To get down the pole, wait for 4 loud explosions then 4 smaller ones. After the 4th large explosion, run and grab the pole. Slide down about half-way and [jump] doing a back-flip to a crawlway and A SECRET ROSE. Jump down to the bottom of the vent with the pole, and crawl down the access with the overhead pipes.
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Enter a large storage room area from the upper catwalk. [Walk] across the catwalk to avoid attention. Zip cuts in on the headset and explains there's an armored security guard with laser weapons down below. Go to the other side of the room, and walk around the corner to a storeroom on the right. Search the shelves and grab the medpack and a cloth. [Walk] across the upper catwalk on the other side and continue down the stairs. The armored guard is to the right with his back facing you.
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Make sure not to attract attention. Continue walking across the room to the other side. There are 2 recessed lit doorways. The 2nd door has a card reader. Using your security access card, open the door and enter the lab room with the bugs in the glass cages *yuck*. The fridge to the left does not open. To the right are 2 stainless steel lockers. As soon as you search the lockers, the glass cages shatter and the bugs start to scatter over the floor. Use a medpack as they nibble at Lara's feet.
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Take the 2 bottles of Chloroform and 2 medpacks. Return to the main area. SAVE GAME (just in case). [Walk] up to the armored guard from behind and [combine] the cloth with one of the bottles of chloroform. [Use] the soaked cloth on the guard to subdue him. Use your access card and swipe the reader on the right in the archway. Enter the next lab room. An armored guard greets you. Take him out with a sniper headshot (only vulnerable spot). Grab the Iris Lab Access Disc on the floor.
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[Use] the disc in the console and enter the laser testing room. SAVE GAME. Approach the first window and observe the guards. Stay far enough away that the guards don't see you. The armored guard is testing the laser. The other guard is walking the hallways. Learn his pattern. As he walks away, walk to the first recessed doorway on the left. Wait in the doorway for the guard to return. He will spot you. Take him down with a quick sniper hit before he activates the turret gun security.
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Run down the hall and to the right, taking a little damage if the turret gun security is active. Enter the next room. There's an orange guard working the console on the right. Draw your weapon, but don't kill him. Just point your rifle at him and he says "Don't shoot". The action sequence shows Lara convincing the worker to use his access card in one reader while Lara uses her card in another reader, at the same time. This opens the door to the iris security chamber and the upper control room.
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Climb the stairs at the end of the hall. Lara's camera goes passive. We're almost there. You can see the iris from the upper control room. On the right side of the control room is a wall swing switch. This switch is on a timer and stops the electrical field around the iris for 20 seconds. Once you pull the switch, Lara has to dart down 2 flights of stairs, run down a ramp, then up into the security chamber and grab the iris before the electrical field regenerates. Run out the other side of the room. LEVEL ENDS.
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