After an all-night graduation beach party, a group of hung-over students wakes up under the blazing sun to find their numbers somewhat depleted. An enormous alien creature has burrowed down deep and anyone foolish enough to make contact with the sand finds themselves at the mercy of a sea of flesh-eating tentacles. Will they ever be able to escape its carnivorous clutches?

While investigating the disappearance of an US Marine recruit at a top secret SERE (Survival, Evasion, Resistance & Escape) training site, Avril Heart, an undercover Department of Homeland Security agent, endures 'enhanced interrogation' in order to learn the truth. After the death of another Marine cooperating with her investigation, Agent Heart discovers a shocking conspiracy that calls into question everything she is fighting for.