The book series is often referred to as the "Silo" trilogy.

Thank you for pointing this out, but the phrase "one-off" is correct and fits the article's context.

In season 2's episode 2, Mark recalls he specifically identified Gemma's body after she died.

There's a farm at level 122 in Silo 18. The survivors of Silo 17 might have survived on the food from their Silo's farm before the water flooded level 122.

I believe Eater mentions Chase and Tess had Teddy soon after they got together.