CHICAGO (CBS) — Chicago firefighters suspended their search for a teenager who was swept into Lake Michigan on Thursday, when a large wave crashed ashore at Diversey Harbor.

Fire Department spokesman Larry Langford said two friends were walking along the lakefront at Diversey Harbor when a large wave swept an 18-year-old male into the water. The victim’s friend tried to help him out of the water, but was unable to do so.

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Four Fire Department divers went into the water to search for the teen, but suspended the search after an hour, because of “extreme turbulence.”

“It was a very difficult dive. There was zero visibility. And with this wave action out here, it really caused a lot of difficulty during the dive,” Chicago Fire Department Deputy District Chief Don Dorneker tells CBS 2.

It was unclear when the search would resume.

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Although winds have died down a bit since Wednesday’s blizzard, according to the National Weather Service, occasional waves of up to 15 feet continued to pound the southern tip of Lake Michigan on Friday.