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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.

Director : Bruce Hunt

Writer : Tegan West, Michael Steinberg

Cast

Cole Hauser

Lena Headey

Morris Chestnut

Eddie Cibrian

Piper Perabo

Daniel Dae Kim