Scientists say they have seen a remarkable collection of blue whales in the coastal waters around the UK sub-Antarctic island of South Georgia. Their 23-day survey counted 55 animals - a total that is unprecedented in the decades since commercial whaling ended. To witness 55 of them now return to what was once a pre-eminent feeding ground for the population has been described as truly, truly amazing" by cetacean specialist Dr Trevor Branch. "To think that in a period of 40 or 50 years, I only had records for two sightings of blue whales around South Georgia. So to go from basically nothing to 55 in one year is astonishing," he told BBC News. Blue whales are the most massive creatures ever to roam the Earth, and the Antarctic sub-species contained the very biggest of the big at over 30m. This population was also the most numerous of the 10 or so discrete populations across the globe, carrying perhaps 239,000 individuals prior to the onset of industrial exploitation. But the marine mammals' physical size made them a profitable catch, and around South Georgia more than 33,000 Antarctic blues were documented to have been caught and butchered, most of them between 1904 and 1925. By the time a ban was introduced in 1966, a sighting anywhere in Southern Ocean waters would have been extremely rare indeed. The last official estimate of abundance was made in 1997 and suggested Antarctic blues could have recovered to about 2,280 individuals.