“This was a beautiful world once, aeons ago, until war, pollution, and sheer carelessness made it all but uninhabitable,” the Doctor said quietly as he and Amy wandered through crumbling corridors, their footsteps muffled by centuries’ worth of accumulated dust.
“What happened to the people?” Amy asked. “Did they leave?” The place felt eerie in its almost complete silence, devoid of any kind of life other than themselves.
The Doctor shook his head. “They’re still here, waiting patiently. They built themselves cryo-sleep chambers deep underground, and there they’ll stay, asleep and dreaming, until their planet can once again support life.”