the Hillary Step; named for the first person to summit Mt. Everest, it was the last obstacle from the top. Evidently the 2015 Nepal earthquake caused the collapse.
This from the Guardian (UK).

In this pre-2015 view of Mt. Everest, the high point is the summit; to the right of the summit, the southeast ridge slopes down to the Hillary Step, and then rises up to the South Summit. The yellow band is its namesake geological feature stretching across the mountain
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