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.
Cole Hauser
Lena Headey
Morris Chestnut
Eddie Cibrian
Piper Perabo
Daniel Dae Kim
Kieran Darcy-Smith
Rick Ravanello
Marcel Iureș
Vlad Rădescu
Simon Kunz
David Kennedy
Alin Panc
Zoltan Butuc
Brian Steele