Shantytown - Sneaking Around to the Helicopter

From this fenced-in walkway, you can see the helicopter ahead.

Go forward and use the narrow beam to cross the gap in the walkway.

Continue around to the left and jump down across the next gap. Lara's cry of pain gives her away. So immediately move behind the metal box ahead on the left.

Shoot the 2 enemies as they approach. The one with the axe and machete runs toward you like the psycho he probably is. The one with the rifle has enough sense to hide behind a crate, but you should be able to get him with a headshot when he peeks out.

Loot the bodies and grab the arrows leaning against the next crate. Then continue up the hill. As you round the path, ignore the rifle/SMG ammo for now. (Make a mental note of the raggedy scarecrow-looking totem hanging above the rifle ammo. This is one of the Challenge Items in this area. You'll need to destroy it in a little while, once you have the necessary gear.)

Instead concentrate on the third enemy guarding the back of the helicopter. Take care of him, loot his body, and then grab the rifle ammo if you need it.

For now, use a rope arrow to open the hatch on the back of the helicopter. Enter to trigger a cut scene.