🇳🇵The most terrible section on the way to Everest is considered to be the Khumbu icefall. 

The Khumbu icefall flows down from the southern slopes of Mount Everest. It is located at an altitude of 5486 meters above sea level - just above the base camp. The fact is that the glacier is constantly in motion, and collapses often occur there. And climbers use ladders to overcome deep cracks.
Google Earth gives a good idea of this icefall:
https://earth.google.com/web/search/Khumbu+Icefall