h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Industrial Rooftop
Now that you are back outside, jump up on top of the small platform to reach the ladder. Climb up it and Lara will point out a wire overhead. Jump up and grab it to shimmy yourself across to the next rooftop. As you do a helicopter emerges and takes a few pot shots at you. Keep climbing across and she will tell you to tuck her legs up. Keep climbing and hop down when you reach the small shack on the roof. Run behind the boxes and grab the health there. While you are still behind the boxes, walk down the roof and grab the ledge as you slide off the edge.

Look down to find a walkway below you that you can drop to. Drop onto it and enter the door there. Follow the dark hallway to the end and go left through another door. Keep going until you come to a large room that you can grab some heath and ammo in. Make your way out the door and across the rain soaked walkway. To the left of the door is a ladder that you can climb down but it has a far drop at the end of it. If you have the health, go ahead and climb down it and drop at the bottom. Beside where you land will be a box that you can pull. Pull it over so that it is under the ladder. Now you can climb back up and you also received leg strength that you will need very soon. Head back up the ladder and into the door. Follow the stairs on the left down and hang off the edge to drop to the ledge below you. Follow the catwalk around to an outstretched part. Lara will make a comment about how she can make the jump.

Jump over it and grab the ledge on the far side. Shimmy your way to the left to where you can pull yourself up. Make your way over to the ladder and start climbing. When you reach the top, hop off to the left and jump across the small gap to the door on the other side. Follow the hallway along until you reach another outside area. Jump across the gap to the catwalk across from you and head up the stairs to another door. Enter it and climb up the ladder to eventually reach a small shack on top of another roof. Head to your left and back to the corner where a cut scene will start.