The Last Of Us Walkthrough Part 9 – Chapter 3: The Outside (Apartment to Trenches)
At the bottom go over to the right where you will find another artifact, “Patrol Routes Map”. After that start on forward through the narrow hole on the left-hand side of the room. Crouch and get going. On the far side to the right you will find the ladder. Go there and climb up when Tess prompts you. Your job is to check if the coast is clear. Joel has them wait for a patrol to pass but then calls them up.
Back up on the ground you will want to head forward and of on through the ditch in front of you. From there press forward but do so carefully. Head up into the trailer you see ahead of Joel and climb into it. Head through to the top and wait for the rest of the group.
The group gets ambushed by a pair of soldiers at the top of the trailer. Tess tries to bribe her way out of this one but it looks like a pair of honest soldiers here. Something is very odd about Ellie: she has had contact, in a bad way, with the Infected and now it is 3 weeks old. It seems she is more either resistant or immune to the spores. Either way, talking with her about it has to wait as the reinforcements are coming.
The trio hops down into the ditch and you need to start back along it. Look for the opening underneath the bridge. Crouch and head on through it. Follow Tess, when she says, over to the left and up the slope. From there drop down into the small ravine there and break to the right with the rest of the group. Keep out of the lights and keep up with the group.
Hop the toppled pillar when it comes up and press on from there. When you get to the end of the ravine you need to get into a pipe. You can sprint forward but you will need to crouch before you can enter the pipe. After that just head on through the pipe.
At the end of the pipe the group will need to advance to the concrete wall ahead. Head over to the right-hand side so you can avoid the search light from the first soldier. After that make your way carefully over to the left-hand side. There is a drainage pipe you can duck through on that side as well to just step away from the soldiers. Head on forward on the other side and drop down into the water.
While in the water you can head over to the right and climb up onto the second landing. There you will find some crafting supplies sitting around. After that just go through the door on the left and then start up the slope on the right. Loop to the right at the top and duck behind the short wall there. You will find a patrol is searching the building. Listen to Tess to know when to go. When she gives the “go” head with her to the left along the wall. Remember to avoid being seen. Enter the ruining building ahead.
Once inside the building start on up the stairs. You may hear one of the soldiers commenting on “let the clickers have them”. Just continue forward and drop down into the next part of the building. From there go straight on and you will find a shutter you can raise. Take a moment to go through one of the windows nearby and look in the dresser on the left. You will find a dresser with some crafting supplies. Grab them then head back to the shutter. Interact with it using “Triangle” then hold it to raise it up.