With the rise of the
Nazi party in Austria, Harrer became a member of the
SA, or
storm troopers as they came to be known in English, in October 1933. He held the rank of SA Oberscharführer (sergeant). He made no secret of his allegiance to National Socialism and was photographed with
Adolf Hitler. Austria was
absorbed into Germany in March 1938 and so he was part of a German expedition to
Nanga Parbat in the
Himalayas, in present-day
Pakistan occupied Kashmir in summer 1939. Harrer had joined the
SS and the
NSDAP in 1938.
After the 1997 release of film adaptation of
Seven Years in Tibet, questions were raised about Harrer's Nazi past and Harrer acknowledged that his membership of the party had been a "stupid mistake." Since he was out of the country almost continuously during the Nazi period, he was not involved in illegal actions.
Nonetheless, after the start of
World War II in 1939, Harrer was captured by
British colonial authorities as an enemy alien and
interned in
Dehradun, along with 1,000 other "enemy aliens", mostly civilians. He escaped on
May 10, 1944, with
Peter Aufschnaiter and two Germans, Hans Kopp and Bruno Treipel. They promptly made their way into the Himalayan foothills, which began within sight of the camp. As they were in constant fear of rearrest, they headed directly toward
Tibet, their route being north-northeast throughout, in as straight a line as possible. They transited
Mussoorie and
Landour, forded the Aglar river at Thatyur, crossed the Nag Tibba range via Deolsari, descended to Uttarkashi and eventually passed Harsil, Bhaironghati and Nelang. On
May 17, 1944, they crossed the Tsang Chok-la Pass (5,896 meters or 19,350 ft.) and entered Tibet. (They had considered heading for
Goa, then a Portuguese colony and thereby a
neutral port, but it was too far away.)