He may be heading to space with Avatar, but on some level, James Cameron is still mired under the sea. He directed two deep-sea documentaries after the sea adventures of Titanic, and now will produce Sanctum, a drama about a diving team trapped for two days in an underwater cave.

Sanctum, which will be filmed in 3-D of course, is a fictionalized version of a true story about divers trapped in the cave off the coast of Australia when a freak storm collapsed the cave entrance. According to Variety, the movie version will follow a "hard-edged" father and son pair who lead the diving team. Alister Grierson, who made the UK World War Ii film Kokoda, will direct the screenplay by Andrew Wight and John Garvin. Wight was one of the divers who survived the real-life cave collapse.

Unlike many movie moguls of his stature, Cameron hasn't lent his name to a whole lot of projects as a producer, and what he has shepherded has been mostly documentary stuff. It'll be interesting to see how strong his hand is in the final project, and if he can do for Alister Grierson what Peter Jackson accomplished for Neill Blomkamp with District 9.