ANTIOCH, Ill. (WLS) -- Crews are searching for a man who went missing in the Fox Lake in north suburban Antioch on Monday evening.

The Lake County Sheriff's Office said two men were in a boat, test-driving it, when they apparently turned too quickly and were thrown off of the boat.

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A passing boat rescued one of the men, but the other went underwater, the sheriff's office said.

Crews are actively searching for him, the sheriff's office said in a statement at 7:45 p.m.

First responders are calling this a recovery mission.

Further information was not immediately available.

This is a developing story. Check back with ABC7 for updates.

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