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First of all. What kind of zombies would even have access to their higher function brain sectors? For if they do, that's not a zombie. That either a ghoul or vampire. Possibly a Reanimated Corpse in some circles.
Second, why would a zombie know about the bunker in first place? Did they build it with you while they were still alive? Did know about the plan before they turned? Why did you allow such need to know info leak so easily?
Finally, even if they knew where it was. You should have already be in inside of it, to make sure the safety guards are still in place to where they can't even find it, let alone attempt to enter it.