In case you've been living under a rock (apologies); on 5 August 2010, all 33 of the day shift miners at the San Jose mine in Chile went missing and were feared killed when their copper and gold mine collapsed. For 17 days, no one knew whether they were alive or dead. Miraculously, after all hope was lost, the specialist drilling rigs looking for signs of life smashed through into the tunnel where the men had been clinging on. All 33 of the men were alive and well. Channel 4 were given unprecedented access to the drilling rigs, engineers and medics for the definitive story of how this audacious rescue was carried out. Above ground, the Channel 4 film makers had unique access to document the highs and lows of the drilling teams as they pounded their way through almost half a mile of granite. Below ground the programme follows how the miners survived for so long and hears first hand from the doctors and psychologists who were keeping them sane, giving extraordinary insight into the underground hell they had to endure.