This film was produced by the U.S. Army in 1949 to acquaint the public with the consequences of a nuclear attack on a U.S. city and the response in the aftermath.
This film is blurry and has odd colour because it was shot in the Cinecolor process, which ran two stacked strips of film through the camera simultaneously, the top one an orthochromatic emulsion dyed red and the bottom panchromatic stock. These were processed separately and printed on film with tinted black and white emulsions which added to produce the (limited range) colour. This was easier to use and less expensive than three-strip Technicolor, but the results were less impressive, as it apparent here. Cinecolor was used between 1932 and 1955.