In 2006 , an important encampment , WAIS Divide ( WSD ) was made on the divide between the Ross Sea Embayment and the Amundsen Sea Embayment . This was in easternmost Marie Byrd Land . In 2006 , a major encampment , WAIS Divide ( WSD ) was established on the divide between the Ross Sea Embayment and the Amundsen Sea Embayment , in easternmost Marie Byrd Land , in order to drill a high resolution ice core over the following three years .