The London experiment consisted of herding workers, children and bomb-shocked neurotics into underground vaults and there subjecting them to an 'artificial blitz bombing.'
Sound effects used in the test were recordings made during one of London's worst air raids last year, amplified to simulate the real thing. An Associated Press writer who witnessed the experiment reported:
"The sounds swelled in the dark vault. The guns kept banging. Then big bombs burst. The guns kept up. More bombs. Then the crackle of flames. Next clanging fire engines added their noise, the other sounds continuing."
According to the reporter, the subjects stood the test very well: 'No one was crying out. A flashlight swung around the room, revealing drawn faces and frightened eyes. But no one was swooning. The experimenters stepped up the amplification.'
The British psychologists responsible for the experiment were reported delighted with the results. They said it proved their theory that whole populations could be exposed to 'artificial blitzkriegs' and thus rendered immune to fear during air raids.