Sanna is determined to find the chief engineer, while the crew plans a way out of the stranded icebreaker, as no one seems to be coming to their rescue. Meanwhile, Sanna sets out on foot to search for a missing crew member who stole her hovercraft.

The crew attempts to fix the icebreaker's engine, with disastrous consequences. Something keeps attacking them. With no other options, they must evacuate across the ice. There, Sanna encounters someone who should be dead, and an invisible force pulls a crew member into the fog.