a group of high school students under the leadership of the Feeney teacher launched in fieldwork were surprised to discover the underground caves, a safari in an attempt to find the surprise in this strange world of difference , no one thought stuck in this easily accessible , but there is no exit to the end of the cave , not only can not find a way out , but also to escape the rampant everywhere unknown biological kill these poor high school students will soon face the terrible massacre , the crew one by one killed , in the end who have the opportunity to get out alive ?