Once flowing through nearly every developed city in the world, rivers provided the infrastructure upon which modern metropolises were built. Why did they disappear and how? Could we see them again? In this adventurous and revelatory look into the disappearance and recent resurfacing of these historic waterways, Lost Rivers leads us down the drain into vast underground museums of urban development. Guiding us through the hidden river networks of London, Brescia (Italy), Montreal and Toronto, intrepid groups of subterranean explorers known as “drainers” reveal the buried waterways that house the secrets of each city’s past. The film also explores recent initiatives to resurface and revitalize forgotten rivers in Yonkers, N.Y. and Seoul, Korea. Written and directed by Caroline Bâcle. Produced by Katarina Soukup, Catbird Productions.