Silo S3E8 Recap: “Gray Goo” — A Peach of a Hole in the Ground

The following recap contains spoilers from Silo S3E8, “Gray Goo” (written by Jenny DeArmitt-Stran and directed by Amber Templemore)

---

From the beginning of Silo, there has been the question as to what led these people to live underground. They themselves don’t seem to know, though they’re told that it’s toxic outside. Their history has been meaningfully erased. So, you might think that the biggest mystery of the series is in the question of why the silos were created, but I’ve long wondered more about why the underground society is structured as it is.

Silo S3E8 provides some answers to the former question, but if they feel unsatisfying it is perhaps because what we really want is more information with regard to the latter. In particular, since we’ve learned about the Safeguard, we’ve wanted to know why the powers that be would use it to kill everyone in the silo (i.e., what are they safeguarding against, exactly?). Bernard (Tim Robbins) at least acknowledges that question in this episode, so I hope we get more of answer by the end of the season.

I Want to be Gray Goo with You

Let’s begin, however, in the Before Times, where Helen (Jessica Henwick) and Daniel (Ashley Zukerman) finally get some answers from Per Stenson (Colin Hanks) and Senator Thurman (Laura Innes) as they dine together in Georgia. They aren’t just drilling one gigantic hole in the ground—the plan is to drill 50—and they invoke the idea of a silo as a place to store seeds, before noting that the seeds they’re really interested in storing are human beings who could repopulate the Earth after a coming catastrophe.

Senator Thurman suggests that the threat to humanity is imminent, though (much like any number of real world political figures in 2026), she isn’t really using the word correctly. There are a number of things that could cause humanity to need to go underground, from nuclear war to climate collapse, and maybe that could happen at any time, but it’s not like it’s about to happen tomorrow, or within any precise timeframe they can predict (so far as we know).

What’s novel in the story of Silo is the existence of nano-weapons that go beyond anything known to exist in the real world (don’t worry, they’re working on it!), and which have been deployed by Iran in their “dirty bomb” attack on Washington DC, and against Charlotte’s (Jessica Brown Findlay) squad. It becomes readily apparent that the point of Charlotte’s squad’s mission was actually to test Iran’s capablities in this regard. They were, at best, canaries in the coal mine.

Helen points this out, and Charlotte’s PTSD gets triggered. I guess that calls for an apology, but it’s also just the truth, and I feel like Charlotte is being manipulated.

Regardless, the nano-weapons could turn people into “gray goo” (no idea how Charlotte survived the attack), and Stenson worries that they will become cheap and easy enough to produce that they might be deployed not just by world governments, but potentially by some troll in his garage. Thus, the silos.

It’s worth noting that Stenson also mentions AI during this scene, and he seems to think of it as a threat, which is interesting given that we know that the silos will ultimately be overseen by AI (The Algorithm). I’m led to wonder whether this ends up being a part of his plan, or if his plan will be hijacked at some point in the future.

I’m additionally curious about the AI in this story. I have not read the books on which Silo is based, but they were written some 15 years ago (2011-2013), so Hugh Howey could not have been thinking about the LLMs and such that have come to be known as AI more recently, but was working within its history as a science fiction concept. In contrast, the creators of the Silo TV series must certainly be influenced in their thinking by the rise of real world “AI” and that might lead to some divergence from the source material. Even if it doesn’t, it has surely affected how the notion of AI lands for us as viewers, which is interesting to think about.

Stenson and Thurman want Daniel, Helen, and Charlotte to join their project. It’s hard to see why. Cynically, I take it as a continuation of the plan to keep them silent, but if it’s not that, and we’re more charitable, I suppose it would have to relate to their gumption and curiosity. But, those are the kind of traits that the rules in the Silo 18 of the future seek to limit, to the point of denying people the right to have children.

There could be some clues here to indicate that Stenson’s plan doesn’t line up with what will actually happen. Thurman says that, when the existence of the silos is leaked in several years, they’ll call the project Stenson’s Folly, but have the silos should they need them at some point. And, again, that’s all in tension with characterizing the threat as “imminent,” but maybe she’s lying about this Stenson’s Folly part?

Charlotte agrees to stay, whether because of her relationship with Dr. Crnovich (Matt Craven), her relationship with Anna (Morven Christie), or because she’s scared of what attacked her in Iran. Helen, in contrast, rejects the offer immediately, calling the group Morlocks, and, ultimately, Daniel does too. He joins Helen in the helicopter that will take them home, tells her that he wants to become gray goo with her, and they kiss.

Disabling the Safeguard

As last week’s episode ended, we learned that Lukas Kyle (Avi Nash) and Patrick Kennedy (Rick Gomez) were not dead, as Kennedy re-established radio contact with our friends in Silo 18. Silo S3E8 opens by showing us things from their perspective. Apparently they were able to survive (what I surmise was a drone attack) by lying on the ground.

Lukas has been shot in his shoulder (through the radio), but they are able to make it the rest of the way to Silo 17, where Solo Jimmy (Steve Zahn) fixes their radio with the help of a book. They communicate in code with Juliette (Rebecca Ferguson), who encourages Jimmy to help Patrick investigate what happened to Jimmy’s mom, who died disabling the Safeguard.

Kennedy determines that Jimmy’s mom sealed the panel she was in from the inside, sacrificing herself to keep the poison from getting to the rest of the silo, but he needs to move her body to more thoroughly inspect her work and relay relevant information to Silo 18.

Jimmy does not like that idea and forbids it, until Patrick tells him about funerals in Silo 18 and convinces Jimmy to have a ceremony. It’s a touching scene, where we’re reminded that Jimmy is functionally a child (no one he knew ever died, until everyone did), and Kennedy lets down his gruff façade a bit to show the humanity underneath.

In terms of the plot, though, one could argue that all of this amounts to Silo spinning its wheels a bit in this episode, and the same goes for what occurs in Silo 18 after Kennedy relays information about the Safeguard. They hatch a plan, which involves Sandy (Chipo Chung) posing as a supervisor so that Shirley (Remmie Milner) can get into Judicial and do the needed work, but Camille (Alexandria Riley) is onto them well enough now that Emerson (Florian Clare) stops Sandy in her tracks. Sandy is able to relay a warning to Juliette, which gets Shirley out of harm’s way, but Juliette is arrested and thrown into the same cell as Robert Sims (Common), leaving Shirley and Walker (Harriet Walter) to debate their next move.

They consider reverting to their plan to blow up Judicial, but they aren’t going to do that now that it would mean killing Juliette (and it didn’t make a lot of sense, anyway). Walker insists that they have to do something. We’ll just have to wait until next week to find out what it is.

Maybe the way out of the narrative corner Silo has painted itself into will come in an unforeseen way. Camille and Robert are on the outs, and given the fact that The Algorithm has tasked Camille with finding out what Juliette has been planning, it would be easy to read her conversation with her husband along these lines. However, all things being equal, I do think Camille would like to disable the Safeguard and preserve the memories of everyone in the silo. She just views going along with the Algorithm as a better option than everyone dying.

She’s in the position now that Bernard used to inhabit. He tells Juliette that he always viewed the things he had to do as the head of IT as justified, even as he doubts that now. He didn’t know about the Safeguard—and when he learned he proceeded to try to go outside to be free for one second of his life—but even now he wants to know why Silo 1 would have this power, and thinks they need to be open to the possibility that there is a good reason. He views capping the Safeguard as a step towards conversation.

I hope that conversation happens, but first our friends in Silo 18 need to figure out how to keep the Algorithm from killing everyone (and fix the water supply). Best case, I’m hoping for a major revelation in the season finale that blows the narrative open as we head into Season 4.

Who Killed Orla Kent?

We’ve got an answer! It was the boyfriend, Mike (Chris Fulton). It’s always the boyfriend.

More interesting, perhaps, are the details that lead to Billings (Chinaza Uche) solving the case. Ed Harwood (Ned Dennehy) built an elevator (it’s worth remembering that this sort of thing is banned in the silo, for unknown reasons), and has been using it to steal from Critical Supply. He says he started during the rebellion, and was worried about keeping things like lightbulbs safe.

I’m not sure if that’s true, and also not sure if the lightbulbs and such have been recovered by the end of this episode, but I do continue to think that this plotline has served to set up what will be one of the main problems of Season 4, because we’ve learned that Silo 18 has somewhere between two and 50 years before everyone dies in the dark. That problem starts to feel pretty imminent even if it’s 50 years!

This also ties back to what we’re learning in the Before Times. If we take everything at face value, the inference would be that the plan was for people to live in the silos for 400 years, with the thought that it would be safe for them to leave after 400 years. But, there are a lot of things that should make us question that.

The existence of the Safeguard feels like the biggest wrinkle at this point, because, if it were truly unsafe outside of the silo, why would you have to kill everyone in the silo for trying to leave, particularly when they don’t know about the threat? It makes me wonder if it is only unsafe outside because (and when) the powers that be make it so, as I think back to Solo’s remark in Season 2 about when “the dust came” and whatever happened when Lukas and Kennedy were attacked by a drone.

Per Stenson says that he is going to pay employees to be a part of a test of the silos he’s digging, with 100 people per silo. What if that became 10,000 per silo, they wiped everyone’s memory, instituted the Safeguard, put AI in charge, and this whole thing has just been going on its own for a few centuries, even as the world at large is fine?

See you next week.