The film was shot in black and white, in a dramatic, theatrical style with claustrophobic close-ups, sharp shadows and ponderous silences between several characters. Except for radio background during a scene at an Air Force base in Alaska, there is no original music score (only the electronic sound effects act as the film's main and end title music). With few exceptions, the action takes place largely in the White House underground bunker, the Pentagon war conference room, the SAC war room, and a single bomber cockpit (a "Vindicator bomber"). Shots of normal daily life are seen only after the title opening credits and in the final scene depicting an ordinary New York City day, its residents entirely unsuspecting of their imminent destruction, each scene ending with a freeze-frame shot at the moment of impact.