City Tunnels – Secret Passageways Under the City 

Chicago City Tunnels

City Tunnels – Secret Passageways Under the City. Many people don’t realize it, but Chicago is chock full of tunnels, at least downtown.

Chicago has been able to use tunnels to solve various infrastructure problems, thanks to an easily excavated layer of blue clay underlying the city. Even deeper flood control tunnels have been cut through bedrock, as part of the Deep Tunnel project.

1 Comment
  1. rewraw 2 years ago

    There are many level below my building. Always wanted to explore

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