Luce woke up with a jolt, the sprinkler system spraying water onto his unsuspecting face. The brightness of the glow light he had been working on the night before pierced through his worn goggles. He'd fallen asleep in the garden rooms again.
With a groan he stretched his limbs, pushing the goggles up into dark, tousled hair and rubbing at his eyes. He must have finished the repairs if the lights were working now. No use in sitting around getting wet. He stood and gathered his scattered tools, wiping away the worst of the dampness on his grease-stained shirt. The Head Engineer must be looking for him by now; it had been a busy week preparing for the door opening. Things needed to be packed away safely, tools secreted in mobile satchels to be pulled out at a moment's notice, and the vaults' gardens and medical facilities in order in case something happened top-side.
Luce was scared. Sure, the other engineers assured him that they had big, interesting engines and machines outside. But was it worth leaving the vaults, where everything is safe and bright all the time? Mama had told him stories about the sun and how warm it had been on her face, how her skin had turned browner if she stayed out too long. Of course they wouldn't really be leaving yet. The vaults would act as home base before they establish a colony but Luce couldn't help but feel that this was the end of their way of life anyway. He was scared.
He traced the metallic walls of the vaults on his way back to the Engineering Department, saying a silent goodbye with his fingertips. He passed the generator room on his way, gears ticking and pumps hissing, and imagined that he had heard an odd rhythm in the beating of the vaults' heart, as if it was saying goodbye to him too in its own way.