Shoot the switch so the green side faces you and the huge gear on the left is turning clockwise.
Jump onto the block in the pool and use your torch to light one of the gas vents on the gear.
Wait for the gear to turn, lighting the gas vent in the corner between the two gears.
Then shoot the switch again to change the direction of both gears. Now the gear on the right moves clockwise, carrying the fire from the vent in the corner to the gas vent on the right.
Mission accomplished!
The water in the pool begins to boil, raising a pillar so you can climb (carefully) onto the ledge above.
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