In Siberia, the winter temperature can drop to -60C, making it one of the coldest places to live in the world. In the first of our series on extremes, Adam Mynott finds out how the people of Oymyakon district cope with everyday life under such extraordinary conditions.
It was extremely cold.Stepping off the plane from Moscow into the brutal, brittle cold of Yakutsk in eastern Siberia, I could hardly believe that humans could survive, let alone thrive in such harsh conditions.
Yet this was a relatively mild start to my 10 days in the region. The temperature was -32C, and I was to encounter much worse.
One of the first things I noticed in Yakutsk, the regional capital of Sakha province, was that this city must be at severe risk of flooding, as all the buildings were built on concrete and steel stilts, suspending them 2m (6ft) above the ground.
But Valentin Spector, a senior researcher at the Permafrost Institute, said the stilts had nothing to do with flooding. He explained that in the summer, when temperatures can rise to more than 40C, the top layer of frozen ground warms and defrosts, in some places to a depth of a metre and in others to as much as three metres.
This "active layer," as Mr Spector called it, is very unstable, and unless the foundations of buildings are firmly rooted deep in the permafrost below, movement in the summer will bring them crashing down.
He told me that 65% of Russia sits on permafrost, and in some places in Siberia the frozen ground is 1500m deep.
'Shockingly painful'
The permafrost poses many other difficulties. Even though the summers are hot, it takes a long time for the topsoil to shake off the chill, and the growing season for farmers is shoe-horned into a small period of a few weeks.
The following day we flew to Ust-Nera, a town north of Yakutsk, inside the Arctic Circle and deep in the mountains.The air temperature fell another 10 degrees to around -42C, another startling shock to my life-support system.
As we drove into the town from the airport, we fell in behind a column of cars on their way to a funeral. Another problem posed by permafrost: how do people bury their dead in the middle of winter?
It takes two or three days to dig a grave in frozen ground.
A fire is lit and coals are piled on; after a couple of hours the coals are dragged to one side and the 15cm of ground defrosted by the heat and flames are dug and cleared. Hot coals are then pushed into the hole and the process begins all over again until the hole is 2m deep.
I was beginning to get used to the cold, but I still found it shockingly painful and difficult to operate in.
In the winter here, no-one goes outside unless they absolutely have to, and if they do have to venture out to shop or go to school or work, they are very well wrapped up.
Fur hats and long fur coats are everywhere.
A long fur coat can cost more than $1550 (£1000), beyond the purse of many people where the average wage is the equivalent of $600 (£400) a month. You can take out a mortgage on a fur coat - banks will lend to enable people to buy the garment they need.