Dead End
Timing is pretty important in this first section so pay attention to cues to know when to move.
When you first start, crouch down and start walking towards the guard station on the right side of the road. There are two guards crossing the street from the left over to the guard station. Wait for them to get there before getting to the guard station yourself. Once they are there, climb in the window and take cover against the table with the TV on the left. There will be a guard at the door behind you and then another just outside the window, leaning on the frame in front of you. Wait for the leaning guard to cross the street. When he does, face the back wall and use the terminal to shut off the Primary System.
Climb through the next window in front of you and quickly make your way across the front of the cars. Just beyond them, you'll see piles of lumber on the left side that you can take cover behind. Do so and look across the street. You should see a man next to the building across the street who is either bent over working or about to turn around and walk to the left. When he walks past where he could see you, keep moving forward on your side of the road.
You'll pass a pile of boxes with a wrench on it and you'll see a "rattle snake" sign to the right. Move along the fence until you get to the back right bumper of the jeep. Wait there and look through the windo to see the guard that is diagonally across the street from you. Wait for him to turn around and leave, then crouch walk to the guard station on the right side. Take cover under the window and wait for the guards to have their conversation. When he says something like "It's time to get back to work," wait for the guard to turn and leave before climbing through the window. Disable the Secondary System in here before leaving the way you came in.
Walk past the jeep and when you get to the tail, walk across the street diagonally towards the building on the other side. On the other side of the street, stick to the right side of the building and keep the barrels on your right. Go left a little so you move along the right side of the blue fence ahead. Stick to the fence as you move ahead and watch for the guard. You'll see him standing by a bunch of wooden barrels and logs looking towards the main mill structure.
Stand behind him while he looks at the mill and wait for him to turn left and walk away. Take cover where he was and wait for him to start walking into the barn on the left before rolling to the barrels. From the barrels, walk into the barn behind him. In this middle of the barn will be a large metal machine. Take cover against the side closest to you. The guard will walk up and around the corner. Soon, he will come back down the hall and walk around the left side of the machine. When he starts walking around the machine, you move around the right side.
Take cover at the far side of the machine from where you were so that it is between you and the guard now. Look down the hall that he came from and if you think you can make it safely to the door on the left, do so. It will be hard to judge because there are quite a few men at various distances. They can be hard to see because your vision will be a little fuzzy at range and their outfits are good camo for this area. Use your instinct to try and help you, especially by tracking trails since you should be able to see those coming even if it's from across the entire yard.
You may have to play your game with the guard again and wait for him to come back for a second opportunity. When you get the chance, go for the door and turn left into the room. In the left corner of this room next to the TVs will be Evidence. Grab that if you can and then head for the doorway on the right.
This door will put you in a hallway with windows so stick to the wall under the windows to keep from being seen. A guard should take position in the next doorway but his position should allow you to walk right behind him. Do so and make your way to the exit just beyond him.
Old Mill
Go up the stairs to the right and cross through the large room at the top. There will be a small room to your right with a hiding crate and to the left will be an electrical box, sabotage the electrical box and hop in the hiding spot. As soon as the guard starts working on the electrical box, walk past him and down to where they were playing games. Grab the Evidence. on top of the TV and then turn right.
You'll see a room with a dummy sitting in a chair on the left. Take cover in that behind the half wall so you covered from all angles. As soon as the man has broken line of sight, round the corner to the left so that you're in the next area with the first aid kit. There should be a guard looking at the boiler. You need to move quickly, grab the keycard from the table under the stairs and then get up the stairs before the guard turns. To get this to work, your timing has to be pretty impeccable. The alternative is that you could simply grab the Evidence and sneak by the TV but wait a full cycle for the next guard. Wait for him to go up the stairs, take cover behind the logs in the middle of the room, have him come back down and then go.
Move up the stairs quickly (but don't run, he'll hear you). The guard will come up the stairs behind you but as long as you keep moving, he shouldn't catch you. Keep going until you come to a broken bridge. Cross by sticking to the ledge and on the other side, go through the double red doors.
Descent
Turn left and go down the stairs. Drop off the ledge and then slide down the ladder ahead. Use the ledge attached to the small shed to move around the outside. Halfway around, you'll come to an open window with a man talking on his phone. Wait for him to finish and then hop through the window behind him.
Go down the stairs behind him and there will be a guard ahead. Wait for the guard to go down the stairs to his next watch post and then go down the stairs and turn left into a little nook. Let the guard return to the top of the stairs and then leave the nook. Go down this next set of stairs (away from the red flare). Move into the next nook on the left and peek out to find the computer up ahead. When it is safe to do so, move past the computer to the column just beyond. Take cover behind it and put the column between you and the nearby stairs.
Wait for the guard to come up the stairs and then head back down the stairs. As he goes down, follow him down and hug the right side of the wooden catwalk. Drop down on the side of the walkway and then slide your way past the security gate. Wait for the guard to leave and go back up the stairs again. Pull yourself up and walk to the right.
Go down the stairs and stay a little to the right. You'll see a guard to the left and a guard to the right. Just past the guard to the right will be stairs that lead down by his left side. At the bottom of the stairs will be a checkpoint.
After the checkpoint, make your way down the next set of stairs but before going down the set just after, take cover against the outside wall. Slide down the wall and at the end, you'll see two guards talking. They'll head off for a briefing elsewhere in the caves. Follow them as they walk through the gate. If you don't make it through before it closes, you can open it with the keycard you picked up in the Old Mill area OR go right and make your way down on the outside.
Follow them down to the area with tracks and mine carts. Against the left most cart will be a wrench. Grab the wrench and then turn around. Opposite of where the briefing is going on will be a small room. Walk through the open doorway and head through to the end. Take cover behind the furthest half wall and wait out the conversation.
After the conversation ends, a guard will move to the left area where you can't see him and another will move straight to the right and pace back and forth. Wait behind the half wall and the guard from the left will come over and stand in front of it. He will continue to move right but the other guard will move back left. Wait a little while longer and both guards will be off to the right side.
Take the wrench in hand and throw it well to the left of the guard in front of the opening. This will draw his attention and allow you to get through the door. Cut through the middle of the room between the mine carts and past the guard's post. Immediately turn right and slink away.
At the end of the short hallway, take cover at the corner and you'll see two guards talking. One will insist that they go for a walk. Let them leave and then go to near where they were. Inside of the room will be a set of guards. You'll need to sneak past them to the right, round the corner and then cross from cover to cover. Keep going in this direction and you'll come up behind the two guards who were talking.
Stick to the left wall and round the corner. They won't notice you and you can go around another corner to be completely out of sight. Wait for their conversation to end and they'll move back towards their old post. When they have, go past where they were and flip the switch nearby to turn power on to the elevator. Head back down the stairs to the elevator and hit the switch.
Factory Compound
Climb up the nearby stairs and then follow the tracks ahead slowly. The guard ahead of you will walk forward and turn right but you don't need to do that. Make sure to watch for the sniper on the right of the mine entrance as you leave. Continue in the direction the tracks were going and you'll see that they lead you to a bridge.
Be careful as you approach the bridge because there are quite a few guards surrounding it. Wait until the first guard is positioned on the left side of the bridge. Get onto the bridge and drop off the right side. You can slide all the way to the end of the bridge from here. On the other end, pull yourself up and then immediately head to the right. You should find some gas cans and a checkpoint. Hit the checkpoint and then move back to the bridge to go left instead. First take cover at the pipes, and then when you think it is safe to do so, move towards the building on the cliff. Slide along the ledge on the outside and then take cover at the tail of the truck.
There will be another truck to the left. Watch for the guard and mechanic in between and then move to that truck as well. Near the tail of the truck will be a fence with a hole in it. There will be a guard just beyond that window that walks in a circle around the house in that yard. You need to watch for where he is in that circle and for the guard in between the two trucks that you just passed. Get through the window when it is safe.
Move along the house and then move to the stack of pipes to the left. If you look ahead over the stack of pipes, you'll see a shed to the left and a fence directly ahead. The fence will have an opening but it is watched by a guard leaning on the shed. Take a gas can and throw it in the direction of the lockers attached to the shed. You want to do this right about when the other guard has walked to the back corner of the house away from you. Toss the can and as soon as the guard moves, make a dash for the gap in the fence. Turn right and go up the short set of stairs. Start climbing the ledges on the side of the building.
The ledges will lead you to the top of the building but be careful of the guard patrolling. Wait for him to be on the other end and then make your way over to the ladder that leads down in to the building.
Inside the building, hit the checkpoint nearby and grab the wrench. Find the only door out of this room and open it. You'll find an office just beyond the door. Take cover against the counter that blocks off the two sections. Wait for the conversation to resolve itself. Wait a little bit longer because there will be a lot of foot traffic. When it finally seems clear, double check and then round the corner of the counter and go through the door at the end.
This will put you in the bathroom but you need to be quick because you'll have company soon, turn the corner to the left and then search the left wall for a vent. Climb in and then when the worker makes it over to the bathroom, come out of the vent on the other side. You'll be behind the counter now. Simply walk forward and then through the door on the right without disturbing anyone.
The next hallway will be pretty fancy. Go down the stairs and at the bottom, take cover at the corner. Wait for the guard to come in and comment on going to take a smoke. When he leaves, go over to the door and take cover at the corner. Open the door and look in. Just through the door will be a black couch.
Walk through the door and talk cover at the couch. Go to the far right side so that you are actually taking cover behind the column with the mine in it. Take the wrench in hand and throw it over the heads of the guards in the middle. As soon as they turn their heads, move to the next column to the right. From there you can just change cover to the right.
On this cover, go to the end and around the corner. Wait for the guards to be in a good position and change cover to the right a few times until you come to another black couch. Move all the way along this and at the end, wait for the guard to leave. Transfer to the column to the right and from here, walk into the hallway with the elevator. Go to the end and hit the switch to summon the elevator. Get on when it arrives.
