

Interact with the switch on the lift to summon it and hop aboard. You'll emerge on a walkway overlooking a large cavern. Once you clear out the room, comb the place for additional Battle Rifle ammo, then proceed through the far door and continue through a hallway. Look for a case of grenades resting on one of the nearby boxes here, so use them liberally. Section 3 Use the receded corner preceding the third section for cover. Hang back by the corner and open fire on the Brutes beyond - while there's another air duct above you can make use of, we've found it's difficult to target the enemies in this section from there, so stick to the ground. Section 2 Once you've killed everyone visible from the air duct, drop through one of the holes and continue through the hall. If a group gathers, toss a grenade to take them down. Also, try firing off a few shots to catch the Brutes' attention. Now turn around and roam the duct and peer down the ventilation holes to fire at the enemies below - your viewing range is pretty limited, so try circling the holes and duck down to increase your line-of-sight. Section 1 From the get-go, climb the left-most ladder up to the walkway and follow the left wall up to a ladder leading into the air duct - climb quickly to avoid taking fire. As such, there are numerous methods to get through this room, but here's our suggested process:

Unique to this room is a ventilation duct in the ceiling you can use to ambush the enemy from above. We've divided this long, winding corridor into three section one for each time it switches direction.
