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DOOM 3 Hints
How can I open the Power Routing / Control door in the Service Tunnels?
1 of 4: Clicking on its panel, you'll learn that you need the PDA clearance of either the Trans ENGR Team or James Holiday.
2 of 4: Fortunately for you, James is on permanent holiday in a small room that's almost exactly opposite the door you're trying to open.
3 of 4: Save your game before you pick up his PDA, though, since doing so will trigger the appearance of your very first chainsaw-wielding zombie.
4 of 4: Blast that zombie fast and get his chainsaw, then use it to quickly saw up all the other zombies that appear. Now *that's* a good old-fashioned DOOM slaughterfest!
