Swimming safely in the Chicago River is now one giant step closer to reality, according to sanitary officials. Chicago Tonight details the new disinfection process making that possible.

Jay Shefsky visits the Thornton Quarry and goes to the bottom of Deep Tunnel to see where the water will flow into the new reservoir later this year.    

The Metropolitan Water Reclamation District of Greater Chicago is taking the residue of human waste from their water filtration process and transforming into a powerful soil additive/fertilizer that is used in parks, golf courses, and farms throughout the area.