With dwindling supplies, the crew must navigate an underwater labyrinth to make it out. But when his exit is cut off in a flash flood, Frank's team-including 17-year-old son Josh (Rhys Wakefield) and financier Carl Hurley (Ioan Gruffudd)-are forced to radically alter plans. Master diver Frank McGuire (Richard Roxburgh) has explored the South Pacific's Esa-ala Caves for months.

When a tropical storm forces them deep into the caverns, they must fight raging water, deadly terrain and creeping panic as they search for an unknown escape route to the sea. So is this Outside classic of diving in Africa's Bushman's Hole, the third-deepest freshwater cave known to man.Summary: The 3-D action-thriller Sanctum, from executive producer James Cameron, follows a team of underwater cave divers on a treacherous expedition to the largest, most beautiful and least accessible cave system on Earth. Trapped in a network of caves with the entrance blocked and being forced to find another way out? That's pretty extreme. Upload a photo and story of your greatest adventure to the Sanctum Facebook page for a chance to win $1,000 cash and a Canon G12 10MP Digital Camera. Sanctum has also paired with National Geographic and Facebook to host the Sanctum Extreme Adventure Challenge. Your ratings, in turn, determine how extreme you are. To help launch the film, producer Andrew Wight-a long-time collaborator of Cameron's and on whose experience the film is loosely based-has posed a challenging question: How extreme are you? To find out, viewers can go to the Santcum YouTube web site to view a collection of extreme sport clips and rate their extremeness. The Universal Pictures film Sanctum, a 3-D film from Executive Producer James Cameron about 15 cave divers trapped by a freak storm, opens this Friday.

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