No, you aren’t looking at James Bond’s secret cave from an upcoming film, but rather Pionen, a real-life data center. On interesting fact about Pionen is that it was a former civil defense center built in the White Mountains in Stockholm, Sweden in the 1970s to protect essential government functions from nuclear strike. Continue reading for two videos, more pictures, and additional information.

Pionen was transformed into a data center by Bhanof, a Swedish Internet service provider. Since it’s inside of a mountain, secured by a 40-centimeter thick door, and only reachable by an entrance tunnel, the data center is capable of withstanding a hydrogen bomb. On the interior, you’ll find fountains, greenhouses, simulated daylight and a huge salt water fish tank. Plus, it uses actual submarine engines as backup power generators.