Antarctica is the southernmost continent on Earth. For most of human history, it was unexplored. Antarctica is surrounded by thick sea ice. Winter temperatures dip below –70 degrees Fahrenheit. But in the early 1900s, adventurers repeatedly tried to explore the frozen continent.
Shackleton was one of them. By 1910, he had already taken part in two Antarctic expeditions. His third began when the Endurance left England in August 1914.
As the ship neared Antarctica, the trip became more difficult for Shackleton and his crew. They slowly sailed through cracks in the frozen Weddell Sea. Eventually, the Endurance could no longer move. As one crew member later put it, the ship was “frozen, like an almond in the middle of a chocolate bar.”
The crew was forced to leave the ship. They took food, equipment, and three small lifeboats with them and set up camp on the sea ice. The goal of the expedition had changed—from exploration to survival.