Guardian: Scientists have discovered a frozen underworld beneath the ice sheet covering northern Greenland.
The previously unknown landscape, a vast expanse of warped shapes including some as tall as a Manhattan skyscraper, was found using ice-penetrating radar loaded aboard Nasa survey flights.
The findings and the first images of the frozen world more than a mile below the surface of the ice sheet are published on Sunday in the journal Nature Geoscience.
Scientists said the findings could deepen...