"Maybe," the Doctor said, taking the needle from the record. "Or maybe they're hiding somewhere."

He looked up and around them. "What would they be hiding from---"

His eyes went wide as he went to the window. "River, take a look at this."

Outside the window was a dark view of the ocean. Deep and vast, with a large squid flitting past them. They were at the bottom of the ocean. The whole city, all neon lights and huge spires, was under the water.