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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Iron Mountain’s underground data-center strategy is no longer a futuristic proposal. The company announced its move into underground colocation in 2013, using a former limestone mine in Boyers, Pennsylvania. As of August 2026, Iron Mountain lists operating underground facilities in Western Pennsylvania and Kansas City, combining below-ground construction with modern power, cooling, connectivity, security, and disaster-recovery services.
The concept is compelling, but “underground” does not mean indestructible. Its value comes from a carefully engineered combination of rock protection, controlled access, stable temperatures, redundant utilities, and a location suitable for commercial data-center operations.
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From records storage to underground colocation
Iron Mountain was historically associated with storing paper records, tapes, film, and other physical information assets. In a May 2013 announcement, the company described a broader expansion into colocation and wholesale data-center services.
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- PCI & HIPPA and EIA/ECA-310-E compliant
The original report described a proof-of-concept space called Room 48, along with historical deployments for Marriott and government agencies. Those details belong to the 2013 expansion and should not be confused with current capacity or customer status.
The mine beneath Boyers
Iron Mountain’s flagship Western Pennsylvania facility, designated WPA-1, occupies a former limestone mine approximately 220 feet below ground. It is not an isolated military bunker: it is a commercial, multi-tenant data center near a major metropolitan area, with carrier connectivity and controlled access for customers and service personnel.
Iron Mountain’s current facility page lists a 315-acre campus, 330,000 square feet of raised-floor colocation space, and 15.5 MW of total power capacity. It also describes N+1 power and cooling, A/B power feeds, more than 10 connectivity providers, and geothermal cooling using water from an underground reservoir of approximately 100 acres.
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These are Iron Mountain’s published specifications. Buyers should confirm available rather than planned capacity, the definition of each power figure, and the infrastructure assigned to a particular suite or deployment.
Why put a data center underground?
Physical separation from surface hazards
Surrounding rock creates additional separation from severe weather, vehicle impact, unauthorized access, and some external blast risks. The underground setting can also reduce the number of practical access routes and make the site easier to protect as a controlled campus.
That is an advantage, not a guarantee. Underground construction does not eliminate risks from groundwater, internal fire, regional power failure, fiber cuts, equipment failure, insider activity, or cyberattack.
More stable temperatures
Below-ground rock moderates temperature swings. Iron Mountain says some of its underground environments have ambient temperatures as low as approximately 52°F (11°C). A stable, relatively cool environment can reduce the burden placed on mechanical cooling systems, particularly compared with a fully exposed above-ground building.
Reservoir-assisted cooling
At Boyers, water associated with an underground reservoir can act as a cooling resource or heat sink. The surrounding rock and water help reduce the cooling load, but the facility still requires engineered cooling equipment, controls, monitoring, maintenance, and redundancy.
The accurate description is naturally assisted or geothermal cooling, not cooling-free operation. Modern servers generate substantial heat, and a resilient facility must continue controlling temperature and humidity during equipment failures, unusual loads, and maintenance events.
Large, robust spaces
Former mine workings can provide substantial enclosed volume and high structural capacity. Iron Mountain has used strong language about the floor-load and scalability potential of its underground sites, but phrases such as “nearly unlimited” should be treated as marketing descriptions rather than literal engineering specifications.
Usable loading depends on the specific cavern, slab, raised floor, rack arrangement, equipment weight, vibration requirements, and structural design. A high-density deployment still requires a room-by-room engineering review.
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- Keep critical network equipment secure: glass door and side panels are lockable to prevent unauthorized access; Front door can be installed on either side of the front of the cabinet to satisfy your door swing orientation preference
- Easy equipment configuration: Fully adjustable mounting rails and numbered U positions, with square holes for easy equipment mounting with top and bottom punchout panels for easy cable access
- Durability: Made of high quality cold rolled steel holds up to 110lb (50kg) (Easy Assembly Required)
- PCI & HIPPA and EIA/ECA-310-E compliant
How the cooling and building systems work together
- The surrounding geology moderates temperature. Rock reduces rapid changes in outdoor temperature.
- Underground water can provide a cooling resource. At WPA-1, Iron Mountain describes geothermal cooling using water from an underground reservoir.
- Mechanical systems remain part of the design. Pumps, heat exchangers, air-handling equipment, controls, and backup systems are still required.
- Redundancy is essential. Iron Mountain lists N+1 cooling at WPA-1 and KCM-1, meaning the system is designed with at least one additional component beyond the minimum required capacity.
For a construction or facilities assessment, the important questions are not simply whether a site is cool. They include the cooling-water path, filtration and treatment, heat-rejection method, groundwater controls, humidity range, failure modes, maintenance access, and the performance boundary used for any efficiency metric.
Iron Mountain’s current underground footprint
| Facility | Iron Mountain’s current published details |
|---|---|
| Western Pennsylvania / WPA-1 | 330,000 sq. ft. of raised-floor colocation space; 15.5 MW total power capacity; 315-acre campus; approximately 220 feet underground; N+1 power and cooling; A/B power feeds; geothermal cooling using an underground reservoir; 10+ connectivity providers. |
| Kansas City / KCM-1 | 50,000 sq. ft. facility; 3.9 MW potential power capacity; 22-acre secure campus; approximately 110 feet below the surface; 13,000 sq. ft. of data-hall space; 2N electrical redundancy; N+1 cooling; five on-site carriers listed on the facility page. |
See the WPA-1 facility page and KCM-1 facility page for the current published descriptions.
The figures have changed over time. The 2013 report described the Pennsylvania complex as a 145-acre records-storage facility with up to 10 MW of critical power. The current page lists a 315-acre campus and 15.5 MW of total power capacity. These may reflect later expansion, a broader campus boundary, or different definitions. They should not be compared as though they were identical measurements.
Underground sites are only one part of Iron Mountain’s much larger portfolio. Its data-center portfolio includes conventional above-ground facilities and locations across North America, Europe, and Asia.
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What customers are actually buying
A customer generally leases infrastructure within a managed facility, not an entire mine. The Pennsylvania offering includes:
- Colocation cabinets.
- Dedicated cages.
- Private suites.
- Raised-floor and slab deployments.
- High-density solutions.
- Carrier-neutral connectivity.
- Backup and disaster-recovery services.
- Remote facility support and related operational services.
The wider Boyers environment also supports records storage, media and archival services, digitization, and secure physical-data handling. Those services are related to Iron Mountain’s information-management heritage, but they are operationally distinct from running customer servers and network equipment.
Typical customers include financial-services companies, healthcare and life-sciences organizations, government agencies, SaaS providers, media organizations, and enterprises that need a secure disaster-recovery location. A company already using Iron Mountain for physical records or media may also value the ability to coordinate physical information management with digital infrastructure.
Security, resilience, and compliance are different things
Being underground contributes mainly to physical and environmental protection. Iron Mountain’s Pennsylvania page lists controls including multifactor authentication, metal detectors, vehicle inspection stations, and 24/7 on-site security personnel.
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A buyer should assess the offering across five separate categories:
- Physical security: access control, guards, visitor procedures, vehicle screening, surveillance, and delivery controls.
- Environmental resilience: protection against surface weather, water intrusion, fire, smoke, humidity, and temperature excursions.
- Operational resilience: utility redundancy, generators, cooling redundancy, monitoring, maintenance, and staffing.
- Cybersecurity: identity management, encryption, segmentation, endpoint protection, logging, incident response, and customer-side controls.
- Compliance: the specific certifications, reports, authorizations, scope, facility, service, and audit period that apply to the proposed workload.
Iron Mountain references frameworks and requirements including HIPAA, FISMA High, FedRAMP, PCI DSS, ISO 27001, and SOC 2 Type II. A portfolio-level compliance page is not a substitute for facility-specific documentation and contractual review.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.The limits of the underground model
One secure building is not geographic redundancy
A site can be highly protected and still be affected by a regional utility outage, fiber disruption, extreme weather, legal event, labor issue, or operational failure. A serious disaster-recovery design should consider a second geographically separated site, immutable or offline backups, recovery-point and recovery-time objectives, and regular restoration testing.
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Groundwater and flooding remain engineering issues
Underground facilities must manage drainage, groundwater, humidity, water intrusion, pumping, fire suppression, and equipment placement. A prospective customer should ask about flood zones within the mine, sump and pump redundancy, leak detection, waterproofing, and procedures for loss of pumping capacity.
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Large underground spaces create specific requirements for detection, suppression, ventilation, smoke control, evacuation, emergency communications, and firefighter access. Rock may provide separation from some external hazards, but it does not automatically make internal fire response easier.
Connectivity still determines suitability
Carrier neutrality is useful, but the relevant question is whether the actual providers and routes meet the customer’s needs. Confirm route diversity, entrance diversity, cross-connect pricing, cloud on-ramps, internet transit, and latency to users, offices, cloud regions, and the primary data center.
Power labels can be misleading
“Total power capacity,” “potential capacity,” “critical power,” and customer IT load are not interchangeable. Buyers must establish what is installed, available now, reserved, expandable, and contractually guaranteed. Rack density, A/B feeds, generator runtime, fuel arrangements, utility constraints, and expansion schedules matter more than a single headline MW number.
Renewable matching requires precise wording
Iron Mountain says it matches electricity consumption with renewable energy from verified clean-energy sources and has described a longer-term goal of 24/7 carbon-free energy by 2040. “100% matched renewable power” is not the same as saying every electron consumed at the facility is physically renewable at every hour. The sustainability information should be read with that distinction in mind.
How to evaluate an underground data center
For a construction, facilities, or infrastructure team, request evidence rather than relying on the spectacle of the mine.
- What IT load is available today, and how much is reserved for expansion?
- What is the power density per rack and the guaranteed A/B or 2N configuration?
- Which systems are N+1, and which are 2N?
- How are groundwater, drainage, pumping, humidity, and water intrusion managed?
- What fire detection, suppression, smoke-control, evacuation, and emergency-access systems are installed?
- What is the actual PUE, and what measurement boundary and reporting period does it use?
- What generators, fuel storage, testing, and refueling arrangements support the site?
- Which carriers are available, and are entrances and routes physically diverse?
- What cloud connectivity, cross-connects, remote hands, and maintenance services are offered?
- Which compliance reports apply to this facility and this service?
- What are the minimum commitment, deployment lead time, migration requirements, and exit costs?
- How will the site fit into a two-site recovery architecture, and when was restoration last tested?
Pricing is quote-based on the official pages reviewed as of August 16, 2026. Expect the commercial proposal to depend on cabinet or cage size, allocated power, density, contract term, connectivity, remote hands, deployment assistance, and security or compliance requirements. A site tour and technical due diligence are essential.
Who should consider it—and who should not?
Underground colocation is worth considering when physical protection, controlled access, disaster recovery, regulated workloads, archival data, or integration with information-management services are important. It may be particularly relevant to government, financial services, healthcare, life sciences, and media organizations.
It is less attractive when the buyer needs many distributed locations, extremely low latency to another region, transparent self-service pricing, massive hyperscale expansion, or primarily cloud-native managed services. In those cases, a conventional global colocation provider, hyperscale campus, cloud platform, or separate recovery region may be a better fit.
Potential alternatives include Equinix for interconnection and metropolitan network density, Digital Realty for broad global coverage and large deployments, QTS for campus-scale enterprise, government, and hyperscale requirements, and CyrusOne for large enterprise and hyperscale deployments. These are architectural alternatives, not equivalent underground facilities.
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