Per 
Item #: SCP-xxx
Object Class: Euclid
Special Containment Procedures: SCP xxx is to be put in a door frame in a room with five empty door frames, five military personnel, two tool boxes, twenty different types of animal and human restraints all inside of a heavily secure room
Description: SCP-xxx is a six foot white door made out of wood with a red door knob. SCP-xxx is a portal to a pocket dimension within there is a seemingly endless hallway of doors, each door is different when the doors are open they lead into a different time, place or universe the doors seem to fit with the location it leads to, for example a destroyed looking door lead to an abandoned house. in the pocket dimension on the floor there is writing that is written the the mother tongue of the reader the text says "welcome to the door to all doors , if you are stuck or don't know where you are just knock on the ground three time to go to the door you what ,if you are stuck in a different world knock three time on the door you came in and it will open a portal to here " the instructions written work if you were to knock on the ground three times you will be garbed by SCP -xxxx -2 to the door you came from originally. SCP-xxx-2 is a humanoid figure that looks like is made out of a black gas SCP-xxx-2 do not appear if not call by knocking. on multiple instances hostile entities appeared in SCP-xxx they and any other living creatures found within SCP-xxx have been classified as SCP-xxxx -3 these creatures are the reason that SCP xxx has being classified as Euclid for we do not know if they come from within SCP-xxx or they have a similar door,SCP-xxx-3 have come to our world through SCP-xxx , in a case of an SCP-xxx-3 it shall be detinned and SCP-xxx shall be moved to a different door frame. if the detinned -3s are sentient they are to be questioned and put in to their own cell. if the -3s are not sentient they are to be experimented on . SCP-xxx can be moved to different door frames, by moving the door it changes its place in the pocket dimension. if SCP-xxx is not put in a door frame within ten minutes it will snap into three to five pieces then in a time of five to ten hours the nearest door will transform into SCP-xxx