Enter James Camerons secret Sanctum 3D

JAMES CAMERON has gone underground - or at least his latest movie has.

And I've reached into the deep to bring you an exclusive clip from Sanctum.

The Avatar director is executive producer on the disaster flick, which sees a team of cave divers cut off in the most inaccessible system on the planet.

Master diver Frank McGuire, played by Aussie star RICHARD ROXBURGH, leads a party, including his 17-year-old son, into the South Pacific's Esa'ala caves.

A tropical storm leaves his exit impassable and the group are forced to find an alternative route to safety.