A trailer has been released for Sanctum, the James Cameron-produced feature that Alister Grierson directed based on the natural mishap that befell a team of cave divers in Australia. The film will be released February 4, and is considered an important next step in Cameron’s evolution of 3D technology for films that don’t have to be made on the budget scale of Avatar, but look superior to films shot in 2D and then converted. The $30 million film, financed by Wayfare Entertainment, was scripted Andrew Wight and John Garvin. The drama is based on the near-death experience of Wight, who has collaborated with Cameron on such docus as Aliens of the Deep and Ghosts of the Abyss, and who led the perilous dive expedition.