Go behind-the-scenes of episode 3 of 'Doctor Who' Series 9, "Under The Lake." Warning: May contain spoilers if you haven't watched the episode yet! Water, water, everywhere: Filming an underwater base on dry land is no easy feat - cast and crew tell us how! http://www.youtube.com/watch?v=-0OLrl4Vdm4 Becoming a Ghost: How do you become the scariest ghost on … Continue reading ‘Doctor Who’ Series 9 Extra – “Under The Lake”