Near the beginning of the new film “The Aeronauts,” a giant gas-filled balloon called the “Mammoth” departs from London’s Vauxhall Gardens and ascends into the clouds, revealing a bird’s eye view of London.

To some moviegoers, these breathtaking views might seem like nothing special: Modern air travel has made many of us take for granted what we can see from the sky. But during the 19th century, the vast “ocean of air” above our heads was a mystery.

A British woman suffering from severe hypothermia who was revived by doctors in Spain after more than six hours of cardiac arrest, on Thursday hailed her survival as "a miracle".

Audrey Marsh collapsed at around 1:00 pm on November 3 when she and her husband were caught in a snowstorm while out walking in the Pyrenees mountains.

But it was just over two-and-a-half hours before rescue teams were able to reach them, with the 34-year-old showing no signs of life nor cardiac activity, and a body temperature of just 18 degrees Celsius (64.4 degrees Fahrenheit).

Initial efforts to revive her at the scene had no effect and she was flown by helicopter to a Barcelona hospital equipped with an extracorporeal membrane oxygenation machine (ECMO).