An iceberg approximately twice as big as New York City is about break away from the Antarctic ice sheet due to the rapidly spreading cracks, which are being monitored by NASA. The Brunt ice shelf first witnessed a crack in 2016. The 'Halloween crack' is now accelerating at 2.5 miles a year, towards the North and will intersect with another fissure. This could lead to the loosening up of an iceberg of at least 660sq miles. This process is called calving and is predicted to happen within weeks. It would lead to a global rise in sea levels, posing a major risk to the coastal cities.