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A Swedish man who spent two months snowed inside his car as temperatures outside dropped to -30C is "awake and able to communicate", according to the hospital treating him, where stunned doctors believe he was kept alive by the "igloo effect" of his vehicle.
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Dr Ulf Segerberg, the chief medical officer at Noorland's University Hospital, said he had never seen a case like it. The man had probably been kept alive, he said, by the natural warming properties of his snowed-in car which would have acted as "the equivalent of an igloo".
"This man obviously had good clothes; he's had a sleeping bag and he's been in a car that's been snowed over," said Segerberg. "Igloos usually have a temperature of a couple of degrees below 0C and if you have good clothes you would survive in those temperatures and be able to preserve your body temperature. Obviously he has managed to preserve his body temperature or he wouldn't have made it because us humans can't really stand being cooled down like reptiles, for instance, which can change the body temperature."
Two months was at the "upper limit" of what a person would be able to survive without food, added Segerberg.
Skyllberg was found emaciated and very weak by a pair of snowmobilers who thought they had found a crashed car. They dug down through about a metre of snow to see its driver lying on the back seat in his sleeping bag, according to Ebbe Nyberg, a local police officer.
"They were amazed at what they found: a man in his mid-40s huddled inside in a sleeping bag, starving and barely able to move or speak," Nyberg, working in Vaesterbotten county, was quoted as saying.
A rescuer told the local newspaper Västerbottens-Kuriren: "It's just incredible that he's alive considering that he had no food, but also since it's been really cold for some time after Christmas."
Police said temperatures around Umeå had fallen to -30C. One doctor, Stefan Branth, said Skyllberg may have survived by going into hibernation mode. "A bit like a bear that hibernates. Humans can do that. He probably had a body temperature of around 31C which the body adjusted to. Due to the low temperature, not much energy was used up."
But Segerberg said he was "sceptical" of this suggestion. "We can't lower body temperature very much. A little bit we can, but if we lower body temperatures more than just a little bit, we lose consciousness and go into a coma," he said, cautioning that it was not his area of expertise.
Skyllberg is being treated in an ordinary ward in the University Hospital, where Segerberg said he was "feeling well". It was unclear how he had come to be stranded in the deserted lane.
Segerberg said that, even in a part of the world where sub-zero temperatures and heavy snow are the norm, this case was unusual. "There have been cases of people caught out in the mountains, and if they can dig themselves down in the snow they are able to survive and be found. But there must be something special in this case."