Royal Collection Trust/© Her Majesty Queen Elizabeth II 2014
The ship was the nucleus of a pressure wave
The masts of "Endurance" barely visible behind large hummocks of ice.
Pressure waves are caused by the effects of wind and current on sea ice in a confined space. Endurance was stuck fast in thick pack ice in a large, enclosed bay; the huge sheets of ice were forced together like a vice. The ship, trapped in the middle, stood no chance.