A true story of death and survival in the world's most dangerous sport, cave diving. Two friends plunge 900 ft deep into a water-filled crater in the Kalahari Desert to raise the body of a diver who had perished there a decade before. Only one returns. Unquenchable heroism and complex human relationships amid the perils of extreme sport. In 2005 Australian, David Shaw, travelled to a site known locally as Boesmansgat: Bushman's Hole. His destination was nearly 900 feet below the surface. On 8 January, he stepped into the water. Twenty-five minutes later, one of the men was dead. The other was in mortal peril, and would spend the next 10 hours struggling to survive. What happened that day at Bushman's Hole is the stuff of nightmarish drama, juxtaposing classic elements of suspense with an extreme environment beyond most people's comprehension. But it's also a compelling human story of friendship, heroism and of coming to terms with loss and tragedy.