9-3's camera observes what 
appears to be a black, leech-like creature, 
approximately the length and width of an adult 
human arm, moving slowly towards 29-4. 29-4 
continues to fire wildly, causing 29-3 to run behind 
the opening in the floor for cover. Suddenly the 
gunfire stops, and Z9-3 looks back over the edge.) 


Z9-3: Randall, Jesus fuck, I— 


(The creature has now entered Z9-4's open mouth, 
and is moving slowly down his throat. Z9-4's mic 
picks up muffled cries and a low grinding noise, 
like chewing. Z9-3 aims his weapon at the creature 
and fires, missing it when 29-4 twitches. Z9-3 fires 
again, striking 29-4 in the arm.) 


Z9-3: Oh fuck, oh fuck, oh— Captain! Permission 
to fire on Randall! 


(No response) 


Z9-3: Goddammit, captain! Permission to fire on 
Four? 


(No response) 
Z9-3: Fuck, fuck, Randall, I'm— 
Z9-4: (Choking) Please. 


(Z9-3 raises weapon and fires at Z9-4. There is 
another rumble, and the ground beneath 29-3 
gives way. Z9-3 falls onto the concrete below and 
is crushed by additional falling debris. Z9-3's 
camera and microphone disconnect.) 


(Z9-4's microphone continues to pick up 29-4 
choking and vomiting for an additional five minutes, 
after which Z9-4 grows silent. Another leech 
creature emerges from his mouth and disappears. 
29-4 stands and picks up Z9-3's weapon. Z29-4's 
camera disconnects.) 


Note: At this point, Z9 team was in full 
disconnect. Two members were 
assumed KIA, while the other three were 
not accounted for. After three hours of 
non-communication, Site Command 
contacted Overwatch Command to 
request a full stop to all explorative 


efforts into SCP-1730. While waiting for a 
response, Z9-1's microphone came back 
online. 


Z9-1: You didn't look, did you? 
Z9-1: Yeah, me neither. Cap? 


Z9-1: It was over there, against that wall. Is it not 
there anymore? 


Z9-1: | can get it open. 
Z9-1: We need fucking bullets. 


29-1: | think they're gone, yeah, but | don't want to 
wait around, for— 


Z9-1: Lower? 
Z9-1: What floor are we on right now, anyway? 


Z9-1: | thought there were only supposed to be 
fifteen. Fuck. 


29-1: Alright. 


(Z9-4's camera suddenly comes online, showing a 
massive room, dimly lit by many small flames. 
Further observation of the footage shows that the 
small flames all originate from the ears of many 
humanoids, standing quietly around the walls. In 
the center pit is a large creature that appears to be 
covered in many smaller creatures. It is barely 
distinguishable in the low lighting. Several large 
pipes over the creature have been cut and are 
draining onto the center of the room. The camera 
cuts out.) 


Z9-1: "What happened to Site-13." This is like the 
fifth time. 


Z9-1: | don't fucking know, how am— 

Z9-1: Right. 

Z9-1: Wait. 

Z9-1: Yeah, | do too. It's coming from over there. 
Z9-1: This shit is everywhere, fuck, look. 

Z9-1: Open that door, a— shhhhhh. 

(Z9-1 is silent.) 

Z9-1: No, I— 


Z9-1: Shhhhhhh stay quiet. We need to get back 
upstairs. 


Z9-1: Hey, who's that? 
(Z9-1's mic disconnects.) 


Note: With the entire team once again 
unresponsive, Site Command ordered an 
emergency termination of all explorative 
efforts into SCP-1730 while waiting for 
confirmation from the O5 council. Four 
hours pass with no response, before Z9- 
Cap's camera begins transmitting. 
Microphone comes online shortly after. 


Z9-Cap is standing in a very tall room, looking at 
some kind of large and intricate machine. She 
approaches the machine slowly before settling 
over some kind of input console with a backlit 
screen. Z9-Cap wipes dust off of a label just above 
the screen. The word "Thresher" is clearly visible. 


Z9-Cap's hands hover over the keyboard at the 
console. Another distant sound can be heard over 
the microphone, later identified as footsteps. Z9- 


Cap turns quickly to face the darkness behind her. 
As she turns, her shoulder mounted light strikes 
something on the machine behind her, and goes 
out. 


The footsteps grows closer. Z9-Cap begins to 
breathe heavily, and starts running through the 
dark. She trips and falls, and the noises begin to 
close in. 


Z9-Cap: No, fuck you, get— 


(Z9-Cap's camera disconnects. No additional 
transmissions are received from the 29 team.) 


Addendum 1730.4: Recovered Data from Power Station Terminal 


+ Access fileserv:/S:/1730/files/thresher.log 


Image recovered from power station terminal. 
[click image to enlarge] 
Dr. Hadley, 


As you can see, the power output to the Thresher 
device has been adjusted to your specifications. At 
your command, the reactors will surge to the full 
55GW required to activate the device. 


Like | mentioned in our previous correspondence, 
the reactors will likely not survive this kind of power 
surge. The core dedicated to the body pit might, 
given its reinforced construction, but there will 
likely be significant damage to all the rest. 


Additionally, and you'll forgive me for speaking out 
of place since I'm not assigned to the Thresher 
device, but the device is still wildly unstable. The