He gets up and leaves his room, making his daily rounds, nothing looking out of place.  When he is in the center of the building he takes some deep breaths and concentrates.  He reaches out with his mind, letting him sense anything that is near.  He jumps when he actually feels something close by.  A grin spreads widely across his face.  He laughs excitedly and runs back to his room much like a hyper child.  He goes over to the console and presses a button on it.  The main door opens some, making it look like someone left it open.  He then grabs two flasks off of his desk and mixes them together before chucking them into the ventilation shaft.  It makes a small explosion, not causing any damage but making a loud bang.  It reverberates throughout the maze of shafts until a loud, low rumbling can be heard though out the building.  The sound also carries outside easily, being heard for over a mile.  He then sits back down on the floor and waits.