Run/roll straight along the middle of the bridge, between the two sides of the huge mechanism. Step on the pressure pad on the left to raise a set of wooden ledges on the right.
Move onto the ledge. As you do this, Chompy will approach, pause between the gears and let out a roar. Pull the gold handle. . .
. . . to activate the giant grinder, spraying Lara with nasty raw fish. A moment later, the exit opens. Run through to end the level and unlock the "Instant Sushi" achievement/trophy.
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