The spectacular natural beauty of the Himalayas draws three quarters of a million people to Nepal every year. But the same forces that created these mountains also have the power to destroy. In April this year a violent earthquake struck the country, triggering deadly landslides and avalanches across the Himalayas. This programme, made with footage shot by people who were there, tells the story of climbers and trekkers trapped in remote corners of the mountains. What should have been the trip of a lifetime quickly became a nightmare. Who lived, and who died, was a matter of chance.