SCP-378: A new host once a week. The inside of human 
skulls gets uncomfortable when they're broken in. | like to 
change surroundings. As you no doubt recall, I'll need 
your assistance for that. Also, | ask to participate in the 
act of “sex”. Of all the minds I've partaken, this seems to 
be a rather prominent activity for you. Memories are but 


15-second radio silence. 


Agent Jones: Done. Route ahead looks to be 
more of the same. Water is cloudy; headlamp 
beams are penetrating no more than fifteen 
meters out. Route is rectangular, like a 
hallway, and significantly smaller in width than 
the entry point. 


DSRV Base: How wide is this area? 


Agent Jones: No more than 10 meters. Team, 
keep to the right-side wall. 


40-second radio silence as team proceeds 
further into the structure. 


DSRV Base: Please confirm status. 


Agent Jones: Slow-moving in here because 
of the water. We're sticking to the right-side 
wall. Later analysts, I'm holding up one finger 
in front of the head-mounted video camera 
right now; reference this to align editing times. 


DSRV Base: Appreciated, Agent. Can you 
describe the physical environment further? 


Agent Jones: Lockwood says she found 
some writing. Stand by while | proceed. 


DSRV Base: Affirmative. 


Agent Jones: Lockwood and Garcia are 
photographing the writing. It's not handwriting, 
it's printed, engraved, like a placard. It looks 
like some sort of warning sign. 


DSRV Base: Can you interpret it? 


Agent Jones: Negative. It's not in any 
language I've seen. 


DSRV Base: We'll get the linguists on it. 
Please proceed in whichever direction you 
choose. 


Agent Jones: Garcia says he's found another 
hatch. It's at the end of this hallway, and 
appears to be the only means of continuing 
forward. 


DSRV Base: Opening another hatch could 
cause significant water pressure differences, 
which could potentially induce physical 
symptoms. Make sure all team members 
recognize this before proceeding. 


Agent Jones: Understood. Garcia, Lockwood, 
I'm told we might get the bends if we open that 
and there's a pressure differentiation. Are you 
still alright with proceeding? 


7-second radio silence. 


Agent Jones: Copy, base, they're alright with 
it. If we go silent for longer than five minutes, 
pull us in. 


DSRV Base: Affirmative. Please use caution. 
We can always send D-classes in. 


Agent Jones: Acknowledged, but we might as 
well proceed. | don't think the Site's gotten 
many yet since it was just built. Lockwood, try 
to turn that hatch open. 


DSRV Base: Report on what is behind the 
hatch immediately after opening it. 


Agent Jones: Will do. Garcia, help her turn 
the wheel to the right. 


9-second radio silence. 


Agent Jones: Base, this thing isn't budging. 
DSRV Base: Turn it the other way. 


Agent Jones: Lockwood, try turning it 
clockwise. 


10-second radio silence. 


Agent Jones: Affirmative, base, that appears 
to be working. The hatch doesn't open in the 
standard direction. Garcia, Lockwood, stand 
clear of the hatch as it opens, in case of a 
difference in pressure. Don't want us getting 
sucked into something. 


DSRV Base: How wide is this hatch? 


Agent Jones: Hatch is probably two meters 
across, access wheel is half a meter. Circular. 


DSRV Base: Copy that. 


Agent Jones: Lockwood says the hatch is 
now loose. She says that it feels like it's going 
to push open if she lets go of it, indicating that 
the pressure on that side may be significantly 
higher than that on this side. 


DSRV Base: If all team members are aware of 
this, proceed. 


10-second radio silence. 


Agent Jones: Hatch is open. There's 
(distorted) some shit in this water. Dead fish 
and shit. Ugh. 


DSRV Base: Do you recognize the species? 


Agent Jones: They're too torn-up. The water's 
half-composed of blood and a green, slimy 


substance. God, I'm glad | can't smell right 
now. 


DSRV Base: Acknowledged. Proceed through 
the hatch. 


10-second radio silence. 


Agent Jones: Alright. Garcia, Lockwood, go 
through. I'm right behind you. 


DSRV Base: Keep your lights on, and 
describe any changes in surroundings. 


Agent Jones: Alright, I'm- goddamn it, these 
fish bits need to get out of my fucking face. 
Give me a minute to let the gunk settle before | 
can see out of my visor. 


DSRV Base: Thirty minutes remaining on air 
supply. 


Agent Jones: Yeah, yeah, | know. 
20-second radio silence. 


Agent Jones: Okay, here we go. Alright, this 
area's different. We've got what looks like 
some thick, transparent glass or plastic 
material. It's looking out over the sea floor, and 
there are two massive spotlights illuminating 
everything. I'm getting this on video and 
Lockwood and Garcia are photographing 
another foreign language placard they found. 
But the glass is fogged up. | can't see too well 
through it because it's deteriorated, but there's 
a really big view out there. 


DSRV Base: Photograph all that is necessary. 


10-second radio silence. 


DSRV Base: Agent, I'm told that this 
environment does not match up with 
geographical mapping of this area. If the 
direction in which you have proceeded is 
accurate, you should at this point be 
underneath the sea floor. How far above the 
sea floor do you appear to be? 


Agent Jones: At least a hundred meters. It's 
hard to tell proportion from here, but this would 
be like standing on top of a small building and 
looking at the ground. The bottom is 
transparent, too; | can look under my feet and 
see out into the surrounding water, if | move 
my foot to push the piles of fish guts out of the 
way. It's dark, but it looks like this thing has 
some artificial lamps lighting the sea floor a 
little bit. | see some fish moving way below us, 
in the sand. 


DSRV Base: Noted. Proceed further down the 
route, and try to locate the source of the 
biological matter. 


Agent Jones: Affirmative. We're proceeding. 


23-second radio silence as the team proceeds 
further away from the access point. 


Agent Jones: Something isn't right. 
DSRV Base: Describe immediately. 


Agent Jones: We're several more meters 
down, and we passed through a smaller hatch. 
There's a setup here: Some sort of elevator? 
No, it's not an elevator. It's a platform. There 
are these buttons by it — no, switches — with 
placards beside them. This is some sort of 
directory. Lockwood and Garcia are taking 
photographs as we speak. 


DSRV Base: Do not interact with the platform. 
Agent Jones: We won't. 

13-second radio silence. 

Agent Jones: Hang on. Fuck. 

DSRV Base: What's wrong? 


Agent Jones: | found what's causing the fish 
bits. There's some sort of intake vent right 
here. Something with spinning blades. On our 
side, there's a thin mesh grate, but behind it is 
the body of a whale. At least | think it's a 
whale. | can't tell because it's so torn-up. I'm 
videoing it. 


DSRV Base: And the whale's viscera is 
leaking through the grate? 


Agent Jones: Affirmative. God, this is nasty. 


DSRV Base: You are free to proceed to a 
different area provided you are done 
photographing. Try to proceed further into the 
structure. 


Agent Jones: We're not seeing much. My 
flashlight beam can reach all the walls, and 
there are no further access points or hatches 
visible. If we move forward, it's going to have 
to be with this elevator thing. Provided the 
thing even works. 


DSRV Base: That is ill-advised. There is no 
telling what a transportation device of unknown 
function will do to human physiology. If you 
decide to proceed, do not go alone, and keep 
in mind that it could have adverse effects on 
your body. 


Agent Jones: Alright, noted. We'll keep 
looking around. 


DSRV Base: Can you move the whale carcass 
and access the vent? 


Agent Jones: | guess. It's a baby whale, but | 
don't exactly want to touch it. 


DSRV Base: You're wearing full hazmat 
equipment and a scuba suit. Get one of the 
other agents to do it, then. 


Agent Jones: Fine, fine. Garcia, help me get 
in here and move this damn thing. 


34-second radio silence. 
DSRV Base: What is your status? 


Agent Jones: We're just about to... 
(interference) Fuck, there. We got the grate off 
and the whole carcass went flying into the 
room. Jesus. The room's half-blood now. Can 
our rebreathers filter out this much shit? 


DSRV Base: Yes, they can. The filters catch it, 
but try to slow your breathing a little. They're 
having to work harder to extract oxygen. 


Agent Jones: Alright, we can do that. How 
much time do we have? 


DSRV Base: Twenty-three minutes. Explore 
this upcoming area, and then retreat back to 
the vehicle for safety. 


Agent Jones: Much appreciated. 
18-second radio silence. 


DSRV Base: What is your status? 


Agent Jones: This area isn't safe. There's a 
massive rushing current flowing from our right 
to our left. If we step out into it, it's not gonna 
go well. 


DSRV Base: We are not asking you to step 
into it. Photograph the area and surroundings. 


Agent Jones: Affirmative. Distance across is 
large; probably twenty meters. We seem to 
have doubled back on ourselves, but the 
layout doesn't match up. 


DSRV Base: Can you elaborate on that? 


Agent Jones: We made a U-turn from the 
observation hallway with the glass, which 
logically means that area would be to our right 
by a few meters at this point. But it's not. This 
is just an empty tunnel with a current flowing 
through it. 


DSRV Base: Alright. This is looking like an 
extradimensional anomaly, then. Explains the 
massive size of the thing. We'll make note of it. 
Don't lose sight or connection with your 
retrieval cord. 


Agent Jones: We won't. Lockwood, brace 
yourself on the edge here and hold my hand 
while you lean out and take a picture. Can you 
do that? 


DSRV Base: Be careful leaning out into any 
moving water. The difference in force could 
lead to injuries. 


Agent Jones: She's being careful. 


DSRV Base: Alright. Please retreat 
immediately after this. 


Agent Jones: Lockwood's gonna hang onto 
these pipes and crawl about five meters down 
along the side. She says she sees another 
placard with language and information. 


DSRV Base: That is not advised. Please use 
extreme caution. 


Agent Jones: Acknowledged. She's leaning 
out now. 


15-second radio silence. 
DSRV Base: How far down is she? 


Agent Jones: She's almost- hang on, shit- 
(distorted) 


DSRV Base: Is there an emergency? Please 
respond. 


Agent Jones: Fuck, fuck. She just slipped, 
the- the fucking pipes snapped and fell off. 
Lockwood, wrap your hand around the 
retrieval cord and hang on while Garcia and | 
pull you up. 


DSRV Base: Do not hold onto anything that 
doesn't look solid. 


Agent Jones: We know, we know. (distorted) 
Fuck, fuck, she's- (unintelligible) No, no, you 
don't have to do that, just try to grab the wall, 
we can brace you- (unintelligible) Fuck, base, 
we're all slipping. Lockwood- no, don't, we can 
pull you up, just stop moving- (unintelligible) 
No, no! Oh my- fuck. Fuck. (distorted) 


DSRV Base: What is your status? 


Agent Jones: Lockwood cut the fucking cord. 
We were all falling and she just- she saw that 


we were slipping and she reached up with her 
knife and cut herself off. Christ. 


DSRV Base: Understood. Can you see her? 
8-second radio silence. 


Agent Jones: She's gone, she's so far down 
the stream that | can't even see where it ends. 
It's too dark to see past several meters 
anyway. | swear I can hear- do you know how 
far sound would travel in water like this, 
through these suits? (unintelligible) | swear | 
can hear her. Fucking hell. 


DSRV Base: It is highly unlikely that you 
would be able to hear her at this point; the 
distance would be too great. Return 
immediately to the vehicle. 


Agent Jones: (distorted) Alright. Come on, 
Garcia. 


DSRV Base: Report any abnormalities you 
notice on your way back. 


Agent Jones: Yes. 
17-second radio silence. 
Agent Jones: The- the whale's gone. 


DSRV Base: The whale is gone? Are you 
saying the carcass is out of sight? 


Agent Jones: The whale carcass is gone from 
this room it had ended up in after we cleared 
the vent. The water is clear again too. 


DSRV Base: What has changed in the 
surroundings? 


a glance. If this “sex” is really worth all that you humans 
go through for it, | think I'd like to experience this. 

Agent [sounding surprised]: Sex? Why? 

SCP-378: Would you ask the same question if | were a 
normal human? 

Agent [pauses]: No. 

SCP-378: Then let us pretend that | am, yes? 

Agent: What's to stop us from using the information you 
give us to kill you? 

SCP-378 [laughs loudly for several moments]: You truly 
are a primitive race! My brothers may share my genes, 
but not my physiology. Do you really think I'd tell you how 
to kill me? [more laughter] 

SCP-378 [now in a very serious tone]: Do we have an 
agreement? 

Agent: | suppose we do... for now. But one last question: 
why are you here? On Earth, | mean. 

SCP-378: Ahh... Why are you here, Agent? 

Agent [after a long pause]: To stop you. 

SCP-378 [smiles]: Precisely... 


SCP-378 refused to speak further on the matter. It should be noted 
that the operation to exterminate SCP-378's "brothers" was deemed 
a success in spite of nearly 85% losses of the teams involved. While 
effective, the methods suggested by SCP-378 were terribly 
inefficient. Subject seemed amused by this. Recommend further 
study of recovered corpses of "brothers" in hopes that some method 
of neutralizing SCP-378 might be found. 


« SCP-377 | SCP-378 | SCP-379 » 


20-second radio silence. 


Agent Jones: (/ow volume) |- don't want to 
talk too loudly. There's something... off. About 
the wall by the elevator device. 


DSRV Base: Why are you whispering? Is 
there an entity present? 


Agent Jones: (/ow volume) Yes. By the wall. 


DSRV Base: If you are unsafe to speak, 
remain silent and exit the structure. If you feel 
comfortable speaking, describe its physical 
appearance, and photograph it if possible. 


Agent Jones: (/ow volume) | can't- it's not 
visible. 


DSRV Base: You said it was by the wall. 


Agent Jones: (/ow volume) | know. | know it's 
there. That's where the lighting changed. It 
turned something on over there. It's messing 
with the device with all the switches. | don't 
think it's looking at me yet. 


DSRV Base: Please describe it. If you do not 
see anything, it could be possible that this is a 
paranoia response following trauma- 


Agent Jones: (/ow volume) This isn't a 
hallucination. There is something here and it 
just cleaned up the whale gunk. And now it's 
fixing the elevator. 


DSRV Base: How do you know? 


Agent Jones: (/ow volume) I'm watching it. 
(distorted) It's a clearer patch of water. It's a 
slight difference in the light. It's flipping 
switches, I'm watching them move. 


DSRV Base: Are you saying this entity is 
invisible, but affected by water and light? 


Agent Jones: (/ow volume) No, |'m saying this 
is incorporeal. | can't actually tell if it's there or 
not. It hasn't talked to me yet. (unintelligible) 
Garcia says the same thing. What do you want 
us to do? 


DSRV Base: If it hasn't noticed you yet and is 
not observable to photograph, exit the way you 
came. 


Agent Jones: Okay. Alright. | don't think it can 
hear. I'm talking at normal volume now and it 
hasn't noticed us. 


DSRV Base: Stay silent and report when you 
exit the room. This should take no longer than 
sixty seconds. 


25-second radio delay. 


Agent Jones: Fuck, fuck. No. Just- no. (low 
volume) Every time | move, | feel it noticing 
me. | think it can feel the water. The movement 
in the water. It's going to look at us and 
(distorted) stop us. 


DSRV Base: Are you saying this entity has 
hostile intentions? Do not feel compelled to 
answer if speaking is unsafe.