After tripping the snowballs on the slope alongside the pool and jumping into the water, climb out and head for the rock formation near the small opening where you killed the leopards. Go around behind it.
Then climb on top.
Turn so the pool is on Lara's left and take a running jump to the snow-covered ledge opposite. Then follow the ledge around to the breakaway tiles with spikes below.
Run across the tiles to the ladder on the wall ahead, holding Action to grab the ladder as the floor falls away below.
Climb almost to the top of the ladder and backflip. . .
. . . to land on the ledge behind. Turn around, jump to the top of the slope and pull the switch to raise the cage ahead.
Slide down the ramp, jump onto the ledge with the cage and take the TIBETAN MASK (1/2).
Doing this causes the trapdoor at the bottom of the pool to open and the water to drain away.
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