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Half-Life Hints
How do I get into the control room for Silo D?
1 of 5: Well, the door is locked and the glass is bulletproof, so there is no way in currently.
2 of 5: You probably saw a zombie grab a security guard and drag him into the air duct.
3 of 5: The air duct is the only other way into the control center.
4 of 5: You need to find a way into the air duct.
5 of 5: Unfortunately, that is the main goal of the level, so there are no shortcuts.
