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The Day Called 'X' is a dramatized CBS documentary film set in Portland, Oregon, in which the entire city is evacuated in anticipation of a nuclear air raid, after Soviet bombers had been detected by radar stations to the north; it details the activation of the city's civil defense protocols and leads up to the moment before the attack. The operations were run from the Kelly Butte Bunker, which was the emergency operations center at that time. It was filmed in September 1957 and aired December 8 of that year.