Use the switch on the side of the metal block near the first fan to open a trapdoor just beyond it.

A brief cutaway shows the trapdoor opening.

You can't get to the trapdoor by going under the fan, so climb onto the block above the switch and pull up into the blue crawlspace.

Quickly crawl forward then left, into the corner where Lara can stand...

...and kill 2 rats. Use the switch on the wall here to turn off two of the big fans.

Pick up the small medi pack. Then crawl away from the switch to the end of the passageway.

Turn around, and safety drop to the floor.

Lara lands in a doorway. The stairs leading back up to the computer room are directly behind her, and there's a room with a blue pillar ahead, but you don't need to go there. Instead turn right and climb into the hallway with the round "Euro Chunnel Ltd." sign on the wall.

Continue to one of the fans you just turned off. Climb onto the ledge to the right of the fan and shoot the vent with horizontal slats.

Enter the passageway behind. Shoot the vent at the end...

...and slide down to get some grenades. The spinning fan prevents you from going to the left.

So turn around and take a standing jump back up the slope into the passageway and go back around to the right, to the fan that's not running.

Move past the fan, walk to the edge...

...turn around, and slide backwards down the slope, grabbing the edge of the trapdoor you opened earlier. Drop to the wooden walkway below.

NOTE: If you missed the switch that opens the trapdoor, it's easy to get back there. Stand on top of the trapdoor facing the two inactive fans. Jump up the slope toward the one on the right, and you'll see the switch on the side of the metal block just beyond the fan. This is the same block you climbed on earlier to get into the blue crawlspace. Pull the switch, then return to the trapdoor and slide down.

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