AbstractEight submarine ice cliffs have been observed on the west side of McMurdo Sound. Three of these cliffs (Miers Valley, Cape Chocolate, and Strand Moraines) are associated with known ice-cored moraines and are justifiably regarded as underwater exposures of ice cores in the adjacent coast. The ice cliffs at Explorers Cove and near Herbertson Glacier may also be underwater exposures of ice cores which may be present in adjacent moraines. Some of these ice cliffs may represent unusual submarine accretionary sea-ice structures.