Ever since a massive crack was discovered in Antarctica's Pine Island Glacier in 2011, NASA researchers and other scientists have kept a close watch on this area. The crack cleaved off an iceberg, now known as "Ice Island B31," which broke off from the glacier in November 2013, and has since been drifting across Pine Island Bay, a basin of the Amundsen Sea, toward the Southern Ocean.
Image: A close-up of the rift that opened up across the Pine Island Glacier in 2011. - NASA
