SCP Foundation

containment zone of sight 88.

"Site-88" is how this should appear.

Weekly checks for any cracks, or holes in the containment chamber of SCP-4808, is mandatory.

I find both of these commas unnecessary. Also, consider rewriting this to be imperative. Something like "Personnel are to check the containment cell for cracks or holes every seven days."

SCP-4808 shows sentience, as it is able to move on its own, but shows no other sentient qualities.

Then it's not sentient. In order for something to be sentient, we have to have evidence that it has the ability to suffer or feel physical or psychological pain.

Once the personnel dies, SCP-4808 will immediately unknot itself, and collapse onto the floor. It shall then resume its docile state of slithering to the nearest human.

I'm just going to quote the above as a general summary paragraph for the rest of your article after my other specific piece of feedback. At the end of the day, this is an item that just kind of kills people. Your SCP doesn't contain any extra hints at a story; there is no background information, no recovery information, nothing at all to emotionally latch on to as a reader.

Without at least some of those things, this article would be dead in the water. I'd suggest you head back to the brainstorming forum and see if you can engineer some ways to expand this out, and then try another draft.