This summer a mega ice avalanche has swept down on the Tibetan plateau. In the Aru Range in northwestern Tibet a whole glacier tongue broke off and tumbled down into the valley. Scientists say it was one of the largest ice avalanches ever recorded. According to the Chinese authorities this natural event, which already occurred on 17 July, killed nine Tibetan herders. More than 350 sheep and 110 yaks were buried under the ice and rock masses. The American space agency NASA now published satellite images which show the dimension: The ice covered an area of ten square kilometers, the lake down in the valley was colored white and the debris piled up 30 meters in some places. The cause of the collapse is still unclear. “Climate change is causing more glacial hazards through mechanisms we do not fully understand,” said the Chinese glaciologist Tian Lide. “There is an urgent need for more monitoring and research efforts, especially in populated areas in high mountains.”

I called the Swiss scientist Samuel Nussbaumer. The 35-year-old glaciologist is working for the World Glacier Monitoring Service (WGMS) in Zurich, which is observing and analyzing the fluctuation of glaciers worldwide.

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It was a hot, but from the climbers’ perspective a meager summer in the Karakoram: Most expeditions left Pakistan without summit successes. The German “Huberbuam” Thomas and Alexander, the Swiss Dani Arnold and the Austrian Mario Walder also returned empty-handed, but alive and “in one piece” – which was not a matter of course considering their experiences at the Latok group. Thomas, aged 48, the elder of the Huber brothers, told me the story.

Thomas, this summer you actually wanted to tackle the North Face of the 7,145-meter-high Latok I which has not yet been climbed. This did not happen. Why?

We have seen the North Face only from afar. We realized pretty soon that is was impossible to climb the wall under these conditions. It would have been possible to tackle the North Ridge. But this did not happen too, because another mountain battered us so that we lost our motivation and courage to push ourselves to the absolute limit again.

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The decision was not taken ​​lightly. “After a careful weighing up of the risks – we had climbed up the glacier in deep snow for two hours again – I have decided to abandon the expedition“, Ralf Dujmovits writes in his final report of his winter expedition to Nanga Parbat. His Polish companion Darek Zaluski is supporting the decision, says Ralf: “I had expected a certain level of risks climbing up the Diamir side in winter, especially on the Messner Route. But not these incalculable risks that I ‘m not willing to take. The serious accident on K 2 in 2008, when a part of the large serac above the bottleneck broke, was one of many examples of accidents by ice avalanches that could have been prevented.” In 2008 eleven climbers had lost their lives on the second highest mountain of the world.

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The cloud cover has broken on Nanga Parbat. Snowfall had stopped overnight as predicted by Austrain meteoroligist Charly Gabl, writes Ralf Dujmovits in an email from basecamp. 40 centimeters of fresh snow have fallen. The climbers had two hours of sunshine. For the first time in days Darek Zaluski and Ralf could see the whole Diamir-Face: “Observing it our fear of being in quite a high risk when climbing up the Messner-Route was very obvious. On the huge serac-barrier are two big ice towers which are isolated from the rest. And they don’t look very stable.”

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Trail-breaking for nothing. “It has been snowing all day”, says Ralf Dujmovits in the basecamp on the Diamir side of Nanga Parbat. “We certainly have between 35 and 40 centimeter of fresh snow.” On his way to the toilet tent he slipped into a snowdrift and had trouble to get out of it. Ralf and his Polish companion Darek Zaluski know that they will have to break trail again when they climb up to the depot at 5500 meters which they had made yesterday. The fresh snow is also increasing the risk of avalanches. “If the wind doesn’t blow the snow out of the slopes, it will be impossible.”

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