I had to go to another data centre just outside London about 10 years ago with a colleague who had never been inside one - we had some colocation kit hosted there and were going to spend most of a day swapping some cards and checking things through the KVM. He looked at me really weirdly when I offered him ear defenders on the way there. He wasn't ready for the sensory overload - the noise, the heat, the movement of air, the artificial light, the slightly weird smell, it was all a lot. 3 hours in, he wanted out. Couldn't blame him, I wasn't far off myself.