The Nereus, a half-century-old icebreaker, has been restored by a passionate crew determined to capture illegal fishermen. During their pursuit, they veer significantly off their intended path and come across a mysterious figure adrift in the heart of the Devil’s Sea. Regardless of their beliefs in superstition, the crew quickly realizes they’ve stumbled upon a lethal creature feasting on the corpse. Their objective now becomes a fight for survival—eliminate the threat or face destruction, ideally before reaching the shore.