Surface water temperatures as well as surface salinities were at normal levels for the season in the whole investigated area. Surface nutrient concentrations were mainly normal in most areas. Oxygen concentrations below 2 ml/l were found at depths exceeding 70-80 metres in the Baltic Proper, and at one station in the Arkona Basin. Hydrogen sulphide was present in the eastern– and western Gotland Basins as well as in the Bornholm Basin and the Hanö Bight. For the first time since the late 1980s SMHI also measured hydrogen sulphide at the station BCSIII-10 in the south-eastern part of the Baltic Proper.