خلاصه داستان : موجودات تشنه به خون در انتظار گروهی از غواصان هستند که در یک شبکه غار زیر آب به دام می افتند.

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.