This article considers artworks that recorded the construction of four mega dams in Ukraine, the Caucasus, Central Asia and Siberia between the 1930s and 1960s, which as exemplary hydroforming projects trailblazed the expansion of the socialist developmentalist model to the non-Russian territories of the Soviet Union. As centrepieces of the planned economy, mega dams performed as engines of the expansion of heavy industry, as infrastructural hubs for resource extraction, as drivers of social ...