A 34-year-old British hiker was revived in Spain after a six-hour cardiac arrest brought on by severe hypothermia, with the low temperatures that made her ill also helping to save her life.

Audrey Mash's ordeal began on Tuesday when she and her husband were hiking in the Catalan Pyrenees. As the weather took a turn for the worse, Mash, who lives in Barcelona, began experiencing trouble speaking and moving.

Mash then fell unconscious. Her husband, Rohan Schoeman, told Catalan broadcaster TV3 he thought she was dead. "I was trying to feel a pulse. ... I couldn't feel a breath, I couldn't feel a heartbeat," he said.