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by klyrs 1807 days ago
Flooding is a major problem with underground construction. Not the best as the ocean level rises. Air circulation is also a mess, because CO2 is heavier than oxygen. Evacuating a tall building is relatively easy; most people can go downstairs without a huge issue. Fleeing upstairs, on the other hand, is something fewer people can do. And once you get a blockade of people who can't make it, even the healthiest can get trapped.