The Doctor: I reset the HADS.
Clara: Huh?
The Doctor: I reset the HADS!
Clara: The what?
The Doctor: The HADS! The Hostile Action Displacement System. If the TARDIS comes under attack--gunfire, time winds, the sea... it relocates.
Clara: Oh Doctor.
The Doctor: I haven't used it in donkey's years. It seemed like a good idea at the time. Well never mind. It's bound to turn up somewhere. Ooo! Ha! See? Right on cue. Brilliant.
Clara: Brilliant?
The Doctor: The TARDIS is at The Pole.
Clara: Not far then.
The Doctor: The South Pole...... Can we have a lift?
I loved that!