Ernest Shackleton (1874–1922) led an unsuccessful expedition to cross Antarctica in 1914. When his ship, aptly named Endurance, became trapped in heavy ice in the Weddell Sea, it became an endurance race just to survive. With no means of communicating with the rest of the world, Shackleton and his crew used lifeboats to make the journey to the nearest shore—Elephant Island. While most of the crew stayed behind on the island, Shackleton and five crewmen spent two weeks traveling 800 miles across the ocean to South Georgia to get help for those left behind. The “failed” expedition became a victorious entry…