
The duct leading out of the ROOM WITH THE FISHBONE LADDER, detailed in the previous section, brings you to a corridor with a patrolling security guard. If you want the "Mission Impossible" achievement/trophy, you can't let him spot you. If he does, he'll run to the left end of the hall and activate a machine gun turret. Not fun. To avoid being noticed, do not advance beyond the double lines where the duct segments join.

Set the HK on sniper mode. Use the scope (Look button) to line up a headshot as the guard passes back and forth. If you're careful, one round will take him down.
NOTE: Enemies killed in stealth are not added to the count on the in-game Statistics screen. See the footnote in the main walkthrough for details.

Now you can roll out of the duct. There are deadly lasers crossing the hall just beyond the Fizwiz Cola machine. To avoid them, shoot the vent near the floor opposite the duct where you came in.

Crawl in and around the corner to the point where Lara can stand.

Shoot the next vent and crawl out.

Cutscene: Zip points out the sleeping guard in a nearby office and suggests that Lara sneak in and steal his access card.
IMPORTANT: If you are hunting achievements/trophies, save the game in a new slot and do not overwrite this save. You'll have to reload at least once to unlock both "Dodge This!" (one-shot five guards in 20 seconds or less) and "Mission Impossible" (complete the level without being noticed). In the next section, we'll go for the five headshots then reload and continue in stealth.
If you don't care about achievements, skip the next section and stealthily approach the sleeping guard to get his HIGH-LEVEL ACCESS CARD, as shown here.
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