Aura Satz’s inventive documentary celebrates the emergency sirens of today and those that will be needed in the future. A relic of World War II and Cold War infrastructure, today the siren can be read as a warning sign, a crisis management tool, and an emblem of climate collapse. Sonic collage, design history, and thought experiment in equal measure, the film considers the siren as a cipher for contemporary ideas of emergency and preparedness. It features music by more than 20 contemporary musicians, ranging from harp melodies to the rumbling of the Earth’s core, and footage of places as varied as the Fukushima Daiichi nuclear power plant and elements of the U.S. emergency signal system.