听力原文： Tomaz Humor had spent nearly a week huddled on a shelf of the cliff six thousand meters up Nanga Parbat. He was held in his unsteady and dangerous position by ice screws and ropes. The temperature inside his sleeping bag was minus five degree Celsius. Repeated attempts to rescue him failed because of snowstorms and avalanches. But on Wednesday two Pakistani military helicopters managed to fly close enough to his perch for one of them to dangle a line to him. What has happened to Tomaz Humar?