Item #: SCP-3930
Object Class: N/A
Laconic Containment Procedures: Only O5 and on-site personnel can know about it, but no one at all is allowed to observe it. Anyone that observes it must enter it. Generally act like it doesn't exist, because after all, it doesn't exist.
Laconic Description: SCP-3930 is an area of spacetime in Russia that is nonexistent. It is not a void, as a void is something that exists, this is an area that simply isn't. Walking into it will make you cease to exist.
By looking into it you also observe Pattern Screamers, conceptual non-beings left over from the destruction of the previous universe who draw power from being observed. Normally they're trapped in between universes and are extremely hard to see but due to SCP-3930's existence they can be directly observed.
Additional Context: The Pattern Screamers are described as sentient hallucinations, but one researcher explains the apparent sentience is only a reflection of the human psyche after it has been shattered from observing SCP-3930, and that the nothingness acts as a "hateful mirror" in which hateful thoughts are reflected back to the observer as "screamers."
In the words of Reddit user rodgercattelli:
"Knowledge of non-existence is something the mind can't comprehend. So the mind tries to make something of it. But it's nothing, so the mind has to invent something and put that something there. And it is that something that we put there ourselves that is the threat that will emerge from this nothingness."
SCP-3930 was also used in an attempt to terminate SCP-682; the attempt failed, of course.