After obtaining a respirator and dealing with a few enemies, you'll pass through the door with the light above it, as shown in the previous section.
As you advance, another pair of commandos (15-16) descend on ropes from the skylight, and a third soldier (17) spawns on the right side of the room. Run forward and engage.
Again, it's partially down to luck, but the shotgun at very close range should help you take them down quickly, assuming you have enough ammo.
As you fight the first group, 2 more mercenaries (18-19) come up the stairs in the next room and may enter through either of the doorways opposite the entrance.
If you don't see them immediately, exit through either of those doorways and look for them on the stairs.
When you've killed them all, you're in the clear. Continue down the wide staircase, then the lower staircase on the left.
Almost directly opposite the bottom of these stairs is a doorway. Go through into a CORRIDOR WITH RED WALLS.
There's a ladies' room through the closed door to the right, in case Lara needs to touch up her mascara after all the tear gas. There's nothing useful inside, though.
Head for the other end of the red hallway to enter the next gallery and finish the level.
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