The CSL Laurentien, a 740-foot Canadian laker, approached the Duluth Aerial Lift Bridge on Thursday engulfed in sea smoke.

Ready to load iron ore pellets, the laker arrived in subzero temperatures, which didn’t stop visitors from bracing the cold to photograph the ship’s arrival.

Sea smoke, also known as steam fog, frost smoke, water smoke, sea mist and steam mist, according to the American Meteorological Society, is “fog formed when water vapor is added to air that is much colder than the vapor’s source.”

This smoke happens most often when very cold air drifts across very warm water.

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