一句话也没说，陈源又把她扶到自己房间，小心地把她扶到他的床沿上坐下。要喝水吗？嘴上问着要不要喝水，陈源却就势紧紧地挨着她一起坐在床沿，双手还半搂半抱着她。A young newlywed couple find themselves trapped in a network of underground caves. With her husband injured, the new bride is forced to find her way back to the surface in order to save his life. In the process, they discover a terrifying truth about the "underneath", they are not alone. Something evil is hunting them.
