In this new half-hour documentary, Detroit Public TV’s Great Lakes Bureau examines the controversy surrounding the Line 5 pipeline built by Enbridge Inc., a pipeline that was constructed and placed on the lakebed between Michigan’s Lower and Upper Peninsula more than a half century ago. It operates under the water near the Mackinac Bridge in a spot that’s considered one of the most scenic areas of the Great Lakes and is known for its strong currents between Lake Michigan and Lake Huron.