Polar Expedition arranged for the ship to sail by a huge iceberg called B15AB.Iceberg B15 was the largest recorded iceberg by area. It measured around 159 by 20 miles, about the size of Jamaica. Calved from the Ross Ice Shelf of Antarctica in March 2000, Iceberg B15 broke up into smaller icebergs, the largest of which was named Iceberg B15A. The pieces are named as the iceberg breaks up, and B15AB is the largest piece remaining.