Fire crews search Lake Catherine nearby the 43100 block of North Andyville Lane in unincorporated Antioch for a man who went swimming and did not resurface Saturday afternoon. | Photo: Joe Shuman/J. Shuman Photography (2023)

A second day of search efforts ended Sunday without results after a swimmer jumped off a boat into Lake Catherine near Antioch and went missing Saturday afternoon.

The Lake County Sheriff’s Office and Antioch Fire Protection District responded around 3:50 p.m. Saturday to the area of the 43100 block of North Andyville Lane in unincorporated Antioch for a water rescue.

Lake County Sheriff’s Office Deputy Chief Christopher Covelli said the Lake County Sheriff’s Marine Unit was told that a man jumped into the water and did not resurface.

A preliminary investigation shows a 52-year-old Mount Prospect man jumped off of a pontoon boat to swim.

Fire crews search Lake Catherine nearby the 43100 block of North Andyville Lane in unincorporated Antioch for a man who went swimming and did not resurface Saturday afternoon. | Photo: Max Weingardt

The boat, which was in between Channel Lake and Lake Catherine, was being operated by the man’s adult son.

The 52-year-old man briefly resurfaced but then fell below the water surface and was not seen again, Covelli said.

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The Mutual Aid Box Alarm System (MABAS) was activated to the box alarm level to bring numerous fire department boats and divers to the scene.

Fire crews from well over a dozen departments in Lake County and McHenry County responded to the alarm.

Sheriff’s marine unit boats and fire department boats searched the lake with sonar for approximately eight hours Saturday.

Fire crews search Lake Catherine nearby the 43100 block of North Andyville Lane in unincorporated Antioch for a man who went swimming and did not resurface Saturday afternoon. | Photo: Joe Shuman/J. Shuman Photography (2023)

The water in the area they are searching is approximately 30 feet deep, Covelli said.

They called off the search at midnight and resumed around 6 a.m. Sunday.

The second day of searches ended around 3:15 p.m. Sunday, Covelli said.

Crews have searched for over 17 hours combined but so far have been unable to locate the man.