THIS rare 1914 photograph of polar explorer Sir Ernest Shackleton on his ship Endurance is lot 109 at Sotheby’s sale online sale of Travel, Atlases, Maps and Photographs which runs until the afternoon of May 24. It is estimated at £5,000-7,000. Frank Hurley was the official photograph on Shackleton’s Imperial Trans Antarctic Expedition which set out in 1914 and was marooned until August 1916.