https://www.inverse.com/article/53248-second-greenland-impact-crater-discovery
NASA: Video Shows Discovery of Second Crater Under Greenland's Melting Ice
Feb 12, 2019 - "Imagine 12 billion tons of iron coming down."
video showsdiscovery ofsecond crater
https://www.space.com/second-possible-crater-impact-beneath-greenland.html
NASA Spots a Second Massive Possible Impact Crater Buried Under Greenland Ice | Space
Feb 12, 2019 - NASA scientists have spotted a second possible giant impact crater hidden deep below Greenland's ice.