In 1955 Thorak began working as the government veterinary officer in the Northern Territory where he was based in Darwin, and the family lived in Fannie Bay.[3] He was soon promoted to district veterinary officers and was responsible for all animal health related matters in the region. In this role he was involved in a program to eradicate bovine pleuropneumonia in the region, supervising the many small abattoirs in operation and reviving the live export trade of cattle and buffalo to Asia. In order to promote live export he frequently travelled to Hong Kong and Manila on behalf of the government; he was often accompanied by his family. Additionally, in the absence, of private veterinarians he treated privately owned domestic animals.[1]
Thorak was a very popular personality in Darwin and was highly regarded by his friends a colleagues and members of the community.[1]
In January 1960 the Thorak family, including Rolf who was 15, planned to travel to Portuguese Timor for a few days of holidays and Thorak's wife, Edith, had to be convinced to take the trip.[3] They boarded their plane, a De Havilland Heron, a 14-seater Portuguese aircraft, at Darwin Airport on 26 January 1960 and, about 150 kilometres (93 mi) north of Darwin they struck turbulence and the pilot reported large thunder approaching. There was no further contact with the plane and it is believed to have disintegrated or crashed into the sea.[1] It is believed that the pilot had difficulty with poor visibility which he did not have the training for.[2]
A massive sea rescue was performed, with the assistance of the Royal Australian Air Force, and it was then the biggest sea search operation in the Northern Territory. This search located some debris, which had been washed up on the Bathurst and Melville Islands but the plane and passengers were never found.[1][3]