Mara worked through the night, cleaning sediment from the grooves while the union’s trucks revved to collect the plaque for replacement. Each sweep coaxed the hum into clearer voice. By dawn the plaque glowed like frost. The hum rearranged into a pattern she recognized from childhood lessons: a map. It pointed down through the maintenance ducts into the city’s belly, where the old filtration membranes still beat like lungs.
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