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

Start by moving forward and turning right around the corner. Head up the ramp, eliminating any patrolling guards. Exit the ramp area, turn right, and go through the opening in the crates. Proceed to the end, turn right again to face a guard, kill him, then turn to face the explosive barrel on your left. Crouch and retrieve the Double Falcon 2 from where the barrel was. Return to the ramp, use the elevator to go to the next floor, and eliminate any guards waiting at the top. Exit the elevator and head right.

Engage the distant guard, then return past the elevator. Follow the catwalk to the right until you reach a large steel door. Pass through it and eliminate any guards on the catwalk above. Be aware of guards using the elevator to surprise you. Clear all guards in this area, then backtrack to the beginning of the level where the crate was.

Use the Action button to push the crate, then take it back up via the elevators to the top of the catwalk. 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 cause an explosion, creating 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 your right. Enter the showering room and find the Lab Disguise. Put away your weapons.

Head left and follow the hallway to its end. Go through the door on your right, kill the guard and the scientist inside. 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 completed.

Return to the hole in the wall where you first entered this area. Continue past the hole on your right and take the first right at the end of the path. Proceed until you reach a door on your left and a door on your right, both guarded. Eliminate the guards, then enter the door on the right. Destroy the machine gun in the room, then approach the computer across from where the machine gun was. Use the Data Uplink on the computer to download the virus.

Exit the room and turn left where the hallway stops. Go through the door on the right, kill the guards inside, and destroy the computer. Return to the location where you completed the conspiracy evidence objective.

Go left and through the first door, killing the guard. Take his Super-Dragon, then go through the door to the right of where the guard was. Proceed through this area, past the guard, and through the next door. A guard will speak to you and allow you passage. Approach the scientist in the rear right of the room; you will be discovered. Eliminate any guards and scientists present, then go through the next door to complete this objective.

Exit the room and go right into another door a short distance away on your right. Eliminate any guards present, take the key card, and proceed through the next door. In this room, kill the guards and take the key card dropped by one of them. Go through the next door near the glass, go around the corner, and through the final door to complete your last objective.