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

Access the Foyer Elevator: Start by equipping Night Vision Goggles. Proceed forward and eliminate the guard behind the desk with a headshot. Turn right, find a hidden door in the wall, open it, and kill the guard inside. Grab the ammo, then proceed right to eliminate two more guards. Navigate the main room, eliminating any guards encountered, until you reach stairs guarded by enemies. Shoot these guards, ascend the stairs, turn left, and enter the elevator to complete the first objective.

Reactivate Office Elevator: As you ascend in the elevator, remove the Night Vision Goggles. Exit the elevator, turn right, and go around the corner to eliminate a guard. Proceed through the doors behind him, following the curved hallway until you encounter two of Cassandra's bodyguards. Defeat them and take their shotguns and cartridges. Continue through the single door at the end of the hallway into a room with another of Cassandra's bodyguards; eliminate them.

Activate Office Elevator (Continued): In this room, locate the control panel on a desk. Press the 'B' button to activate it and the office elevator.

Defeat Cassandra's Body Guards: Backtrack to the first elevator (not the one you just used). This elevator will take you one floor up. Exit and turn right, then go around the corner to face more helmeted guards. Eliminate them and proceed through the door to their left. Navigate through the inner office, turn left, and go through the hidden sliding door. Open the next unlocked door to find another bodyguard; defeat them. Proceed through the subsequent door. Walk forward; you will see an elevator on your left. Ignore it for now and proceed straight to clear the room ahead of any remaining bodyguards. Return to the elevator and use the door next to it.

Ascend and Acquire Rocket Launcher: Go up the stairs to the next floor. Turn right and you will hear scientists and a guard arguing. Eliminate the guard and allow the scientists to escape. Take the Rocket Launcher.

Destroy dataDyne Hover Copter: Turn to face the large window on your left. Equip the Rocket Launcher and wait for the Hovercopter to appear outside. Fire upon it when you have a clear shot. A successful hit will complete the second objective.

Defeat Cassandra's Body Guards (Continued): Turn right and use the door near where you obtained the Rocket Launcher. Take the stairs to the top floor and proceed through the steel grate. Once outside, eliminate the remaining bodyguards to complete the third objective.

Rendezvous at Helipad: Navigate the ramps all the way back to the helipad. Upon reaching the helipad, you will complete your fourth and final objective for Mission 1.