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DOOM 3 Hints
How do I get back into the security checkpoint room?
1 of 7: The door you used earlier to get from the checkpoint to the Underground Junction is still firmly locked.
2 of 7: Fortunately, there's another door that leads into the security area, and it's open.
3 of 7: It's just a little ways back along the catwalk. It was locked before, but not anymore.
4 of 7: Once you're through it, use the security control panel to unlock the other door. You can now go back through the Underground Junction and into the other half of the security area through that door.
5 of 7: Also, while you're at it, why not use the same security panel to unlock the other security locker that's near the elevator?
6 of 7: To do that, click on "Mars City Sublevel Access" and then "Entrance Lockers" and then "Locker 1." Now you can get a hot new machine gun on your way back to the elevator!
7 of 7: One last thing you can do if you like is use the same "Mars City Sublevel Access" menu to unlock the door to the Maintenance storage area that's on the little west platform in the Underground Junction. Unfortunately, to get to that room and back, you'll have to do the tightrope-walking stunt again (see link below if you don't know what I mean).
