Part way through the 6 - day 233 kilometre event a sandstorm caused Mauro Prosperi and his cousin James Duchkin to lose his way .
Prosperi , a keen endurance runner , took part in the 1994 Marathon des Sables ( Marathon of the Sands ) in Morocco .
Part way through the 6 - day 233 kilometre event a sandstorm caused endurance runner   and Prosperi 's cousin James Duchkin to lose his way .
Prosperi , a keen endurance runner , took part in the 1994 Marathon des Sables ( Marathon of the Sands ) in Morocco .