It’s apparently a safe room with only an incomprehensible symbol on the floor and a lot of purple lights lighting up the room and its walls. You are suspicious but it seems nothing happens...
After a while…as there is another room like this somewhere in the complex, you feel yourself disappearing little by little. This is one of the two Twin Rooms, and whenever someone enters in this room, they will be teleported to the other one! (Go to Room -C-)