claracswald:

I have to do this, Clara. It’s the only way. I have to be strong. I should have known from the very beginning. Of course. The portrait of you, the creature from my own nightmares. This place is my own bespoke torture chamber, intended for me only. And all those skulls in the water. How could there be other prisoners in my Hell? The answer, of course, is there never were any other prisoners. And the stars, they weren’t in the wrong place, and I haven’t time travelled. I’ve just been here a very, very long time.