He walks through the darkness for what feels like a long time, until he comes to another room. This one is dimly lit by the glow of red emergency lights overhead, and the room seems to be rather small. Of course, there is another door at the end of the hall, which slams shut as soon as he enters the room. He looks around the room before walking forwards. Surprisingly, nothing happens until he reaches the gate, which doesn't open. Hmm.... It seemed this was a test of his mental prowess....
He looks around the room for a switch or something similar, but sees nothing. Okay... This was strange. A door without a switch or lock to open it from... Or maybe the lock wasn't visible? Yep. That's possible.
Casting his senses around the room, he feels mechanisms hidden behind panels in the walls. Only problem was... Which one opened the door...?