《鲨海逃生》讲述了四名少女索菲·内利斯（Sophie Nélisse），科琳·福克斯（Corinne Foxx），布莱恩·朱（Brianne Tju）和西斯廷·史泰龙（Sistine Stallone）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且幽闭恐怖的洞穴和诡异的隧道中寻找逃离水牢的出路。47 Meters Down: Uncaged follows the diving adventure of four teenage girls (Sophie Nélisse, Corinne Foxx, Brianne Tju and Sistine Stallone) exploring 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.