 Dr Petter Andreas Steen , professor at the National Hospital in Oslo , said it was " an extraordinary medical achievement " that Bågenholm 's life could be saved . He believed the reason she was able to recover was that her metabolism slowed down during the incident and the tissues inside her body required less oxygen at the low temperatures . According to the journal Proto ( published by the Massachusetts General Hospital ) , Bågenholm 's metabolism slowed down to ten percent of its baseline rate and thus she barely needed any oxygen at all . 
