The annual airing of the 2-1/2 hour documentary We’re Holding Our Own: The Sinking of the Edmund Fitzgerald will be tonight at 7 p.m. on KUWS-FM (91.3 Superior, 102.9 Ashland). The ore carrier sank in eastern Lake Superior with no distress calls, no witnesses and most tragically, no survivors. This doc was produced by Wisconsin Public Radio over a five-year period and aired November 10, 1995 on the 20th anniversary of its sinking. Two-and-a-half hours seems like a long time, but it moves pretty fast and doesn’t have Gordon Lightfoot’s song all over it.