As the world's industrial growth resulted in the dangerous contamination of rivers, urban planners devised ways in which to route them underground. This documentary ushers viewers on a global exploration of these "lost" bodies of water, plunging beneath the surfaces of cities like Montreal, Brescia, Seoul, and Yonkers─showing how this phenomenon took shape the steps now being taken to improve environmental management. 72 min. Widescreen (Enhanced); Soundtrack: English; bonus footage; theatrical trailer.