There are about 25,000 underground tunnels in Berlin, two-thirds of which have been closed, and some places have been abandoned for 60 years. Today, these long-forgotten passages have become the secret places that many explorers yearn for, and for this reason they do not hesitate to disobey the orders of the authorities and sneak into the underground world full of unknown and dangerous. On this day, Dennis (Nick Eversman), Lucia (Nathalie Kelley) and other four young men and women from all over the world who are equally curious, sneaked into the underground passage under the guidance of guide Chris (Max Riemelt). There are many historical traces of the Nazis in World War II and the Cold War here. Soon, they were threatened by two vicious men. Even so, Dennis and his friends continued to move forward, and what awaited them would be an unimaginable horror journey... This film won the 201 Scream Festival Best Actor (Klaus Stiglmeier), Best Editing, Best Makeup and Best Photography four awards.