
In the last section we obtained the pistols and unlocked an achievement/trophy. Now, climb the ladder to get back on top of the plane.

Next, you're headed for the lever just to the left of the huge underwater fan in one corner of the pool. If Lara passes between the barrels on the bottom and the fan, whether she's swimming underwater or on the surface, she'll get sucked into the blades. The danger zone is outlined in the screenshot above.

So approach the lever from the left.

Pull it to open the small, square grate to the right of the fan.

To reach it, swim away from the fan and around the barrels, either along the bottom or on the surface.

Then hug the wall as you approach the grate. Yes, that's the Jade Dragon behind the fan, but don't try to reach it yet.

Follow the flooded passage to the end. There are several twists and turns but no side passages, so you can't get lost. Near the end, the tunnel slopes upward...

...into a tall, narrow room where you can surface and breathe.

On the wall below the tunnel where you just swam in, is a second lever. Pull it to open a trapdoor near the fan.

There's no timer, so take a moment to refill your air meter. Then swim back through the tunnel...

...retracing the path you took earlier.

Just before the end, where you came in, you'll see the trapdoor you just opened. Swim down through this opening then to the right.

Continue forward then upward...

...to find SECRET #1, the Jade Dragon (2), sitting behind the huge fan.

Roll and swim back through the tunnel the way you came.
NOTE: If Lara's air is running out, instead of swimming all the way back to the top of the tunnel, follow the passage to the right and surface in the big pool to breathe. Just be sure to turn left as you emerge from the tunnel and stay close to the wall so Lara doesn't get drawn into the fan. Then return through the long underwater passageway to the small room with the lever.
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