After rounding the edge of the lake to the north side, enter the room with the green stone doorway.
There are 2 bats lurking inside. Shoot them.
Then drop through the opening in the floor below the lit torch, at the back (north) side of the room.
NOTE: The other openings will either drop Lara onto a series ramps and deposit her in a pool at the bottom or break her bones outright. If you end up in the pool, either reload an earlier save or follow the underwater passage back to the lake and try again. There are a few pickups in the pools below the side openings, but we'll get them on the way out.
Hop down to the lowest step and face the striped pole. Step off the edge and slide down the slope (don't jump)...
...to land at the base of the longer pole.
Hold Action to grab the pole. Climb up until Lara is roughly level with the heads of the Thoth carvings on the wall.
Turn so the carvings are on Lara's right and her back is toward the base of the second pole.
Then press Jump to backflip and land there.
Climb the second pole almost to the top.
Turn so the first pole is ahead and the square ledge is behind Lara.
Then press Jump to backflip off the pole and land there.
Climb into the raised crawlspace.
Follow it to the end and drop down.
Continue through a short passageway to a small room with a hieroglyph-carved ledge and two golden windows.
Pull the chain.
A cutscene shows the gate back at the building in the middle of the SACRED LAKE opening, releasing a pair of crocodiles.
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