讲述了四名少女索菲·内利斯，科琳·福克斯，布莱恩·朱和西斯廷·史泰龙的潜水冒险，她们探索了一个被淹没的玛雅城。当她们进入内部发现下沉的废墟是致命大白鲨的猎场，心情由兴奋转为惊恐。随着她们的供氧逐渐减少，必须在水下错综复杂…

A haunting tale of family life. A vulnerable young boy finds his mother pushed out of the family home by a strange new woman, and he must confront the terrifying supernatural forces that seem to move in with her.