Vanished Northwest Passage Arctic Expedition

In 1845, Sir John Franklin commanded two ships on an expedition to find a Northwest Passage from England through the Arctic and over to Asia. If successful, the route would be a faster way to get goods from Asia to Europe and back. But success was not on the cards for Franklin's expedition. Only recently, the sunken ships were discovered in the icy Arctic waters. What happened to Franklin and his men, and what messages did they leave behind?