I look at the various ruined buildings, and especially these strange wells.
They seem very deep. Why have such big wells when there's a river nearby? I lit a match, but couldn't see any reflection from water. And from the way the match flame flickers down, there's a steady current of air, downward into the deep shaft. And as I lean over I can hear a steady "thud, thud, thud" like the sound of distant machinery. And wherever there's a well there's always a tower nearby on a hill. I wonder why?
Then suddenly I hear a scream from the river!