[1] The film centres on diver Dave Shaw's death while attempting to recover the body of Deon Dreyer from the submerged Boesmansgat cave in 2005, through a mix of camcorder footage from the incident and the personal reflections of his surviving friend Don Shirley.
[2] On October 28, 2004, two cave divers and long-time friends, Don Shirley and David Shaw, planned a dive at Boesmansgat.
Gordon Hiles, a cameraman from Cape Town, was filming all throughout the process - from the preparation on the surface to the operation at the bottom of the cave.
Half of the scenes were shot in Don's diving centre, the Komati Springs cave, a multilevel underwater mine, 180-meter deep, with many kilometres of galleries.
Because of the lack of communication underwater, the team would rehearse on the surface for long hours until they memorized the shots and the order in which they would be filmed.