"Yeah, but if I hadn't managed a controlled temporal implosion, we would have been trapped in here for all eternity. The TARDIS would have basically become a separate universe, completely separate from the other one!

Don't worry, though, there's no danger of that when we're not in flight." He leads her casually through the corridors, casually stepping into the open air and drifting upward when the reached what appeared to be a vertical corridor.