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Half-Life Hints
These air ducts lead nowhere.
1 of 7: After you escape the vent shaft that included rapelling soldiers, you will come to another vent shaft that has a functional fan.
2 of 7: This shaft has three different air ducts that you can enter, excluding the one you took to get into this shaft.
3 of 7: The highest one will take you around to various areas that you have already been to. There are two soldiers and one headcrab to deal with if you choose to explore this route. If you need ammunition, this is the way to go, as there are several places where you can exit the air duct and grab ammunition that is otherwise unreachable.
4 of 7: The middle air duct requires you to get below the fan. Remember to stay crouched when you enter this vent. You will be taken to an area with a few boxes of shotgun shells. Grab them if you need them.
5 of 7: The lowest air duct will take you to yet another vent shaft. This one is not as difficult. There are ladders that you can take up.
6 of 7: In the second air shaft, the highest vent does not lead anywhere and the middle one will drop you into the control room that you passed by when you started this level.
7 of 7: When you get to it, use the big red button to open the door that leads to the next game chapter.
