Neighbors say the sewage system had been failing in the neighborhood. The men had been working in a catch basin.
A special collapse and rescue squad was brought in, and rescuers had to dig the men out by hand.
"They were trying to help. They weren't in much pain. We did give them both oxygen and IV fluids, which is the normal process that we do. We sent the paramedics down to put lines in them, and they were in good spirits the whole time," Chief of Special Operations Michael Fox.
Both workers were taken to Advocate Illinois Masonic Medical Center.