[8.6]. Mission 6 - Pelagic II: Exploration (3)

Disable primary power source: After the cutscene (a non-interactive cinematic the game plays automatically), turn right and enter the door next to the ramp. Quickly take down the guard inside with a headshot (a shot that lands on the enemy's head, usually an instant kill). Go right, then left at the end of the hallway and immediately kill the guard before he sets off the alarm. Run to the next door and kill the guard on the other side through the glass. Go inside and eliminate any other guards. Head down the hallway towards the back, but enter the door to your left as the hallway begins. Go around the wall, kill the guard who enters, and destroy the security camera behind the wall. Shoot any guards below you under the grates. Equip your X Ray Scanner (a tool that allows you to see through walls) and locate the power generator in the middle of the room. Turn off all green switches to shut down power. Head down the stairs, being careful of the camera behind them; shoot it out. Turn to the large power generator near the stairs and press the green button to shut down the main power source.

Secure laboratories and research data: Leave the room, go left and down the hall. Turn left at the first set of stairs and enter the very first door on your left. Destroy the security camera on the right. Go down the hall and enter the very first door on your left. Put away your weapons before entering. Punch the scientists unconscious before they escape and grab the disks they drop. Go into the door across from this room, knock out the next scientist, and take his disk. This completes the objective. Return to the room where you shut down the primary power source.

Deactivate GPS and autopilot: Leave through the door you entered, turn left, and go up the stairs. Kill the guards at the top, then go right and up the next flight of stairs. You will find scientists; tell them to shut it down. One will pull out a gun, so kill him. This completes the second objective.

Activate Moon Pool lift: Go down the stairs and enter the door on your left. Go right and kill the guards. Follow the long hallways until you reach a room with water. Go left and activate the control panel to unlock the large door nearby. Enter the unlocked door and go down the ramp. Activate the control panel at the foot of the ramp to complete your third objective.

Rendezvous and escape with Elvis: After completing the third objective, return to the green stairs. Turn around and go back through the door on the left. Go right through the door. Navigate through multiple doors and guards until you reach a door where you meet Elvis. Follow him and protect him to complete the final objective. You should hear Elvis early on, indicating you are on the correct path.