When Hitler took over Austria in 1938, Perutz's parents managed to escape to Switzerland, but they had lost all of their money. As a result, Perutz lost their financial support. With his ability to ski, experience in mountaineering since childhood and his knowledge of crystals, Perutz was accepted as a member of a three-man team to study the conversion of snow into ice in Swiss glaciers in the summer of 1938. His resulting article for the "Proceedings of the Royal Society" made him known as an expert on glaciers.