The year is 2020 and the world faces the ultimate threat. Not nuclear war or a terrorist attack, but the eruption of a gigantic ‘supervolcano’ simmering beneath Yellowstone Park. Brilliant BBC documentary thriller. This powerful, reality-based thriller explores the environmental, political, economic and social impact of such a cataclysmic event. After witnessing the build-up and devastating climax, viewers are projected into the aftermath: a post-apocalyptic world. Local news feeds, diary footage, CCTV, family camcorder and real archive footage are simulated in gritty detail, while human drama overlays the factual scenario, shaping events into a compelling experience.