This video is created from images acquired by the EU Copernicus Programme Sentinel-1 synthetic aperture radar (SAR), a satellite imaging system capable of acquiring data throughout the year regardless of cloud cover or lack of sunlight during the polar winter. The images were acquired every 6 days from 2016 until 2021, then every 12 days until October 2023, and are presented at a much speeded-up, but time-consistent frame rate. Thwaites Glacier is the size of Great Britain; only a fraction of its total area is shown in this frame which is 160 km (100 miles) wide. On the right hand side of the frame, the ice flows from right to left over bedrock, generating crevasses (bright linear features) which then move with the ice towards the ocean. On the left hand side, the glacier meets the Amundsen Sea and huge icebergs, several kilometers across, can be seen calving into the ocean and jostling together within the frozen sea surface. Some of these icebergs episodically topple over as they break away from the ice sheet revealing less reflective ice surfaces (dark patches, lower centre). The feature in the top left is what remains of the Thwaites Eastern Ice Shelf, a floating platform of ice which is gradually being torn apart by rifts reaching across the shelf.