Most explorers are famous for their successes and triumphs, but Antarctic explorer Sir Ernest Shackleton never met his ultimate goal of crossing the Antarctic continent. Instead, he is best known for an expedition that took a horrible turn for the worse. In January 1915, as Shackleton and his crew of 27 men sailed the Endurance through the pack ice of the Weddell Sea, the temperature suddenly plummeted. The slushy water surrounding the ship froze into a solid block of ice, trapping Endurance in ...