During the expedition the weather was rather cloudy and windy, especially during the first half part. Winds from the west were dominating. The surface water temperatures were between 15-16°C in the whole area with exception of a region with upwelling south Utklippan, where the temperature was only 7°C in the surface. Oxygen concentrations below 2 ml/l were found at depths greater than 70m in the Bornholm Basin, greater than 80m in the eastern Gotland Basin, greater than 90m in the Landsort Deep. Hydrogen sulphide was present from 150m in the eastern Gotland Basin and from 80m in the Bornholm Basin and in the Hanö Bight. In the surface water the nitrate concentrations were below the limit of detection and the phosphate concentrations were of the level 0.1-0.2 μmol/l.