It is a world cut off from our own by thick blankets of floating ice, but some scientists are taking the plunge to learn how these frozen depths are changing.

A frozen lake consists of two kinds of ice ... Warmer winters are "creating thinner layers of black ice and sometimes a corresponding thicker layer of white ice," which can "make for treacherous ...

If you stab this frozen lake in the right place you can light it ... We call these frozen underground layers today, permafrost. But it's not permafrost that's the problem, it's rising global ...

The pilot and two children somehow managed to survive on the wing of a plane - even after spending a 'long, cold, dark, wet ...