What secrets lie beneath our feet? Berliner Unterwelten co-founder Dietmar Arnold takes us on a journey through Berlin’s underground, revealing how forgotten bunkers and escape tunnels bring history to life. More than just relics, these hidden spaces offer a powerful lesson on resilience, remembrance, and why confronting the past is essential for shaping a better future.From a student exchange in 1988 to founding Berliner Unterwelten, Dietmar shares the untold stories of Berlin’s subterranean world and its role in preserving historical truth. By making the past tangible, he challenges us to reflect on how history connects us—and why we must ensure that no one is ever forced to seek refuge underground again. Dietmar Arnold is the CEO and co-founder of Berliner Unterwelten, an organization dedicated to uncovering and preserving Berlin’s underground history. What began as a fascination sparked by a student exchange in 1988 evolved into a thriving initiative that sheds light on wartime shelters, Cold War escape routes, and the city’s hidden past. Through guided tours and educational programs, Dietmar makes history tangible, ensuring that these forgotten spaces serve as powerful reminders of resilience and the importance of remembrance. This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at https://www.ted.com/tedx