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Curiosities

The Finns will repopulate the Earth

By May 6, 2022January 6th, 2023No Comments

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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