A moulin - a shaft in the ice opened by melt water as it plunges into the depths of the glacier. Like the water running through it, the ice itself is constantly moving, flowing down the valley with unstoppable force. Alpine glaciers may seem immense, but they're dwarfed by those in the great ranges that divide the Indian subcontinent from Tibet. This is the boulder-strewn snout of the giant Baltoro glacier in the Karakoram mountains of Pakistan. It's the biggest mountain glacier on earth - 43 miles long and over three miles wide. This huge ice-filled valley is so large it's clearly visible from space. This is the greatest concentration of peaks over five miles high to be found anywhere on earth. They're the most dangerous mountains of all. K2 and her sister peaks have claimed more lives than any others.


这是冰川锅穴，冰川中融化的冰雪水流入冰层深处形成的直井。像流过冰面的水一样，冰层本身也一直在运动，以不可阻挡的力量沿山谷移动。阿尔卑斯山冰川看起来好像非常巨大，但是和分隔印度次大陆与西藏的那些高山冰川相比实在是相形见绌。 这是位于喀喇昆仑山地区漂石遍布的巨大的保特罗冰川的顶端。它是地球上最大的高山冰川，长约70公里，宽约5公里。这个充满冰雪的山谷如此巨大，你在太空中都可以清楚地看到。这一地区是世界上8000米以上的山峰最集中的地方。它们是世界上最危险的山峰。它们吞噬的生命比任何山峰都要多。