How Russia’s thermosyphons keep permafrost cities from sinking

In the Siberian city of Norilsk, tower blocks are lifted on stilts, stairways jut out as if suspended mid-step, and pipes snake overhead like knotted metal creepers so the heat cannot thaw the earth beneath. Residents pass by without glancing up. To them, this is simply how a permafrost city is built.

Beneath their boots, the surface is barely “ground” in the usual sense. It is a locked-up blend of ice, soil and ancient vegetation that is slowly, quietly shifting. Even so, many buildings remain upright-almost in defiance. The reason is a peculiar piece of engineering that sounds almost backwards in a warming world.

Russia is attempting to hold back climate impacts with vast underground freezers.

How do you keep a city from sinking?

On Yakutsk’s outskirts-often described as the coldest city on Earth-rows of dull concrete blocks sit above a thicket of steel piles. In between those piles, thick metal tubes can be seen driven into the ground at a slant. At first glance they resemble abandoned plumbing. In truth, they are doing the crucial work: steadily pulling heat out of the soil so the permafrost stays frozen.

Those tubes are thermosyphons: passive, sealed pipes partly charged with a refrigerant. When winter arrives, the fluid inside condenses in the cold air, draws warmth out of the ground, and leaves the soil rigidly frozen. They require no electricity. So long as winters remain cold enough, the system functions like an unseen framework beneath the city, keeping structures supported as the climate changes.

Move a few hundred metres to older buildings that lack thermosyphons and the contrast is immediate. Doors start to jam and won’t shut cleanly. Cracks appear at corners and along walls. A playground slopes just enough that a ball always rolls the same way. In places like this, the boundary between “stabilised” and “slowly giving way” can be no wider than the edge of a plot.

Norilsk, Yakutsk, Vorkuta, parts of Magadan and many smaller settlements all sit on permafrost that is beginning to thaw. In some neighbourhoods, Russian scientists caution that up to a quarter of buildings already show deformation. Yet a striking number of blocks built-or later upgraded-with frozen foundations still look impressively true, their concrete staying level even as temperatures climb.

One estimate by Russian and international researchers put the potential cost of permafrost-related infrastructure damage at hundreds of billions of dollars by 2050. Roads warp, pipelines twist and storage tanks lean as ice lenses melt and firm ground turns soft. Against that reality, keeping the soil frozen under critical structures is not a quirky trick. It is a survival measure for entire cities that might otherwise become impossible to live in.

Engineers across Siberia often explain it with a simple image: build a house on a huge slab of ice. While the ice remains solid, the house is safe; when it begins to melt, everything shifts. Thermosyphons follow the same hard logic: if the planet is warming, then the ground must be deliberately cooled. You counter melting with more cold.

At heart it is about controlling heat flow. Permafrost thaws when the balance tips and more warmth moves down into the ground than cold moves up. Thermosyphons reverse that. In winter, they behave like chimneys for heat, lifting it out of the soil and releasing it into the air. Deeper layers can stay several degrees colder than they otherwise would. It is as though a permanent winter has been installed beneath a building, even while the seasons above grow gentler.

The strange art of freezing the ground on purpose

Keeping buildings steady on thawing permafrost begins well before construction starts. Surveyors drill into the soil, extract long frozen cores, and chart precisely where ice-rich layers sit. An architect in Moscow may sketch straight avenues and neat blocks, but a geologist in Yakutsk then redraws the plan around what can realistically be kept frozen. In the end, the ground dictates the city’s layout.

Thermosyphons are positioned where they matter most-sometimes in dense grids under a foundation, sometimes only beneath vulnerable corners. On certain sites, contractors even freeze the ground before building: large refrigeration units circulate coolant through pipes to harden the soil into a dependable base. Workers describe the oddness of constructing in summer on earth that machinery has pushed back into winter, the equipment droning somewhere nearby.

Once a building is occupied, the approach turns into continuous watchfulness. Engineers track temperatures with sensors buried in the ground. If the permafrost warms, additional pipes can be installed or foundations strengthened. It is unglamorous work. Nobody shares photos online of an unchanging basement. Yet that unremarkable stability is what stops thousands of people waking to a sloping floor and doors that suddenly refuse to open.

On diagrams, the system looks tidy. In daily life, it brings practical trade-offs. Buildings raised on piles can feel draughty. Children learn early not to linger beneath certain staircases, where the gaps are just large enough to be dangerous. Snow eddies under lifted structures instead of piling neatly. Small routines and habits shift because the city does not quite meet the earth.

These frozen foundations also create a kind of double existence. Above ground, life runs as it does anywhere-buses, shops, pupils hurrying to school. Below, a carefully managed cold war is being fought against thermodynamics. Speak to local engineers over tea in cramped offices and you hear the same low concern: how long the winters will remain cold enough for their passive systems to work, without needing machines that demand power and constant maintenance.

What this frozen gamble says about our future

Anyone who has watched a road split after a severe winter has seen how sensitive buildings and infrastructure are to subtle ground movement. On permafrost, that “subtle” shift can become tens of centimetres when ice-rich layers thaw and slump. Freezing soil beneath a building is a way of declaring that this particular patch of Earth must not move, whatever the climate does.

From far away, that can sound like obstinacy. On the ground, it reads more like care. These northern settlements are not arbitrary dots on a map. They support mines, gas fields, ports and military bases. More simply, they are home-places where families have buried parents and watched children take first steps on frozen pavements. Walking away would mean uprooting whole communities. Frozen foundations buy time-for households, industries and governments still unsure what a warmer future will demand.

The uncomfortable reality is that the strategy contains its own contradictions. Preserving permafrost under oil and gas infrastructure, for example, props up the very sectors that drive global warming. Arctic pipelines and drilling sites often depend on the same ground-freezing methods that keep Yakutsk’s flats straight. The loop can feel surreal: fossil fuels heat the planet, warming thaws permafrost, thaw threatens infrastructure, and then ever more cooling is used to protect it.

Researchers also warn that as permafrost melts, enormous carbon stores trapped for millennia can be released as CO₂ and methane. So the stakes extend beyond cracked walls and tilting blocks. If frozen foundations fail, the worst-case outcomes could include additional greenhouse gases entering the atmosphere-from destabilised soils and ruptured pipelines. Cities such as Norilsk are fighting not only for their skylines, but for a fragile boundary between stable ice and released carbon.

There is a quiet irony in all of this. The better we become at defending human structures on permafrost, the more directly we are forced to confront the human choices that helped trigger the thaw. The engineering is extraordinary. The setting is unsettling.

Learning from Russia’s frozen cities

One approach used by Russian engineers is almost deceptively straightforward: design buildings so cold air can flow beneath them. Instead of sitting on the soil, structures are supported on piles driven down into stable permafrost layers. The open space underneath acts like a natural freezer, sweeping away heat that would otherwise seep down from warmed rooms above.

Thermosyphons provide a safeguard-another layer of protection. Some contemporary designs combine passive pipes with active cooling when conditions require it. In the most extreme cases, major industrial facilities are set on artificially frozen “rafts” maintained at a steady sub-zero temperature throughout the year. The core rule remains the same: keep warmth away from the ground at all costs. Heat belongs in homes, not in the soil that keeps those homes standing.

For planners in other cold regions-from Alaska to northern Canada-Russia’s experience serves as a real-time laboratory. It reveals which foundation choices tolerate unexpected warming, and which begin to fail after only a handful of warmer-than-usual summers. These cities become evidence in a global, increasingly practical debate: how do people continue living in places built for a climate that no longer holds?

At a personal level, residents’ advice often sounds less like engineering and more like emotion. They speak about tracking cracks as routinely as checking the forecast. They tell newcomers to pay attention to their floors, not only their views. And they describe a low-grade tension that comes from knowing the ground itself is caught in a race against time.

Most people recognise that household moment when a minor problem suggests something larger-a small drip that might mean the roof is failing. In Siberian cities, the same feeling is magnified. A sticking door can be the first sign that permafrost is shifting under an entire block. People learn to interpret these warnings almost as a second language, somewhere between folk knowledge and an engineer’s report.

Let’s be honest: almost nobody does this kind of checking every day. Most of us do not inspect foundations or monitor the temperature of the soil beneath our feet. Work is demanding, bills need paying, children must be collected. In Yakutsk or Norilsk, however, that awareness becomes part of ordinary life whether residents want it or not. The city teaches you to notice.

One engineer in Yakutsk summed it up plainly over coffee in his office, with cranes and frost-darkened concrete framed by the windows:

“We are not just freezing the ground,” he said. “We are freezing time. Every winter we win a few more years for these buildings, for these people. I don’t know what happens when winter can’t help us anymore.”

His words linger because they reach beyond any single place. They point to a wider tension many people feel, wherever they live:

• How long can we keep patching up the world we know, instead of changing how we live in it?
• Which places do we fight to keep, and which do we allow to slip away?
• What stories will future generations tell about the cities we chose to freeze in place?

A fragile miracle beneath our feet

Stand on a frozen street in Russia’s far north and nothing about the ground may feel unusual. Yet beneath the surface, metal pipes work silently with thermodynamic sleight of hand. Concrete piles grip ancient, hardened ice. Between them, pockets of warming soil push and sag-held back just enough for one more season, and then another.

That hidden contest reflects something broader. All of us live inside structures-physical, economic, emotional-designed for a climate that is now shifting. Russia’s attempt to freeze the ground under entire cities is a vivid, almost cinematic example of how far people will go to hold on. It is ingenious, effective and slightly unnerving, like strapping a giant bandage across a moving fault.

There is also a strangely hopeful element to the way engineers, scientists and residents cooperate. Children learn at school why buildings “float” above the ground. Local officials argue over budgets for additional thermosyphons. Neighbours trade stories about cracks that stopped spreading after reinforcements. A shared understanding takes root: the foundation of everyday life is not guaranteed-it is maintained.

Perhaps that is the message these frozen cities send outward. Our ground-literal and metaphorical-is changing. We can act as if nothing is happening, or we can practise the stubborn, detailed attention that keeps a city upright against the odds. The pipes under Norilsk and Yakutsk will not save the planet. They do something else: they show, in steel and ice, what it looks like when a society decides that quietly sinking is not an option.

Key point	Detail	Why it matters to the reader
Thermosyphons	Passive metal pipes that pull heat from the ground and keep permafrost frozen under buildings	Helps you understand the simple but powerful technology that stops entire cities from sinking
Raised foundations	Buildings are lifted on piles to separate warm structures from cold soil and allow air to circulate	Gives a clear picture of what climate-adapted architecture looks like in practice
Climate tension	Frozen foundations protect infrastructure while a warming climate threatens the permafrost below	Encourages reflection on the paradoxes of adapting to a crisis we also continue to fuel

FAQ:

• How exactly do Russia’s frozen foundations work? Most systems use thermosyphons: sealed tubes filled with a refrigerant that draws heat out of the soil in winter. Combined with raised buildings on piles, they keep the permafrost beneath key structures permanently below zero.
• Are these technologies used only in Russia? No. Comparable ground-freezing and thermosyphon systems are used in Alaska, Canada and other cold regions. Russia stands out because of the scale-entire cities, pipelines and industrial sites sit on managed permafrost.
• What happens if the climate gets too warm for thermosyphons? If winters are no longer cold enough, passive cooling weakens. Engineers may need active refrigeration, additional insulation or entirely new designs. Some locations could eventually become too unstable to inhabit safely.
• Is living on permafrost dangerous for residents? Most of the time, no. People work, children attend school and daily life continues. The risk typically shows up gradually: cracked walls, sloping floors, damaged pipes. The real danger comes when maintenance is delayed or when extreme thaw episodes move faster than structures were designed to handle.
• Could other countries learn from Russia’s approach? Yes. As more regions face thawing permafrost or unstable ground, Russian experience offers practical lessons on foundations, monitoring and long-term planning. The bigger question is whether others will act early-or wait until buildings begin to lean.

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