樱桃几乎能感觉到陈源身上的痛苦,看他紧紧地咬着牙齿,脸上、额际、脖子上的静脉都条条垒起,那模样既吓人,也让人为他心疼。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.