There has been no rain for weeks and the hot weather has seen the pond all but disappear. Cupping ones ear to the surface of the steel cover it’s possible to hear subtle tones and water sounds, but with the falling level of water the music is on the verge of silence.
Something ahould always be going on in the depths though. The horn, acting in reverse as a “microphone”, picks up ambient sounds of the forest and passing planes. Altered in tone by the acoustics of the hole they can be heard, if one listens very carefully, quietly reverberating underground.