Per 
SCP-XXXX
Item #: SCP-XXXX
Object Class: Safe
Special Containment Procedures: SCP-XXXX is to remain in Vault-12, and should not be entered without approval from the current site director.
Description: SCP-XXXX is a wooden door. Upon stepping through SCP-XXXX, an individual becomes superposed between an unknown amount of realities. Said individual will remain in this state until someone checks which reality they are in, destroying the other realities in the process.
A better explanation of this anomalous effect can be seen in the "Schrodinger Cat" thought experiment. If a cat is in a box, an outside observer would be unable to know if said cat was dead or alive without opening the box. As such, until the box is opened the cat is both dead and alive. This special state of being collapses upon opening the box, wherein the cat is either dead or alive.
Similar to how the cat can be both dead and alive, subjects who enter SCP-XXXX exist in multiple realities at once. Furthermore, like said cat, a subject inside of SCP-XXXX will only exist in one of those realities when someone checks their location. This can occur by communicating with said individual, or by reading transcripts of past conversations.
Addendum 1:
The following is an experiment log recorded by Junior Researcher Grey. It should be noted that this experiment was originally supposed to be performed by Dr. ███████, while Ms. Grey observed and helped when necessary. However, due to a last minute familial issue, Dr. ███████ was unable to perform this experiment, and authorized Ms. Grey to perform it in his place.
Note from Dr. Grey:
I am so excited! My first SCP! I cant wait!
Date: September 8, 20██
Time: 2:00 PM
Procedure:
D-3903 was given a portable communication device, and was instructed to enter SCP-XXXX. Below is a recorded transcript of said device.
D-3903: There is a mountain. I can't tell how high up it is… Behind me is nothing… Nothing but the sky. It doesn't matter though.
D-3903 starts laughing
D-3903: I mean, I'm gonna die no matter what… I may as well just save yourself some trouble.
Dr. Grey: D-39, Derick, please don't do anything drastic. I-
D-3903: Tell your boss that I'll see him in hell.
A crashing sound can be heard as D-3903 presumably throws the communication device away from himself
Ms. Grey was reprimanded for addressing herself as "Dr. Grey" instead of "Ms. Grey", as well as for giving D-Class personnel non-pertinent information. She was also reprimanded for addressing D-Class personnel by their name instead of their identification number.
Note from Dr. ███████:
Despite this, I still believe that Ms. Grey performed this experiment to an acceptable degree. It is important to remember that she was supposed to use this as an 'on hands' approach to learning and practicing these rules. Unfortunately, due to [DATA REDACTED] I couldn't be there to help achieve this goal. What is more is that Ms. Grey and I had been studying SCP-XXXX for a week. Due to this, I firmly believe that Ms. Grey should be excused from these violations.
