This frame grab made Wednesday Jan. 9, 2013, was taken from APTN video provided by Yekaterina Achkasova, as her husband Denis Burakov and another man are seen inside a large plastic ball called a zorb, on Thursday, Jan. 3, 2013, while other man pushed it, at a winter sports venue at Donbay in the Caucasus Mountains of southern Russia. The zorb veered off course and sailed over a cliff, killing Burakov and leaving the other man badly injured. (AP Photo/Family photo provided by Yekaterina Achkasova, APTN)

Photo by: APTN

This frame grab made Wednesday Jan. 9, 2013, was taken from APTN video provided by Yekaterina Achkasova, as her husband Denis Burakov and another man are seen inside a large plastic ball called a zorb, on Thursday, Jan. 3, 2013, while other man pushed it, at a winter sports venue at Donbay in the Caucasus Mountains of southern Russia. The zorb veered off course and sailed over a cliff, killing Burakov and leaving the other man badly injured. (AP Photo/Family photo provided by Yekaterina Achkasova, APTN)