A bunch of stuff for 173:
"Out of the corner of his eye he could see Dr Miller staring at him, or rather, at his feet. Unblinking. D-6518 cursed himself before tearing his gaze away from SCP-173, looking down at his leg. Or rather, what remained of it. His leg ended at the ankle where it had been swiftly snapped sideways, his bloodied foot dangling limply. The only reason he remained standing was a tiny statue, no more than a half meter tall, its tiny stumps of arms clasped around the break.
Hereby designated SCP-173-1."
"Thirdly, all known media containing footage of the anomaly degrades physically. Blood and faeces, identical to that produced within SCP-173's area of effect, destroy the circuitry or tape or what have you. This secondary anomaly should likely be mentioned in the core documentation: I apologize for that. As I explained, my attention has been elsewhere. I give you authorization to make the necessary edits.
Fourthly, regarding your idea to have an .aic entity observe SCP-173- yes, it has been attempted. Almost as soon as the Foundation became capable of generating artificial consciousness, in fact- and it does work. Regardless of composition, origin, or level of sapience, if a sentient entity capable of vision observes SCP-173, it will not move. However, the artificial intelligences are subject to the secondary effect I mentioned in my third point: blood and faecal matter appear in their housing medium and destroy them, given enough time."
- 173 is also intelligent enough to use its excrement to sabotage automated cleaning systems for its containment cell as well as take down two sets of remote drones
"Secondly, if you had been given access to the maintenance logs, you would be aware that two automatic cleaning systems have been installed, once in the late seventies, and once in the mid noughties. SCP-173's excretions blocked critical valves and electronics, with a surprising degree of efficiency. There was some discussion about whether the object could consciously direct the production of the blood and faeces that appears in it's vicinity, and whether it was sapient enough to deliberately sabotage the cleaning systems."
"Well, you've likely read the incident reports by now, Director. The first set of drones was taken out a week ago; one had its vision momentarily obscured by some of that foul blood/faeces mixture dripping from the ceiling, one had a malfunction in it's camera (again, blood and faeces in the circuitry), and the operator of the third blinked. A fraction of a second later, all three drones were out of commission. We chalked it up to bad luck, put the second string in, and requested a new set from Manufacturing. Three days later, the same thing happened. The statue, it seems, is capable of learning."
- 173 is capable of altering the chemical compound its excrement so it becomes a highly volatile, acid-like substance
"So apparently 173 can alter the bloody shitty muck it conjures out of thin ******* air to contain complex biochemical compounds capable of eating through carbon nanotube weave. It went down into the sluice, ripped through a foot of rotted concrete, dug through seven feet of soil, and came out in a minimum security portion of the facility, killing twelve people."
"My frame by frame review finds that at frame 235 938 of camera two's edited log, SCP-173 closes to within 10 cm of D-173-2267. D-173-2267's eyes remain fully closed; SCP-173's arms remain fixed in their usual "at rest" positions. At frame 235 939, less than 0.00001 seconds later, subject D-173-2267's head is turned upward such that it stares directly into subject SCP-173's "eyes," and -2267's eyes are now fully open. D-173-2267 collapses shortly thereafter. Death appears to be due to, at least in this instance, a combination of trauma caused by the rapidity of motion SCP-173 inflicts and the severing of the spinal cord due to separation between the second and third cervical vertebrae, and not physical torsion or strangulation, a conclusion supported by my autopsy findings. This also potentially explains the strange bruising and hemorrhaging present in the soft tissues of SCP-173's victims around the eyes; a transient, violent, non-specific, non-physical force ripping its victims' eyelids open."
"Agent Wagner points to a doorway. The bulkhead door has been crumpled to one side. A corpse is visible several metres ahead.
Lindow: Her head is on backwards.
Agent Wagner searches the corpse.
Wagner: Her neck has been broken."
"Sturluson: Shut the door.
Byock: Shut… yeah, shut the…
Agent Byock closes a door, obstructing line-of-sight with SCP-173. The door is struck from the other side until a crack forms in the door.
Wagner: It's going to smash through.
ATF 4 proceed to the Euclid containment wing at an accelerated pace. SCP-173 pursues the group, destroying obstructions while unobserved. On several occasions it utilises alternate routes in an attempt to outflank the group; the open doorways throughout the site enable it to traverse large distances unnoticed by the group. Agent Byock leads the group to the inhabited containment chamber.
Byock: This… this is the one.
Sturluson: You're joking.
Wagner: This is seventeen-three's chamber.
Byock: And it's got the guy in it. It's not my fault he picked this one.
Sturluson: Fine just… just get the doors open. Wagner, watch that other door over there.
Agent Byock opens the bulkhead doors; damage sustained prevents them from opening enough to allow access."