Three hundred feet below the surface of Jones Island lies deep tunnels that prevent pollution from getting into Lake Michigan. This week, Nate and Bobby got a tour of the deep tunnel pump room and see how the Milwaukee Metropolitan Sewerage District keeps the city's water clean. <br /><br />Read more at OnMilwaukee: https://onmilwaukee.com/articles/deep-tunnel-pump-room

It's not poop! An inside look at how Milorganite fertilizer is made

Every week, Radio Milwaukee’s Nate Imig and OnMilwaukee’s Bobby Tanzilo dig into the buildings and architectural features that help retain the city’s sense of history while it builds for the future.