Author and underwater explorer Valerie van Heest commemorates the 75th anniversary of the tragic Armistice Day Blizzard of 1940 in which five ships and 67 sailors were lost. She and the dive team from Michigan Shipwreck Research Associates examine the wrecks of the Novadoc, Davock, and Anna Minch, all lost off Pentwater within a few miles of each other, and provide insight into what caused these massive freighters to sink when others survived the storm.