The Invisible River

Synopsis

An underground river flows through the Upper Rhine Valley, fed by Europe's largest groundwater reservoir, creating unique wetlands that support diverse ecosystems. Underwater cameraman and biology professor Serge Dumont captures this hidden world, showcasing rare species of fish and birds and their behaviors in unprecedented detail. The film highlights the critical importance of pure groundwater and the biodiversity it sustains, emphasizing the need for conservation efforts to protect these vital natural resources in the regions between the Black Forest and the Vosges.