it be nice to see such a good horror film and good to see if you know the background and that be real story on which this film be make . even though film be pick up well from begin and doesn not allow spectacular to move from the seat and after some time you can easily predict what will happen next . at some place director could have reduce the human body cut scene . these scene be more ugly than horror . also they have not show anything happen in the outside world even though policeman in first scene be kill and these 4 friend disappears . that be bit surprising . also all 4 friend look energetic throughout the life of their character even though they do not eat or drink anything after their accident . it be one more goof in the film . this film be good entertainment for horror film lover .