When a daring mission leads a deep sea submarine team into a mysterious opening on the ocean floor, they uncover a lost underwater world and awaken its ancient race of otherworldly beings.

故事聚焦在一支研究团队，他们被派到科拉深孔（Kola Superdeep Borehole）去调查源自于深处的奇怪声音，他们却发现超乎他们所有想像的东西。更糟的是，他们可能无意间将躲藏在深处的东西给释放了出来。