 Scientists aboard the RRS Sir David Attenborough on December 1, collected samples of seawater around the A23A mega-iceberg, the largest iceberg in the world, which is sailing away from the Antarctica a new footage released by the British Antarctic Survey shows the research ship navigating the edges of the enormous iceberg.at almost 4,000 square kilometers. The Antarctic iceberg called A23A is roughly three times the size of New York City, since calving off West Antarctica's Filchneuron ice shelf in. 1986, the iceberg which once hosted a Soviet research station has largely been stranded after its base became stuck on the floor of the Weddle Sea, not anymore. Recent satellite images reveal that the berg, weighing nearly a trillion metric tons, is now drifting quickly past the northern tip of the Antarctic peninsula, aided by strong winds and currents.