
City-sized iceberg drifts into ocean —
In mid-October 2011, NASA scientists working in Antarctica discovered a massive crack across the Pine Island Glacier, a major ice stream that drains the West Antarctic Ice Sheet.

City-sized iceberg drifts into ocean —
The iceberg, named B31, separated from the Pine Island Glacier in November 2013.

City-sized iceberg drifts into ocean —
By December 2013, the iceberg had begun to move into Pine Island Bay.

City-sized iceberg drifts into ocean —
By February 2014, B31 was headed to the Amundsen Sea.

City-sized iceberg drifts into ocean —
By March 2014, the B31 iceberg was near an area where it could get swept up in the currents of the Southern Ocean, scientists say.

