Exit and walk through the barbwires to the left. Stand against the block and press Action and the up direction key to climb on the block (1). Climb on the ledge to the left (2) and then climb up the grating. Dismount on the ledge on the right hand side and turn around (3).

Jump to the stone ledge that is hanging from the crane (4) and use the part where there are no railings in order to climb on the crane (5).

Turn to face the wall where you climbed the grating and take a diagonal running jump to the right hand side to land on the ledge above the one you dismounted before (6). Jump to the next ledge (7), turn left and jump up to grab the edge above (8). Pull up and slide into the alley where you got the Crystal and the Shotgun Shells before.

Once again, climb on the block in the corner and then on the ledge that overlooks the crane. Turn left and take a diagonal standing jump to grab the back-side of the sloped roof (9). Shimmy to the left a bit and pull up to slide on the ledge where you started the level (10).