Go right and use hand-icon on door. Go up and then to the right. After the dialogue, pull lever of the ventilator in the middle of the screen. Go right and climb ladder. Use Colt on guard on the roof, then use anchor and rope to get on the top of the truck below.
Warehouses Pick up the axe from the box under the truck and use it to open the door.
Outside go to the left and pick up the wire. Go back to the warehouse and use the wire on the workbench to make a key. Go outside, left again and open the door of the other warehouse. Pick up the uniform and go out again. Go right and then cross over.