Endurance was the three-masted barquentine in which Sir Ernest Shackleton and a crew of 27 men sailed for the Antarctic on the 1914–1917 Imperial Trans-Antarctic Expedition. The ship, originally named Polaris, was built at Framnæs shipyard and launched in 1912 from Sandefjord in Norway. After her commissioners could no longer pay the shipyard, the ship was bought by Shackleton in January 1914 for the expedition, which would be her first voyage.

Source: Wikipedia