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Half-Life 2: Episode One Hints
Second Control Room
1 of 11: At the end of the corridor, look to the right to find a wall panel.
2 of 11: Use the gravity gun to blast the panel loose, then carefully crouch-jump into the gap and inch forward so you can see what's going on in the shaft beyond.
3 of 11: You need to go down the shaft toward the orb-firing gadgets and duck through the doorway that's just to the left of them.
4 of 11: Go up the slanty glass machine covering, then jump up onto the slightly higher walkway on the right.
5 of 11: Move along until you reach another panel covering that you can blow off to create a crouch-jumpable hole, but don't go through too fast -- soldiers are waiting for you on the other side.
11 of 11: As soon as the machine's in place, a door in the back corner of the room will open up, thereby starting you on the journey to the third control room.