In mid-September 1977, Kosmos 954, a Soviet surveillance satellite, crashed into northern Canada after spiraling out of control. The satellite contained a nuclear reactor, which meant the crash scattered nuclear waste over thousands of square miles, according to reports from the Canadian government. Following the crash, the US and Canada sent out overflights to find the debris in an area totaling 48,000 square miles, but only 0.1 percent of the hazardous fuel was ever recovered.