Oceanographic data have been obtained via an access hole made through Ronne Ice Shelf. The site, which is the third in a series of similar studies, lies 17 km west of Korff Ice Rise where 825 m of ice overlies a 485-m deep water column. Measurements included conductivity and temperature profiles, and an instrument mooring was deployed for long-term measurements of currents, temperature and conductivity. At the sea floor there was a 150-m layer of well-mixed water with a potential temperature and salinity of -1.97¿C and 34.72. The water cooled and freshed towards the ice-shelf base, ultimately reaching -2.41¿C and 34.51. The hydrographic and water current data imply a flow into the deepest part of the sub-ice shelf cavity of about 200,000 m3 s-1 of the deeper, relatively warm water, which would be able to power an average basal melt rate of 0.2 m a-1 for the western portion of Ronne Ice Shelf. ¿ American Geophysical Union