From executive producer James Cameron (Avatar, Aliens) comes a thrilling underwater adventure based on true events. Master cave diver Frank McGuire leads a team — including his teenaged 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 underwater labyrinth to make it out alive. With time running out, can they survive, or will they be trapped forever?

Region A

Bonus Features for UHD/Blu-ray

DISC ONE (4K UHD):

NEW 4K Presentation From The Original Elements

Presented In Dolby Vision

Audio: English DTS-HD Master Audio 5.1 & 2.0 Stereo

NEW Audio Commentary By Emily Higgins and Billy Dunham

Audio Commentary With Director Alister Grierson, Actor Rhys Waskefield, And Co-Writer/Producer Andrew Wight

DISC TWO (BLU-RAY):

NEW 4K Presentation From The Original Elements

Audio: English DTS-HD Master Audio 5.1 & 2.0 Stereo

NEW Audio Commentary By Emily Higgins and Billy Dunham

Audio Commentary With Director Alister Grierson, Actor Rhys Waskefield, And Co-Writer/Producer Andrew Wight

Deleted Scenes

Sanctum: The Real Story

Nullarbor Dreaming