This is security. You are on a catwalk that runs through the room about six feet off of the floor. The ceiling is medium height. The room is approximately 30 feet square. After paying admission, you follow the catwalk into another section of the pipe.
Restrooms are available on either side.
When you emerge from the pipe again, you are in a larger room. It is about 45 feet square. Again, you are six feet off of the ground, and in this room there is also a floor above you. This is the Light Lounge. It contains a small cyber cafe, arcade, snack bar, and other such semi-interesting stuff.