Big man James Cameron executive-produced this adventure thriller based (loosely, of course) on true events. Richard Roxburgh, Ioan Gruffudd, Rhys Wakefield and other extremely British actors find themselves trapped in an unexplored cave system in the South Pacific. With a flash flood raging and their escape route cut off, the explorers must scuba-dive their way to freedom. In 3D, no less! ... Is it just me, or does this seem like it should have monsters in it.109 minutes R.