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Half-Life: Opposing Force Hints
How do I get past the locked elevator door?
1 of 7: There are no nearby vents this time.
2 of 7: You need to break the door down.
3 of 7: You don't have anything that could cut through metal...
4 of 7: ..but an engineer does.
5 of 7: You need to find some nearby soldiers that will help you. One is an engineer.
6 of 7: Once you have added the soldiers to your squad, guide them towards the elevator door. When the engineer gets close enough, he will catch on and cut open the door.
7 of 7: Bring both of the soldiers with you into the elevator. Their help will pay off.
