Impact crater found under Greenland ice

What could be a large meteorite impact crater has been discovered beneath the Greenland ice sheet. If confirmed, it would be the first ever located below a continental ice sheet

ARCTIC OCEAN
Detail map
GREENLAND (Denmark)
Nuuk
500km 300 miles
ATLANTIC OCEAN
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Nares Strait
Hiawatha crater
Greenland Ice Sheet
Investigations suggest feature – found under Hiawatha Glacier – was probably dug out by 1.5km- wide iron asteroid between about 12,000 and three million years ago
Ancient drainage channels
30km 19 miles
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Ice thickness radar antennas
Alfred Wegener Institute’s Polar 6 aircraft provided high-resolution scans
31km
Depression depth: 300 metres
At 31km wide, it is larger than Washington DC and would rank among world’s top 25 known craters
Depression covered by up to 1km of ice
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Pictures: NASA/Jefferson Beck, Nasa/Cryospheric Sciences Lab/Natural History Museum of 

Denmark Sources: Science Advances, NASA’s Goddard Space Flight Center © GRAPHIC NEWS