Anxious to explore the mysterious hidden world under metropolitan Berlin, an international group of four urban explorers hires a local guide, Kris, who leads them into the maze of escape tunnels and subterranean fortifications under the city. When their guide has a bad fall, two of the girls in the group frantically set off to seek help while Denis, the young American, stays behind. Armin, a former East German border guard suddenly appears from nowhere. Out of sheer desperation, Denis allows Armin to lead them and their unconscious guide to safety and it is at this moment that Denis realizes he has just made the biggest mistake of his life!
| Writing | Martin Thau | Writer |
| Directing | Andy Fetscher | Director |
| Art | Nobel Nobielski | Production Design |
| Editing | Andy Fetscher | Editor |
| Sound | Steven Schwalbe | Music |
| Sound | Robert Henke | Music |
| Production | Monika Mikkelsen | Casting |
| Production | Oliver Thau | Producer |
| Costume & Make-Up | Dorota Budna | Costume Design |
| Art | Patricia Walczak | Property Master |
| Editing | Carsten Eder | Assistant Editor |
| Lighting | Matthias Pilz | Electrician |
| Sound | Nigel Holland | Supervising Sound Editor |
| Camera | Andy Fetscher | Director of Photography |
| Lighting | Clemens Baumeister | Electrician |
| Costume & Make-Up | Alice Möwius | Assistant Costume Designer |
| Visual Effects | Janosch Benz | Visual Effects Supervisor |
| Crew | Waldemar Pokromski | Makeup Effects |
| Art | Agata Uchman | Art Direction |
| Crew | Jens Döldissen | Special Effects |
| Lighting | Lars Petersen | Gaffer |
| Costume & Make-Up | Beata Rółkowska | Makeup Department Head |
| Sound | Joo Fürst | Foley |
| Sound | Christian Bischoff | Sound Re-Recording Mixer |
| Lighting | Johannes Höber | Electrician |
| Sound | Annette Prey | Dialogue Editor |
| Camera | Laura Deschner | Still Photographer |
| Lighting | Tarek El Barbari | Electrician |