This study investigates variations in the ice-flow speed of the Shirase Glacier ice tongue in East Antarctica from July 2018 to December 2021 using Sentinel-1 radar imagery. It identifies significant slowdown events linked to icebergs grounding on the seafloor, revealing that the ice tongue provides limited support to the grounding line, which has broader implications for understanding glacier dynamics and the potential consequences of ice loss in the context of climate change.