The Weddell Sea, in the South Atlantic Ocean, is renowned for its icy landscapes dominated by tabular icebergs. These ice formations, flat and wide, break off from continental glaciers or ice shelves, creating gigantic structures. Here major ice shelves produce icebergs that can reach impressive sizes, up to 150 ft/45 m in height and several hundred miles in length. Among the most notable is iceberg A23a, a colossal tabular iceberg that detached from the Filchner-Ronne Ice Shelf in 1986. After years of relative stability, in 2020, A23a began moving in the Weddell Sea. In 2023, it was observed near the Antarctic Peninsula before moving further north. Just before our arrival, it ran aground about 50 mi/90 km off the coast of South Georgia Island, marking the end of its drift of 2,000 mi/3,200 km. Once 1,500 sq mi/3,900 sq km in size, it has been steadily shrinking, shedding huge amounts of water as it moved into warmer seas. It is now an estimated 1,300 sq mi/3,400 sq km. We were hoping to get an opportunity to see A23a, but it was too far off our path for the Captain to entertain our request. And it would be nighttime when we were in that region.