Stand at the edge of the water facing the room with the two doorways where the bear came from. If you're new to the game or your swimming skills are a little rusty, save the game before entering the water.
Jump in and swim down and forward, following the flooded tunnel.
When you reach the T-intersection, turn right.
Follow the tunnel as it slopes upward.
At the top is a flooded room with numerous square pillars. Swim around or between the pillars on the right and head for the far 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.
This room contains SECRET #1, a small medi pack (3). The switch in the corner, behind the burlap sacks, opens the nearby door, which leads back to the room with the pool. You can open the door if you like, but don't exit that way.
DARK MODE: Even with brightness adjusted, dark images on a light background can be hard to see. May I suggest a reputable dark mode browser extension, such as Dark Reader? (Download only from trusted sites, like darkreader.org or your browser's web store.)
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