Sixty years ago, the Ark, carrying humanity's hope for pioneering, encountered an accident and was trapped on a desolate track. The survivors struggled to survive in a closed ecosystem. Today, a large number of algae have died in the seventh ecological zone, the oxygen content continues to drop, and more than 30 survivors are facing a suffocation crisis. Su Wan, the daughter of a mechanic, accidentally discovers the notebook left by her father and reveals a shocking secret: Area G7 contains the gene-edited organism "Gaia" that ran out of control 25 years ago, and its pollution is eroding the ecology of the entire ship. In order to survive, Su Wan, technician Lin Chuan and veteran Zhao Zizi broke through the blockade and went deep into the G7 area. They face mutated creatures and strange replicas that can swallow metal and organic matter, uncover the truth about the experiment that Uncle Chen concealed, and discover that their father's death is closely related to this crisis. In the end, Su Wan used blood and courage as the key to make a choice between biological core and human survival, vowing to take the Ark to the lost new home and restart the fire of human civilization.
