From Halopedia, the Halo wiki
- Start the level at Rally Point Bravo. Progress with the level as usual.
- Once you have cleared the landing zone for the Pelican, run back to the ledge near the cliff. There are two crates here.
- Move one of the boxes next to the adjacent large rock. Look up, and you will see an opening in the rock wall (not the opening in the rock roof); this is where you are aiming for.
- Jump up on the box, facing the rock, and use the railgun to launch yourself up to this opening.
- Jump down to the other side and go to the left to avoid a killzone on the right. You are now out of the map, and may explore.