Pieces of pancake ice float in the sea. The ice is made of young ice shaped by the swell in the sea which pushes the ice around and makes the pieces collide, rounding the pancake shapes. A thin ridge of ice, washed onto the pancakes forms around their perimeter. A team of scientists from Cambridge University were on board Greenpeace ship, Arctic Sunrise, using the latest in 3D technology to measure the thickness and volume of the rapidly retreating sea ice in the Arctic region.