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Pit Worm's Nest
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Exit the sewage area.
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Use the red lever to open the door.
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Climb the ladder.
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Enter the waste processing area 3.
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The pit worm is blocking your way. It can shoot a laser from its eye. You can hide behind any solid object and it can't hit you. Shoot its eye to stun the creature temporarily.
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Run to the right side. You have to activate a machine to kill the creature.
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Go down here.
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Enter a vent below the destroyed stairs.
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The controls for the toxic waste are in here. But you need to activate the valve and the gearbox first.
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Go through door with number 3.
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Go up a ladder.
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Press the lever to the steam vent.
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Go back and through the door with number 2.
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The dead soldiers will show you the way.
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Climb up the boxes to reach the other side.
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Jump over the green goo.
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Use the lift.
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A few aliens are in this room.
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Press the red button to activate the crusher.
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The crusher will reveal a vent grate once it destroys all the trash.
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Drop down the vent.
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Break through here.
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Cross the path.
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Press the red button to activate the gearbox pump.
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Go back to the place where you dropped down before. The water level will begin to rise. Just wait until you can exit through the vent above.
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Time to get back up.
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Use the barnacle to pull yourself to the pressure valve.
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Use the valve.
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Now you are ready to press the red button that will flush the toxic waste.
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The creature will die violently.
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Once the thing is dead press the bridge control button.
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Cross over the bridge that just extended before you.
More Half-Life: Opposing Force Walkthroughs
This Half-Life: Opposing Force walkthrough is divided into 12 total pages.