Unfortunately, there's so much wrong with the spelling, formatting and general execution, it's actually quite hard for me to work out what the central idea even is.
You describe -A and -B as a metal cube and a housing unit within that cube, but then you say "SCP-1945 appears internally to be a visual effects studio". So, is the visual effects studio inside the cube? Inside the housing unit that's itself inside the cube? Or are both A and B inside the studio (in which case, why are they described first?)
In any case, the main point of the SCP appears to be the so-called "exclusion event", during which… the employees of the studio visit the basement and turn into monsters? I think? You refer to a "large organic structure" (with a "slide" in it?) which is presumably in the basement, but this hasn't been mentioned in the description at all. The altered monster employees then…attempt to stop the air conditioning in the basement working, even though they injure themselves heavily in the process? This apparently leads to the organic structure overheating and shutting down, I think? Or a related machine shuts down? The after this happens, the cameras in the studio go dead for two days to a week, and then when they come back up again, everyone's fine and doesn't remember what's happened.
I hope that's a fair summary, although I honestly had to work hard to get it to make even that much sense. If that is the rough concept, I have to say I don't really care for it: you've just got a fairly generic workplace that sometimes works on gory things, and then a recurring event during which the employees turn into fairly boring creatures an embark on a gory but otherwise meaningless ritual. There's no sense of a narrative behind these actions, or any kind of explanation or hints to pick up on as to the reasons for it all.
Moving away from the concept, the writing is just poor throughout. Going line by line:
Object Class: safe
Object Class should always be capitalised, so "Safe".
Special Containment Procedures: SCP-1945 is to be kept on SITE 18
Should be "Site-18". I'm still confused as to precisely what the SCP is, but if it is a whole visual effects studio, we presumably can't easily move it around, so I'm not sure how much sense it makes to say we're keeping it on a Site. Instead, a Site would be built around it.
Should be a full stop at the end of this sentence. The next sentence doesn't need to be on a new line as it presently is.
SCP–1945 –A: Large metal cube with a steal hatch located on the top plane.
No space between "1945" and "-A". You mean "steel", not "steal". "located on the top plane" is an awkward phrasing; I'd substitute "set into the top surface". Don't use a colon here, instead just write full sentences, i.e. "SCP-1945-A is a large metal cube with a steel hatch set into the top surface."
SCP–1945 –B: large housing unit encased within SCP–1945 –A
Again, this should just be a new sentence in the same paragraph as the last two, not on a line by itself. Again, don't use the colon as you have, write a full sentence instead. I am bit perplexed as to how there's a housing unit inside the cube? What does "housing unit" actually mean here?
Both instances were found buried in the Algar Do Carvão caves.
You should specify where in the world this is, at a minimum, it should be "the Algar Do Carvão caves in the island of Terceira in the Azores."
These four lines should be all one paragraph, rather than constantly on new lines.
Amnesiacs where administered.
You mean "were".
SCP-1945 appears internally to be a visual effects studio resembling that of ███████, New Zealand.
I'm a bit confused as to how a visual effects studio can "resemble" another specific one. It's either identical to it, or it's going to just be as similar to it as any other visual effects studio, surely? What specific features does it share? And why is this relevant to anything?
The residents of the studio do not change, shower or sleep in the days surrounding the event yet show no symptoms of insomnia.
For clarity, have the Foundation been inside the studio at all? Have these resident been interviewed, or any effort made to remove them? If not, why not? Do they ever leave the studio? Do they have anything approaching normal lives?
Better to have a full stop rather than a comma here, and then begin a new sentence (as part of the same paragraph though, not on a new line!). Has the Foundation made any effort to identify where these emails come from?
film projects worked on by the team range from animated features to footage from unsolved homicide cases however studio residents do not appear to be effected
Should be "affected".
by the extreme nature of the footage and focus mainly on composting and.
And… what? Finish this sentence, please.
Four cameras are located throughout the building recording in pixel resolutions
Surely you need to say how many pixels? All resolutions are pixel resolutions. Although to be hones,t I'm not sure why this level of detail about the cameras is necessary.
, at 24, 30, or 60 progressive frames per second.
Again, this detail on the cameras seems irrelevant. Are these cameras part of the original structure, or are they placed there by the Foundation for surveillance?
EXCLUSION EVENT
Generally speaking, when an SCP has an associated event, the event is not given a name like this. It's more usual to see some kind of arbitrary code name , like Event-1945-Hepburn. Right now, it's really unclear as to why it's an "exclusion event". What's being excluded?
A siren will sound in the building at which point the basement level door will open and the inhabitants will begin to descend single file.
The basement level and its contents haven't been mentioned up to this point, which feels like a major omission. "the inhabitants" is ambiguous as to whether it's the inhabitants of the studio (i.e. the employees, already mentioned) or some other as-yet-undescribed inhabitants of the basement. Specify who they are more clearly.
After exactly 58 minutes have passed
"After exactly 58 minutes have elapsed since the siren began to sound" would be more precise.
subjects will emerge in the basement devoid of clothing,
So… they took off their clothes after they descended to the basement? Haven't we observed them the entire way, so we'd have seen them do that? Or are they spontaneously vanishing and reappearing.
having undergone the primary stage of the exclusion event.
It isn't clear what this means. If it means that they've become "altered employees", as below in "Stage 1", then we need the description of what "Stage 1" is to appear before this sentence, not after it.
Consistently inhabitants faces will be covered with a wet fabric and heads apparently shaved.
Again, surely we'd have watched these things occur?
Playback of the video shows that each inhabitant has grown an estimated 65 cm taller and appears to have become malnourished in the process. Stretch marks are visible on the arms and lower torso.
This all suggests we're only watching this happen on video (and only from restricted angles at that, so we don't see everything). Why?
Stage 1: Inhabitants of SCP-1945 begin to act with the characteristics of a lentivirus.
I don't know what a lentivirus is, or what it would mean for a human to act with its characteristics. This merits a footnote and/or some additional explanation.
Altered employees will now be referred to as AE’s
It is more usual to describe subjects altered by an SCP as "SCP-XXXX-1" (or whatever suitable number is as yet unused in the article.
AE’s begin the process
What process? It can't be the "exclusion event", because that already began with the siren. This is the first mention of any kind of process.
by opening the slide in the large organic structure and cutting what appears to be a large artery.
None of these objects (the organic structure, its large artery or its "slide", whatever that means) have been mentioned up to this point. They all clearly need to be, in the description.
Two then cram and block the top fans using ███████ ████.
The fans also haven't been mentioned. The expungement here doesn't make any real sense either, especially considering you say they use "any sharp object" in the very next sentence. Although it also isn;t clear how sharp objects would "cram and block" fans.
This can take 4 - 6 minutes,
"This takes between four and six minutes."
In all cases the wounds are potentially fatal lacerations resulting in large blood loss.
Why are there wounds at all, if they're using tools to do the blocking of the fans? It's really unclear here what is actually happening, who is doing what to whom.
AE’s appear to be in extreme pain during this stage.
Again, why?
Once done the subjects will crawl into two adjacent vents in the ground. It is unknown where these vents lead.
Why don't we know? It's be straightforward enough to send an endoscopic camera down or something. Have we not been in the basement at all? Why not?
At this point the five other AE’s will enter the room also devoid of clothing.
You already said they all entered the basement devoid of clothing. Five can't enter again now.
AE’s enter at a sprint and attempt to “jam” themselves into the lower fan vents on the sides of the organism. During the process subjects endure massive self induced tissue trauma and blood loss as a result of the vent edges and small size of the entry points.
Why aren't these five using the same sharp objects the first two were using?
AE’s do not appear to be in pain from the injuries,
A full stop or a colon would be better here.
each of the five will attempt to help push each other into the vents though
You mean "through".
movements that become exceedingly euphoric in nature.
How can movements be euphoric?
This progression can take up to an hour and has been described as “difficult to watch”.
Described by whom?
Due to the extreme damage taken by the AE’s, it is unclear how they are able to manipulate the machine once inside,
What machine? This is the first time a machine was mentioned. Is it the same thing as the organism? What manipulations are being performed, besides jamming the fans?
however after 36 minutes exactly
36 minutes exactly after what?
the machines systems
Should be "the machine's systems".
begin to fail gradually and heat signature suggests it stops generating heat.
If, as I've thought up to now, we;re only seeing this on camera, how are we getting a "heat signature"?
Approximately 4 hours after the exclusion event finishes
What marks the end of the exclusion event? The failure of the machine?
the cycle resets itself and all cameras feeds go dead.
Should be "cameras' feeds".
Attempts to get the feedback online during this stage have resulted in failure.
"Feedback" isn't the right word here. "Attempts to get the camera feed online" would be better. Again, are these cameras part of the overall SCP, or Foundation installed. Why, given that they don't work all the time, do we rely on them to monitor the object?