We're finally getting the Silo answers we've long been craving.Last week we found out who was behind the silos' construction, and this week we learned why they were built in the first place, as well as what might be the cause of the apocalypse that first drove everyone under ground.

What does Silo Season 3, episode 8 tell us about how the world ends?After being abducted by their own car and taken on a mystery flight and helicopter ride, episode 8 sees Daniel (Ashley Zukerman), Helen (Jessica Henwick), and Charles (Jessica Brown Findlay) sitting down for dinner with the silos' creators: billionaire Per Stensen (Colin Hanks) and Senator Thurman (Laura Innes).

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Stensen explains that he currently has diggers creating 50 silos where people could one day live to repopulate the earth, in the event of an apocalypse."The threats we face — nuclear war, climate collapse, viral pandemic, asteroid strike, artificial intelligence, and some we haven't thought of... but the one, the one that is most dangerous, is also the reason why I'm the richest man in history: nanotechnology," he says. "But not just because it's invisible, but because I knew... I knew that an enemy government would soon realise that a nanoweapon was a hell of a lot cheaper to build than a nuclear one."