Icebergs start as ice sheets attached to the land or a glacier. They are large monsters of solid ice but they do break off the ice sheet before they float out to sea. How do they break up afterwards at sea? An international team of scientists has discovered a previously unknown mechanism by which large tabular icebergs break up out at sea as part of a study carried out on the Peterman Iceberg in Baffin Bay over the summer. Scientists observed that the gradual creation of a huge underwater ice foot produced so much buoyancy that it broke large chunks off the main iceberg thus causing the iceberg to slowly disintegrate. This discovery was captured on camera as a film crew followed the expedition for Operation Iceberg.