Abstract In their study, Young et al. (2025, https://doi.org/10.1029/2025GL115729 ) employ airborne radio‐echo sounding data to map the basal unit over the East Antarctic Ice Sheet over a large area between Dome A and South Pole. The authors use the results to infer conclusions about ice‐dynamic behavior of the ice sheet, geology, temporal development of subglacial geomorphology and physical properties of ice and the subsurface in this region. A comparative study has not been performed before. The results are of relevance for a number of disciplines and objectives, among them the quest for finding an ice‐core site to yield a record older than 1 million years, constraining the basal boundary conditions for ice‐flow modeling as well as determining subglacial geology to improve geothermal heat flow estimates. Plain Language Summary In their study, researchers used radar data collected from aircraft to create the first detailed map of the deepest hidden layer beneath a vast area of the East Antarctic Ice Sheet, stretching between Dome A and the South Pole. Their groundbreaking work reveals new insights into how the ice sheet moves and evolves, the shape and composition of the landscape buried beneath the ice, and the physical properties of both, the ice and the ground below. The results are valuable for a range of scientific goals, including the search for ice cores that could contain climate records older than 1 million years, improving the accuracy of ice flow models, and refining our understanding of the geothermal heat that influences the ice sheet's behavior. By connecting these discoveries, the study advances our knowledge of Earth's past and helps inform predictions about its future. Key Points Basal units near the base of ice sheets are underexplored features Young et al. (2025, https://doi.org/10.1029/2025GL115729 ) characterize a basal unit in East Antarctica using airborne radio‐echo sounding (radar) They infer unprecedented characteristics of ice, ice‐flow history, and geological composition