The huge, long-lived iceberg known as B-22A has been anchored off the Antarctic coast for more than two decades. The movement of this immense ice block could affect the nearby Thwaites Glacier, one of the largest contributors to global sea level rise.
The block, located in the Amundsen Sea, got stuck on land in 2012 and has remained stationed in a relatively shallow part of the sea just 100 kilometers from its birthplace. It is uncommon, but not unheard of, for an iceberg to persist for so long.