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The Orange Box: Half-Life 2: Episode Two Hints
How can I get into the tunnel?
1 of 7: Before you worry about that, notice where Alyx is.
2 of 7: After she dropped down from the train car, she ran over to where she could get a better view of the citadel's remains.
3 of 7: Walk over there and wait as a portal storm rips through the area.
4 of 7: It won't hurt you or Alyx, but it will cause quite a bit of damage to nearby structures.
5 of 7: The most obvious thing it does is collapse the nearby train bridge.
6 of 7: However, it also dislodged two large rocks near the tunnel entrance.
7 of 7: They bashed the tunnel's fencing down, and you can now just walk over the fencing (or throw it out of the way with the gravity gun).
