After the cut-scene is finished walk toward Ort-Meyer's corpse and take his car keys, then make your way through the basement until you discover the elevator. Finding the elevator is trivial. On the way, you may pick up syringes from a room with a patient inside. You will also see many 48 clones lying dead on the floor everywhere; those are the clones you killed in the last mission of Codename 47. If you have the Ort-Meyer key card, you can also obtain a minigun by using the syringe on a patient and a Gold Desert Eagle dual lying on the floor, both in places with a keycard reader outside the door. They are cool, but cannot be used outside the level (? verify this) and aren't useful for a Silent Assassin run. Warning: The minigun will seriously slow you down and running won't help.