Noora felt it in her teeth: a memory not hers, like a melody from under the sea that wanted to be remembered. The sign projected a map—lines and nodes and pulses that matched nothing on their municipal schematics. It showed a lattice under the town, a web of old infrastructure: water mains grown into catacombs, steam tunnels braided with live fiber, and in the center, a place marked only with a boiling icon.