The nature of ice-sheet flow between Ridge B and the Vostok sub-ice lake will be determined from a series of measurements and numerical models. Datasets available foe measurements include airborne radar(for ice thickness, internal ice layering, crystal orientation fabric development, and sub-ice conditions), ERS-1 altimetry (for the ice-surface elevation) and interferometric SAR (for the ice-surface velocity). The measurements will form boundary conditions for state-of-the-art models of ice flow. Model results will establish the true nature of ice flow in this region of Antartica. Results will be fundamental to (1) the depth-chronology of the Vostok ice core (2) the examination of the ice-water interaction above the large Vostok subglacial lake and (3) developing traditional models of ice flow in central regions of ice sheets that currently do not replicate the true glaciology.