The British Antarctic Survey recently unveiled remarkable footage showing the mammoth iceberg, catalogued as A23a, heading to the Southern Ocean. The 'megaberg' measures in at 1,312 feet thick and a monstrous 1,540 square miles - twice the Size of Greater London. Images captured by the RRS Sir David Attenborough show the iceberg extending into the horizon beyond the research vessel. Originating from the Filchner Ice Shelf in 1986, A23a recently dislodged from the seabed on November 24, transitioning from the Weddell Sea into the Southern Ocean, likely heading toward 'iceberg alley' and potentially reaching the sub-Antarctic island of South Georgia. Researchers managed to collect samples which they hope will aid in their understanding of Southern Ocean climate change's impact on local organisms.