From the archive record
Everested negotiate a large bergschrund with seracs above it, as they exit the Khumbu icefall for a higher camp, en route Camp I on Everest or Sagarmatha. A bergschrund (from the German for mountain cleft) is a crevasse that forms where a moving glacier ice separates from the stagnant ice or firn above. It is often a serious obstacle for mountaineers, who sometimes abbreviate "bergschrund" to "schrund". In a corrie or cirque, the bergschrund is positioned at the rear, parallel to the back wall of the corrie. It is caused by the rotational movement of the glacier. In a longitudinal glacier, the bergschrund is at the top end of the glacier at a right angle to the flow of the glacier. It is caused by the downwards flow of the glacier. Bergschrunds extend to the bedrock and can have a depth of