Sanctum

Based on true events, it’s "Descent" meets "127 Hours", but with lots more water in this action/thriller. When a cyclone hits New Guinea, an exploratory team gets trapped in a massive series of underwater caves and must find another exit. The beauty of the island and the caves are really striking in 3D, but soon everything turns dim, dismal, and deadly. Producer James Cameron combines his passion for filmmaking and underwater exploration as the intensity and sacrifices increase in his version of Survivor: Cutthroat Island. If you are squeamish about a few dead bodies, you may want to stay out of these caves; else, you can boldly go where no man has gone before.

Alien gives it 3 "mother of all caves" stars out of 4.