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In October, 2011, NASA's Operation IceBridge discovered a major rift in the Pine Island Glacier in western Antarctica. This crack, which extends at least 18 miles and is 50 meters deep, could produce an iceberg more than 800 square kilometers in size. IceBridge scientists returned soon after to make the first-ever detailed airborne measurements of a major iceberg calving in progress. This video is public domain and can be downloaded at: ‪svs.gsfc.nasa.gov Like our videos? Subscribe to NASA's Goddard Shorts HD podcast: ‪svs.gsfc.nasa.gov Or find NASA Goddard Space Flight Center on facebook: ‪www.facebook.com Or find us on Twitter: ‪twitter.com