There is a Sailing Directions publication on Antarctica. Get it read it.
"... Commonwealth Bay (67˚01'S., 142˚40'E.), 27 miles wide, lies W of Cape Gray and recedes for about 12 miles. The E side of this bay is obstructed by many islets which lie up to 2 miles offshore
. The Hannam Islands lie about 2 miles offshore
, 7 miles W Cape Gray. Whetter Nunatak, a conspicuous rocky outcrop, juts through the ice cliffs, 3.5 miles S of these islands. The Laseron Islands, a small group, lie on the SE side of the bay. The Mackellar Islands lie in the center of the bay and about 1.5 miles from the head
. This group consists of about 30 rocks and small islands which extend over an area, about 2 miles long and 1 mile wide. The largest island in the group is about 0.5 mile long and is the site of a large penguin rookery. Several reefs
and shoals lie in the vicinity of these islands and they should be approached with care."
Note the words 'ice cliffs'.
PS I would LOVE to go and winter over - but man you need a piece of boat to do things there.