Updated through S2E3
Steve Zahn plays Solo, who as a boy sealed himself inside the IT vault of Silo 17 when its population went outside and died. Juliette meets him in Season 2 - a traumatised mirror of what Silo 18 could become.
What's confirmed in canon
S2E3Introduced as the sole survivor of Silo 17, sheltering behind the IT vault door for ~30 years.
S2Was tied to Silo 17's IT and ordered to seal the vault and let no one in; the name "Solo" comes from a remark he misheard as a boy.
Where the community lands
Solo is the show's living proof that a silo can die completely. Fans watch him as both a warning and a source: he was close to Silo 17's IT and may hold pieces of the truth even he does not understand.
Still open
Q1How did Silo 17 actually fall?
Q2What does Solo know that he cannot articulate?
Q3Are there other survivors?
Connected entities
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