This underground data centre 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 centre 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 40cm thick
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