Most people who suffer cardiac arrest after prolonged submersion in icy water have little chance of survival. Yet in one of the most remarkable medical recoveries ever recorded, Anna Bågenholm, a Swedish radiologist, survived after becoming trapped beneath a frozen river in Norway for 80 minutes, during which her heart stopped beating for more than an hour.

In a groundbreaking medical case from 1999, Anna Bågenholm was trapped for 80 minutes beneath ice, with her heart stopping before an extraordinary rescue saw her return to work…

Most people who suffer cardiac arrest after prolonged submersion in icy water have little chance of survival. Yet in one of the most remarkable medical recoveries ever recorded,…