Day of the Dead

In a post-apocalyptic world overrun by zombies, a group of scientists and military personnel in an underground bunker in Florida engage in disturbing experiments on the undead, sparking tensions with the military. When the military discovers that their men have been used in these experiments, they banish the scientists to a zombie-infested cave system. But their refuge is short-lived, as zombies from above ground breach the bunker's defenses.