A 20-mile (33 kilometer) by 12 mile (20 kilometer) iceberg, which broke off from the Pine Island glacier in Antarctica, may pose a threat to modern ships.

Above: Iceberg B31 escapes into the southern ocean on March 11, 2014. Credit: Jeff Schmaltz, LANCE/EOSDIS Rapid Response

The iceberg, named B31, is currently being monitored by British Antarctic Survey airplanes and NASA satellites but could be difficult to track in darkness of the polar winter. More icebergs of varying sizes are expected to break away in the near future, which are expected to become a growing threat to polar shipping.

Read more at Discovery.