Underground data centers can work, but making one reliably dry, cool, safe to enter, and practical to maintain is a demanding, site-specific engineering problem. Groundwater, rock conditions, cooling resources, emergency access, and the movement of heavy equipment all shape whether a site is viable. A successful mine conversion shows what is possible in the right location—not that digging a new facility underground is generally simpler or cheaper.
What makes underground data centers difficult to build?
The challenges are connected. A site’s geology and water conditions affect excavation, waterproofing, drainage, and long-term moisture control. Those decisions influence where equipment, shafts, cables, and service routes can go. Cooling may benefit from local groundwater, but only if the resource and the systems needed to use it are suitable. The December 2022 review of underground data centers identifies environmental control, energy use, cavern construction or conversion, and monitoring and prevention as major areas of concern.
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That means “underground” is not a single design choice with a standard solution. The feasibility of a particular project depends on the subsurface, the facility layout, the cooling approach, and how people and equipment will reach and operate the site over time.
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Water entering a facility can threaten equipment and disrupt operations, so a project needs a durable plan for waterproofing, drainage, and moisture management. Groundwater levels and flow, the condition and variability of rock, and the history of the site all matter. Planning guidance flags groundwater, permanent drainage, waterproofing, and geotechnical confirmation as key checks; these are site questions to investigate, not a universal design recipe.
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A third-party mirror of a 2011 BICSI text also warns that subgrade spaces raise water-infiltration concerns. Because that is an old, mirrored excerpt rather than a verified current standard, it should not be treated as a present-day code requirement.
Subsurface models can help reduce uncertainty before a design is settled. At a proposed hyperscale site in a historically mined area, Fugro describes combining ambient-noise tomography with existing geotechnical information to build a more continuous picture of underground conditions. That company case illustrates a method used on one site; it does not establish how well the method performs in every geology.
Does underground cooling solve the energy problem?
No. Underground location can provide a useful cooling resource, but it does not eliminate the need for a designed system. Wells or reservoirs, pumps, heat exchangers, controls, and sometimes supplementary chillers must work together. Water quality, treatment, supply, and discharge also need attention.
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Groundwater wells at Interxion
Geo says two 70-meter wells serve the Interxion project and estimates that they avoid 1,233 MWh of additional energy use per year. The figure is a vendor-reported estimate for that project, not a general forecast for underground data centers.
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A mine reservoir at Iron Mountain
The U.S. Department of Energy’s Better Buildings & Better Plants Initiative describes Iron Mountain’s Boyers facility as 200 feet underground in a former limestone mine, with a 35-acre reservoir. Its cooling system uses reservoir pumps, heat exchangers, building-loop pumps, and a supplementary surface chiller plant. DOE reports 34% PUE savings for this geothermal cooling system; the case page does not state a publication year. That result belongs to this specific installation and should not be read as the expected savings from underground siting alone.
Water impacts can matter above ground, too
Cooling-water challenges are not unique to underground facilities. The U.S. Environmental Protection Agency’s Quincy case describes mineral-rich groundwater creating equipment and wastewater-treatment issues, followed by the development of a reuse utility to recycle cooling water. The utility has operated since 2021; the EPA case study, accessed in 2026, estimates annual potable-water savings of 138 million gallons (522 million liters). Water reuse can address cooling-water impacts without putting a data center underground.
How do access, safety, and maintenance affect the design?
A facility must be buildable and operable, not just excavatable. Designers need to account for construction access and spoil removal, ventilation during construction, permanent routes for cables and equipment, smoke control, emergency egress, and fire-service access. Shafts and passageways also have to accommodate the delivery, eventual replacement, and removal of large equipment. These constraints can shape the layout and operating plan; their presence does not mean every underground project will fail.
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What does a successful underground data center prove?
Iron Mountain’s Boyers operation demonstrates that a data center can function in a former mine. Its existing limestone mine, large underground reservoir, and purpose-designed cooling plant are specific advantages—not evidence that a new excavation will be practical in arbitrary ground conditions.
Other mine-cooling work also begins with feasibility questions. Geosyntec’s Boone County project description focuses on hydrogeology, water flow, thermal behavior, and utility availability for mine-pool cooling. Together, these examples point to the importance of evaluating the actual site and cooling resource before treating underground construction as a solution.
How should a proposed site be evaluated?
Compare an underground option with a surface alternative using the conditions and operational needs that determine whether the project can work:
- Geology and groundwater: Confirm subsurface conditions, groundwater behavior, and the site’s history, including any mining.
- Excavation and construction: Assess excavation scope, construction access, ventilation, and how spoil will be handled.
- Water management: Plan waterproofing, permanent drainage, and long-term moisture control.
- Cooling and water impacts: Establish whether a well or reservoir is suitable, what equipment it needs, and how water quality, treatment, supply, and discharge will be managed.
- Life safety and access: Work through smoke control, emergency egress, fire-service access, and routes for people to reach the facility.
- Equipment and operations: Verify that shafts, cable paths, and service routes support installation, maintenance, and eventual equipment replacement.
- Long-term feasibility: Evaluate whether the site can be maintained safely and reliably over the facility’s operating life.
The cited material does not provide a matched cost comparison between underground and surface data centers. It therefore cannot establish a general cost premium, savings, or schedule impact for underground construction. Those outcomes depend on the specific site and design.
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