German climber plans to make another shot at Everest without sherpas or oxygen

Kobusch is trying to summit Everest in the winter without the aid of sherpas or oxygen. Photo: Daniel Hug/Jost Kobusch/dpa

Jost Kobusch knows that his chances of making it to the top are very slim, and also that it is possible he may never return.

The chances of him being rescued if something goes terribly wrong are practically nil, according to American mountaineer and blogger Alan Arnette.