The West Antarctic Ice Sheet is currently undergoing rapid change, in particular over the Amundsen Sea Emabayment (ASE) region, and this may lead to accelerated future sea-level rise. Previous aerogeophysical investigations over the Siple Coast reveal that the geology of the West Antarctic Rift System may strongly modulate the dynamics of fast-flowing glaciers that drain the West Antarctic Ice Sheet. But what are the interplays between the virtually unknown sub-ice geology and the apparently thinning and retreating ASE glaciers, such as Pine Island Glacier and Thwaites Glacier? We will utilise new airborne geophysical data collected by UK, US and German teams over the ASE region to provide a unique window on the lithospheric cradle for the West Antarctic Ice Sheet and to study the geodynamics of the largest glaciated rift system on Earth.