mixed group of expert ( explorer and diver and scientist ) venture a mile underground and go another 2 . 4 mile underwater to a spot even more remote and where they find salamander and giant albino mole ( . ) and some big and razor fanged and wing and computer generate creature lurk about . the cave be seal off by a rockslide and then the monster attack and start kill everyone off a they search for an exit . and that all she write with this low aim effort that even fail to combine action and science fiction and horror on the most elementary of level . imagine if someone give the folk at the sci fi channel 30 million dollar to make a monster movie . that precisely what the cave be like while almost startle in it ineptitude at time and full of clichés and almost entirely dependent on the special effect to entertain . the only difference be they have more money to build set and more money to polish up the monster and more money to hire supposedly professional actor who give awful performance anyway . otherwise and it business a usual . some of these movie be still fun to watch . this one be not and there be load of reason why represent 1 . ) it take itself far too seriously and have no sense of humor whatsoever . so you get a completely unoriginal and predictable movie that doesn not even recognize how unoriginal and predictable it be . 2 . ) the opening sequence serve no purpose whatsoever other than kill a few minute and add to the redundancy . 3 . ) unoriginal look cgi creature be not impress anyone in this day and age . 4 . ) utilize shakycam and quick cut edit for your horror scene be simply lazy and unimaginative film making . and why further obscure the action by make thing too dark and add annoy distraction and such a fire and explosion of bubble . it make these scene not only difficult to see and but also impossible to enjoy even on a no brainer action level . 5 . ) even though it want you take to it seriously and the script be full of clichés and the dialogue be awful and there no attempt whatsoever at characterization . cast 25 year old look model type in role a brilliant scientist and gruff veteran explorer might provide some eye candy but it completely kill the credibility of a movie that otherwise play out completely straight . sorry and you can not have it both way . 6 . ) there be two exception to the model rule and a they do decide to cast an old guy and an average look joe . these be the first two character kill off . 7 . ) for a little diversity and they also squeeze in a black guy and a chinese guy . strangely and neither be give much of a voice in this film and basically stand in the background a whitey discuss what their next move will be . insult . 8 . ) furthermore and how many movie have to be make where a black character sacrifice his life at the very end just to ensure hot white female lead and hot white male lead end up together at the end . ugh . give me a break already . 9 . ) much of the acting be horrible . cole hauser performance be completely laughable . the other male lead look like he just walk off the set of a soap opera and coast by use the patent dimple smile make all the lady swoon technique and which be the pg 13 gender switch equivalent to my large breast make all the guy swoon technique often use by lady in r rat film . either way and his performance be completely phone in . daniel dae kim ( from the tv series lose ) and piper perabo also stink up the room with their stilted and monotone line delivery . 10 . ) be the end a joke . absolutely terrible . please god and we do not need a sequel to this garbage . so basically i wouldn not bother with this one and unless you have never see a monster movie before or if youre just really desperate and the only other thing on be the simple life . the set be good and the blue tint photography be ok and a few of the actor ( lena headey and marcel iures . ) try their best and so i decide to boost the rating up one notch to a 2 .