Whynin

Use lethal force at will.

While Lambert is still talking, look through the window in the door ahead and you'll see a terrorist guard walking to your right. As soon as the level has loaded, bust through the door and knock the terrorist out with your elbow. You should be able to do it in complete darkness, without alerting either of the civilians that are sitting in the terminal. Hide the body and pick up the data stick on the guard that has the key pad code you'll soon need. Shoot the terrorist dead with your pistol--it's more silent than the rifle--and approach the closest civilian from behind. Before you reach him, the civilian will automatically stand up and move to the other side of the walkway. Leave him be, as he now has his back to the area where you want to walk.

Stay on the left side of the room and silently creep behind the two civilians. When you reach the end of the hall a real airport employee will show up. Lure him into the shadows behind the wall by letting him see you (since it's so dark he'll inspect what he sees instead of immediately sounding the alarm) and knock him unconscious. Then, use the new key pad code (5325) to open the door at the far end of the hall.

At the very end of the hall just ahead is a mounted camera that's unfortunately indestructable. Shoot out the lights that line the hall, and use your camera jammer to get by the camera. You can then shoot out the final light in the hall and leave the camera completely blind. Here you'll hit the first Checkpoint.

After hitting the checkpoint, immediately run into the next room and you'll meet up with a terrorist in a dark corner. Quickly knock him out, and then make sure that the civilian sitting at his desk doesn't reach one of the two alarms on the far sides of the room. Knock out the civilian, and then take a moment to kill the terrorist after hiding both bodies.

There are two exits to the room with the terrorist and the customer service guy you just knocked out. Take the left exit and you'll reach a balcony with a long walkway to your right. Take the walkway slowly, and as you near the end two civilians will come out and stand facing off the balcony. Make sure they don't see you, and once they're positioned where they're staring off the balcony, sneak up behind them. Use your elbow to knock out the man on the right, and the man on the left will run down the walkway. Chase him down and when he tries to open the door on the far end of the hall you'll have a chance to knock him out. Hide both bodies and listen to your commands.

You'll now need to go down the escalators where you can get a vantage point to spot Soth and his men. Be careful, though, because above the door at the base of the escalators is a camera. Use the camera jammer to get underneath it. Once you're under it, you can let go of the camera jammer and let the darkness hide you. From the bottom of the escalators, equip your thermal goggles and binoculars and look through the thin metal sheeting in the center of the huge hall, below you. Almost directly beneath Sam you'll see three orange figures. Zoom in on them and you'll get a radio message from Lambert, identifying Soth. The three will walk off, and that's your cue to leave. Go through the doorway just beneath the camera to enter an elevator lobby with two cameras in it. Use the camera jammer to get by them (or just shoot out the lights in the room) and call one of the elevators up. Get inside, and use the lift to hit the next Checkpoint.

After hitting the checkpoint the elevator stops. Shoot out the ceiling panels and jump up to climb out of the car. Climb the front-right cable up to the next cable car on your right. Climb on top of the new car and you'll find a place where you can drop onto on the front, where you'll find some ammo and a sticky camera. As you pick up the items you'll hear the conversation of Soth on the phone. The large room ahead is littered with catwalks, and if you look above Sam you can see Soth and his men. On the catwalks below are three or four civilian workers.

There are two ways you can go about taking out Soth and his two henchmen: the easy way, and the even easier way. If you want, you can try and be methodical, taking out the lights below with your pistol and knocking out the workers below. But since you don't have to worry about alarms at all in this room, you can go straight for Soth's throat and kill the three of them. Only problem then is that once Soth is aware of you, a time of one minute will start counting down. You'll need to kill Soth and his two men, and then climb the catwalk ladders to reach the platform where Soth is and touch the smallpox container he has.

Drop down onto the catwalk and move to silently to the right. You should reach an area where you can get a clear head shot on all three of your enemies above you (equip your thermal goggles if you're having trouble finding them). Quickly snipe them all, starting from the left-most guy and moving to the right. Once they're all dead you should have between 45-30 seconds of time left on the clock, which is plenty to reach the smallpox container. Run down the center catwalk platform (moving away from the area where you dropped down) and take a left before you reach the end of the walkway. Keep moving to the left and then take another left once you reach the corner. Climb the ladder to your right to reach another catwalk with yet another ladder. Climb that ladder, and move along the wall to drop onto the catwalk below you. From there, simply run to the far end of the catwalk (again, away from the area where you dropped into the room) and touch the smallpox container to end the game. Boo yah.