NOTE: The map in the main walkthrough uses an orange arrow to indicate the path from the second switch to the third switch.

In the previous section, we retrieved the final golden rose in the game and pulled the nearby switch. The toxic gas is still flowing, so don't linger here. Roll and run straight across the room and through the door where you entered.

In the next room, 2 soldiers (11-12) (61-62/62) will try to stop you. These are the final enemies in the game, so feel free to use your remaining ammo taking them out, or just run past them through the door on the right. If you do want to kill them, I'd suggest running into the room with the HK drawn and set on burst or rapid mode. Veer to the right...

...and take out the first soldier guarding the doorway.

Then roll...

...and target the second soldier, lurking in the corner near the low platform.

Roll once more and run through the door where the first soldier was standing.

In the next room, you can crouch to replenish Lara's air meter. Then continue through the door on the right, which was previously locked.

Jump up on the platform and pull the third switch to pump the poison gas from this room into the next room, killing the cyborg (not counted).

You can watch this happen through the window. When he expires, the "Gassassin" achievement/trophy pops.
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