Swim through the tunnel at the west end of the aqueduct and surface in a small cave.
Climb out of the water on the right (where Lara is standing in the screenshot above). Climb onto the rocks (on the right in this screenshot). Walk forward (with the pool on your left) until Lara won't walk farther.
Jump over the angled block and immediately jump again to land on the rocks ahead. Lara will slide down to a flat spot in the corner. Turn left and walk/slide down to the items on the rock ledge, secret #1.
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