Behind the Lines

Training for 25 potential Royal Marines Mountain and Arctic Warfare Cadre begins.

Living off the land isn't as easy as it looks, so a bit of scavenging helps.

Five days into a survival course on the Hebrides, and still no food.

Death is just part of the job, so don't hesitate if the enemy comes into sight.

'Direct action' - break into a fort and plant high explosives on a radio mast.

The final stage of training - a 200 mile yomp through the snow - easy!

The trainees complete their recruitment course and discover if they have passed.