Billings' faith is shaken. Lukas heads to the down deep. Knox identifies the traitor. Juliette uncovers the truth about Solo's past.

Juliette discovers something's happened to Solo. Bernard makes an offer to Walker. Lukas meets with Salvador Quinn's descendants.

Lukas is assigned a mission. Mechanical sends a powerful message. Juliette embarks on a perilous descent—and confronts a new danger.

Bernard enacts a plan to root out Knox, Shirley, and Walker. Billings takes a stand. Solo saves Juliette's life and wants something in return.

Sims finds himself with a new position. Juliette learns Solo isn't being honest. Bernard and Lukas make an important discovery.

Juliette sets out on a dangerous quest to retrieve a suit so she can return home and save her silo. Mechanical plans a meeting with Judge Meadows.

Bernard turns to Judge Meadows for help. Billings begins to wonder if he's being lied to. Juliette finally meets the man in the vault.

In Silo 18, shock and unrest take hold in the wake of Juliette doing what no one's done before.

Juliette finds sanctuary in a silo long ago destroyed by war, thinking she's alone.