Louvre Storm Drains - Valve-Control Hub to Huge Fan
After making your way through the sewers and locating the VALVE-CONTROL HUB, then climbing up to the middle level, as shown in the previous section, follow the curved walkway around the edge of the room. Use the switch...
...to shut off a huge fan elsewhere.
There's some Desert ranger ammo (3) and a valve on the other side of the room. Lara still isn't strong enough to use the valve, but you can walk across the black-and-yellow striped beam, through the falling water, and around to the right to get the ammo. Then return to the vertical pipe.
Stand with Lara's back to the wall and sidestep toward the pipe. Press Action to grab on...
...and climb back down to the lower level.
Exit the hub through the tunnel opposite the one where you entered (i.e., the one with the large pipe running along the left wall). Kill that rat (4) now if you didn't do so before.
Climb the short ladder ahead on the right to reach the fan you just turned off. (There's also a chute a little farther along the tunnel, but it's too steep to climb.)
Rotate the huge fan to gain an upper-body strength upgrade. Now that Lara is buffed, you'll be able to turn all these valves you've been ignoring.
Crawl under the blades and pick up V-packer shells (4).
Continue through the duct to another valve.
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