On April 12th, 1936, three men 141 feet underground in a Nova Scotia mine pulled the signal rope to bring down "the skip," and the whole mine shaft caved in on them. J. Frank Willis, the Canadian Radio Broadcasting Commission's only employee east of Montreal, sped to the scene and began a marathon broadcast that had listeners all over North America tuning in for a few minutes of coverage for 69 consecutive hours. The graphic coverage was carried by all 58 Canadian stations and 650 stations in the United States. Coverage of that disaster was eventually recognized as the outstanding radio news story of the first half of the 20th century. For a very detailed look at this event, go here.