Chapter 28: The Assessment

The engineers arrived on April 7th, a Monday, on the morning flight from Tromsoe, three people carrying equipment cases and laptop bags and the particular expression of professionals who had studied the specifications and the data and the architectural drawings and who were now, for the first time, encountering the physical reality that the documents described, the translation from paper to rock, from schematic to mountain, from the controlled vocabulary of engineering reports to the uncontrolled fact of a tunnel carved into permafrost on an island at seventy-eight degrees north.

Dr. Ingrid Solheim was the team leader, a geotechnical engineer from the Norwegian University of Science and Technology in Trondheim, a woman in her mid-forties whose specialty was the thermal behavior of permafrost in the built environment, the intersection of frozen ground and human infrastructure, the discipline that asked: what happens when you build on ground that is frozen and the ground stops being frozen. She had published thirty-seven papers on the subject. She had consulted on the design of buildings and pipelines and roads across the Norwegian Arctic and the Russian Arctic and the Canadian Arctic, and she approached each project with the methodical thoroughness of a person who understood that the ground beneath the infrastructure was not a constant but a variable, not a foundation but a condition, a condition that depended on temperature and that temperature was, in the Arctic, no longer dependable.

With her were Per Eriksen, a mechanical engineer who specialized in industrial refrigeration systems, and Marta Dahl, a younger researcher who managed the thermal modeling, the computational simulations that predicted how the temperature would behave in the vault's chambers under various scenarios — the current scenario, the scenario with increased compressor capacity, the scenario with additional insulation, the scenario with a complete redesign of the cooling infrastructure, the scenarios that ranged from the conservative to the ambitious and that each carried a cost and a timeline and a set of assumptions about the rate of permafrost warming that were, themselves, uncertain, the models predicting the future based on data from the past, the assumption being that the trend would continue, that the warming would proceed, that the cold would retreat.

Astrid met them at the airport. She drove them to the office in the Land Cruiser, the same drive she had made with Fatima eighteen months ago, with the Ethiopian delegation three months ago, the road from the airport to the town now familiar enough that she drove it the way she walked through the tunnel, automatically, the attention free to observe the passengers rather than the route, to watch Dr. Solheim looking out the window at the landscape with the assessing gaze of an engineer who was reading the terrain the way a geologist read rock strata, the surface conditions telling a story about the subsurface conditions, the snow and the ice and the mud and the exposed rock each indicating something about the permafrost beneath, the thickness of the active layer, the stability of the ground, the thermal state of the earth that held the vault.

"The active layer is deep here," Dr. Solheim said, pointing to a section of road where the surface had subsided, a shallow depression in the gravel that Astrid drove over without comment because she drove over it every day and the depression had been there for two years, growing incrementally wider and deeper with each freeze-thaw cycle, the ground settling as the ice content in the upper permafrost melted and the soil compacted, the process called thermokarst, the landscape reshaping itself in response to the warming.

"It's been deepening since 2018," Astrid said. "The road crew fills it every summer. By October it's back."

Dr. Solheim made a note on her tablet. The note was the first of many. Over the next three days, her tablet would fill with notes and photographs and measurements, the data accumulating the way Lars's data accumulated, each observation a point in a picture that was being assembled piece by piece, the picture of the vault's thermal environment, the picture that would tell them what the vault needed and what the vault would cost and how long the vault could persist under current conditions and how long it could persist under improved conditions and what the gap was between the two and what was required to close the gap.

At the office, Lars was waiting. He had prepared the auxiliary monitoring room as a workspace for the engineers, the room cleared of storage boxes and fitted with a folding table and three chairs and an ethernet cable and a power strip and a whiteboard, the room adequate if not comfortable, the comfort irrelevant because the work would not be done in the room but in the mountain, in the tunnel, in the chambers, in the cold.

Lars shook hands with each engineer. The handshakes were brief and firm and professional, the greetings of people who shared a vocabulary, who understood each other's discipline, who would communicate in the language of systems and specifications and performance metrics, the language that Lars spoke fluently and that Astrid spoke competently and that was, in this context, the right language, the language that would produce the answers they needed.

"The data package is on the server," Lars said. "Sixteen years of temperature logs. Compressor performance history. Borehole readings from 2007 to present. The maintenance records are in the blue folder on the table."

Dr. Solheim nodded. "We'll review the data this afternoon. Tomorrow morning we go into the vault."

"I'll prepare the thermal suits," Lars said.

The data review took the rest of the day. Astrid sat with the engineers in the monitoring room while they worked through the files, the spreadsheets and graphs and charts that contained the vault's thermal history, the record of every temperature reading, every compressor cycle, every maintenance event, every deviation from the target, every correction, the complete chronicle of the vault's mechanical life, written in numbers and timestamps and the shorthand of facilities management that Lars had maintained with the meticulous attention that was his nature.

Marta built the initial model on her laptop, the thermal simulation that would serve as the baseline for their assessment. The model represented the vault in three dimensions — the tunnel, the antechamber, the three storage chambers, the surrounding rock, the permafrost, the active layer above, the surface conditions — each element assigned its thermal properties, the conductivity and the specific heat capacity and the density of the materials, the rock and the concrete and the air and the steel, each one contributing to the overall thermal behavior of the system, the complex interaction of heat transfer that determined the temperature in the chambers.

The model showed what the data showed: the vault was warming. The warming was slow, was fractional, was measured in tenths of degrees per year, but the warming was consistent and accelerating, the trend line climbing, the slope increasing, the permafrost's contribution to the cooling declining as the permafrost itself warmed. The compressors were compensating. The compressors were running at eighty-two percent capacity, up from seventy percent five years ago, the mechanical system working harder to maintain the temperature that the natural system was less able to maintain, the partnership between the mountain and the machine shifting, the mountain's share of the work decreasing, the machine's share increasing.

"At the current rate," Marta said, looking at the screen where the model's projections extended forward in time, the trend lines extrapolated, the future predicted by the past, "the compressors will reach full capacity in approximately eight years. After that, the chamber temperatures will begin to rise above minus eighteen unless the cooling system is upgraded."

Eight years. The number was the same number that Lars had estimated two years ago, the number that had seemed distant then and that seemed less distant now, the interval shortened by the two years that had passed, the future approaching at the rate of one year per year, the rate that no intervention could change, the rate that only preparation could address.

Per Eriksen examined the compressor specifications. He read the manufacturer's data sheets with the practiced eye of a mechanical engineer who had spent his career sizing and installing and maintaining refrigeration systems, the eye that could assess a compressor's remaining service life from the data the way Astrid could assess a seed's viability from the germination percentage, the diagnostic skill that came from years of practice, from the ten thousand observations that built the intuition that supplemented the engineering, the knowing that was not in the manual but in the hand and the ear and the judgment.

"The compressors are original," Per said. "2007 installation. Eighteen years of continuous operation. They're in good condition — the maintenance has been excellent — but the design is outdated. The refrigerant is R-404A, which is being phased out under the Kigali Amendment. The efficiency is lower than current systems by approximately twenty percent. A replacement system using R-449A or CO2 cascade technology would provide the same cooling at lower energy consumption and would have the capacity headroom you need."

"Cost?" Astrid said.

"For the compressor replacement alone, including installation and commissioning, approximately four to six million kroner. For the full system upgrade — compressors, condenser, piping, controls, additional insulation of the tunnel entrance — eight to twelve million. For the comprehensive package that includes expanded borehole monitoring, supplemental cooling capacity for the permafrost degradation scenario, and a twenty-year service contract, twelve to eighteen million."

The numbers hung in the room. Twelve to eighteen million kroner. The number was an investment, a commitment, a statement about the value of the thing being maintained, the one million two hundred and fourteen thousand seed samples in three chambers at minus eighteen degrees, the genetic heritage of ten thousand years of agriculture, the insurance policy against the loss of crop diversity, the backup that existed for the eventuality that no one wanted and that the warming climate was making more likely, the eventuality of crop failure, of variety loss, of the erosion of the genetic base that supported the world's food production.

The investment was large. The thing it protected was larger. The ratio between the cost and the value was, Astrid knew, favorable by any measure, the twelve to eighteen million kroner a fraction of a fraction of the economic value of the crop diversity the vault contained, the crop diversity that supported an agricultural sector worth trillions, that fed eight billion people, that was the foundation of every economy and every society on earth. But the ratio did not matter if the people who controlled the funding did not understand it, if the number was presented without the context, if the cost was visible and the value was not.

The next morning they went into the vault. The walk through the tunnel was silent except for the sound of their boots on the concrete and the hum of the ventilation and the distant, rhythmic pulse of the compressors, the sounds that Astrid knew the way she knew her own breathing, the sounds that had accompanied four thousand, three hundred and forty-seven passages through this tunnel, the number having accumulated during the months since her return from Bergen, each passage adding to the count, each passage the same and each passage different, the tunnel unchanging and the person walking through it changing, the person bringing to each passage the experience of all the previous passages and the experience of the day and the experience of the year and the experience of the life.

Dr. Solheim stopped at the midpoint of the tunnel and placed her hand on the wall. The wall was cold, the temperature of the rock approximately minus four degrees at this point, the natural temperature of the permafrost at this depth, the temperature that the mountain maintained without mechanical assistance, the temperature that was the mountain's contribution to the vault's cooling, the contribution that was declining.

"The wall temperature has increased by 0.8 degrees since 2012," Lars said, reading from the data package that he had memorized in its entirety, the numbers available to him without reference to a file or a screen, the data stored in the human memory that supplemented the institutional memory, the backup that existed in Lars's mind and that was, in its way, as important as the backup that existed on the server in Tromsoe.

Dr. Solheim made a note. She took a thermal reading with her handheld device. She confirmed Lars's number: minus 4.2. The original design specification had assumed minus 5.0 at this location. The difference was 0.8 degrees, and 0.8 degrees was not a number that the body could detect but was a number that the vault could feel, the vault's sensitivity to temperature more acute than a human body's sensitivity, the vault's tolerance narrower, the vault's requirements more precise, the vault needing what the vault needed and the mountain providing less of it each year.

They spent three hours in the chambers. Per inspected the compressors, the condensers, the piping, the electrical connections, the control systems, the physical infrastructure of the cooling that supplemented the mountain's cooling, the mechanical systems that made up the difference between what the permafrost provided and what the seeds required. Marta recorded temperature readings at twenty-four positions in each chamber, the data points that would calibrate her thermal model, the measurements that would transform the simulation from an approximation into a representation, the model becoming more accurate with each data point, each point a piece of the puzzle, each piece narrowing the gap between what the model predicted and what the reality was.

Dr. Solheim examined the rock. She examined the concrete. She examined the boundary between them, the interface where the constructed interior met the natural mountain, the surface where the two systems — the human and the geological — were in contact, the surface through which the heat transferred, the surface that was the vault's true skin, the boundary between the maintained and the natural, between the controlled and the uncontrolled, between the minus eighteen that the compressors produced and the minus four that the permafrost provided, the gradient that drove the heat flow, the gradient that was changing.

At the end of the third day, Dr. Solheim presented her preliminary findings in the monitoring room. Lars stood by the whiteboard. Astrid sat at the table. Kari had joined them, her interest in the vault's infrastructure a natural extension of her interest in the vault's contents, the cryopreservationist's concern for the conditions that the cryopreservation depended on.

"The vault is sound," Dr. Solheim said. "The structure is intact. The chambers are well-maintained. The mechanical systems are functioning within acceptable parameters. The maintenance" — she looked at Lars — "is exemplary."

Lars's face did not change. Exemplary was a word that Lars would have applied to a well-calibrated compressor, not to himself, and the compliment, directed at his work, was received as data rather than praise, a measurement of performance that confirmed the performance was within specification.

"The challenge is the permafrost," Dr. Solheim continued. "The warming trend is clear and accelerating. At current rates, the permafrost temperature at chamber depth will cross minus three degrees within ten years. At minus three degrees, the mountain's contribution to cooling is significantly reduced, and the compressors will need to provide nearly all of the refrigeration. This is within the capacity of an upgraded system. But it changes the nature of the facility. The vault was designed as a passively cooled structure with mechanical supplementation. It will become an actively cooled structure with passive supplementation. The mountain will still help. The mountain will help less."

She paused. The pause was the pause of an engineer who was about to deliver the conclusion, the number, the answer to the question that the assessment had been designed to answer.

"Our recommendation is the comprehensive upgrade. New compressor system with CO2 cascade technology. Enhanced insulation at the tunnel entrance. Expanded borehole monitoring network. Supplemental cooling loops embedded in the chamber walls. Total estimated cost: fifteen point two million kroner. Implementation timeline: eighteen months from approval. Projected operational life of the upgraded system: forty years, with periodic maintenance and component replacement."

Fifteen point two million kroner. Forty years. The numbers were specific, were the product of measurement and calculation and professional judgment, were the best estimate of what the vault needed and how long the investment would last. And forty years was both a long time and a short time — long enough for the investment to be justified, short enough to be within the planning horizon of the institution, short enough to require another assessment in forty years, another investment, another generation of engineers walking through the tunnel with their instruments and their tablets and their thermal cameras, another generation making the same determination: the vault is worth maintaining, the seeds are worth preserving, the future is worth the cost.

Astrid thanked the engineers. She walked them to the airport on the third evening, the drive through the April light that was now extending to eighteen hours per day, the landscape emerging from the winter dark into the spring brightness with the speed that the Arctic demanded, the transition compressed into weeks rather than months, the snow retreating up the mountainsides, the exposed ground appearing, dark and wet, the active layer beginning its annual thaw, the surface softening, the frozen ground releasing its hold on the winter.

She returned to the office. Lars was still there, at his desk, reading through the engineers' preliminary report, a document that he would study with the same attention he gave to the vault's temperature logs, each page read and annotated and filed, each recommendation noted, each cost item considered, the institutional process of absorbing the assessment's findings and translating them into action, the translation that was Lars's contribution, the maintenance man converting the engineers' recommendations into the practical plan that would be implemented in the tunnel and the chambers and the mechanical rooms where the work was done.

"Fifteen point two million," Lars said, looking up from the report.

"I'll draft the funding request for NordGen and the ministry."

"I can have the compressor room ready for the new equipment in six weeks."

This was Lars. The cost was fifteen point two million and the institutional approval might take a year and the funding might take two years and Lars was ready in six weeks. The preparation preceding the approval, the readiness preceding the decision, the maintenance man always one step ahead of the institution, the systems always prepared for the upgrade that the institution had not yet sanctioned, the vault always ready for the future that had not yet arrived.

Astrid looked at him and felt the specific, quiet gratitude that she felt for Lars, the gratitude that was not sentimental but professional, the gratitude of a person who understood what it meant to work beside someone who cared about the same thing you cared about and who demonstrated the caring not through words but through the daily, meticulous, unglamorous practice of maintenance, the checking and the logging and the adjusting and the preparing, the work that kept the temperature at minus eighteen and the seeds viable and the future possible.

"Thank you, Lars," she said.

"The vault needs it," he said, and the sentence was the sentence it always was, Lars expressing care through the facility, the person speaking through the system, and Astrid heard it and understood it and the understanding was warm and quiet and sufficient.