In a remote Florida lake, a cave collapses, trapping Doc Ford and two of his friends. Ford manages to escape and surfaces to find help-but two ex-cons are waiting for him. They're intent on diving to the bottom of the deep lake and finding the remains of a legendary plane, supposedly loaded with gold. Ford's expertise is just what they need. And if he doesn't help, Ford and his friends are dead in the water.

The Red Citrus Trailer Park is inhabited mostly by illegal laborers. But the steroid-powered park manager and his grotesquely muscular girlfriend want to sell the park for some easy money-and they'll do whatever it takes to drive the residents out. Their problem is a young girl who the laborers believe talks to God. When the girl witnesses the manager dumping a corpse into a lake, he knows that she has to be silence permanently.

The girl's only hope for survival: marine biologist Doc Ford, who must search through an underground nation, trek through wildlife, and defeat an assortment of bad...