The show has a total of eight episodes, describing the critical seven days of panic after the nuclear disaster in Japan, and from the point of view of the government, enterprises, and people at the scene of adventures, and through rigorous data collection, the real story of the incident is restored. And try to answer a question: "what on earth happened that day?" At 02:46 on March 11, 2011, a magnitude 9 earthquake struck Liyuan City, Miyagi Prefecture, Japan, with a maximum magnitude of 7, which was badly hit within 130km from the Sanriku coast. Several Japanese islands were in ruins. An hour later, a 15-meter-high tsunami swept up in the sea and engulfed the Fukushima nuclear power plant, but that was only the beginning of the nightmare. The earthquake caused the cooling system of the nuclear power plant to fail, which was dangerous and the situation was completely out of control.