For years lobster and tuna fishermen knew about a unique spot in the ocean just off southern Australia. They also knew they were not the only ones reaping the riches of this treasure trove - with tales of huge whales luminescent in colour. A whale researcher decided to investigate. He has discovered that the Blue Whales, the biggest living animal, come here every summer to feed. There are only a few places in the world like this. Cold Antarctic water rises up from 400 metre depths as it nears the coast, bringing nutrients into the range of sunlight. This sparks off a chain of events leading to a feast. Then comes the biggest of them all - the Big Blue.