Stand at the edge of the water facing the stable with the two doorways and the wooden trough. Jump into the water. . .
. . . and swim forward and down along the tunnel. At the bottom, where it comes to a T, swim to the right.
Follow the tunnel as it slopes upward. At the top is a flooded room with numerous square pillars. Swim between the pillars on the right. . .
. . . and head for the back right corner. Find the lever on the wall below the carved stone faces. Pull it to open a trapdoor above. (To pull the lever, swim close, turn Lara to face it and press Action.)
Swim up to the open trapdoor and climb out of the water. Inside is secret #1.
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