No staff outside of Project Looking Glass, or level 4 staff members are permitted access to SCP-xxxx. Staff entering the hangar, or SCP-xxxx itself must wear class 4 protective suits and carry a type 3 sensory package with them at all times.
Commas after "members" and "itself".
I'm just a bit on the fence about the archived containment procedures. They aren't super different from the initial procedures listed here save for the increase in staff necessary for containment. It's probably fine, honestly, but just something that stuck out to me.
SCP-xxxx has sustained significant structural damage, apparently from a non-optimal shutdown of its Lorentzian wormhole drive. […]
The paragraph here reads like an itemized list, so it might be to your benefit to make a bulleted list here. Just something to consider.
In places the interior bulkheads are composed of a hybrid material containing both aluminium–scandium alloy (used in 80% of the construction of the vessel) and human DNA.
Comma after "places".
The source of the information leak within Project Looking Glass that allowed an outside agency to construct a duplicate of IDV-████ is unknown. […]
This is quite a big chunk of strikethrough. At this moment, some of this information does seem to hold up regarding the object's history. If anything should be strikethrough, it should be the last sentence, as the sentence in the very next paragraph contradicts it.
During SCP-xxxx-1 voices can be detected within SCP-xxxx.
Comma after "SCP-XXXX-1". General rule of thumb is, if it can fit on the end of the sentence as well, put a comma after it.
Chief Engineer ████████ is currently stationed at Dimensional Research Area-16 and is forbidden to enter SCP-xxxx.
This statement can be messed with a bit. The first half you can link into the previous sentence, the second half you don't need, since we can assume that the engineer doesn't have the clearance anyway. Furthermore, it really bugs me when we there is certain staff forbidden from doing a thing and we don't have a name for them. This could be any chief engineer for all I know. Which one is okay to bring into the hangar if maintenance needs done?
Vocalisations are mostly unintelligible, and indicate a significant loss of higher brain functions.
Probably would be nice to have closer to the top of this particular section, since it's description of the anomaly.
Recorded incidents of SCP-xxxx-3 began 3 days after the SCP-xxxx was moved to Site-98. Occurrences of SCP-xxxx-3 initially increased in frequency and duration, until until completely ceasing on 07/20/2019.
Inversely, this would probably be more in place to have at the bottom of this particular section.
The radiation levels then begin to fluctuate in a regular, repeated patterns over the following 10 minutes. After close analysis this patterns have been confirmed as messages in Morse Code.
"patterns" to "pattern"
All occurrences of SCP-xxxx-5 should be recorded and reported immediately.
This is a containment procedure, and thusly belongs there.
So, five collapsibles is a lot to set up for addenda. I feel as if there might be a better way to get into this information without dividing it up in this way, because up to this point, the pacing has been just a bit dull. It jumps a little bit with some intrigue here and there, but it isn't really building up a whole lot. Rather, it's a bit of an info dump. It's basically a list of "This is what this is and this is what it does".
SCP-xxxx-1b: "Please don't fight."
SCP-xxxx-1b:" Great, now you've made her cry."
Seems you've confused your designations here.
"This has moved again. I swear the panel was closed last time were were here."
one of those "were" needs to be "we". Also, you don't really need quotations in logs like this, since the prefaced Bolded titled gets across that someone is speaking.
SCP-xxxx-1c: "Oh god, it's happening again!"
SCP-xxxx-1a: "Sarah, it'll be alright! Calm down!"
SCP-xxxx-1c: "No, not again! Not again!"
I thought 1b was Sarah? Honestly, if the entities have names, would it not be easier to just refer to them by their names? It'd probably be less confusing.