Get to the first floor, at the intersection with the sign that reads "Server Room ], and Security Station 1 [". After you get the Data Stick from the room that the man appears from, go down the hallway until you get to the intersection. Turn left and go down that hall until you turn right and get to the door. Enter the door and you will be in the security station. The guard should be talking to a passing guard. Wait until he is done. As soon as he finishes, sneak up behind him and grab him. Make sure no one sees this. After this is done, drag him into the dark corner near the door and knock him out. Go through the door in the far corner and you will be in a closet. In there, there is a Med Kit, Sticky Shockers, and some other items. When you are done, go through the door you came in, then go back down the hall to the intersection again, being mindful of security patrols. If you see a security guard by himself, grab him, knock him out, and hide him in the shadows. Down the hall, there is a closet with some gadgets in it. When you are done with this hallway, go through the door with the keypad on it.