Jason and Paul dive in (pun intended) to the two-part story Under the Lake and Before the Flood.  Going over the deep end, they find themselves dealing with underwater bases, ghosts, and an alien who wants everyone to invade his planet!  All that and more, on this episode of Talking Timelords!  So, join them as they wrap their brains around the real question.  Who really wrote Beethoven's Fifth?!?