New hints for Duluth's harbor rust mystery
May 12, 2008 - MPR’s Bob Kelleher reports that Lake Superior's low water in 2007’ revealed something disturbing…gaping rusted holes in much of the underwater steel in the Duluth-Superior harbor. The aggressive corrosion, discovered just a couple of years ago, has caused extensive damage below the water line. The cause is still a mystery, but studies have begun to identify some leading suspects.