[8.1]. Mission 1 - dataDyne Central: Decfection (3)

Once you land on the rooftop, turn right and head down the ramps to the lower level. Spot a guard patrolling the area, kill him, and grab the CMP150. Go left of the ramp's end and through the door with steel grates. Go through the next door. Turn left and slowly go down the ramp to avoid detection by the guard. Kill the guard, then continue down the ramps to the bottom. Look right for a redish control panel and use your ECM Mines on it to complete the first objective.

Head through the door with steel grates on the far wall. Go down the ramps until you reach a guard halfway down. Take him out with your Silenced Falcon, then go through the door. Go right after the wooden door and take out the guard ahead with a headshot (a shot that lands on the enemy's head, usually an instant kill). Take out the guard who comes to his rescue. Push the button on the desk near where the guard was. Go through the large doors near the glass elevator. Put away your weapons, punch Cassandra, and take the keycode necklace.

Leave Cassandra's room, go through the brownish door near the elevator, and go up the stairs. Exit the elevator, turn right, and destroy the camera. Take the elevator on the left down. Kill any guards, go down the small flight of stairs, and enter the door on the right. Place an ECM mine on the control panel and leave the room.

Head down the stairs you were just at, all the way to the bottom floor. Turn right and kill any guards. Go around the next corner and through the big double-doors, then run down the hall. Blow up the camera at the end of the hallway near the other door. Go through that door and keep going until you reach two doors to the left. Open the second door. Take out the guards who see you and call for security. Follow the fleeing guard to the elevator on the left. Activate the elevator. Equip your Data Uplink and use it on the computer near the guard once he says he's in to download the project files and complete the third objective.

Take a right at the bottom of the steps and go into a small room with a computer and desk. Press B to open a multi-colored wall, revealing a hidden door. Kill all enemies in this area. Work your way around until you reach a blue-ish elevator. Take it to complete the final objective.