"Or you could say it's bigger on the inside," Gwen joked, shrugging her shoulders and smiling. "Either way, it's definitely not what she seems from outside."
"Right!" Jack clapped his hands and then rubbed them together as he continued grinning like an excited kid. "This is basically the main control room and we fly the ship from here. That weird noise she makes? Completely the Doctor's fault because he leaves the parking brakes on. And yes, there really is a pool and wait until you see the library!"
He flipped the Doctor a salute and paused long enough to give Martha a kiss (ignoring the disapproving look from the Doctor), and led his friends deeper into the interior of the TARDIS so he could give them a proper tour.