Volcanologist Maurice Krafft believed that "people are much more curious about hell than about paradise." Krafft and his wife Katia certainly were: the French scientists shared a lifelong fascination with volcanoes that took them all over the world to film eruptions until a hot ash flow in Japan claimed their lives in 1991. In this National Geographic special, made two years before their death, the Kraffts' breathtaking films and photographs allow us to share this fascination from the safe distance of our living rooms.