Metro: Last Light Walkthrough Part 3 – Pavel
Artyom comes to in a cell. He sees the faction at work, the Nazis, on a citizen of Hanza, apparently a suspected mutation. They go down the line of prisoners and see what their missions were. One of the red faction offers to talk, but away from the others. The commanding officer does not like that they have a Hanza, a Red Faction and a Ranger all in one place. Still, the survivor of the Red Faction will create enough of a diversion that both Artyom and he can escape. He also gives the knife he used to Artyom. He assesses the state of the door, finding it is controlled by a remote lock.
After a little thought he remembers about the garbage shoot. Head over to the shoot and your new friend will open it. Head on into it after him. Follow him down the tunnel and then turn to face to the right. He explains some of the setup here with the piping. He tells you to head forward with him after the elevator leaves. When it does, move forward with him. Keep it quiet as you cross the open chamber for your escape. Head to the other side moving through the shadows.
When you make it to the other side and wait at the gate if your friend fell behind. Your way forward is literally barred and they will not budge. Your friend will think for a bit then ask you to give him a lift. From there he will climb up onto the ladder above your position. Follow him up after he lowers the ladder. He explains a little about sneaking around.
Follow him as he moves forward. Artyom will want to follow his directions and slowly make his way forward through the fenced duct they are in. Eventually you will exit the tunnel and your friend will instruct you to take down the guard on the right. Sneak over to them and either kill them or knock them out. After that, wait for your friend to take our the other guard. Once they have, pull the lever the guard you dealt with was standing in front of.
At the top of the stairs you will want to look to the right to find the light. Unscrew the bulb to bring some more darkness into the area. Wait a little after that and the overhead light will go out as well. Move across the walkway and quickly get behind the guard patrolling on the far side. Once again, either kill them or knock them out. Head over to the right after that and climb up the ladder into the sewage pipe above.
Crawl on through the pipe to its end. There you will find a corpse with some throwing knives on it. Turn around and grab the knives from the corpse. Head over to the left and down the passage there. Get a good line of sight on the guard there and take him out with one of the knives you just got. Alternatively you can approach the creature in the cage. This will get it to make noise and lure the guard in for a slightly easier kill. Just be sure to stay hidden.
From there just go on up the walkway and then turn to the left. Wait for your friend to take out the next guard then head over to the green button on the wall near where you came up. This will get the guards on the other side to open the door. When it is open quickly take out the guard then get into the elevator. Pull the lever to send the elevator up.
When you get to the top head on out the elevator. Time to start clearing this area of enemies. You have one guard pacing the stairway on the left-hand side. It is easy enough to approach him and take him out with your knife. Now head over to the right-hand side and quietly approach the next guard. When he turns his back, take him down. From there just clear the area of the remaining guards. There are 3 more gathered on the right and 1 more on the left. When you kill them all Artyom and his friend will pull the levers by the big door. You can also pull the switch on the console overlooking the cells. This will let you release all the prisoners in the chamber you passed through. After that go for the lever to the right of the door. Pull it to get on through to the next part.