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Half-Life 2 Hints
Where is this gate and how can I open it?
1 of 7: It's the gate that the last two sentry guns you took down were standing near.
2 of 7: You can see the gate through the windows of the upstairs security room that's just past the laser tripmine.
3 of 7: You can also open the gate from in that room.
4 of 7: Find the windows nearest the gate and look right beneath them.
5 of 7: You see that little control panel? Use it to open the gate.
6 of 7: Then go back downstairs and around to get to where the newly opened gate is, sending your antlions ahead of you to kill off the soldiers who come after you.
7 of 7: TIP: Before you go back down to the lower floor, get the supply crate in the security room plus all the supplies on the nearby upper walkway and inside the open cell.