When you enter the room with the missiles and conveyor belt, drop down to the floor, taking care to avoid the motion sensors crisscrossing the floor. You don't have to use the ladder on the left side of the ledge, but it's a good way to make sure you don't accidentally drop down into one of the sensors.
Or, if you want an extra kill, shoot the gun turret in the corner. Tripping the motion sensors will then set off an annoying alarm but won't hurt Lara.
In the dark area to the left of the conveyor belt, you'll find a small medi pack.
If you haven't destroyed the gun turret, be sure to jump carefully over the sensors to reach the computer in the corner below the turret.
Use the CODE CLEARANCE DISK in this computer to raise the missiles off the conveyor.
Then turn around, jump over the sensor, and climb onto the ledge with the moving hook.
Draw pistols and jump in place while shooting to smash the purplish vent ahead. Behind it is SECRET #2.
BUG NOTE: Be sure to shoot the vent before climbing into the duct. It is possible to pass through the vent without breaking it first, but some players have found themselves stuck in the duct unable to break the vent from the other side.
Follow the duct to the left.
Climb down a ladder...
...to find a save/power-up crystal. Then return up the ladder and through the duct the way you came.
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