Oh jesus forget, I played this map with a friend. Scared the living stuff out of both of us at several occasions.
POSSIBLE SPOILERS:
I don't remember which way we went to get to this room, but there is a large room you can come into that looks like some sort of loading bay or something like that. When you walk in, there's a small office in front of you. I decided to go inside it. While my friend stayed outside the room, I went inside to see if there was anything of importance in there. I opened the door and went in. Upon entering, I saw a large table in the middle of the room, and I think there were some shelves, too. I looked around the table and through the room and found nothing of interest. Just as I was about to leave, the door slammed shut of its own accord with a loud bang. The table shook violently, smacking me against a wall and damaging me a bit. My friend let out a short scream over the mic as this happened, because apparently, just after the door closed, that creepy-as-stuff black hovering smoky figure with glowing red eyes appeared in front of him, just outside the room.
Scary stuff man.
Also, just a note to anyone who ends up playing this: TAKE THE GHOST DETECTOR WITH YOU. It really helped minimize the integrity of the heart attacks my friend and I had.