An explosion in a San Bruno, California neighborhood destroys homes and kills residents. An experienced captain and crew sail their ship into the path of Hurricane Sandy, leaving many asking why? A building full of 3,500 garment workers suddenly collapses and traps many of them inside. A warehouse full of fireworks goes off without any warning, causing evacuations and deaths. And trains arriving at the same place at the same time end up colliding… was it an engineering failure or human error?