[The screeching only increases in volume, starting to blast from every available speaker in the dome. White noise, rumbling silence with the faintest voices blended into it. People's voices, inaudibly chattering overlapped by piano, a woman's voice reciting a radio broadcast with the quality of a 1940s record. After a period of five to ten minutes it's all replaced with blaring beeps, tightly following one another until they gradually space out.
And then silence returns, but it's almost as if you could hear someone at the microphone(?) clear their throat.]