Fairly dull Nazi propaganda documentary about an expedition to Tibet by a German team of scientists. Lots of emphasis on concepts like victory, stamina and the will to die for collective goals, and on the similarities between the peoples of the Himalayas and the Aryan race. Not without some phrenology and other pseudo-science, of course.
The goal of the voyage was not to bring home an entertaining film for the German people, but to look for the Ur-Arier, the original Aryan, one of Himmler's esoteric follies. Please note that this is barely touched upon in Geheimnis Tibet.
More here (German).