On the sea ice in the Amundsen Sea. Photo: Anna Wåhlin

A top buoy is coming up again after spending two years at 300 meters depth. Photo: Anna Wåhlin

The anchors used to keep the moorings submerged – three railroad wheels connected by a chain. Photo: Anna Wåhlin

Povl Abrahamsen, British Antarctic Survey, with the rope connecting the top buoy and the anchor. Photo: Anna Wåhlin

Ice shelf in the Amundsen Sea. Photo: Anna Wåhlin