The show is called Silo, on Apple TV. You don’t need an Apple device to watch it; Apple TV is on most smart TV app stores. You can also usually get a free trial. The show is 2 seasons so far. Again, nothing about the show says nanobots (yet). And be warned, the books were very thin on details, but the author is an executive producer on the show, and he’s adding a ton of stuff (and changing others). So they might change it, but you can read the books if you like the concept. So the back story is, humans killed each other with nanobots rather than nukes, and, much like the world of Fallout, they live in underground bunkers called silos. And also like Fallout (more so the games), some of the silos run experiments. Some social, some scientific. They have a ton of strange rules, knowledge is forbidden, all that good stuff. The mystery I mentioned was about the first person on in the series sent outside “to clean.” The question was whether what he saw on the visor real or not. Once you know they’re gassed with the nanobots as soon as they step outside (there is zero radiation out there), that explains the show’s first mystery. “But he’s in a suit,” you think. That gets answered by the end of the first season. Hope you can still enjoy it!