The 13th Floor - Exploding Ducts - Secret #2
After collecting the HIGH-LEVEL ACESS CARD and ACCESS CODE DISK, as shown in the previous section, you return to the 13th FLOOR. Exit the elevator and turn right.
If you didn't kill the sleeping guard earlier, you'll need to walk past the glassed-in office now. (Once you reach the Fizwiz Cola machine, you can run again.)
Use the ACCESS CODE DISK in the console at the end of the corridor to open the grate above.
Cutscene: A series of explosions begins in a vertical shaft with a pole. Even Zip thinks this is weird. Notice the ledge about halfway down the shaft. That's where you're headed next.
Climb into the duct and move to the left, away from the explosions.
Face the climbing pole squarely, but don't stand too close or Lara will catch fire. Now observe the pattern: After the blast from the first vent, just ahead on the left, there are six more blasts moving downward from vent to vent. Then the cycle repeats.
Wait for the blast from the first vent. That's one. Count off three more blasts. Then run forward off the edge (don't jump) and hold Action to grab the pole.
Continue holding Action to hang on and press Down to slide about halfway down the shaft.
When Lara is between the second and third vents on the wall of the shaft, press Jump to backflip into the opening behind her. Do not hesitate on the pole or Lara will catch fire when the explosions reach her.
Turn around to find a golden rose (16) (189/239) (SECRET #2, 29/36).
Once you have the secret, move toward the pole, but don't get too close. Wait for the explosions to move all the way to the bottom of the shaft.
Then when they cycle back to the top, run off the ledge...
...and crawl into the low opening on the left.
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