Nick was following some thin pipes about three feet off the ground and running along the wall.
“What are you looking for?” Todd finally asked.
“I think these—” he tapped one small pipe with his finger “—carry wiring from solar panels.” Nick pointed up. Todd stopped the horse and looked at the ceiling. “When I was here before, I didn’t take the time to examine it very closely. See those holes, where the lights are?”
“Yeah.” Todd stood in the stirrups, trying to get a better look, but the ceiling was too high. “Those are solar lights. At least some of them are.” He resettled in the saddle.
Nick nodded. “I didn’t notice that until we came in here with better illumination.” He turned in a circle, shining the light around. “I don’t see any trains, but there are some tracks. The horses need
