Four teenage girls go on a diving adventure to explore a submerged Mayan city. Once inside, their rush of excitement turns into a jolt of terror as they discover the sunken ruins are a hunting ground for deadly great white sharks. With their air supply steadily dwindling, the friends must navigate the underwater labyrinth of claustrophobic caves and eerie tunnels in search of a way out of their watery hell.
After tragically losing his wife, child psychiatrist Dr. Eli Adler encounters a troubled young boy who seems to have a haunting connection to Eli's past.
When twins Devin and Cece are sent to spend a summer in Gravesend, Brooklyn with their divorced dad, scientist Anthony Brewer, they must band together with new friends to save the neighborhood from a long-dormant threat.
