Water, ground drawn, may have bubbles resembling froth, spume, effervescence. Such bubbles, when pumped up from bedrock, may be dissolved gasses - carbon dioxide, hydrogen sulfide, radon, methane. Imagine small wells watched and filmed worldwide, accompanied by the sound of the place, the sound of the well. A palimpsest of data, but infrequent. A howl, a hoot, a moo, a crow. The pump of the air where once, underneath, hidden, wet stone, alone.