The Finns will repopulate the Earth

With its brightly coloured slides, trampolines and tunnels, the soft play area at the Hakaniemi Arena, near the centre of Helsinki, looks much like any other. The difference is that it lies 25m below ground in a cavernous space hollowed out of the Precambrian bedrock beneath the city, and is designed to withstand nuclear, biological and chemical attacks.

From Marginal Revolution

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