The location with the second grade breed of Little Ones ... Them zombos know their turf and tunnels and trolls; and it is unlikely that they did not smell Michael, Victor, and R2Da2 - especially not with the cologne Victor used in the place. So why didn't they follow this trail? Because they have more important stuff to deal with - feeding the babys ...
Just an assumption ...
But I ground this on the idea that the survivors really have no other lead remaining. What other location except for Cain Hospital do they really have in order to plan future actions against them zombies? I may be wrong, but I don't remember any other way than this dark tunnel of sinister pittyness ...
Best wishes!
Liam
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