Cosmos 954: An Ugly Death: Space age "difficulty"? It could have been a nuclear disaster.

The article reports on the Soviet Union's spy satellite Cosmos 954 which crashed in a remote Canadian wilderness area. It narrates that the satellite, which contained a nuclear reactor in the system, started to sag in its orbit during December 1977, and crashed into the atmosphere with probable reentry point in North America based on the computer analysis of the North American Air Defense Command (NORAD). It states that military intelligence from both Russia and the U.S. knew that Cosmos 954 was in fact a satellite that tracks U.S. submarines, and that search attempts by the U.S. and Canada became more of a pursuit of military intelligence rather than of environmental conservation.