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Half-Life Hints
The vent shaft was just blown up!
1 of 5: It was blown up for a reason.
2 of 5: The Osprey helicopter has a great deal of soldiers in it. It will begin lowering them down on ropes into the vent access shaft.
3 of 5: You will want to move fast. There is a ladder on the wall.
4 of 5: Take it to the very bottom (or hop down via debris chunks) and quickly duck into the vent shaft. With any luck, you will sustain only minor injuries.
5 of 5: Don't even bother fighting the soldiers unless they have reached the bottom of the vent shaft. They are difficult targets to hit as they move downward.