Two snowmobilers die but five dug out of snow alive in Khakassia: video shows desperate rescue efforts to save tourists.
Hopes fade of finding 13 people, six weeks after Tyva Avia aircraft went missing in remote and mountainous region.
Private helicopter brought in to located Tyva Avia aircraft that had 13 people on board in remote Siberia.
Intense search reveals no sign of Mil Mi-8 lost early Saturday with 12 people on board.