Far below them, they could hear a steady purring sound that could only be some sort of machinery running, and large machines, at that. Underneath the steady whir was another sound, one as much felt as it was heard: a sort of monstrous roar, like the rumble of giants arguing. This was the sound of water, Jamie knew, as it forced its way through some part of the dam to emerge on the other side. The combination of sounds was impressive, clearly announcing the attendance of might of one form or anot