For More Protection, Some Data Centers Are Headed Underground Bluebird Networks' underground data center in Springfield, Missouri Underground data centers may call to mind ultra-secure, massive government facilities like Cheyenne Mountain Complex in Colorado, a bunker complex built under 2,000 feet of granite that hosts defense intelligence and operations, built to withstand a nuclear blast. Of course, few organizations need quite that level of security. But with extreme weather events growing more common — floods, severe storms and other disasters have all accelerated over the past several decades, causing trillions of dollars in economic damage — underground data centers present unique advantages for a certain type of customer.