In the wake of tragedy, LBPD training officer Traci Harmon takes on new trainee, Alex Diaz who on day one is already learning the job is harder than he imagined.
With the suspects still at large and conditions worsening underground, first responders race against the clock to reach the trapped victims, while the investigation into the assailants comes into focus.
Following the subway tunnel collapse, Ruzek and Kidd treat injured passengers and track down the missing offender.
