especially as revealed by sediments. Facilities The institute is distributed over several sites within North Germany and the Otto Schmidt Laboratory for Polar and Marine Research (OSL) at the Arctic and Antarctic Research Institute (AARI) in Saint Petersburg as Russian-German cooperation in the field of Arctic research, named after the polar explorer Otto Schmidt. Bremerhaven The headquarters was founded by Gotthilf Hempel. Nowadays, the AWI has several buildings within the city of Bremerhaven. Building D is located next to the old port (German: Alter Hafen). The dark clink-brick building was designed by Oswald Mathias Ungers in 1985 who won the architecture-award BDA-prize for the building. It hosts the AWI library, the main lecture hall and various laboratories and offices. The main building E is next to the lock Doppelschleuse. Main characteristics are the chequered tiles and the fact that there are three office towers. The building was designed by Otto Steidle and constructed in 2004 as an extension of the complex A,B,C. House F is close to the Weser ferry at the Geeste estuary. The housing association StäWoG (German: Städtische Wohnungsgesellschaft) renovated the building of the former nautical college (German: Hochschule für Seefahrt) in 1999. For this reason, there is a planetarium which is nowadays used by the Bremerhaven's friends of the stars. The small Bathymetry Building is located close to the radar tower. The Nordsee Villa formerly belonged to the fast-food restaurant chain Nordsee and hosts a few offices of AWI. Nowadays it is a Haus der Technik and part of the oldest German institute for technical further education with close cooperation to RWTH Aachen and other universities. The Harbour Warehouse (German: Hafenlager) is located within the Lloyd Werft, see Lloyd Werft Map. Potsdam The Forschungsstelle Potsdam is situated on the Telegrafenberg next to Potsdam. It belongs to AWI since 1992. The research focuses on the atmospheric physics and atmospheric chemistry of the atmosphere on the one hand and periglacial research on the other hand. Sylt The Wadden Sea Station Sylt is located on the North German island Sylt. It was founded in 1924 as an oyster laboratory to study the decline of oyster stocks and in order to study how they could be cultivated. In 1937, the name changed from oyster laboratory to Wadden Sea station. The station grew, and in 1949 the station was shifted from the northernmost edge of the island to the current location, next