When the Endurance was crushed by the ice of the Weddell Sea, it is on Elephant Island in the South Shetlands that Sir Ernest Shackleton and his crew sought refuge, floating on three small boats through mammoth icebergs and landing between steep cliffs. For 105 days, 22 members of the crew endured hardship as Shackleton pressed forth on a harrowing search for help. Here, expedition photographer, Frank Hurley, took his striking photo of the crew waving at Shackleton as he set off.