Locate the stone ledge with the destroyed corner. Jump to grab the handhold to its side, then climb on the ledge. Pick up the Health Pack and...

... use the Grapple to catch the metal ring on the wall above.

Approach the wall and press Jump so you hang from the cable. Wall run and jump to grab the handhold on the wall to the right.

Traverse to the right and jump to grab the next handhold.

Shimmy around the corner and pull up on the beam. Turn right 45 degrees and jump to the next beam.

Then walk to the wooden platform.