The world’s most super-designed data center
This underground data center has greenhouses, waterfalls, German submarine engines, simulated daylight and can withstand a hit from a hydrogen bomb. It looks like the secret HQ of a James Bond villain.
And it is real. It is a newly opened high-security data center run by one of Sweden’s largest ISPs, located in an old nuclear bunker deep below the bedrock of Stockholm city, sealed off from the world by entrance doors 40 cm thick (almost 16 inches).
(For the curious there is plenty of more information further down.)
Above: The space-themed conference room is suspended about the server hall.
Above left: View from the conference room (its floor is the surface of the Moon). Above right: Power equipment.
Above: The NOC is set in a cozy jungle setting. That light fog almost makes us think of cloud computing. Fog computing? 
Above: Artificial waterfalls and plenty of green plants adorn the halls.
Above left: The submarine engines used for backup power. Above right: Another view of the power equipment.
Above: This map shows the layout of the data center.
And here is what it used to look like
Credit to royalpingdom. More info.?? read here