The idea to plant a nuclear powered sensor in the Himalayas was hatched at a Washington cocktail party, or so the story goes. National Geographic Society staff photographer Barry Bishop was a regular on the party circuit, where his impressive resume had made him a celebrity of sorts. His defining moment had been atop Mount Everest during the first US expedition to the summit in the spring of 1963. Blasted by the cold and delirious from lack of oxygen, he left its slope with his feet frozen a sickly black and eventually lost his toes.After that ordeal, the thirty-two-year-old Bishop was spending much of his time behind a desk in Washington, where he shared a fateful cocktail with US Air Force Chief of Staff Curtis LeMay in the summer of 1964. When Bishop spoke of the unique vantage point from atop the Himalayas — with an unfettered view across Chinese-occupied Tibet — LeMay was all ears. North of the Tibetan plateau was the expansive and arid salt deserts of China’s Xinjiang province, where the Beijing government had sited testing ranges for its fledgling nuclear weapons and missile programmes.Cold War YearsCIA-IB plansThere remained the issue of selling the idea to the Indians. Because the CIA had been handling joint covert programmes for the past two years, the project was turned over to the agency. And since ARC director Kao had been the primary point of contact for joint projects, it was with him that the CIA first broached the subject. The gravity of the plan caught him off guard. ‘‘I was not authorised to sanction such an important mission,’’ recalled Kao, ‘‘so I passed the message to B N Mullik.’’By that time, Mullik had lost his primary patron in Nehru (the prime minister had passed away in spring) and had been replaced as director of the IB. Still, he retained control over covert paramilitary projects focused against China. A mission in the Himalayas fell under his purview, and after listening to the concept, he was agreeable in theory.The Two Teams