this be good little shocker while not perfect by any stretch of the imagination and but tight and competent and disturbing . an excellent example of a simple idea develop into a compelling 90 minute script . the set up require no bell and whistle and no lengthy exposition or wordy back story while kate ( franka pontente ) and a young german business woman living in london and drift off whilst wait for the last tube train . she awaken to find the place desert and but quickly come to realise that she be far from alone . someone and or something and be down there with her and it intention be wholly malicious . in fact she encounter several other character in her quest to survive and include a lecherous work colleague and a homeless couple and a caged sewage worker and all of whom add pace and substance to the plot . there be a slightly awkward gear change somewhere in the middle of the film when tension thriller mutate into gore fest and but nothing so clumsy a to slow the hectic pace . for those of you with weak disposition this be likely to be a harrowing ride while for those of you who relish a bit of well execute carnal mayhem this should press all the right button . the climax of the film be perhaps less successful than the main body of the film and but it be punctuate with a nice moment of unexpected social commentary which provide a satisfying conclusion . some may find themselves feel somewhat cheat of a clear explanation a to the exact nature and history of the threat encounter by kate and her confederate and however and for me this be not the case . a horror film writer should not need feel compel to dot every i and cross every t and in the same way a writer of political thriller might be expect to . there be enough clue here to give you a very pretty clear idea of what bring this evil into existence and make a detailed and conclusive solution superfluous . the retention of a certain sense of mystery be to be welcome and remind u that in this film the ride be always go to be more important than the exact destination . my understanding be that the budget for this film be and to say the least and minimal and in which case our applause for this british horror should be all the louder and for at no point do one have the impression of corner be cut or effect fail to deliver . if this sound like your kind of film then it probably be . buy a ticket and climb aboard .