On January 8, 2005, veteran diver Dave Shaw plunged into the abyss of Bushman's Hole, a 900-foot sinkhole in South Africa, to recover the body of Deon Dreyer, lost a decade earlier in its crushing depths. What began as a daring rescue mission turned into a nightmare when a blinding silt cloud swallowed Shaw at 886 feet, severing his lifeline and trapping him in a watery grave alongside the man he came to save. Viewer discretion is advised - this haunting true story, illustrated with eerie stock footage, reveals the razor-thin line between heroism and tragedy in one of the world's deadliest dives.