On the way to a reading, an academic stumbles into a mysterious infrastructure.

"For some reason he couldn’t put his finger on he was feeling happy. Naturally it had been a relief to come in out of the rain—though this particular brand of happiness seemed unrelated to anything as simple as relief. No, there was something about being in the tunnel that was making him feel very happy, almost ecstatically so. Against the wall just inside the door someone had arranged cleaning implements—several brooms, a bucket with a mop in it, a pile of rags—but other than that the tunnel was empty. The walls at this end had been painted with the green, glossy paint beloved of institutions the world over, the paint having been applied in what seemed like a spirit of gay abandon. The smooth concrete floor was splashed with it, and it depended in hardened drips from a series of thin pipes running lengthwise along the ceiling."