[8.4.]. Mission 4 - Area 51: Rescue (3)

Obtain and use lab technician disguise: Head forward, turn right around the corner, and go up the ramp, eliminating patrolling guards. Exit the ramp, turn right, and go through the opening in the crates. At the end, turn right and kill the guard. Face the explosive barrel under the crates to your left, crouch, and grab the Double Falcon 2. Return to the ramp, use the elevator to go up, and kill any guards at the top. Exit the elevator, head right, pick off the distant guard, then return past the elevator. Follow the catwalk right to a large steel door, go through it, and kill guards on the catwalk above and any using the elevator. Return to the starting area with the crates. Use the Action button to push a crate, take it up the elevators to the top of the catwalk, and follow the black catwalk until you see a small 'X' carved into the steel wall on your right. Position the crate in front of this wall and shoot it to create a hole. Enter the hole and proceed through the tunnels. On the other side, head right down the hall, take another right at the end, and continue until you reach the showering room on the right. Enter and find the Lab Disguise. Put away your weapons.

Locate conspiracy evidence: Head left and take the hallway to the end, then go through the door on your right. Kill the guard and the scientist. In the circular room, go left and press the Red Button. Turn around, equip your X-Ray Scanner, and look at the container until the objective is complete.

Destroy computer records: Return to the hole in the wall where you first entered this area. Continue past the hole to your right and take the first right at the end of the path. Continue until you reach guarded doors on the left and right. Kill the guards, then enter the door on the right. Blow up the machine gun, then use the Data Uplink on the computer across from it to download the virus. Leave the room, take a left where the hallway stops, and go through the door on the right. Kill the guards inside and destroy the computer. Return to where you completed the previous objective.

Gain access to autopsy lab: Go left through the first door and kill the guard, taking his Super-Dragon. Go through the door to the right of where the guard was, run past the next guard, and go through the other door. A guard will let you through. Run to the scientist in the rear right of the room to become uncovered. Kill any guards and scientists, then go through the next door to complete this objective.

Rescue crash survivor: Exit the room, go right, and enter the door a few feet away on your right. Eliminate any guards, take the key card, and continue through the next door. Kill the guards in this room and take the key card another guard drops. Go through the next door near the glass, go around the corner, and through the next door to complete the final objective.