The first major ice-shelf calving in 25 years, in 2005, from the Ayles Ice Shelf in the Arctic, is slightly thicker than anticipated; Between 42-45m (138-148ft) - the equivalent of the height of a 10-storey building.
Scientists in the Arctic have just carried out the first research on a huge iceberg the size of Manhattan. Some 16km long and 5km wide (10x3 miles), Ayles Ice Island broke away from the Canadian Arctic coast in 2005, but has only recently been identified.
Researchers have now landed on the giant berg with a BBC team and planted a tracking beacon on its surface. This will allow the island's progress to be monitored as currents push it around the Arctic Ocean.