Britain's Prince Harry is preparing himself for a South Pole challenge by sleeping in a freezing cold chamber for 24 hours.
The 29-year-old royal and his British team-mates spent Monday in a weather simulator set at a temperature of -35 °C, practising putting up tents and hiking through blizzard winds, in a bid to make sure they're mentally ready for the Walking with the Wounded South Pole Allied Challenge in November.
A spokesman for the charity raising money for injured servicemen and women said, "The team will spend four hours a day making and breaking camp. It is important this activity is rehearsed to save time."
The British team will go head-to-head against a team from the US ? including actor Alexander Skarsgård ? in a 335-km trek from the 87° latitude line to the South Pole.
It’s thought the race will take 21 days to complete and each day the teams will endure 12 hours of skiing, with just 10-minute rest breaks every two hours.
During the expedition, the teams will have to pull sledges weighing 70 kg in bitterly cold temperatures as low as -45 °C, which is colder than a chamber is able to reach.
The prince, who’s a patron of Walking with the Wounded, announced he’d be joining the challenge in April, which is the most ambitious task undertaken by a member of the royal family before, and he’s been granted leave from the army to do so.