A passing boat rescued one of the men, but the other went underwater, the sheriff's office said.
On Monday, two men were in a boat, test-driving it, when they apparently turned too quickly and were thrown off of the boat, the Lake County Sheriff's Office said
Crews continued recovery efforts at about 7:30 a.m. Tuesday.
Antioch fire officials told ABC7 they found a body at about 4 p.m. in Fox Lake.
On Wednesday, the Lake County Coroner's Office identified the body as 51-year-old Larry Suchowski of Gurnee. It was determined that the man drowned.