Jack (Cole Hauser Cole Hauser) and Taylor (Edith Bian Cole Hauser) are two cave experts who love to explore and, at the invitation of biologists Nicholas (Marcel Iures) and Dr. Janice (Lena Headey), come to the Romanian Carpathian Mountains with an experienced team to explore the huge caves and ancient churches they stumble upon here. Briggs (Rick Ravanello), an explorer, was the first to enter the water to survey, but lost contact with his teammates soon after the communication. To be on the safe side, Jack and Taylor decided to set out in search. Along the way, they saw all kinds of strange creatures they had never seen before. it turned out that there was a completely independent paleontological system in this closed cave. But these discoveries did not surprise them much. The explorers were trapped in the cave, and the threat from unknown creatures was gradually pressing on them.
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