After a group of biologists discovers a huge network of unexplored caves in Romania and, believing it to be an undisturbed eco-system that has produced a new species, they hire the best American team of underwater cave explorers in the world. While exploring deeper into the underwater caves, a rockslide blocks their exit, and they soon discover a larger carnivorous creature has added them to its food chain.

• City Productions
• Cineblue Internationale Filmproduktionsgesellschaft
• Cole Hauser
• Lena Headey
• Morris Chestnut
• Eddie Cibrian
• Piper Perabo
• Daniel Dae Kim
• Kieran Darcy-Smith
• Rick Ravanello