
After defeating the cyborg and retrieving his KEY BIT, as shown in the previous section, you'll notice that draining the room also closed off the duct where you came in. You'll need to re-open it. Start by climbing back on top of the duct the way you did before. (Green arrows show the longer route, white arrows the shortcut.)

Grab the dangling rope...

...swing back over to the high duct...

...and return the switch to the up position to re-flood the room...

...and re-open the exit. (Remember to avoid the electrified floor afterwards.)

Again, take a running jump from the high duct, past the dangling rope, onto the lower duct.

Sidestep to the left or right so the rope is not directly behind Lara. Then hang from the top edge of the duct. Let go and quickly grab the lower edge.

Then pull up into the duct. Follow the duct to the end, hop down...

...and return through the crawlspace. The lasers that were blocking the doorway opposite the crawlspace are now deactivated, but do not rush forward.
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