1. Start by climbing over this fence.
2. You want to work your way to the indicated door. Wait here until the guards have their backs to you, then proceed to the area in front of the barrels directly ahead.
3. Wait by the barrels until the guards are in this position, then quickly advance to the door. Alternately, Rudy writes, "Go behind the barrels and turn the wheel...cut scene follows, drop into the pool and walk to the end, sneak out and go in the door..try it."
4. Once inside, use this computer for a data stick. Note the medical kit on the floor by the back wall.
5. Pass through this door and immediately sneak along the right fence to avoid the guard. Your notes are updated -- use your heat vision to detect landmines.
6. Climb the fence.
7. Use your heat vision to avoid the land mines. Use your night vision to avoid the search lights.
8. Make your way left behind this crate. The door visible on the left is bait, avoid it. Instead, your destination is indicated by the arrow.
9. Hug the left fence to avoid the mines.
10. Here's your next spot to relax.
11. Mantle onto this crate between the two mines.
12. Watch the pattern of the search lights here. Time your movement so you can mantle across the box to the other side undetected.
13. Almost out. Head through the doorway straight ahead to exit the minefield. Whew!
14. Grab the medical kit (inset) before climbing on this dumpster. Perform a double-jump from this position, moving in the direction of the ledge above as you jump.
15. Mantle onto the ledge.
16. Pass through the open window ahead.
17. The antenna is your objective. The stealthy approach is to mantle along the sign on the right then hand-over-hand along the cable to the sign's left.
18. A more direct approach results in these guards spilling out this door, and easily taken out.
19. Throw this switch to complete the objective. A cutscene plays.
20. More guards spill through the door, the final one has a satchel with a medical kit. Hide the bodies under the stairs. Pick the lock and pass through the door.
21. Descend the left stairs.
22. Disable this wall mine. Again, only approach in small steps in sync with the green light.
23. Use the computer for a data stick. To the left are two wall mines and a frag grenade.
24. Return up the stairs and pass through this door. Descend more stairs and go through another door (inset).
25. Climb over this railing then drop to the floor below. Crouch before you land to silence your fall.
26. Take out these three in quick succession: under the railing; by the right toilets; in the hall through the left door.
27. Hide the bodies in this corner. Grab the medical kit.
28. Use this computer for a data stick.
29. Pass through these double doors.
30. Pause here and listen to the enemy intercept.
31. Quietly enter this door on the left (inset). Pause to listen to a communication from Lambert.
32. Interrogate this soldier. Knock him out and put his body in a dark corner. Use the computer on the table for a data stick. You'll find 5.56MM ammo next to the computer.
33. Head back to the hall and drop through this open grate.
34. Climb this pipe.
35. Jump onto this ledge and pull yourself through.
36. Drop a frag grenade through the ceiling and take out two executioners. Ready your SC-20K and drop through. Shoot the third executioner to complete the objective. Take three satchels for a data stick, a frag grenade and a medical kit. Hide the bodies in the dark corner.
37. Wade through the icy fog.
38. Turn on your heat vision and shoot the enemy soldiers. Unfortunately they can see you, too.
39. Climb over this meat locker (inset) and deactivate the turret.
40. There are three more soldiers in the freezer beyond, and a fourth in the next freezer may enter as well. Head shots with your pistol are an effective remedy. Check their bodies for a frag grenade and a data stick.
41. There's a turret in the next room. A mad dash to the right will get you by it unscathed. Return behind the turret and deactivate it.
42. To the right you'll find this medical kit. Continue through the door visible in the back.
43. Continue to this doorway. Toss a frag grenade and take out these two. Drop their comrade with a head shot from your pistol when he investigates.
44. Drop through this grating then emerge out the other side.
45. Descend these stairs.
46. Your trusty pistol will handle the patrolling guard. Hide the body in the dark stairway (inset).
47. Throw this switch to slide open the panel below. Continue through to load the next area.
48. Emerge through this archway, but only partially. Sit tight and wait for this guard to come into position (upper-right). Pistol head shot. Ditto his comrade who investigates (lower-left). Hide the bodies in the tunnel.