Lim II went to a construction site in Kuwait, where he worked day and night for five months, but was not paid. His salary was sent straight to Pyongyang. Over the years, an estimated 150,000 North Korean men and women have been recruited and sent abroad to work for the ruling Kim family. Toiling in factories and on construction sites around the world, they have generated billions of dollars for the pariah state. Reporters in a documentary met defectors who confirmed that the cash earned overseas was going directly to fund the development of the country’s nuclear missile programme. A former high-ranking official spoke of Office 39, which manages thousands of companies and factories overseas and provides half of the country's gross domestic product. ‘Our main goal was to make foreign cash, and this foreign cash business is a complete secret.’