Grid sound effects, as in the power grid. Transformer hum, electric station buzz and the steady drone of high voltage doing its job, some recorded on site and some pushed into designed territory. Then some odd neighbours: bodyfalls onto hard surfaces, and the metal body of an old army truck struck with mallets. Low and humming, mostly.
The hum is the heart of it. A Transformer gives off a low constant tone with a buzz on top, and these recordings run from a gentle hum to the full roar of an electric station. It makes a good bed for tension under a control room scene. Pair it with a Generator when the lights need to flicker.
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