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Half-Life 2: Episode One Hints
Section 2: Major Antlion and Zombie Battles (ep1_c17_00a)
1 of 13: Finish climbing the stairs and then move along until you come to a corridor leading to a large three-level parking garage.
2 of 13: On the other side of the fence to your left are several zombines and antlions.
3 of 13: Once the other side is clear except for an antlion or two, go around and enter the main parking garage area to find that it has three spawn-holes that antlions constantly swarm out of.
5 of 13: Past the big wheel-opened door, go through a small side doorway marked with an EXIT sign.
6 of 13: Go down a stairwell until you reach another side doorway. (If you continue to the bottom, you'll only find a zombie torso and a supply crate.)
7 of 13: When you reach the dimly lit waterlogged area with the two "fence rooms" in it, be ready for a combined zombie/zombine attack.
12 of 13: A really big zombie attack that includes fast zombies will happen during the long wait for the elevator to arrive. Below is the best strategy I could come up with for this situation.