From the start, turn right and circle around the building until you find a path leading up some stairs into a door below a large bulbous sculpture. Kick in the door and head across the lobby area here and into a long hallway. Follow it to the end and you will be greeted by a security system controlled door.
Following the brief cut-scene you will be in a dark room with Jack providing some basic light. Follow him through a couple of tunnels and a storage room and he will stop moving in another, smaller room afterwards with a flamethrower sitting on the floor. Head into the adjacent control room and use the power box on the wall to reactivate the power. Head back to the storage room and turn right, use the control panel next to the door here to open it.
Head into the room and you will be attacked by a bunch of wretches. This is a good opportunity to test out the flamethrower if you picked it up. Once the wretches have all been dealt with, continue down the left side of the room until you find a door that has a wall mounted wheel next to it. Head back outside and talk to Baird and Cole.
Now for the most annoying part of the level, Marcus and Dom will have to carry the explosive charge between them. This means they are linked together and their movement is encumbered by not only the wieght of the box, but also each other. Cruising around at walking speed not as easy as it was a few minutes ago. You will still be able to use your pistol which is better than nothing.
Move forward to the door that you just exited from; there should be a loading elevator directly in front of it. Take it up to the door and continue inside. After entering the room, the door will slam shut behind you and a group of wretches will move in for the kill. Shoot them or melee them to death and Jack will open another door directly in front of you. Follow Jack through the door into the lobby area, defend your self from some more wretches and then make your way into the long tunnel back to the security door. As you move down the tunnel five or six wretches will break out of vents in the ceiling and drop down to attack you. Eliminate them and take the box to the door at the end of the corridor to complete the chapter.
