The 13th Floor - Laser-Testing Lab to Iris Room
After taking out two armored soldiers and obtaining the IRIS LAB ACCESS disk, as shown in the previous section, you used the disk to enter the next area.
Advance to the second window but no farther. Behind the glass, a worker in an orange jumpsuit (inaccessible) is testing a laser. A patrolling guard (later) paces the hallway outside. If he sees Lara, he'll run to the far end of the hallway, activate the gun turret on the ceiling, then attack. But as long as you stand back from the corner, you can observe his movements through the window, and he can't see Lara.
Wait for the guard to approach. Then as soon as he turns and starts to move away, walk or crawl after him.
Follow him without hesitating. As he rounds the next corner, move into the second doorway on the left.
Position Lara at the back of this alcove, on the right, and the guard should not spot her when he passes.
You can stand or crouch facing the windows and use Look to watch him. If necessary, wait for him to do another patrol. Then, as soon as he moves past you, heading to the right...
...start walking up the ramp and turn left, away from him.
When you reach the corner, turn right, then run toward the SMALL CONTROL ROOM at the end of the hall.
Cutscene: Zip tells Lara that the next door requires two access cards used simultaneously. He advises her not to kill the worker since she'll need his help to open the door.
When the cutscene ends, immediately run into the CONTROL ROOM and hide in the near right corner.
Stand near the angled wall between the doorway and the worker in the orange suit (later) and make sure Lara has not been noticed by the guard. If he starts running, you've been spotted. If he approaches, then turns and walks away, you're good.
IMPORTANT: Save the game in a new slot and do not overwrite this save. You'll have to reload at least once to unlock both "Mission Impossible" (complete the level without being noticed) and "The Trap Is Set" (for obtaining three secrets while avoiding the lasers). Unfortunately there's no way to get the last secret in stealth.
If you don't care about achievements/trophies, but do want all pickups, you can skip the next section and continue with secret #3, here.
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