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ok, I'll help you guys out,
go back to the chasm area with all the pipes and stuff,
make the water flow like this:
(water is the solid lines, not the dots)
(this is the area the water comes down from)
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(over here you have to shut down the last gate to divert the flow into that tunnel)
after that, go back to the area with the valves and gears and turn the thingy and that should be it. 
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