\" \" This NASA image compares the size of the Hiawatha Crater and Paris, France. The team claims it's the first meteorite impact crater that's ever been found under an ice sheet. In 2009, NASA kicked off Operation IceBridge, an ongoing survey of polar ice that's being conducted from the air. Kjær's team is confident that they have a genuine meteorite impact crater on their hands. Proponents of this idea have been looking for an extra-large, roughly 12,800 year-old meteorite crater.