In an underground parking lot beneath central Helsinki, there’s a lot more than just spaces for cars. Behind 40-centimetre-thick blast doors are a set of snaking tunnels and broad caverns, hacked into the bedrock, 25 to 30 metres below street level.
The tunnels are empty, but for dusty piles of stainless steel sinks and the frames of 2000 sets of collapsible triple-bunk beds. The caverns are used for indoor soccer pitches and a children’s soft-play.