Doctors in the Death Zone

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This two-part special follows a team of doctors conducting a series of groundbreaking experiments as they climb Everest, the world's highest peak.

From their laboratory tents, pitched in -25°C conditions, the experts use their own bodies for medical tests. They push themselves to the limit to better understand the human body's behaviour in a low-oxygen environment.

The team hopes their work will lead to new, life-saving treatments for intensive care patients suffering from hypoxia, a shortage of oxygen in the body.