Completely agreed....
Being rescued by an army of mutant ants (with weapons) would have been more believable.
No it wouldn't, that would be far less likely.
Why?????
So what your saying is, when surrounded by flesh eating zombies, finding a magical hatch just at the very last second of survival, convieniently situated above your head....... Is far more believable than being rescued by an army of mutant Ants with sawn-off shotguns selotaped to their front legs. ????
So up until that point you had been entirely convinced in the army of zombies plotline, but the crawling into a tank and closing the hatch behind you made you scream "I give up, this is soooo unbelievable!!"
Yes.