四个朋友去一个偏远的小屋度周末。一开始的田园诗般的静修很快演变成一场生死之战，当地的邪教把她们献给了自己的女神，作为夏至的祭品...

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....