1874-1922 adventure antarctica arctic bravery british courage dedication discoveryandexploration endurance endurance(ship) epic-journey ernesthenry exploration exploration-of-the-unknown explorers extreme-conditions greatbritain historical historical-expedition imperialtrans-antarcticexpedition imperialtrans-antarcticexpedition(1914-1917) journeysshackleton leadership perseverance pictorialworks polar-exploration shipwreck survival teamwork travelshackleton true-story