In the distant future, when the ocean has risen up to consume nearly all of humanity, a surviving woman watches her descendants grow less and less human and morph into alien-like creatures. She recounts her memories of the flood as she ascends a mountain to see her children, who have been left there to adapt into their new bodies.

A microphone operator returns to England from working on a documentary project in Greenland, only to find she has brought home the curse of the shark that killed her coworker and now endangers her son.