What do soldiers do differently at the forbidding heights of the Siachen Glacier? How do they adapt to the harshest weather conditions on the planet? At minus 50°C and altitudes in excess of 18,000 feet how does the human spirit endure? What does it take for helicopters to fly in such extreme conditions? What demands does the weather make on both man and machine ? Operation Meghdoot was launched by the Indian Army on the barren and icy heights of the Siachen Glacier to thwart Pakistan from gaining control of this strategically located glacier. For three decades since then, Indian and Pakistani troops have been locked in an undeclared war on the world’s highest – and coldest - battlefield.