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DOOM 3 Hints
How can I get from the Underground Garage to the Old Comm Center?
1 of 7: Talk to Mark Ryan about it (and pick up his pistol from a crate next to him to get more bullets).
2 of 7: When you're ready, click on the "Cycle Airlock" panel.
3 of 7: When the airlock is pressurized, it'll open and allow you to walk inside it.
4 of 7: Press the "Cycle Airlock" panel inside the airlock to get it to open up to the airless Martian surface.
5 of 7: NOTE: Your suit's limited oxygen supply is shown as a bar and a percentage in the lower left part of the screen, just to the right of your armor and health readout.
6 of 7: Run across the outdoor bridge to the other airlock and get inside before your oxygen runs out.
7 of 7: EXTRA: Right after you exit to the surface from the garage's airlock, you could turn right and go around a corner to find a small stash of stuff, including more oxygen.
