Scientists on a NASA research plane in October 2018 took a photograph of a strange-looking iceberg floating in the Weddell Sea off Antarctica. It had a flat surface, vertical sides, pointed edges, and sharp corners. This kind of iceberg has a special name: tabular iceberg. The one in the NASA photo split off from the Larsen C ice shelf on the Antarctic Peninsula. Experts estimate it’s about a mile across. Most of it is hidden underwater.