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Kevin Fong follows the story of Anna Bagenholm, whose story has fascinated medics across the world for the last 11 years.

After a skiing accident where she became wedged under thick ice her body temperature dropped to 13.74 ËšC and her heart stopped. By the time she arrived at hospital her heart had been still for over three hours.

But the very thing that should have killed Anna saved her – the freezing temperatures of the mountains prevented her brain cells from dying and after pioneering surgery she was able to make a full recovery.