I wouldn't say it is that niche.
There are quite some stories where it might apply.
For example "Kumo ga nani desu ka", the "Metro" books, you could even apply "Journey to the middle of the earth" from Jules Verne.
"Dungeon ni deai" might as well work, since much revolves around heading inside the dungeon the town was built above.
I haven't read it, but "The Shaman that Couldn’t Become a Hero" might as well fit. "Swarm queen" on this site is sadly on hiatus, but got many readers.
There was also the game "arx fatalis".
I think there is some fascination going for a setting which is more like a labyrinth than free space. There is claustrophobic suspense as well as safety through bunker feel. I think it has some charme seeing a world developing in an enclosed space.