November 21, 1915: After sailing more than ten thousand miles from Norway to the Weddell Sea, the Endurance finally succumbed to the surrounding ice. Shackleton and his crew watched in silence as the ships stern disappeared into the frigid sea, then spent five months marooned on the ice in its wake. Subsequent missions to find the Endurance failed over the next century. Bound, director of exploration on the 2019 and 2022 expeditions to locate the...