you are a D class personnel and two guards are taking you to a cell and few minutes you and the two guards are in front of a cell door one of the guard goes open the door so then the cell door open and the guard gesture you to go inside the containment cell so you walk towards inside the cell when you are inside the door behind you quickly close you look at the door and you look back at the room it was dark and empty but then you hear a voice

“Hello”

the echo voice sounded through the room