A lot of sci fi and even paranoid government programs (eg. COG protocols), explore the ideas of humanity hiding out in underground bunkers to survive the self induced apocalypse de jour. How long could something such as this actually last before everyone perishes? (My thoughts in comments).
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Unknown. The times we have actually tried to do it, it failed within years.
However - miniature sealed glass biomes can and have lasted on the order of centuries. Those rely on the sun however, and a different sort of biome would be required to live in darkness - but there are certainly plenty of living things which thrive in such environments. It’s all about the balance and symbiosis of them.
If you knew that the earth itself is a closed system, would you suspect that it could be done on a smaller scale too? This is generally my view.