Underwater Robot Reveals ‘Enigmatic’ Shapes on the Bottom of Antarctic Ice

By sending sound waves into the warming seas around Antarctica, an underwater robot has given scientists a detailed new look at the melting undersides of the continent’s giant ice shelves, which matter hugely for global sea levels.The images taken by the robot contain clues about how the shelves are thinning. They reveal several never-before-seen formations in the ice, including immense terraces with rounded,…