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!

Welcome to the captivating world of urban exploration, an international subculture of fearless thrill-seekers who lurk beneath city streets and trespass into long-abandoned buildings, defiantly searching for unseen treasures of modern civilization. Documentary filmmaker Melody Gilbert follows Max Action, Slim Jim, Katwoman and Turobzutek as they infiltrate aging lunatic asylums, government sites, faded tourist attractions, sewers, drains, and even the forbidden Catacombs in Paris. Many explore armed with only a camera, often snapping astonishingly beautiful photos.