The marine-grounded basins of East Antarctica hold many metres of sea level potential. Some of their outlet glaciers are exhibiting signs of thinning and retreat, and in one case, an ice shelf has collapsed. Projections of the region's future have reduced confidence due to uncertain boundary conditions, among other factors. The understanding of regional natural climate variability remains low, and uncertainty on basin ice-mass balance is high. Change in this basin will impact sea level, ocean circulation, and regional marine ecosystems. This session will focus on evidence from the past, observations from the present, and new projections to, together, advance our understanding of the East Antarctic Ice Sheet's future. The session expects to receive work presenting existing and newly collected data from regions of East Antarctica where the ice sheet is grounded below sea level. Topics of interest include holistic studies on processes regulating ice dynamics, like subglacial hydrology, ice sheet grounding, ice shelf melt, ice shelf cavity regime transition, water stratification and circulation, dense water production and sea ice change. Data and models aimed at reconstructing ice mass and subglacial topography changes as well as continental margin and ocean circulation at regional scale are also included in this session, as ice-ocean-bedrock interactions strongly depend on the evolution of the basin’s geological boundary conditions.