🚨 On This Day — November 9, 1979 Alarms blared deep inside Cheyenne Mountain. NORAD’s computers suddenly showed what no one ever wanted to see — a massive Soviet nuclear strike inbound toward the United States. Across the nation, radar screens lit up. Crews prepared to respond. For tense minutes, the world hung on the edge of Armageddon… until analysts discovered the truth — a training tape simulating an attack had been loaded into the live system. One mistake nearly started World War III. But

#OnThisDay 1979: 'Tonight' reported on the potential of a computer in every home. "For the first time we upgrade the intellectual capability of the human race to a level undreamed of before." | BBC Archive