Laura, Rich and Jackson try to use the submersible device they built to investigate the spawning site. But when Rich and Laura begin to descend, they experience technical difficulties that endanger their lives. Elsewhere, Miles does volunteer work at an aquarium.

After resurfacing from their trip to the ocean floor, Laura and Rich discover that their boat has disappeared. Meanwhile, Miles becomes ill in class and Savannah thinks that Nimrod may have something to do with it.