The end of the end of the world is now in sight. Apple just announced that its post-apocalyptic series Silo, which is in the midst of its second season, has been renewed for two more seasons. That means that season 4 will be the show’s last.

Silo first debuted in 2023, and it tells the story of the remnants of humanity, who live in an underground silo where they’re largely safe from the ruined landscape outside. However, things get much more complex very quickly, and the show is laden with mysteries. The series is based on a trilogy of sci-fi novels from Hugh Howey, and Apple says that the final two seasons will tell “the complete story” of the books. (So far, the first book has been split across the first two seasons of the show.)

“With the final two chapters of Silo, we can’t wait to give fans of the show an incredibly satisfying conclusion to the many mysteries and unanswered questions contained within the walls of these silos,” showrunner Graham Yost said in a statement. Rebecca Ferguson, who stars in the show and serves as an executive producer, added that “I have always felt passionately about telling the entire story contained within Hugh Howey’s books, so I couldn’t be happier that audiences around the world have enthusiastically embraced the show.”