On Sept. 28, Facebook CEO Mark Zuckerberg offered an inside look at the company's massive data center in Lulea, Sweden.

On Sept. 28, Facebook CEO Mark Zuckerberg offered an inside look at the company's massive data center in Lulea, Sweden. The facility is located approximately 70 miles from the Arctic Circle, allowing it to maintain an power usage effectiveness rate of 1.07.

Zuckerberg posted a dozen images of the data center's internal features, many of which seem to match its sparse Nordic surroundings.

Facebook opened the location back in 2013, touting its innovative 100 percent sustainable infrastructure. However, only employees at the social media giant have seen its interiors - until now. Zuckerberg's photographs depict stark, industrial spaces clad in cold steel. The vast central server room holds hundreds of evenly placed black cabinets. There are no exposed wires or permanent maintenance terminals - just concrete, metal and processing power.

These austere fixtures were developed as a part of Facebook's Open Compute Project, an industry-wide initiative meant to facilitate the development of streamlined, high-performing data processing and storage devices. However, like conventional servers, the machines that occupy the Lulea outpost still emit considerable heat, so much in fact that huge fans must run around the clock to cool them down, according to TechCrunch. But in winter months, when outdoor temperatures dip far below zero, the cabinets return the favor, warming the entire facility.

Currently, 150 employees work at the data center. And, due to the efficient design of the equipment inside, a single technician alone can manage up to 25,000 servers.

"There's a beauty in all of this," Site Manager Joel Kjellgren told TechCrunch. "It's like a massive and very well-orchestrated machine, where everything works in concert and allows people across the planet to communicate and share in an incredibly efficient way."