A lean, clear-headed 3-D thriller that knows exactly where it's headed from the moment its adrenaline junkie explorers dive into the world's biggest cave in Papua New Guinea.
The director Alister Grierson, not grasping that bad dialogue is sometimes best delivered quietly, encourages his actors to shout and thrash about, and so they do, like fish out of water and performers out of their depth.
No film in recent memory has been so strenuously at war with itself, although for me, a self-confessed sucker for the IMAX brand of eye candy, the images narrowly-as well as widely-carry the day.
Here and there an image of spectral beauty, assisted by the 3-D technology, floats into view and captures our imagination. But the script, which really should've been called "Sanctimonium," has a serious case of the bends.
Stick that camera down an aquatic cave, wrap a paper-thin plot around it, slap the whole thing up on an IMAX screen and call it a movie. More truth in advertising: Call it a lame movie.