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Half-Life: Opposing Force Hints
How do I free the underwater scientist?
1 of 3: You need to activate a portal from the testing chamber underwater to the laboratory.
2 of 3: This is pretty straightforward. Locate the command console and find the big, yellow button. Push it to release the scientist.
3 of 3: After killing all the nearby pit-drones, of course. (You should find it easy to shoot them over the console with the handgun.)
