Operation Morning Light was the joint Canadian/American recovery of the residue of the Soviet satellite Cosmos 954, which crashed near Great Slave Lake in January, 1978. The debris included radioactive portions of the satellite’s power plant and other items of interest to Western intelligence agencies. Cosmos 954 was a Soviet Radar Ocean Reconnaissance Satellite (RORSAT) with an onboard nuclear reactor. ... Mackenzie River drainage basin showing Great Slave Lakes position in the Western Canadian Arctic Great Slave Lake (French: Grand lac des Esclaves) is the second largest lake in the Northwest Territories of Canada (behind Great Bear Lake), the deepest lake in North America at 614 meters (2,015 ft. ...