A spokeswoman at St. Anthony's Hospital in Rockford says 20-year-old William Piper remains in serious condition Thursday.
Rescue workers were called to the bin in Mount Carroll, about 120 miles west of Chicago, around 10 a.m. Wednesday. They cut holes in the side of the bin and drained thousands of pounds of corn to get to the men.
Haasbach LLC, which owns the bin, did not immediately return a call seeking comment.