City of Vilcabamba - Flooded Tunnels - Secret #2

After obtaining secret #1 (as shown in the previous section), return to the open trapdoor and jump into the water.

Swim down and forward, away from the trapdoor, toward the diagonally opposite (far left) corner of the flooded room.

On the back side of this square pillar, you'll find a second lever.

Pull it...

...to open a door elsewhere.

If Lara's air/breath meter (normally displayed at the top left corner of the screen but not visible here in Photo Mode) is less than half full, return to the open trapdoor above the first lever to breathe. Otherwise, after pulling the second lever, swim between the pillars on the left and then down into the wide tunnel you came through before.

Follow this tunnel forward and down.

At the bottom on the left is the tunnel leading up to the pool. Unless Lara is about to drown, ignore it and continue straight ahead, following the tunnel as it slopes upward and then turns left.

Here the tunnel is lined with blue tiles. Follow it to the end.

Surface in a room containing a row of Mesoamerican serpent statues. Climb out of the water near them to unlock the "Why Did It Have To Be Snakes?" achievement/trophy.

Then turn around and head for the far right corner and the door you opened with the second lever.

Inside is a roughly excavated room containing magnum clips (4) and a small medi pack (5). This is SECRET #2.

There's no other way out, so return to the pool and swim down the tunnel, right at the bend, and right again at the next intersection. Follow that tunnel up to the first pool, near where you killed the bear, and climb out of the water.

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