It was a cold morning on March 12, 2009. The sun had just begun to rise over the North Atlantic, casting a dull glow over the icy waters east of Newfoundland. The offshore oil fields of Hibernia and White Rose, bustling hubs of energy production, awaited their daily crew change. Eighteen men and women climbed aboard Cougar Flight 491, unaware that in less than an hour, their flight would become one of the most tragic aviation disasters in Canadian history.