The Final Drift of Earth’s Oldest Iceberg After 40 years of drifting across the Southern Ocean, Iceberg A-23A is nearing its end — and turning a brilliant shade of blue. 🧊💙 Originally the size of a small country, A-23A broke off Antarctica’s Filchner Ice Shelf back in 1986. It stayed grounded for decades, but in 2023 it finally broke loose. Now, as it melts in warmer waters, it's shrinking fast and glowing cyan as meltwater pools deepen cracks in the dense, ancient ice. This color change is mo