"From the point where the bomb happens, the whole nature of the movie changes. In the first half of the movie, I hope, you have a very full soundtrack. You have all the soundtrack of TV broadcasts and radio broadcasts, the sound of birdsong in the country, the sound of musical things happening, the sound of traffic and city noises. And from the moment that the bomb drops you don't have anything. You don't even have the teletype, all these things, they just type out in silence, and all you hear is wind. [...] You hear voices of people screaming, coughing or whatever. You hear wind, you hear no birds. [...] It's gone. That world is gone."