It chronicles the EF5 tornado that traveled over 17 miles and left mass devastation within its 45 minute reign of terror. Watch interviews of storm chasers, meteorologists and emergency management who battled to save lives during that fateful day with exclusive footage of now condemned areas. This special provides one of the most comprehensive collections of user-generated footage of the Oklahoma tornado to date and conducts original interviews with those who recorded those first-hand accounts. The documentary, via in-depth interviews with scientists and the latest data, also helps answer the "why" behind this devastating event including: How did the tornado form? How was this different from a similar EF5 tornado that hit in the same area in 1999? What role did the warning system have in saving lives? Have warning systems progressed to the point where they are more effective?