In 2039, Earth's oxygen levels are dangerously low, making it uninhabitable. Darius, an engineer in Brooklyn, ventures out to clean solar panels while his father goes to a bookstore. An accident leaves his father hanging off the ceiling, struggling to breathe. Despite Darius' efforts, his father passes away. The family bunker, engineered by Darius and his wife Maya, provides safety. Darius decides to bury his father next to his mother, triggering Zora's protests. Months later, Darius goes missing, prompting Maya and Zora to adapt and survive. Tess and Lucas, strangers seeking help for their failing air system, encounter Maya and Zora. After a tense stand-off, Maya decides to collaborate with Tess to potentially revolutionize the world. However, a misunderstanding leads to conflict, resulting in Micah being restrained in the shelter. Maya remains wary of Tess's motives.