Icebergs occur all year in the Southern Ocean off Antarctica, including table- shaped icebergs, made by calving from the large ice shelves, which flow from the continent onto the ocean. They can be huge – the B-15 iceberg by the Ross Ice Shelf near Eastern Antarctica was some 11,000 km2. In 2000, parts of B-15 broke loose, drifting off for several years. Particularly the B-15A, which NASA scientists observed for years via satellite images, was famous. En route, the iceberg cut off penguins’ access to food in open sea several times, so for two years, they were forced to migrate 180 km for food. In 2005, the iceberg disintegrated.