 It also operates to and from the ice runway at the Sky Blu base.The smaller Twin Otters are equipped with skis for landing on snow and ice in remote areas, and operate out of the bases at Rothera, Fossil Bluff, Halley and Sky Blu.In January 2008, a team of British Antarctic Survey scientists, led by Hugh Corr and David Vaughan, reported that 2,200 years ago, a volcano erupted under Antarctica's ice sheet (based on airborne survey with radar images).