The world’s largest iceberg A23a, which has been at the ocean floor for over 30 years, is once again on the move. This iceberg is the size of an ice island, and currently, it is moving at a speed of 48 km per day. What is known about this iceberg, where it is heading, according to the Daily Mail. The iceberg, named A23a, broke away from the Antarctic coastline in 1986. It swiftly submerged to the bottom of the Weddell Sea, essentially becoming an ice island. Its area spans nearly 4,000 square kilometers, more than doubling the size of Greater London. Last month, it drifted at high speed, and n…