From ESA astronaut André Kuiper’s weblog:
The six of us on the Space Station live quite isolated from the world. But we are not the only people in such a situation. Before my mission started I asked if I could be in contact with two other missions. One on the bottom of the sea and one on the South Pole. I had very special conversations with people that are in similar situations or even more isolated.
The first contact I had was with the people on the science base Concordia on the South Pole. They probably have a tougher time than we do up here. It is extremely cold at -80 degrees Celsius and when it is summer in The Netherlands they live in permanent darkness. The crew cannot leave, as the fuel in their vehicles is frozen and aircraft cannot reach them. Compared to their experience I think a space mission is quite varied.