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The peak of an iceberg made of blue ice at the Kongsfjorden glacier front in the Arctic Ocean near Ny-Alesund on Spitsbergen, Norway, 09 April 2015. Blue icebergs consist of very compact ice with no air pockets, where the light is broken so that they are blue. Since 2003, German and French researchers have been working in the research station AWIPEV in the former miner settlements on the Svalbard archipelago. The observation of the arctic stratosphere and investigations of the life in and around the Arctic Sea by oceanographers, ocean geologists, and arctic physics are scientific work fields of the Koldewey station. Photo: Jens Büttner | usage worldwide (KEYSTONE/DPA/Jens Büttner)