[The Doctor is making last minute checks around the console, hitting several levelers and buttons before he turns to the screen grinning like a mad man.]

Ohhhh this door is brilliant isn't it? Anyone gone through yet?

[He hits another switch.]

Check. Check. Hmm...

[He rubs his chin thoughtfully.]

I seem to be missing something. No, not that.

[He turns around and sees a clutter of equipment in the corner.]

Got those...

[And then it hits him.]

Oh, Rose? Are you still around? Time is ticking.