This great post-apocalyptic story could be described as a "vertical Snowpiercer," where the Ark that keeps alive the last seed of humankind doesn't travel perpetually around Earth but is placed inside it in a silo of 140+ levels. People live in there for centuries, divided more or less by the level of living and job description, and they are prohibited from even thinking about "out" with a penalty of "cleaning," i.e., getting out of the silo on the surface of Earth, where the atmosphere is deadly toxic. They wear a suit that disintegrates after a while to clean the sensors that transmit the view inside the silo. Things, of course, are about to change; a narration that variates successfully between fast and slow pace and carefully avoids dull exposition takes us on a violent, brutal, and at the same time, hopeful and sensitive journey in a new era of the silo. Characters are depicted as realistically as they can be, without black or white coloring. Not surprisingly, it has recently become a huge success as a TV series.
Can't wait to read the rest of the story!