Sanctum was conceived from the start in 3D, and shot to take full creative effect of the tool. As the dangers mount and claim the lives of many on the team, Frank and Josh must work through their issues if they are to survive. The film tells the story of veteran cave diver Frank (Richard Roxburgh) and his alienated son Josh (Rhys Wakefield) who wind up, along with a larger diving team, trapped far below the surface when a freak storm hits during an expedition. Sanctum essentially asks: Is the z-axis element enough to get the filmgoing public to embrace a movie in a well-worn genre with no well-known actors and few other obvious selling points? But the movie is the lowest-budgeted feature that Cameron, who serves as its executive producer, has been involved with in more than 25 years, and it's an important test of his belief that 3D can be as effective in an intimate, emotional story as it is in a grand epic. Life and death are not quite at stake when Sanctum, a modestly budgeted ($30 million ), 3D, cave-diving adventure comes out. 'It was like sitting with God at the pearly gates watching your entire life.' 'Every time he'd twitch, I wondered, ‘Oh no, what did I do wrong?'' recalled Grierson, 41, who had previously directed only one other movie.

The Australian filmmaker, who made his new movie, Sanctum, under the guiding hand of Avatar creator James Cameron, had to present a finished cut to the famously exacting director in Cameron's home theatre.

If you think your boss is intimidating, imagine how Alister Grierson feels.

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