Abstract
During the autumn of 1966 soundings were taken around Pram Point, following the most extensive ice breakout since the establishment of Scott Base in 1957. The soundings showed that the Scott Base lava flow does not extend beneath the sea of McMurdo Sound, and that the pressure ridges formed on the sea ice and the pressure rollers formed on the McMurdo Ice Shelf are solely due to a thinning, slowing, westward moving ice sheet abutting against the Hut Point Peninsula.
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