On a rescue mission to the North Pole to retrieve his old friend Captain Streiner (Tim Cartwright) and his lost expedition crew, Captain Mortimer (Rory Wilton) and the crew of the HMS Innsmouth get more than they bargained for when their ship is frozen into the ice sheet and set upon by bloodthirsty fish creatures.
Mortimer and his surviving crew flee the ship, beginning a treacherous journey to find safety in an ice-bound desolate wilderness. Suffering from starvation, frostbite and a slow madness, they find shelter inside a snowy mountain, but are they as safe as they think, or have they entered the heart of the creatures’ lair?