Former SAS solder Chris Ryan tells the harrowing story of the disastrous Bravo Two Zero mission as the military documentary series continues.

In January 1991, Ryan and seven other men were dropped into the Iraqi desert to spy on a supply route carrying SCUD missile launchers.

But the mission went catastrophically wrong, with four men captured, three killed, and Ryan left alone in the desert.

Reconstructions bring the story to life, as Ryan recounts how he made a 200-mile walk to safety, enduring days without food or water.