During the expedition, the weather was mainly calm and sunny. The surface water temperatures were between 14.8-18.9°C in the whole area. Oxygen concentrations below 2 ml/l were found at depths greater than 70m in the Bornholm Basin, at the Landsort and the Karlsö Deep, greater than 80 m in the eastern Gotland Basin and in the southeastern Baltic. Hydrogen sulphide was present from 140-150 m in the eastern Gotland Basin, from 80 m in the Bornholm Basin, from 70 m in the Hanö Bight and also in the bottom water of the Landsort and the Norrköping Deep (440 and 195m). In the surface water the nitrate concentrations were below the limit of detection and the phosphate concentrations were at the most stations about 0.05 μmol/l, somewhat higher in the Sound and the southern Baltic.