Roland Piquepaille writes: "Ice has covered Greenland for millions of years. So what's hidden under this ice cap? Mountains and valleys? Rivers and lakes? Of course, we might know it sooner than we would have liked if the ice covering Greenland continues to melt. But researchers from Ohio State University have decided that they wanted to know it next year and have developed a radar to reveal views of land beneath polar ice. Their first tests of this new radar, which helps them to catch 3-D images of the ground under the ice, took place in May 2006. The next images will be shot in April 2007. Here are some images of the new GISMO device and what it can do."