One hundred years ago, on December 6, 1917, the French munitions ship Mont Blanc collided with the Belgian relief vessel Imo in the Halifax Harbour. At first, a small fire broke out aboard the Mont Blanc, which grew bigger crowds of people and emergency responders linded the shores of Halifax and Dartmouth to get a better look. Suddenly, the Mont Blanc's explosive cargo blew up, flattening homes and businesses, and triggering a tsunami. Amid...