 They departed in February 1957, without ever being told what "undesirable activities" he was guilty of.It is apparent, however, that the expulsion was the result of the direct intervention of Zhou Enlai, Prime Minister of China.During the seven years that Prince Peter spent with his wife in the Himalayas, he was able to collect "...a rich collection of artefacts and books, still and moving photography, sound recordings, ethnographic information as well as an astoundingly large set of physical anthropology data."