Subsequent recovery efforts, named Operation Morning Light, by a joint American-Canadian team swept the area by foot and air until the spring ice breakup in April made further searches impractical. They were ultimately able to recover 12 larger pieces of the satellite. These pieces displayed radioactivity of up to 1.1 sieverts per hour, yet they only comprised an estimated 1% of the fuel. For these recovery efforts, the Canadian Government billed the Soviet Union $6,041,174.70 for actual expenses and additional compensation for future unpredicted expenses; the U.S.S.R. eventually paid the sum of 3 million dollars.
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