Horizon travels to the South Pole to tell the inside story of one of the greatest scientific quests of our time. In March 2014, a discovery there made headlines around the world, with evidence from the Big Bang itself - ripples in space and time called 'gravitational waves'. In the world of theoretical physics, this was a bombshell. For some it meant Nobel Prizes, while for others, their ideas were in shreds. This is the story of this extraordinary discovery, and what happened when it all began to unravel...