Very Average to say the least, however the 3D was worth while and effective (most of the time). The limited story of some cave divers who hold crisis talks when the opening collapses with rocks and water filling up their enclosed space fast is appealing for about 10 minutes. James Cameron also produced 'Strange Days' & 'Point Break', both better than this. It must be a mans world down there as many heroics and tempers flare with good, also bad ideas. Any women in earshot are slandered pretty quickly. This is a shame as actress Alice Parkinson comes across the most interesting, however a vapid Dan Wyllie, a male with quips amongst the mayhem,is also cool. Over all there is too much barking orders and intense yelling of survival from all involved comes across trying too hard, rather than playing the actors playing their roles so well. You just want them to find the ocean in a hurry before an all too familiar happy finale. The exterior shots of Australian scrub look rather brilliant.