Taking a deep dive in Helsinki’s subterranean metropolis | Helsinki holidays

The moon is an impostor. Swimming backstroke beneath its floor, I lookup at craggy hollows in shut aid. White rock undulates in all instructions, a forest of peaks rising subsequent to a desert of craters. Every time I trick myself into considering I’m someplace celestial, the sound of kids splashing brings me again to earth.

This isn’t any lunar panorama however Helsinki’s underground swimming corridor, excavated from granite bedrock and formally opened in 1993. These days, Itäkeskus uimahalli is without doubt one of the Finnish capital’s most visited leisure services, welcoming 400,000 individuals a yr. Local individuals mingle with vacationers, I’ll uncover, throughout per week exploring Helsinki’s subterranean metropolis.

My go to was one among 12 analysis journeys I remodeled three years to higher perceive how cities are being reimagined. It was a ebook, How to Build a City, for which I travelled to places which might be testing the frontiers of city dwelling in response to an more and more unsure world.

Many world cities characteristic a model under floor, however Helsinki’s is regarded as the one one reworked for peace. As urbanisation elevated the inhabitants, a extra environment friendly resolution was wanted for heating vegetation and telecoms cables. You might scatter them round in costly pockets of land, digging up the streets and sacrificing parks. Or you would tuck them away beneath floor degree, by including to bomb shelters first carved out in the course of the second world struggle.

And that’s what Helsinki did. By 2010, its metropolis council accepted the world’s first formally masterplanned underground metropolis, dwelling to tons of of huge human-made caves and tunnels as much as 90 metres deep. Itäkeskus pool was opened 17 years earlier than this house allocation plan was accepted.

In peacetime, the caves operate as procuring malls, playgrounds, a go-karting monitor and subway stations, all related by nearly 200 miles (293km) of tunnels. In the occasion of struggle, nonetheless, every may be reworked right into a bomb shelter, a part of a community able to accommodating 900,000 Finns.

Itäkeskus swimming corridor alone might home nearly 4,000 individuals. In lower than 48 hours it may be drained and fitted with decontamination showers. For the remainder of the time, there are not any clues as to its defence nature. Only the comforting hallmarks of the general public pool: the tang of chlorine in my nostril and the heat that cloaked my pores and skin.

I arrived in Helsinki on the morning of the spring solstice, though the bottom was nonetheless dusted with greying snow and I used to be grateful for the heated carriages on my 25-minute Metro experience from town centre. At Itäkeskus station, previous a college surrounded by Soviet-style tower blocks, silver birches trailed naked branches over automobiles. From the surface, a municipal glass constructing gave an uninspiring welcome, however inside, I discovered a distinct world solely.

A broad staircase swept me down steeply, framed by rocky, whitewashed partitions. After paying (entry to all 4 of Helsinki’s public swimming halls is €6 for adults and €3.30 for youngsters, making it in style with households in addition to budget-conscious travellers), I disrobed in altering rooms spun off from a cathedral-tall granite core. Signs have been in Finnish, however the house was simple for non-natives to navigate. Staff spoke glorious English.

At one aspect of the colossal hangar, males grimaced as they lowered themselves right into a triangle of freezing water. On the opposite, a postmodern dreamscape was revealed, a big pool lined in lavender, canary yellow and burgundy tiles, with large plastic triangles in cerulean and lilac suspended overhead. The solely home windows have been set right into a lifeguard’s tower subsequent to a waterfall that crammed the air with the roar of water in movement.

Swimming below the ersatz moon was an otherworldly expertise. After 50 lengths, I’d earned my reward. Included within the entry charge is entry to a gymnasium, which I didn’t go to, plus a sizzling tub, steam room and two saunas, which I did. A graphic on the door confirmed a swimming costume crossed out in purple and I gingerly eliminated mine, sliding into place on the bench and reminding myself that prudishness is a uniquely British affliction. Inside, it was so darkish I might barely make out different our bodies. The low gentle created the impact of a confession sales space.

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Around me, conversations bubbled in Finnish, American English and German. The quotidian particulars of dwelling emerged. I joined in, asking a stranger for dinner suggestions and whether or not I ought to courageous the plunge pool. If you don’t dwell on it, you would overlook the true objective of this place.

It was one thing I stored returning to over the next days as I wandered via experimental installations at Helsinki’s underground artwork museum Amos Rex (from €20; kids go free), whose antennae-like skylights popped up on concrete stalks from the pavement close to the chichi procuring district of Kluuvi. And within the Töölö neighbourhood’s beautiful Temppeliaukio church (€8; kids go free), half-buried in an enormous mound of rock.

All have been examples of a supremely responsive metropolis. All have been bomb shelters, too. Evidence that you would be able to design for the long run with verve and wonder. Helsinki exhibits it’s attainable to do all of it.

How to Build a City: Journeys into the Urban Future by Gabriella Bennett is revealed by Headline (£25). To help the Guardian purchase a duplicate at guardianbookshop.com. Delivery costs might apply.