SCP-536 is to be maintained according to standard Foundation procedures.
This is not containment procedures, this is a cop out to avoid writing them. Things to consider include who can access this, how easy you want it to be to access, and its potential danger.
SCP-536 is a ██ by █ by ██ meter chamber, with a 50 centimeter square viewing window…
You give us the dimensions of the window and a photo of it - it wouldn't be an insurmountable task to extrapolate its dimensions from that. I'd recommend not censoring its dimensions, as I can see no reason why they would be sensitive information.
The viewing window is opaque to electrons, nuclear particles, [REDACTED], and photons of energies above 1 keV.
Except for the viewing window, SCP-536 is totally opaque to electromagnetic radiation and subatomic particles.
These properties are highly anomalous and sure to attract attention, but you simply glaze over them.
I dislike the amount of censorship and the Anti-Foundation links in the recovery log. Why not attribute this to Prometheus Labs? This is right up their alley.
Now, onto the first test. I don't think they would jump into human testing right away… Let me rephrase that. There is absolutely no conceivable circumstance under which they would find a device and have no idea what it does, or know full well what it does for that matter, and immediately throw people inside and begin their dickery with the fundamental forces. Why the hell would they not stick a rock inside? Or a clock? Or a computer running at a predetermined speed? Further, how did the sensors inside the chamber remain operational after being subjected to the same environment that turned the doctor into a black hole? Would the doctor have had enough mass to become a black hole stable for longer than some minuscule fraction of a second?
Second test. Again, unnecessary human testing.
Subsequent analysis of video indicates both Lorentz contraction and redshift of light on the baseball…
Was the baseball thrown at approaching the speed of light, then? If so, where was the observer relative to the baseball's direction of movement? Unless it was thrown away from the observer, I think blueshift is the term you want. I'm also iffy on the described effects here. I'm not sure a person would feel pain due to this. I doubt very much that slowing down the speed of cognition would have the same effects as laughing gas or intoxication, because from the frame of reference of the person that's slowed, there would be no difference. An outside observer would note they appeared to move/think/speak/whatever more slowly, but that doesn't equate to impaired mental function, I don't think.
Third test. Goes without saying. That aside, only issue is:
…approximately zero Carbon-14.
That wording feels odd.
Final test. Again, goes without saying.
1:35:11 Theta dial returned to normal value. Teams in Hazardous Environment suits open the chamber door. Hydrogen gas and high levels of neutron radiation are detected.
Oh boy, an explosion hazard. Good thing the containment procedures… clearly outlined a… ventilation system… to deal… with… No, wait, shit, BOB, DON'T LIGHT A CIG-
My downvote remains pending these issues being addressed. If I'm mistaken anywhere, please correct me.