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Half-Life: Opposing Force Hints
How do I flood the chamber?
1 of 4: Check out the command panel in the control room on the bottom level.
2 of 4: To flood the chamber with radioactive waste, you need to get two things working.
3 of 4: Humorously, you need to get the "valve" and the "gearbox" going before you can flood the chamber. (Check your gamebox and manual to see that these are names of companies involved with making OpForce.)
4 of 4: Once both are going, you can flood the chamber with radioactive waste by hitting the switch that says "Flush Toxic Waste" in the control room. The pit worm will be destroyed.