A female project manager hires a young male intern, and when he starts staying late to help, they have a one-night stand. Embarrassed by the incident, she apologizes and breaks things off quickly, but the intern isn't ready to let go yet.
After an earthquake leaves Danny trapped and alone, his claustrophobic nightmare only gets worse when something truly horrifying emerges from the fissures in the ground, forcing him to engage in a brutal fight for his life and his sanity.