[From
here]
"...What?"
The door slammed shut behind them and locked with a rather distinctive click. The Doctor glanced back at the door-which was very different on this side than it had been on that side-but it wasn't the slam or the door that ended up grabbing the Doctor's attention. There was a loud rumbling that did not, he was quite positive, have anything to do with the thunder that they would have heard more clearly outside. Nor was it a sound that would have come from any construction work, had he and Dean stumbled across it. No, this was different.
"What?"
Following that hall, they should have exited the building into the field. It should led have outside, should have been raining. But in here-inside here-well... that definitely wasn't rain.
Not rainwater, at least. It rather appeared to be raining boulders in the room.
"What."