Forty-five years ago, a joint Indo-US espionage mission lost five kilograms of plutonium in the Himalayas. It’s still missing—but the government has decided to ignore the ongoing threat. Reportage Security Forty-five years ago, a joint Indo-US espionage mission lost five kilograms of plutonium in the Himalayas. It’s still missing—but the government has decided to ignore the ongoing threat.