The discovery of a safe physical messenger route between the three isolated stations came not from ancient blueprints, but from the ecological behavior of a common river insect. Imran Bell had noticed a strange flaw in the heat sensors mounted along the western foundation wall.
‘Pella, look at the sensor line running along Conduit Seven,’ Imran’s voice came through the audio horn, with the clicking of his computer keyboard in Harrowby. ‘The heat drops thirty degrees in less than ten feet of rock. And look at the sound monitors: there’s a colony of lantern beetles nesting right behind the granite casing.’
Pella climbed the timber ladder in the cooperage cellar, with Eren Tal carrying a short pry-bar. Behind a stack of rotting cedar barrel staves, they found a rusted iron air-flow grating set into the foundation bedrock. Eren snapped the mounting bolts and pulled the grating free. Then, a stream of cool, fresh mountain air rushed into the room, smelling of moss, wet fern, and pine needles.
Pella peeked into the dark shaft with her lantern. She saw hundreds of tiny, glowing blue dots clustered along the limestone ceiling. Native lantern beetles, an insect species that could only survive in cool, unpolluted air below twenty degrees.
