| Name | InfoBunker, LLC | The Bunker | Montgomery Westland | Cavern Technologies | Iron Mountain The Underground |
| Location | Des Moines, Iowa* | Dover, UK | Montgomery, Tex. | Lenexa, Kan. | Butler County, Penn.* |
| In business since | 2006 | 1999 | 2007 | 2007 | Opened by National Storage in 1954. Acquired by Iron Mountain 1998. |
| Security /access control | Biometric; keypad; pan, tilt and zoom cameras; door event and camera logging | CCTV, dogs, guards, fence | Gated, with access control card, biometrics and a 24x7 security guard | Security guard, biometric scan, smart card access and motion detection alarms | 24-hour armed guards, visitor escorts, magnetometer, x-ray scanner, closed-circuit television, badge access and other physical and electronic measures for securing the mine's perimeter and vaults |
| Distance underground (feet) | 50 | 100 | 60 | 125 | 220 |
| Ceiling height in data center space (feet) | 16 | 12 to 50 | 10 | 16 to 18 | 15 (10 feet from raised floor to dropped ceiling) |
| Original use | Military communications bunker | Royal Air Force military bunker | Private bunker designed to survive a nuclear attack. Complex built in 1982 by Louis Kung (Nephew of Madam Chang Kai Shek) as a residence and headquarters for his oil company, including a secret, 40,000 square foot nuclear fallout shelter. The office building uses bulletproof glass on the first floor and reception area and 3-inch concrete walls with fold-down steel gun ports to protect the bunker 60 feet below. | Limestone mine originally developed by an asphalt company that used the materials in road pavement | Limestone mine |
| Total data center space (square feet) | 34,000 | 50,000 | 28,000 plus 90,000 of office space in a hardened, above-ground building. | 40,000 | 60,000 |
| Total space in facility | 65,000 | 60,000 | 28,000 | 3 million | 145 acres developed; 1,000 acres total |
| Data center clients include | Insurance company, telephone company, teaching hospital, financial services, e-commerce, security
monitoring/surveillance, veterinary, county government | Banking, mission critical Web applications, online trading | NASA/T-Systems, Aker Solutions, Continental Airlines, Houston Chronicle, Express Jet | Healthcare, insurance, universities, technology, manufacturing, professional services | Marriott International Inc., Iron Mountain, three U.S. government agencies |
| Number of hosted primary or backup data centers | 2 | 50+ | 13 | 26 | 5 |
| Services offered | Leased data center space, disaster recovery space, wholesale bandwidth | Fully managed platforms, partly managed platforms, co-location | Disaster recovery/business continuity, co-location and managed services | Data center space leasing, design, construction and management | Data center leasing, design, construction and maintenance services |
| Distance from nearest large city | Des Moines, about 45 miles* | Canterbury, 10 miles; London, 60 miles | Houston, 40 miles | Kansas City, 15 miles | Pittsburgh, 55 miles |
| Location of cooling system, includng cooling towers | Underground | Underground | Above and below ground. All cooling towers above ground in secure facility. | Air cooled systems located underground. Cooling towers located outside
| Chillers located above ground to take advantage of "free cooling." Pumps located underground. |
| Location of generators and fuel tanks | Underground | Above ground and below ground | Two below ground, four above ground. All fuel tanks buried topside. | Underground | Underground |
*Declined to cite exact location/disatance for security reasons.
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