Facing the entrance, hang from the edge of the pillar ahead, which is next to the extended part.

Release to grab the handhold below and climb to the next one on the right. Release three times...

... to grab the lowest handhold.

Traverse to the right around the corner. Climb to the small handhold on the right and release twice to grab the lowest handhold.

Traverse to the left around the corner and release to grab the small handhold below. Jump to the right to grab the handhold on the sloped pillar and traverse to the left.

When you reach the end, jump back to grab the handhold on the first pillar. Traverse to the right and drop on the beam.

Walk to the other side and jump to grab the crevice in the pillar ahead. This a long jump, so help Lara grab the crevice by pressing the Interact button. Then jump to grab the narrow ledge on the pillar to the right. Lara will grab the right part, so traverse to the left around the corner.

Pull up and perform the Chimney Jump to grab the handhold on the right hand pillar.

Traverse to the left around the corner and drop on the beam. Walk to the other side.

Jump to grab the narrow ledge on the pillar ahead. Traverse to the left around the corner and pull up on the wider ledge.

Perform the Chimney Jump to land on top of the right hand pillar.

Turn right, jump to grab the walkway and pull up.