CHICAGO (CBS) — A man is dead after drowning in Lake Michigan offshore from Rogers Park early Sunday.

Divers, police Marine Unit members, and a helicopter, were called around 7:30 a.m. to Tobey Prinz Beach Park, on the lake at the mouth of Pratt Boulevard, after a man in his 30s went underwater a few blocks north on the lake at Greenleaf Avenue and never resurfaced.

READ MORE: Simeon Career Academy Student Shot And Killed Just Blocks From School

First responders did not locate the body until responding to a second distress call a few hours later.

READ MORE: State Data Show One Chicago Nursing Home Has Fewer Than 1 Percent Of Staff Vaccinated Against COVID-19

In that second call, two people were having trouble in the water, but made it to the pier and were able to get to shore safely.

MORE NEWS: Some Schools In Oswego Forced To Go Remote After Dozens Of Bus Drivers Call In Sick

The Chicago Park District issued a swim advisory Sunday because of rough conditions.

CBS 2 Chicago Staff