The ventilation shaft makes some twists and turns as it goes down.  It eventually levels out and ends with another grate.  It opens to a hallway.  The walls and ceiling are metal and the floor is covered in white tile.  Circular lights sunken into the ceiling and a slight buzz can be heard from them.  The hall looks like a regular factory or laboratory hallway except for where the walls, ceiling, and floor meet.  Running along the tops and bottoms of the walls are what appear to be pipes.  They are made of a clear green substance that looks plastic or rubber.  Inside of them is a clear green liquid which flows at a slow pace.  The smell of chemicals is throughout the building.  It isn’t strong, just a faint persistent smell, like chemicals had been used in it for some time.  There are some rooms along the hallway, the strange piping following up the doorway and entering each room.