DULUTH -- For more than 90 years it was a secret Lake Superior wouldn't tell: the deep, dark place where it had entombed the 239-foot Great Lakes freighter Benjamin Noble and its crew of 20 men. Its captain, 31-year-old John Eisenhardt of Milwaukee, worried in a letter to his sister that the vessel was overloaded, making it unstable, according to "Lake Superior Shipwrecks" by Julius F. Wolff. The trip was Eisenhardt's first as captain. It became his last. As the vessel crossed Lake Superior, one of the worst spring storms ever to strike the big lake was gathering -- with...