Having no engineering or architecture background, the information can be hard to take in, but the way it was written was simple and engaging enough for me to understand. I like how it was presented. Various systems such as water and sewage system, electrical system, telephone system, train system, etc. were divided. It focuses on one system or topic at a time. The explanation immediately followed by the illustration really helped too. The illustrations definitely help in visualizing what were just discussed.
I love the illustration style, it was not boring. Although there were still times when it felt too complicated, especially when it started from building foundations where it was relatively easy, and then went to the systems that were more complex. Still, it was written in a way easy to understand and just makes sense.
Overall, it was a cool, easy and informative read about the systems underground that help our cities function.