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Apple TV+ has committed to going down deep with its adaptation of Hugh Howey’s Silo novels.

The streamer announced on Monday morning that Silo, which is midway through streaming Season 2, has been renewed for another two seasons — and that Season 4 will bring the adaptation to a “final, thrilling chapter.”

Silo Ending Season 4

Adapted from Howey’s bestselling WoolShift and Dust trilogy, Silo in Season 1 centered on the (presumably) last 10,000 people on Earth. The twist? They live in a mile-deep silo that is protecting them from a toxic world outside. Executive producer and Mission: Impossible/Dune franchise vet Rebecca Ferguson stars as Juliette Nichols, an engineer-turned-sheriff who aimed to unravel the mystery behind the underground civilization.

Silo Season 1 covered not even half of Howey’s first book, Wool. (Howey’s first, self-published take on the Silo world represents only the first 48 pages of Wool; the other 500 pages, starting with Juliette’s introduction, were added when the novella was met with great success.) Season 2 will cover the remainder of Wool but end, showrunner Graham Yost told TVLine, “in a slightly different way…. There’s a big surprise at the end of the season, and that’s all I’ll say.”

Significant portions of Howey’s second novel, Shift, meanwhile are set hundreds of years prior, back when the W.O.O.L. (World Order Operation Fifty) project that begat the silos first took shape.

Silo Bernard Juliette Dead

“It has been a richly rewarding experience to adapt Hugh’s epic novels with our partners at Apple and we are thrilled to have the opportunity to bring this complete story to the screen over the course of four seasons,” Yost says in a statement. “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.”

Says star and EP Ferguson, “I’ve loved every minute of bringing Juliette to the screen and am immensely proud of what we’ve all created with Silo since the first episode…. Alongside our parters at Apple, Graham, and the entire cast and crew, I cannot wait to dive into these final two thought-provoking seasons that will beautifully conclude this dystopian tale.”

In addition to Ferguson, Season 2 brought back Tim Robbins (as Bernard), Common (as Sims), Harriet Walter (as Martha), Chinaza Uche (as Billings), Avi Nash (as Lukas), Alexandria Riley (as Camille Sims), Shane McCrae (as Knox), Remmie Milner (as Shirley), Clare Perkins (as Carla), Billy Postlethwaite (as Hank), Rick Gomez (as Kennedy), Caitlin Zoz (as Kathleen), Tanya Moodie (as Judge Meadows) and Iain Glen (as Dr. Nichols). Steve Zahn, meanwhile, was added as the mysterious Solo.

In the sixth episode of Silo Season 2, dropping this Friday, Bernard enacts a plan to root out Knox, Shirley, and Walker; Billings takes a stand; and Solo saves Juliette’s life (but wants something in return).

Want scoop on Silo, or for any other TV show? Shoot an email to InsideLine@tvline.com, and your question may be answered via Matt’s Inside Line!