The mountain that eats sound. Places the maps leave blank.

Active cancellation at city scale: sensor array, processor, emitter array projecting anti-phase energy so incoming acoustic — and, in the compiler's model, electromagnetic — returns destructively interfere. Human ANC works below a kilohertz over a few cubic metres. The Stifling Field does the same arithmetic several orders of magnitude larger. A confirmed null zone, Southern Ural Site 1 among forty-three, is a volume from which outgoing seismic energy does not come back. Not attenuated. Absent. The 1991 Class-IV Cancellation Events in that compiler's dissertation were the upper boundary of this field, misread as geology.

One site requires approximately 2.4 megawatts of continuous acoustic power. Forty-three sites, concealment alone: on the order of 103 megawatts. The organism's civilisation is a thermodynamic object before it is a cultural one. The blank spots on the map are powered.