The facility is designed in sort of a figure 8 so that there are 2 to 3 ways in/out each area. It's also designed so that the sole survivor can get around to each point of entry fairly quickly to hold off the relentless horde of zombehs. Most of the weapons and healing stations will be in a single armory room, so you need to conserve your ammo and fall back and play conservatively. So yeah, shouldn't be too much longer now...
