Mapping in the Kattegat was performed. The weather was in the beginning of the cruise dominated by strong northerly to north-easterly winds and by the end the winds shifted to south and decreased. The temperatures were slightly higher than normal for the season. The nutrient concentrations were lower than normal for the season for all areas. Hydrogen sulphide was observed below 150 m depth in the Fårö Deep (BY20). No hydrogen sulphide was observed in the Gotland Deep (BY15), however, the oxygen concentrations were still low (< 1 ml/l) below 125 m depth. No visible algea blooms were observed, except in the eastern Kattegat where a bloom is taking place.