Comment by TenaciousValor

Milwaukee, WI is building a Deep Tunnel project as well. It's certainly not as large as Chicago's, but the need is similar (city built on swampland). They are, after all, neighboring cities on Lake Michigan.

https://www.mmsd.com/what-we-do/wastewater-treatment/deep-tu...

https://www.scientificamerican.com/article/sewer-diving-milw...