Sanctum

Sanctum, starring Richard Roxburgh and Alice Parkinson (2011) Rated R Master diver Frank McGuire leads a team -- including his 17-year-old son -- to explore the largest, most beautiful, and least accessible cave system on earth. But when a tropical storm cuts off their only escape route, the team must work together to find their way through an uncharted and dangerous labyrinth. [James] Cameron served as executive producer to this crazy tale of a cave-diving expedition forced to improvise when a typhoon inundates their New Guinea location. -- Amazon