The fact is that the Listeners are trying to w…

The fact is that the Listeners are trying to work out precisely what it was that the Creator said when He made the universe.
  The theory is quite straightforward.
  Clearly, nothing that the Creator makes could ever be destroyed, which means that the echoes of those first syllables must still be around somewhere, bouncing and rebounding off all the matter in the cosmos but still audible to a really good listener.