Günter Oskar Dyhrenfurth (12 November 1886 – 14 April 1975) was a German-born, German and Swiss mountaineer, geologist and Himalayan explorer.
This expedition made the first ascent of Sia Kangri and some of its sub-peaks and provided detailed information about the accessibility of the 8000ers Gasherbrum I and II.
The first ascent of Gasherbrum I in 1958 was accomplished via the route proposed by Dyhrenfurth following the so-called IHE-spur and the SE-ridge.
[2][3] His son Norman G. Dyhrenfurth was also a mountaineer and became an important expedition leader and film maker.
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