‘Sanctum’ a 3-D underwater adventure

When: Opening Friday at local theaters

Cast: Richard Roxburgh, Rhys Wakefield, Ioan Gruffudd

Director: Alister Grierson

The story: Underwater cave divers must swim for their lives when a tropical storm floods the world’s largest cave system, forcing them to find another way out.

The buzz: This 3-D underwater adventure is being advertised as “James Cameron’s Sanctum,” but don’t be fooled. “Avatar” director Cameron is one of nine producers; another is co-writer Andrew Wight, whose real-life ordeal, during which he and 14 other cave divers were trapped for two days, inspired “Sanctum’s” story line.