Inside Sweden's Pionen data centre, a high-security bunker

The Peonin data center, located beneath 100 feet of bedrock in a former nuclear bunker, is known for housing sensitive information, including past WikiLeaks servers. It operates under Sweden's Free Speech Act, ensuring client data protection. The center features backup generators originally designed for German submarines. CEO John Carlin's design, inspired by 70s sci-fi films, includes plants sustained by grow lights, creating a unique 'computer meets plants' vibe. Despite its James Bond villain lair appearance, the center is run by a team of 15 senior technical staff.

What is the purpose of the simulated daylight and waterfall in the data center?

Describe the atmosphere of the Peonin data center as mentioned in the text.