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Half-Life: Opposing Force Hints
Where do I go in the tram tunnels?
1 of 4: Have you explored thoroughly in the area you're in?
2 of 4: There's a hole in one of the walls you should examine more closely.
3 of 4: It has a large pipe behind it with a big hole in it.
4 of 4: Jump into the pipe through the hole and follow it along.
