Having the wall to your back, approach the front left corner of the ledge and jump down to the ledge below. Go to the other side, being careful of the opening in the floor. If you fall through it, you will end up in the toxic pool.

Jump to the ledge below, or jump to grab the handhold on the left and drop down. Then drop the lower ledge.

Stand on the left side of the ledge and jump to the stone beam ahead, where the part is solid. If you attempt to jump on the broken part of the beam, Lara will fall down. Jump to the right hand side of the next beam, then the left side of the third beam. Finally, jump to grab the ledge ahead and pull up.

Turn right and jump to the square ledge below.

Approach the front left corner and jump to grab the handhold on the left wall. If you cannot do that, hang from the edge of the ledge and traverse to the right towards the wall. The jump back to grab the handhold. Jump to grab the next handhold on the right and shimmy around the corner. Jump to grab the next handhold and finally jump to the ledge on the right.

Still having the wall on your left, walk up to the edge of the ledge and drop to the next ledge below (or hang and drop). Go to the other side and jump up to grab the handhold on the wall. Traverse to the right and release to grab the lower handhold.

Climb to the right, then downwards until you see a ledge on the left. Jump to that ledge and go left.

Jump to the next ledge and go to the other side.

Jump to grab the handhold on the right wall and traverse to the left. Then jump to the angular ledge. Go around to the right into a small passage where you will find the next Treasure (5/6) in a small opening in the wall. Return back to the angular ledge.

Jump to grab the handhold on the right wall and jump to the next ledge on the left. Go down the two ramps to reach the end and turn left. Jump to the narrow ledge below and proceed forward to step on the lower part.

Hang from the right edge and drop on the slope to slide to the ledge below. Go to the other side and jump to grab the extended part of the opposite ledge. Pull up.