Surface water temperatures were normal in the whole area. Nutrient concentrations were normal in the whole investigated area, with the exception of phosphate that showed elevated levels in the Arkona Basin. The water below the halocline in the Arkona Basin showed values just above 2 ml/l. In the rest of the Baltic Proper oxygen concentrations below 2 ml/l were observed at depths exceeding 60 to 80 meters. Hydrogen sulphide was found, in the Western Gotland Basin, deeper than 70-80 meters. In the eastern Gotland Basin hydrogen sulphide began at depths between 100 and 125 meters.