One of the world's most extreme sporting events is underway in the Sahara desert - the Marathon des Sables.
More than a thousand competitiors will try to run the equivalent of six marathons over six days.
On the eve of the race start, participants have to go through the bag control to ensure that they have all the compulsory kit required by the organisation.
This includes a knife, a compass, a whistle, a lighter, anti-venom, an antiseptic, a sleeping bag, a survival blanket and a total of 12,000 food calories for the six days of races.
Andy Richardson reports.