OBJECTIVE: Locate and Kill Paxton Fettel
After talking to the F.E.A.R agent and SFOD-D soldier go straight on, behind the building, and then turn right. You'll get to the stairs leading down. Open the door and get inside the building.
Keep walking down the only available path until you get to a room with generators and technicians' corpses. On the shelf there is a Medkit - you can see it in the picture on the right above.
Go past the generators and go up the stairs. The corridor will lead you outside to the empty tank and a metal bridge, which is over the tank. Cross the bridge and turn right, then jump down over the rail.
On the left side of the tank, next to the boxes, you'll find a Health Booster. Now, you should go left round the tank till you get to the stairs. The stairs lead to the right, to a door which will take you to the control room.
Inside you'll see a phone. Listen to the voice mails and then activate the switch on the left. The bridge will turn and you should exit using the door through which you entered this room. Cross the new bridge to get to the other side.
Go down the two ladders, then keep walking down the only available path till you get to the dark, long tunnel. Turn on your torch and go forward.
In a small room on the right there's a Health Booster on a barrel next to the skeleton drenched in blood. Take it and turn around. You'll see a ladder depicted in the picture on the right above. Climb it up to the very top.
Once again you'll be able to catch a breath of fresh air. Using the ladder on the right go down to the water. Crouch and cross the canal to pick up the Medkit, you can see it in the picture on the right above. Then go up the ladder.
Cross the bridge and open the door. Lean right carefully - on the left there's a soldier. Aim, turn on Slo-Mo and kill the enemy. Next, hide by the wall on the right, just as it's depicted in the picture on the right above. There's another adversary in the room - he'll either jump out of the window or get out through the door. In both cases, he's definitely going to fall into a trap you've set. The third one may exit through the door, next to which you saw the first one - if he doesn't, just approach him yourself.
Kill him, and also the last one who's on the right, using Slo-Mo. All of the adversaries were carrying G2A2 Assault Rifles, which, of course, you should pick up. Go back and go downstairs. On the table you'll find a Medkit and an N6A3 Fragmentation Grenade (the picture on the right above).
Go upstairs again and enter the room on the right. On the control panel there's a Body Armor, and on the floor there's an RPL Sub-Machinegun. Now, keep walking down the corridor to a tall room with tanks, which you can see in the picture on the right above. Cross to the other side and take a G2A2 Assault Rifle from the table. The further pathway is shut down, thus go downstairs.
Find the entrance depicted in the picture on the left above - keep going down the short corridor to the very end and crouch in order to get to the Reflex Booster. Go back to the room with tanks and go upstairs.
You'll surely get to the locked door. Shoot at the padlock and go inside. You'll get to the ladder, go up and keep walking down the corridor till you see the pipes. Get on the pipes and cross to the other side. You'll get to a metal plate - break it down. Jump down to the corridor.
Go forward and then turn right. Crouch and go under the windows on the left. Lean out and switch to Slo-Mo - you'll notice three soldiers armed with RPL Sub-Machineguns. Try to kill them all at once, aiming at their heads.
Get to the place where you saw them standing, switch Slo-Mo on and turn right - you'll meet another adversary in the corridor. If you have enough Slo-Mo left, your enemy doesn't stand a chance. After killing the last adversary, pick up the soldiers' weapons and go back to check the room. On the left you'll find an AT-14 Pistol on the desk.
On the right, in the corner of the room there's a Medkit on the desk. Take it and return to the corridor where you killed the last soldier. Go left and take a Body Armor, two RPL Sub-Machineguns and an N6A3 Fragmentation Grenade. Next, get near the stairs, go right, along the room (there's nothing worth investigating inside). You'll get to a room with pipes on the floor and three soldiers. They're carrying RPL Sub-Machineguns. After you've mopped up the place, don't jump over the rail - just go right.
Take a closer look at the wall on the right - you'll find a Medkit. The corridor leads to a room where there's another Medkit lying on a metal shelf. Exit through the door in front of you, get to the room with pipes and pick the soldiers' weapons up.
On the right there's a ladder - go up, and then cross the metal bridge to get to the entrance on the right. The door in front of you is blocked, turn left and take the Body Armor and two G2A2 Assault Rifles located on the right, and a Medkit, which is on the wall.
Go inside the room on the left. Check the laptop on the desk and go to the next room. Here, you'll find another Medkit on the shelf. Then, go to the corridor and turn left.
You'll find yourself in a room where you can acquire a Body Armor, an N6A3 Fragmentation Grenade and an RPL Sub-Machinegun. Next, go back to the corridor and go left to the double door. In a big square two soldiers will come out on the left side. Turn Slo-Mo on, try to kill them both at once and quickly hide. Four more soldiers will run out of the door in front of you. Hide, lean out and kill them one at a time. What's extremely important is that you should be wary of the grenades. It's best to save the game before the whole operation.
Once all of the enemies are dead, pick up their RPL Sub-Machineguns. On the right there is a Body Armor and a G2A2 Assault Rifle on the boxes, which are located near a small house. Inside you'll find a Medkit, a G2A2 Assault Rifle, an RPL Sub-Machinegun and a Body Armor.
There are no other interesting things to find in the square. Approach the door from which the soldiers ran out. The corridor is a slippery path that will lead you to a room with water. Jump into the water and go up the ladder to the bridge. Then, get to the door and go up the stairs on the left.
Before you turn left to go up to the very top, turn right and take the Medkit, which is hanging on the wall. Afterwards, follow the only available path along the pipes until you get to the ladder, which is depicted in the picture on the right above.
Pass between the generator and the box, and turn left. You'll notice an opening - jump into it. Once more, you'll have a vision - just get near the double door and you'll go back to the real world - and to the next stage.