Crevasses seen from the air
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Philip K Swartz - 1960-61 - South Pole Station - Antarcticans Database Project
As polar plateau snow and ice pass over mountain ridges, it is bent and cracks, like bending a soft cookie. A relatively thin layer of snow then bridges over the gaps hiding them from view on the ground and posing a major risk to overland parties. There have been episodes of a bridge breaking and a crevasse swallowing a large tractor.
Pictures from Philip K Swartz, overwinter, South Pole, 60-61