A full-scale mock air raid tests the nation's civil defense preparedness. 75 Key targets are hit by mock h-bomb raids, as the populace takes shelter. Estimates of civil defense effectiveness are secret except for New York City - where it is estimated over 4 million would have died in a real raid. Establishing shot - Outside the Civil Defense building in Washington, DC. MS - Inside the Washington nerve center, every phase of the attack if followed as if it were real. MS - Map of the United States and the lights indicate were the warnings were advised. CUS - Air Raid Siren. CUS - People traffic are directed to go down into the sub-way tunnel using it as a air raid shelter. CUS - At the Pentagon top defense figures are air lifted to secret control centers. MCUS - Helicopter leaving its helix-pad and becoming air born. MS - The streets of New York City are totally barren. MS - People of New York exiting the sub-way tunnel. MS - New York's street this time with traffic and people.